chore: naikkan versi ke 1.0.13+20

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.fvmrc

@@ -0,0 +1,3 @@
+{
+  "flutter": "3.41.9"
+}

.gitignore

@@ -32,6 +32,7 @@ migrate_working_dir/
 .pub-cache/
 .pub/
 /build/
+android/build/
 
 # Symbolication related
 app.*.symbols
@@ -43,3 +44,8 @@ app.*.map.json
 /android/app/debug
 /android/app/profile
 /android/app/release
+
+# FVM - versi Flutter dipin di .fvmrc (ikut di-commit), SDK-nya tidak
+
+# FVM Version Cache
+.fvm/

.vscode/launch.json

@@ -0,0 +1,17 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Dev",
+      "request": "launch",
+      "type": "dart",
+      "args": ["--dart-define=ENV=dev"]
+    },
+    {
+      "name": "Prod",
+      "request": "launch",
+      "type": "dart",
+      "args": ["--dart-define=ENV=prod"]
+    }
+  ]
+}

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+  "dart.flutterSdkPath": ".fvm/versions/3.41.9"
+}

README.md

@@ -1,16 +1,331 @@
-# apskel_pos_flutter_v2
+# Apskel POS Flutter
 
-A new Flutter project.
+Aplikasi Point of Sale (POS) berbasis Flutter untuk manajemen kasir restoran. Mendukung manajemen order, produk, meja, pelanggan, pembayaran, printer bluetooth/network, analitik, dan push notification via FCM.
 
-## Getting Started
+---
 
-This project is a starting point for a Flutter application.
+## Fitur Utama
 
-A few resources to get you started if this is your first Flutter project:
+- **Autentikasi** — Login dengan email & password, logout, session management
+- **Order Management** — Buat, kelola, dan proses order
+- **Produk & Kategori** — Manajemen menu dan kategori produk
+- **Meja** — Manajemen meja restoran
+- **Pelanggan** — Data pelanggan dan riwayat transaksi
+- **Checkout & Pembayaran** — Proses checkout dengan berbagai metode pembayaran
+- **Split Bill** — Pembagian tagihan
+- **Void & Refund** — Pembatalan dan pengembalian transaksi
+- **Printer** — Cetak struk via Bluetooth dan Network printer
+- **Analitik** — Dashboard, laporan penjualan, produk, kategori, payment method, profit/loss, inventory
+- **Sinkronisasi** — Sinkronisasi data offline/online
+- **Push Notification (FCM)** — Notifikasi real-time via Firebase Cloud Messaging
 
-- [Lab: Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
-- [Cookbook: Useful Flutter samples](https://docs.flutter.dev/cookbook)
+---
 
-For help getting started with Flutter development, view the
-[online documentation](https://docs.flutter.dev/), which offers tutorials,
-samples, guidance on mobile development, and a full API reference.
+## Tech Stack
+
+| Kategori             | Library                                                       |
+| -------------------- | ------------------------------------------------------------- |
+| Version Manager      | `fvm` — Flutter dipin di `.fvmrc`                             |
+| State Management     | `flutter_bloc` + `bloc`                                       |
+| Dependency Injection | `get_it` + `injectable`                                       |
+| Navigation           | `auto_route`                                                  |
+| HTTP Client          | `dio`                                                         |
+| Local Database       | `sqflite`                                                     |
+| Local Storage        | `shared_preferences`                                          |
+| Firebase             | `firebase_core`, `firebase_crashlytics`, `firebase_messaging` |
+| Push Notification    | `flutter_local_notifications`                                 |
+| Device Info          | `device_info_plus`, `package_info_plus`                       |
+| Code Generation      | `freezed`, `json_serializable`                                |
+| Printer              | `print_bluetooth_thermal`, `flutter_esc_pos_network`          |
+| Chart                | `fl_chart`                                                    |
+| Connectivity         | `connectivity_plus`                                           |
+
+---
+
+## Arsitektur
+
+Project menggunakan **Clean Architecture** dengan 4 layer:
+
+```
+lib/
+├── application/        # BLoC — state management per fitur
+├── domain/             # Entity, repository interface, failure
+├── infrastructure/     # Implementasi repository, DTO, datasource
+├── presentation/       # UI — pages, components, router
+└── common/             # Shared utilities, DI modules, service, theme
+```
+
+### Struktur per Fitur
+
+```
+feature/
+├── application/
+│   └── feature_bloc.dart         # BLoC
+├── domain/
+│   ├── entities/                 # Domain model (freezed)
+│   ├── repositories/             # Interface repository
+│   └── failures/                 # Failure types
+└── infrastructure/
+    ├── datasources/
+    │   ├── remote_data_provider.dart
+    │   └── local_data_provider.dart
+    ├── dtos/                     # Data Transfer Object (json_serializable)
+    └── repositories/             # Implementasi repository
+```
+
+---
+
+## Setup & Menjalankan
+
+### Prasyarat
+
+- **FVM** — project ini mengunci versi Flutter, jangan pakai Flutter global
+- **Flutter 3.41.9** (Dart 3.11.5) — dipin di `.fvmrc`
+- Android SDK / Xcode (untuk iOS)
+- Firebase project yang sudah dikonfigurasi
+
+> **Kenapa versinya dikunci?** Stack code generation project ini (`freezed` 2.x, `build_runner` 2.5, `analyzer` 7.7.1) hanya paham bahasa Dart sampai 3.9. Flutter 3.44 ke atas membawa framework yang ditulis di bahasa 3.10+, dan `analyzer` 7.7.1 crash saat membacanya. Selama stack codegen belum dinaikkan, **Flutter 3.41.9 adalah versi terbaru yang masih bisa menjalankan `build_runner`.** Lihat [Troubleshooting](#troubleshooting).
+
+### Instalasi
+
+```bash
+# Clone repository
+git clone <repo-url>
+cd apskel-pos-flutter-v2
+
+# Pasang FVM (sekali per mesin)
+dart pub global activate fvm
+
+# Ambil & pakai versi Flutter yang dipin di .fvmrc
+fvm install
+fvm use
+```
+
+`dart pub global activate` memasang `fvm` ke folder bin milik pub yang **belum tentu ada di PATH**. Kalau muncul `fvm: command not found` / `The term 'fvm' is not recognized`, tambahkan foldernya sekali saja:
+
+```powershell
+# Windows PowerShell — permanen, buka terminal baru setelahnya
+[Environment]::SetEnvironmentVariable('Path', [Environment]::GetEnvironmentVariable('Path','User') + ";$env:LOCALAPPDATA\Pub\Cache\bin", 'User')
+
+# Untuk terminal yang sedang terbuka
+$env:Path += ";$env:LOCALAPPDATA\Pub\Cache\bin"
+```
+
+```bash
+# macOS / Linux — tambahkan ke ~/.zshrc atau ~/.bashrc
+export PATH="$PATH:$HOME/.pub-cache/bin"
+```
+
+Setelah `fvm` bisa dipanggil, lanjutkan:
+
+```bash
+# Install dependencies
+fvm flutter pub get
+
+# Generate kode
+fvm dart run build_runner build
+```
+
+> Semua perintah Flutter/Dart di project ini **harus diawali `fvm`**. `flutter run` tanpa `fvm` memakai Flutter global dan hasilnya bisa berbeda.
+
+### Menjalankan App
+
+Environment **tidak** ditentukan otomatis dari debug/release — harus dioper lewat `--dart-define`:
+
+```bash
+# Development
+fvm flutter run --dart-define=ENV=dev
+
+# Production
+fvm flutter run --dart-define=ENV=prod
+
+# Production, release mode
+fvm flutter run --release --dart-define=ENV=prod
+```
+
+Kalau `ENV` tidak dioper, nilainya jatuh ke `dev` (lihat `defaultValue` di `lib/main.dart`).
+
+Di VSCode sudah tersedia konfigurasi **Dev** dan **Prod** di `.vscode/launch.json`, tinggal pilih di panel Run and Debug.
+
+### Build
+
+`--dart-define=ENV=prod` wajib ikut, kalau tidak APK-nya akan memakai database dan base URL milik dev:
+
+```bash
+# APK
+fvm flutter build apk --release --dart-define=ENV=prod
+
+fvm flutter build apk --release --split-per-abi --dart-define=ENV=prod
+
+# App Bundle (Play Store)
+fvm flutter build appbundle --release --dart-define=ENV=prod
+
+# iOS
+fvm flutter build ipa --release --dart-define=ENV=prod
+```
+
+---
+
+## Code Generation
+
+Project ini banyak memakai kode generated (`freezed`, `injectable`, `auto_route`, `json_serializable`, `flutter_gen`). Kode itu **wajib di-generate ulang** setiap kali kamu:
+
+- menambah/mengubah kelas `@freezed` (entity, event, state, DTO)
+- menambah/mengubah anotasi DI (`@injectable`, `@LazySingleton`, `@Injectable(as: ...)`)
+- menambah halaman baru dengan `@RoutePage()`
+- menambah aset di `pubspec.yaml`
+
+```bash
+# Sekali jalan
+fvm dart run build_runner build
+
+# Mode watch — regenerate otomatis saat file berubah, enak dipakai saat ngoding
+fvm dart run build_runner watch
+```
+
+> **Hindari `--delete-conflicting-outputs`.** Flag itu menghapus seluruh file generated **sebelum** mulai build. Kalau build-nya gagal di tengah jalan, kamu berakhir tanpa kode generated sama sekali dan project tidak bisa di-compile. Pakai hanya kalau build_runner benar-benar mengeluh soal konflik output, dan pastikan working tree-mu bersih dulu supaya bisa `git restore`.
+
+---
+
+## Environment
+
+Konfigurasi environment ada di `lib/env.dart` — **itu sumber kebenarannya**, jangan disalin ke sini karena gampang basi.
+
+| Environment | Database                |
+| ----------- | ----------------------- |
+| `dev`       | `apskel_pos_staging.db` |
+| `prod`      | `apskel_pos_prod.db`    |
+
+Environment dipilih dari `--dart-define=ENV=...` di `lib/main.dart`:
+
+```dart
+const String env = String.fromEnvironment('ENV', defaultValue: 'dev');
+await configureDependencies(env);
+```
+
+Nilai `env` diteruskan ke `injectable`, yang lalu memilih antara `DevEnv` (`@dev`) dan `ProdEnv` (`@prod`). Menambah environment baru berarti menambah kelas ber-anotasi di `lib/env.dart`, lalu generate ulang.
+
+Karena `dev` dan `prod` memakai **nama database berbeda**, berpindah environment di perangkat yang sama tidak akan mencampur datanya.
+
+---
+
+## Dependency Injection
+
+DI menggunakan `get_it` + `injectable`. Semua service, repository, dan BLoC didaftarkan via annotation.
+
+### Modul DI
+
+| File                         | Isi                                                                                       |
+| ---------------------------- | ----------------------------------------------------------------------------------------- |
+| `di_firebase.dart`           | `FirebaseMessaging`, `FlutterLocalNotificationsPlugin`, `DeviceInfoPlugin`, `PackageInfo` |
+| `di_dio.dart`                | `Dio` HTTP client                                                                         |
+| `di_shared_preferences.dart` | `SharedPreferences`                                                                       |
+| `di_database.dart`           | `DatabaseHelper` (SQLite)                                                                 |
+| `di_auto_route.dart`         | `AppRouter`                                                                               |
+| `di_connectivity.dart`       | `Connectivity`                                                                            |
+
+Setelah menambah atau mengubah class yang menggunakan annotation injectable, jalankan:
+
+```bash
+dart run build_runner build --delete-conflicting-outputs
+```
+
+---
+
+## Firebase & FCM
+
+### Setup
+
+Firebase sudah dikonfigurasi di `android/app/google-services.json`. Inisialisasi dilakukan di `main.dart` sebelum app berjalan.
+
+### FCM Service
+
+`FcmService` (`lib/common/service/fcm_service.dart`) menangani:
+
+- Request permission notifikasi (Android 13+ / iOS)
+- Ambil dan log FCM token
+- Foreground notification via `flutter_local_notifications`
+- Background & terminated message handler
+- Subscribe/unsubscribe topic
+
+FCM token dikirim ke server saat login bersama device info.
+
+### Login Payload
+
+Saat login, app mengirim data berikut ke API:
+
+```json
+{
+  "email": "user@example.com",
+  "password": "secret",
+  "fcm_token": "dXj3k9...",
+  "device_id": "abc123",
+  "device_name": "Samsung Galaxy Tab S8",
+  "device_type": "tablet",
+  "platform": "android",
+  "app_version": "1.0.4+9",
+  "os_version": "Android 13 (SDK 33)"
+}
+```
+
+Nilai valid: `device_type` → `mobile | tablet | desktop`, `platform` → `android | ios | web`
+
+---
+
+## Printer
+
+Mendukung dua jenis printer:
+
+- **Bluetooth** — via `print_bluetooth_thermal`
+- **Network (LAN)** — via `flutter_esc_pos_network`
+
+---
+
+## Orientasi Layar
+
+App dikunci ke mode **landscape** (kiri & kanan) karena didesain untuk tablet POS.
+
+---
+
+## Catatan Development
+
+- Selalu pakai `fvm flutter` / `fvm dart`, bukan `flutter` / `dart` global
+- Jangan edit `injection.config.dart` dan file `*.freezed.dart` / `*.g.dart` secara manual — file tersebut di-generate otomatis
+- Setelah mengubah kelas `@freezed` atau anotasi DI, jalankan build_runner sebelum menjalankan app
+- Gunakan `log()` dari `dart:developer` untuk logging, bukan `print()`
+- `print()` dinonaktifkan di release mode
+
+---
+
+## Troubleshooting
+
+### `build_runner` gagal: `Missing implementation of visitDotShorthandPropertyAccess`
+
+Kamu sedang memakai Flutter yang terlalu baru. Cek:
+
+```bash
+fvm flutter --version   # harus 3.41.9
+flutter --version       # ini Flutter global, boleh versi apa saja
+```
+
+Kalau versinya bukan 3.41.9, artinya perintahnya jalan tanpa `fvm`. Log build juga memberi petunjuk yang sama:
+
+```
+SDK language version 3.13.0 is newer than `analyzer` language version 3.9.0
+```
+
+Perbaikannya: `fvm use`, lalu ulangi dengan awalan `fvm`.
+
+Menaikkan Flutter melewati 3.41.x mengharuskan seluruh stack codegen ikut naik — `freezed` 2 → 3/4, `build_runner` → 2.16, `injectable_generator` 2 → 3, `auto_route` 9 → 10. `freezed` 3 mewajibkan tiap kelas dideklarasikan `abstract`/`sealed` dan menghapus `when`/`map` (diganti pattern matching), jadi ini pekerjaan tersendiri, bukan sambilan.
+
+### Project tidak bisa di-compile, banyak error `_$Something` tidak ditemukan
+
+Kode generated-nya hilang atau belum dibuat. Jalankan:
+
+```bash
+fvm dart run build_runner build
+```
+
+### `fvm: command not found`
+
+FVM terpasang di `~/AppData/Local/Pub/Cache/bin` (Windows) atau `~/.pub-cache/bin` (macOS/Linux) yang mungkin belum ada di `PATH`. Tambahkan direktori itu ke `PATH`, atau panggil dengan path lengkap.

analysis_options.yaml

@@ -4,6 +4,9 @@ linter:
   rules:
     sort_pub_dependencies: false
     prefer_relative_imports: true
+    prefer_const_constructors: true
+    prefer_const_literals_to_create_immutables: true
+    prefer_const_declarations: true
 
 analyzer:
   errors:
@@ -18,3 +21,10 @@ analyzer:
     - test/generated/**
     - "**/**.g.dart"
     - "**/**.freezed.dart"
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**

android/app/build.gradle.kts

@@ -14,6 +14,7 @@ android {
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_11
         targetCompatibility = JavaVersion.VERSION_11
+        isCoreLibraryDesugaringEnabled = true
     }
 
     kotlinOptions {
@@ -45,6 +46,8 @@ flutter {
 }
 
 dependencies {
+    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.1.4")
+
     // Import the Firebase BoM
     implementation(platform("com.google.firebase:firebase-bom:34.4.0"))
 

android/app/src/main/AndroidManifest.xml

@@ -10,6 +10,8 @@
     <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>
     <!-- Izin khusus untuk akses foto (media images) di Android 33 ke atas -->
     <uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />
+    <!-- Izin notifikasi untuk Android 13+ -->
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     <application
         android:label="Apskel POS"
         android:name="${applicationName}"
@@ -41,6 +43,13 @@
         <meta-data
             android:name="flutterEmbedding"
             android:value="2" />
+        <!-- FCM: default notification icon dan channel -->
+        <meta-data
+            android:name="com.google.firebase.messaging.default_notification_icon"
+            android:resource="@drawable/ic_notification" />
+        <meta-data
+            android:name="com.google.firebase.messaging.default_notification_channel_id"
+            android:value="high_importance_channel" />
     </application>
     <!-- Required to query activities that can process text, see:
          https://developer.android.com/training/package-visibility and

android/gradle.properties

@@ -1,3 +1,7 @@
 org.gradle.jvmargs=-Xmx8G -XX:MaxMetaspaceSize=4G -XX:ReservedCodeCacheSize=512m -XX:+HeapDumpOnOutOfMemoryError
 android.useAndroidX=true
 android.enableJetifier=true
+# This builtInKotlin flag was added automatically by Flutter migrator
+android.builtInKotlin=false
+# This newDsl flag was added automatically by Flutter migrator
+android.newDsl=false

android/gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.12-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.3-all.zip

android/settings.gradle.kts

@@ -18,8 +18,8 @@ pluginManagement {
 
 plugins {
     id("dev.flutter.flutter-plugin-loader") version "1.0.0"
-    id("com.android.application") version "8.7.3" apply false
-    id("org.jetbrains.kotlin.android") version "2.1.0" apply false
+    id("com.android.application") version "8.11.1" apply false
+    id("org.jetbrains.kotlin.android") version "2.2.20" apply false
     id("com.google.gms.google-services") version "4.4.4" apply false
 }
 

devtools_options.yaml

@@ -0,0 +1,3 @@
+description: This file stores settings for Dart & Flutter DevTools.
+documentation: https://docs.flutter.dev/tools/devtools/extensions#configure-extension-enablement-states
+extensions:

docs/integration-weight-based-products.md

@@ -0,0 +1,279 @@
+# Integrasi Produk Timbangan — POS Mobile & Backoffice
+
+**Migrasi:** `000089` · **Base URL:** `/api/v1` · **Kompatibilitas:** mundur penuh
+
+Panduan untuk menjual produk per timbangan (ikan, daging, buah) dari sisi klien.
+Alasan di balik setiap keputusan desain ada di [`rfc-weight-based-products.md`](./rfc-weight-based-products.md).
+
+---
+
+## 1. Konsep inti
+
+**Satu penimbangan = satu baris order.**
+
+Pelanggan memesan Ikan Tude 4,2 ons, lalu memesan Ikan Tude lagi 5,6 ons. Itu **dua
+baris terpisah**, karena keduanya dua ikan berbeda yang ditimbang sendiri-sendiri.
+
+| Bukan begini | Melainkan begini |
+|---|---|
+| `quantity: 9.8` | `quantity: 1, weight: 4.2`<br>`quantity: 1, weight: 5.6` |
+| Dua ikan hilang jejaknya, dan `quantity` bertipe integer sehingga pecahan ditolak | Tiap penimbangan berdiri sendiri, bisa di-void atau dibayar terpisah |
+
+Empat aturan yang berlaku di seluruh dokumen ini:
+
+1. `quantity` untuk produk timbangan **selalu 1**. Backend memaksanya, dan database
+   menolak nilai lain lewat constraint `chk_order_items_weight_single_line`.
+2. `weight` menyimpan angka timbangan, dalam satuan produk itu sendiri (ons, kg, gram —
+   apa pun yang dipilih saat setup).
+3. Harga baris dihitung `weight × unit_price`, bukan `quantity × unit_price`.
+   `unit_price` tetap berarti harga per satu satuan (per ons).
+4. **Jangan pernah menggabungkan dua baris** produk timbangan menjadi satu, meski
+   produknya sama.
+
+Untuk produk biasa tidak ada yang berubah: `weight` tidak dikirim, `quantity` tetap
+cacah seperti sekarang.
+
+---
+
+## 2. Backoffice — setup produk
+
+### 2.1 Pastikan satuannya ada
+
+Satuan disimpan per organisasi. Buat sekali, pakai ulang untuk semua produk timbangan.
+
+`POST /api/v1/units`
+
+```json
+{
+  "name": "Ons",
+  "abbreviation": "ons",
+  "is_active": true
+}
+```
+
+`abbreviation` yang dipakai POS untuk mencetak `4,2 ons` di struk — isi dengan bentuk
+pendek yang benar-benar ingin ditampilkan. Daftar satuan dibaca lewat `GET /api/v1/units`.
+
+### 2.2 Buat produk sebagai produk timbangan
+
+`POST /api/v1/products`
+
+```json
+{
+  "category_id": "…",
+  "name": "Ikan Tude",
+  "price": 4500,
+  "cost": 3000,
+  "sell_by": "weight",
+  "unit_id": "<id satuan Ons>"
+}
+```
+
+| Field | Tipe | Keterangan |
+|---|---|---|
+| `sell_by` | `"unit"` \| `"weight"` | Opsional, default `"unit"`. Nilai lain **ditolak** dengan pesan jelas. |
+| `unit_id` | UUID | **Wajib** saat `sell_by: "weight"`, ditolak backend bila kosong. Opsional untuk produk satuan. |
+| `price` | number | Harga per satu satuan. Rp 4.500 per ons, bukan harga per ikan. |
+
+Pada `PUT /api/v1/products/:id`, `unit_id` **tidak perlu dikirim ulang** bila produknya
+sudah punya satuan — mengubah `sell_by` menjadi `"weight"` saja sudah cukup. Yang ditolak
+adalah kondisi akhirnya: produk yang dijual per timbangan tanpa satuan.
+
+Keduanya juga bisa diubah lewat `PUT /api/v1/products/:id` dengan bentuk yang sama, dan
+ikut terbaca di setiap response produk (`GET /api/v1/products`, `/products/all`,
+`/products/:id`).
+
+### 2.3 Catatan UI
+
+- Kunci `sell_by` **setelah produk punya transaksi**. Mengubah produk lama dari `unit`
+  ke `weight` tidak mengubah baris order yang sudah ada — baris lama tetap dihitung per
+  cacah — tapi akan membingungkan pengguna yang melihat riwayatnya.
+- Saat `weight` dipilih, jadikan pemilih satuan sebagai field **wajib** di form. Backend
+  juga menolaknya, tapi ditangkap di form lebih baik daripada baru gagal saat simpan.
+- Ubah label harga mengikuti satuan yang dipilih: *"Harga per ons"*.
+- Untuk produk satuan, pemilih satuan boleh disembunyikan — `unit_id` opsional dan belum
+  dikonsumsi apa pun di POS.
+
+---
+
+## 3. POS Mobile — transaksi
+
+### 3.1 Bentuk input mengikuti `sell_by`
+
+| `sell_by` | Input di POS | Yang dikirim |
+|---|---|---|
+| `"unit"` | Stepper − / + seperti sekarang | `quantity: n`, tanpa `weight` |
+| `"weight"` | Papan angka desimal, satuan dari `unit` produk | `quantity: 1` + `weight: 4.2` |
+
+### 3.2 Mengirim order
+
+`POST /api/v1/orders`
+
+```json
+{
+  "outlet_id": "…",
+  "user_id": "…",
+  "order_type": "dine_in",
+  "order_items": [
+    { "product_id": "<ikan-tude>",  "quantity": 1, "weight": 4.2 },
+    { "product_id": "<ikan-tude>",  "quantity": 1, "weight": 5.6 },
+    { "product_id": "<nasi-goreng>", "quantity": 2 }
+  ]
+}
+```
+
+Bentuk yang sama berlaku untuk `POST /api/v1/orders/:id/add-items` dan untuk pemesanan
+mandiri `POST /api/v1/self-order/orders`.
+
+**Presisi.** Berat dibulatkan backend ke 3 desimal. Kirim `4.2` atau `4.237`; angka di
+bawah `0.001` membulat ke nol dan ditolak.
+
+**Harga.** Field `unit_price` pada request **diabaikan** — harga selalu diambil backend
+dari master produk. Jangan mengirim harga hasil hitungan sendiri.
+
+---
+
+## 4. Menampilkan baris
+
+Setiap `order_items[]` di response membawa empat field tambahan:
+
+```json
+{
+  "product_name": "Ikan Tude",
+  "quantity": 1,
+  "weight": 4.2,
+  "unit_id": "…",
+  "unit_name": "Ons",
+  "unit_abbreviation": "ons",
+  "unit_price": 4500,
+  "total_price": 18900
+}
+```
+
+Semuanya `null` atau absen untuk produk biasa, jadi cabangkan tampilan pada `weight`:
+
+| Kondisi | Tampilkan |
+|---|---|
+| `weight == null` | `2 × Rp 25.000` |
+| `weight != null` | `4,2 ons × Rp 4.500` |
+
+**Jangan menampilkan `quantity` untuk baris berbobot** — nilainya selalu 1 dan akan
+terbaca seperti "satu ons". Gunakan `weight` dengan `unit_abbreviation`, dan pakai koma
+desimal sesuai format Indonesia.
+
+---
+
+## 5. Void, refund, split bill
+
+Baris berbobot bersifat **utuh**: dibatalkan seluruhnya atau tidak sama sekali. Karena
+`quantity`-nya 1, semua endpoint cukup dikirimi `1`, dan backend menghitung nilai
+rupiahnya dari `weight`.
+
+| Aksi | Endpoint | Field untuk baris berbobot |
+|---|---|---|
+| Void per item | `POST /orders/void` | `items[].quantity: 1` |
+| Refund per item | `POST /orders/:id/refund` | `order_items[].refund_quantity: 1` (atau kosongkan) |
+| Split bill per item | `POST /orders/split-bill` | `items[].quantity: 1` = bayar baris itu penuh |
+
+```json
+{
+  "order_id": "…",
+  "reason": "Salah timbang",
+  "type": "ITEM",
+  "items": [
+    { "order_item_id": "<baris 4,2 ons>", "quantity": 1 }
+  ]
+}
+```
+
+Untuk split bill, baris berbobot hanya bisa berstatus belum dibayar atau lunas — tidak
+ada nilai di antaranya. Sembunyikan stepper jumlah pada baris berbobot, ganti dengan
+tombol pilih baris.
+
+**Batasan yang disengaja.** Mengembalikan *sebagian berat* — 1 ons dari baris 4,2 ons —
+tidak didukung. Koreksi salah timbang ditangani dengan void baris itu lalu input ulang,
+sehingga jejak auditnya tetap jujur.
+
+---
+
+## 6. Referensi error
+
+Semua error mengikuti amplop standar. Pesan validasi baru muncul dengan kode `900`:
+
+```json
+{
+  "success": false,
+  "data": null,
+  "errors": [
+    { "code": "900", "entity": "ORDER",
+      "cause": "product Ikan Tude is sold by weight and requires a weight" }
+  ]
+}
+```
+
+| Pesan (`cause`) | Penyebab | Perbaikan di klien |
+|---|---|---|
+| `… is sold by weight and requires a weight` | Produk `sell_by: "weight"` dikirim tanpa `weight` | Wajibkan input timbangan sebelum item masuk keranjang |
+| `… is not sold by weight and must not carry a weight` | `weight` dikirim untuk produk satuan | Kirim `weight` hanya bila `sell_by == "weight"` |
+| `weight for … must be greater than 0` | Berat nol, negatif, atau membulat ke nol | Validasi minimal `0.001` di keypad |
+| `quantity for … must be at least 1` | Produk satuan dengan `quantity` ≤ 0 | Perilaku lama, tidak berubah |
+
+Pesan menyebut **nama produk**, sehingga bisa ditampilkan apa adanya ke kasir.
+
+### Setup produk (Backoffice)
+
+| Pesan (`cause`) | Penyebab | Perbaikan di klien |
+|---|---|---|
+| `unit_id is required when sell_by is 'weight'` | Produk timbangan dibuat tanpa satuan | Wajibkan pemilih satuan saat Timbangan dipilih |
+| `sell_by must be either 'unit' or 'weight'` | Nilai `sell_by` di luar dua itu | Kirim persis `"unit"` atau `"weight"` |
+| `product '…' is sold by weight and requires a unit_id` | Update membuat produk jadi timbangan tanpa satuan | Kirim `unit_id` bersama perubahan `sell_by` |
+
+---
+
+## 7. Kompatibilitas mundur
+
+- Semua produk lama otomatis `sell_by: "unit"`. Perilakunya identik dengan sebelumnya.
+- `weight` opsional di request. Klien yang tidak mengenalnya tetap berfungsi penuh untuk
+  produk satuan.
+- Field baru di response semuanya `omitempty` — tidak muncul untuk baris biasa, jadi
+  parser lama tidak terganggu.
+- `quantity` tetap **integer** di seluruh API. Tidak ada field yang berubah tipe.
+
+Yang tidak berfungsi di klien lama hanyalah menjual produk timbangan itu sendiri —
+permintaannya ditolak dengan pesan jelas, bukan gagal diam-diam.
+
+---
+
+## 8. Batasan yang diketahui
+
+- **Pembulatan uang ke 2 desimal.** `4,237 ons × Rp 4.500` tersimpan `Rp 19.066,50`,
+  bukan dibulatkan ke rupiah utuh. Bila kasir harus menerima rupiah penuh, ini perlu
+  diputuskan dan diubah di backend lebih dulu (`RoundMoney`, satu tempat).
+- **Stok belum otomatis berkurang** saat penjualan — untuk produk timbangan maupun
+  produk biasa. Pengurangan stok belum tersambung di backend, jadi jangan menampilkan
+  sisa stok yang mengandaikan itu berjalan.
+
+---
+
+## 9. Checklist per tim
+
+**Backoffice Website**
+
+- [ ] CRUD satuan tersedia di menu master data
+- [ ] Form produk punya pilihan cara jual: Satuan / Timbangan
+- [ ] Pemilih satuan menjadi wajib saat Timbangan dipilih
+- [ ] Label harga ikut satuan — "Harga per ons"
+- [ ] `sell_by` dikunci untuk produk yang sudah bertransaksi
+- [ ] Daftar produk menandai mana yang dijual per timbangan
+- [ ] Laporan harian menampilkan kolom Berat
+
+**POS Mobile**
+
+- [ ] Menu membaca `sell_by` tiap produk
+- [ ] Papan angka desimal untuk produk timbangan
+- [ ] Kirim `quantity: 1` + `weight`
+- [ ] Dua penimbangan menjadi dua baris, tidak digabung
+- [ ] Keranjang & struk menampilkan `4,2 ons × Rp 4.500`
+- [ ] Void & refund baris berbobot bersifat utuh
+- [ ] Split bill: pilih baris, bukan stepper jumlah
+- [ ] Pesan error validasi ditampilkan ke kasir

lib/application/auth/auth_bloc.dart

@@ -33,16 +33,16 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
             state.copyWith(
               failureOption: optionOf(f),
               status: token
-                  ? AuthStatus.authenticated()
-                  : AuthStatus.unauthenticated(),
+                  ? const AuthStatus.authenticated()
+                  : const AuthStatus.unauthenticated(),
             ),
           ),
           (user) => emit(
             state.copyWith(
               user: user,
               status: token
-                  ? AuthStatus.authenticated()
-                  : AuthStatus.unauthenticated(),
+                  ? const AuthStatus.authenticated()
+                  : const AuthStatus.unauthenticated(),
             ),
           ),
         );

lib/application/auth/login_form/login_form_bloc.dart

@@ -5,6 +5,9 @@ import 'package:dartz/dartz.dart';
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:injectable/injectable.dart';
 
+import '../../../common/service/device_info_service.dart';
+import '../../../common/service/unit_registry.dart';
+import '../../../common/service/fcm_service.dart';
 import '../../../domain/auth/auth.dart';
 
 part 'login_form_event.dart';
@@ -14,7 +17,16 @@ part 'login_form_bloc.freezed.dart';
 @injectable
 class LoginFormBloc extends Bloc<LoginFormEvent, LoginFormState> {
   final IAuthRepository _authRepository;
-  LoginFormBloc(this._authRepository) : super(LoginFormState.initial()) {
+  final FcmService _fcmService;
+  final DeviceInfoService _deviceInfoService;
+  final UnitRegistry _unitRegistry;
+
+  LoginFormBloc(
+    this._authRepository,
+    this._fcmService,
+    this._deviceInfoService,
+    this._unitRegistry,
+  ) : super(LoginFormState.initial()) {
     on<LoginFormEvent>(_onLoginFormEvent);
   }
 
@@ -43,11 +55,22 @@ class LoginFormBloc extends Bloc<LoginFormEvent, LoginFormState> {
         );
 
         if (emailValid && passwordValid) {
+          final fcmToken = await _fcmService.getToken() ?? '';
+          final devicePayload = await _deviceInfoService.getDevicePayload();
+
           failureOrLogin = await _authRepository.login(
             email: state.email,
             password: state.password,
+            fcmToken: fcmToken,
+            devicePayload: devicePayload,
           );
 
+          // Master satuan diambil sekali per sesi supaya keranjang bisa
+          // menulis "4,2 ons" tanpa menunggu request saat kasir menimbang.
+          if (failureOrLogin.isRight()) {
+            await _unitRegistry.load(forceRefresh: true);
+          }
+
           emit(
             state.copyWith(
               isSubmitting: false,

lib/application/auth/logout/logout_bloc.dart

@@ -0,0 +1,38 @@
+import 'package:bloc/bloc.dart';
+import 'package:dartz/dartz.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:injectable/injectable.dart';
+
+import '../../../domain/auth/auth.dart';
+
+part 'logout_event.dart';
+part 'logout_state.dart';
+part 'logout_bloc.freezed.dart';
+
+@injectable
+class LogoutBloc extends Bloc<LogoutEvent, LogoutState> {
+  final IAuthRepository _authRepository;
+  LogoutBloc(this._authRepository) : super(LogoutState.initial()) {
+    on<LogoutEvent>(_onLogoutEvent);
+  }
+
+  Future<void> _onLogoutEvent(LogoutEvent event, Emitter<LogoutState> emit) {
+    return event.map(
+      logout: (e) async {
+        Either<AuthFailure, Unit>? failureOrSuccess;
+        emit(
+          state.copyWith(isLoggingOut: true, logoutFailureOrSuccess: none()),
+        );
+
+        failureOrSuccess = await _authRepository.logout();
+
+        emit(
+          state.copyWith(
+            isLoggingOut: false,
+            logoutFailureOrSuccess: optionOf(failureOrSuccess),
+          ),
+        );
+      },
+    );
+  }
+}

lib/application/auth/logout/logout_bloc.freezed.dart

@@ -0,0 +1,332 @@
+// coverage:ignore-file
+// GENERATED CODE - DO NOT MODIFY BY HAND
+// ignore_for_file: type=lint
+// ignore_for_file: unused_element, deprecated_member_use, deprecated_member_use_from_same_package, use_function_type_syntax_for_parameters, unnecessary_const, avoid_init_to_null, invalid_override_different_default_values_named, prefer_expression_function_bodies, annotate_overrides, invalid_annotation_target, unnecessary_question_mark
+
+part of 'logout_bloc.dart';
+
+// **************************************************************************
+// FreezedGenerator
+// **************************************************************************
+
+T _$identity<T>(T value) => value;
+
+final _privateConstructorUsedError = UnsupportedError(
+  'It seems like you constructed your class using `MyClass._()`. This constructor is only meant to be used by freezed and you are not supposed to need it nor use it.\nPlease check the documentation here for more information: https://github.com/rrousselGit/freezed#adding-getters-and-methods-to-our-models',
+);
+
+/// @nodoc
+mixin _$LogoutEvent {
+  @optionalTypeArgs
+  TResult when<TResult extends Object?>({required TResult Function() logout}) =>
+      throw _privateConstructorUsedError;
+  @optionalTypeArgs
+  TResult? whenOrNull<TResult extends Object?>({TResult? Function()? logout}) =>
+      throw _privateConstructorUsedError;
+  @optionalTypeArgs
+  TResult maybeWhen<TResult extends Object?>({
+    TResult Function()? logout,
+    required TResult orElse(),
+  }) => throw _privateConstructorUsedError;
+  @optionalTypeArgs
+  TResult map<TResult extends Object?>({
+    required TResult Function(_Logout value) logout,
+  }) => throw _privateConstructorUsedError;
+  @optionalTypeArgs
+  TResult? mapOrNull<TResult extends Object?>({
+    TResult? Function(_Logout value)? logout,
+  }) => throw _privateConstructorUsedError;
+  @optionalTypeArgs
+  TResult maybeMap<TResult extends Object?>({
+    TResult Function(_Logout value)? logout,
+    required TResult orElse(),
+  }) => throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $LogoutEventCopyWith<$Res> {
+  factory $LogoutEventCopyWith(
+    LogoutEvent value,
+    $Res Function(LogoutEvent) then,
+  ) = _$LogoutEventCopyWithImpl<$Res, LogoutEvent>;
+}
+
+/// @nodoc
+class _$LogoutEventCopyWithImpl<$Res, $Val extends LogoutEvent>
+    implements $LogoutEventCopyWith<$Res> {
+  _$LogoutEventCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of LogoutEvent
+  /// with the given fields replaced by the non-null parameter values.
+}
+
+/// @nodoc
+abstract class _$$LogoutImplCopyWith<$Res> {
+  factory _$$LogoutImplCopyWith(
+    _$LogoutImpl value,
+    $Res Function(_$LogoutImpl) then,
+  ) = __$$LogoutImplCopyWithImpl<$Res>;
+}
+
+/// @nodoc
+class __$$LogoutImplCopyWithImpl<$Res>
+    extends _$LogoutEventCopyWithImpl<$Res, _$LogoutImpl>
+    implements _$$LogoutImplCopyWith<$Res> {
+  __$$LogoutImplCopyWithImpl(
+    _$LogoutImpl _value,
+    $Res Function(_$LogoutImpl) _then,
+  ) : super(_value, _then);
+
+  /// Create a copy of LogoutEvent
+  /// with the given fields replaced by the non-null parameter values.
+}
+
+/// @nodoc
+
+class _$LogoutImpl implements _Logout {
+  const _$LogoutImpl();
+
+  @override
+  String toString() {
+    return 'LogoutEvent.logout()';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType && other is _$LogoutImpl);
+  }
+
+  @override
+  int get hashCode => runtimeType.hashCode;
+
+  @override
+  @optionalTypeArgs
+  TResult when<TResult extends Object?>({required TResult Function() logout}) {
+    return logout();
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult? whenOrNull<TResult extends Object?>({TResult? Function()? logout}) {
+    return logout?.call();
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult maybeWhen<TResult extends Object?>({
+    TResult Function()? logout,
+    required TResult orElse(),
+  }) {
+    if (logout != null) {
+      return logout();
+    }
+    return orElse();
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult map<TResult extends Object?>({
+    required TResult Function(_Logout value) logout,
+  }) {
+    return logout(this);
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult? mapOrNull<TResult extends Object?>({
+    TResult? Function(_Logout value)? logout,
+  }) {
+    return logout?.call(this);
+  }
+
+  @override
+  @optionalTypeArgs
+  TResult maybeMap<TResult extends Object?>({
+    TResult Function(_Logout value)? logout,
+    required TResult orElse(),
+  }) {
+    if (logout != null) {
+      return logout(this);
+    }
+    return orElse();
+  }
+}
+
+abstract class _Logout implements LogoutEvent {
+  const factory _Logout() = _$LogoutImpl;
+}
+
+/// @nodoc
+mixin _$LogoutState {
+  Option<Either<AuthFailure, Unit>> get logoutFailureOrSuccess =>
+      throw _privateConstructorUsedError;
+  bool get isLoggingOut => throw _privateConstructorUsedError;
+
+  /// Create a copy of LogoutState
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $LogoutStateCopyWith<LogoutState> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $LogoutStateCopyWith<$Res> {
+  factory $LogoutStateCopyWith(
+    LogoutState value,
+    $Res Function(LogoutState) then,
+  ) = _$LogoutStateCopyWithImpl<$Res, LogoutState>;
+  @useResult
+  $Res call({
+    Option<Either<AuthFailure, Unit>> logoutFailureOrSuccess,
+    bool isLoggingOut,
+  });
+}
+
+/// @nodoc
+class _$LogoutStateCopyWithImpl<$Res, $Val extends LogoutState>
+    implements $LogoutStateCopyWith<$Res> {
+  _$LogoutStateCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of LogoutState
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? logoutFailureOrSuccess = null,
+    Object? isLoggingOut = null,
+  }) {
+    return _then(
+      _value.copyWith(
+            logoutFailureOrSuccess: null == logoutFailureOrSuccess
+                ? _value.logoutFailureOrSuccess
+                : logoutFailureOrSuccess // ignore: cast_nullable_to_non_nullable
+                      as Option<Either<AuthFailure, Unit>>,
+            isLoggingOut: null == isLoggingOut
+                ? _value.isLoggingOut
+                : isLoggingOut // ignore: cast_nullable_to_non_nullable
+                      as bool,
+          )
+          as $Val,
+    );
+  }
+}
+
+/// @nodoc
+abstract class _$$LogoutStateImplCopyWith<$Res>
+    implements $LogoutStateCopyWith<$Res> {
+  factory _$$LogoutStateImplCopyWith(
+    _$LogoutStateImpl value,
+    $Res Function(_$LogoutStateImpl) then,
+  ) = __$$LogoutStateImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call({
+    Option<Either<AuthFailure, Unit>> logoutFailureOrSuccess,
+    bool isLoggingOut,
+  });
+}
+
+/// @nodoc
+class __$$LogoutStateImplCopyWithImpl<$Res>
+    extends _$LogoutStateCopyWithImpl<$Res, _$LogoutStateImpl>
+    implements _$$LogoutStateImplCopyWith<$Res> {
+  __$$LogoutStateImplCopyWithImpl(
+    _$LogoutStateImpl _value,
+    $Res Function(_$LogoutStateImpl) _then,
+  ) : super(_value, _then);
+
+  /// Create a copy of LogoutState
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? logoutFailureOrSuccess = null,
+    Object? isLoggingOut = null,
+  }) {
+    return _then(
+      _$LogoutStateImpl(
+        logoutFailureOrSuccess: null == logoutFailureOrSuccess
+            ? _value.logoutFailureOrSuccess
+            : logoutFailureOrSuccess // ignore: cast_nullable_to_non_nullable
+                  as Option<Either<AuthFailure, Unit>>,
+        isLoggingOut: null == isLoggingOut
+            ? _value.isLoggingOut
+            : isLoggingOut // ignore: cast_nullable_to_non_nullable
+                  as bool,
+      ),
+    );
+  }
+}
+
+/// @nodoc
+
+class _$LogoutStateImpl implements _LogoutState {
+  _$LogoutStateImpl({
+    required this.logoutFailureOrSuccess,
+    this.isLoggingOut = false,
+  });
+
+  @override
+  final Option<Either<AuthFailure, Unit>> logoutFailureOrSuccess;
+  @override
+  @JsonKey()
+  final bool isLoggingOut;
+
+  @override
+  String toString() {
+    return 'LogoutState(logoutFailureOrSuccess: $logoutFailureOrSuccess, isLoggingOut: $isLoggingOut)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$LogoutStateImpl &&
+            (identical(other.logoutFailureOrSuccess, logoutFailureOrSuccess) ||
+                other.logoutFailureOrSuccess == logoutFailureOrSuccess) &&
+            (identical(other.isLoggingOut, isLoggingOut) ||
+                other.isLoggingOut == isLoggingOut));
+  }
+
+  @override
+  int get hashCode =>
+      Object.hash(runtimeType, logoutFailureOrSuccess, isLoggingOut);
+
+  /// Create a copy of LogoutState
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$LogoutStateImplCopyWith<_$LogoutStateImpl> get copyWith =>
+      __$$LogoutStateImplCopyWithImpl<_$LogoutStateImpl>(this, _$identity);
+}
+
+abstract class _LogoutState implements LogoutState {
+  factory _LogoutState({
+    required final Option<Either<AuthFailure, Unit>> logoutFailureOrSuccess,
+    final bool isLoggingOut,
+  }) = _$LogoutStateImpl;
+
+  @override
+  Option<Either<AuthFailure, Unit>> get logoutFailureOrSuccess;
+  @override
+  bool get isLoggingOut;
+
+  /// Create a copy of LogoutState
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$LogoutStateImplCopyWith<_$LogoutStateImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}

lib/application/auth/logout/logout_event.dart

@@ -0,0 +1,6 @@
+part of 'logout_bloc.dart';
+
+@freezed
+class LogoutEvent with _$LogoutEvent {
+  const factory LogoutEvent.logout() = _Logout;
+}

lib/application/auth/logout/logout_state.dart

@@ -0,0 +1,11 @@
+part of 'logout_bloc.dart';
+
+@freezed
+class LogoutState with _$LogoutState {
+  factory LogoutState({
+    required Option<Either<AuthFailure, Unit>> logoutFailureOrSuccess,
+    @Default(false) bool isLoggingOut,
+  }) = _LogoutState;
+
+  factory LogoutState.initial() => LogoutState(logoutFailureOrSuccess: none());
+}

lib/application/category/category_loader/category_loader_bloc.dart

@@ -175,7 +175,7 @@ class CategoryLoaderBloc
         _searchDebounce?.cancel();
 
         // Debounce search for better UX
-        _searchDebounce = Timer(Duration(milliseconds: 300), () async {
+        _searchDebounce = Timer(const Duration(milliseconds: 300), () async {
           emit(state.copyWith(isLoadingMore: true));
           _isLoadingMore = false;
 
@@ -237,7 +237,7 @@ class CategoryLoaderBloc
             );
 
             // After sync error, try to load local data
-            Timer(Duration(seconds: 2), () {
+            Timer(const Duration(seconds: 2), () {
               add(const CategoryLoaderEvent.getCategories());
             });
           },
@@ -251,7 +251,7 @@ class CategoryLoaderBloc
             );
 
             // After successful sync, load the updated data
-            Timer(Duration(seconds: 1), () {
+            Timer(const Duration(seconds: 1), () {
               add(const CategoryLoaderEvent.getCategories());
             });
           },

lib/application/checkout/checkout_form/checkout_form_bloc.dart

@@ -3,6 +3,7 @@ import 'dart:developer';
 import 'package:bloc/bloc.dart';
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:injectable/injectable.dart' hide Order;
+import 'package:uuid/uuid.dart';
 
 import '../../../common/types/order_type.dart';
 import '../../../domain/delivery/delivery.dart';
@@ -19,6 +20,33 @@ class CheckoutFormBloc extends Bloc<CheckoutFormEvent, CheckoutFormState> {
   CheckoutFormBloc() : super(CheckoutFormState.initial()) {
     on<CheckoutFormEvent>(_onCheckoutFormEvent);
   }
+
+  /// Baris berbobot dihitung `weight × harga`, baris cacah `quantity × harga`.
+  /// Satu tempat saja supaya total keranjang, subtotal, dan ringkasan tidak
+  /// pernah berbeda hitungan.
+  CheckoutFormState _recalculate(
+    CheckoutFormState state,
+    List<ProductQuantity> items,
+  ) {
+    final totalQuantity = items.fold<int>(
+      0,
+      // Baris berbobot selalu satu penimbangan, jadi dihitung satu.
+      (sum, item) => sum + (item.isWeighted ? 1 : item.quantity),
+    );
+
+    final totalPrice = items.fold<double>(
+      0,
+      (sum, item) => sum + item.lineTotal,
+    );
+
+    return state.copyWith(
+      items: items,
+      totalQuantity: totalQuantity,
+      totalPrice: totalPrice.toInt(),
+      isLoading: false,
+    );
+  }
+
   Future<void> _onCheckoutFormEvent(
     CheckoutFormEvent event,
     Emitter<CheckoutFormState> emit,
@@ -26,12 +54,21 @@ class CheckoutFormBloc extends Bloc<CheckoutFormEvent, CheckoutFormState> {
     return event.map(
       addItem: (e) async {
         final currentState = state;
+
+        // Produk timbangan tidak punya stepper — masuk lewat addWeightedItem
+        // setelah kasir memasukkan angka timbangan.
+        if (e.product.isSoldByWeight) {
+          log('⚖️ ${e.product.name} dijual per timbangan, butuh berat');
+          return;
+        }
+
         emit(currentState.copyWith(isLoading: true));
 
         List<ProductQuantity> items = [...currentState.items];
 
         final index = items.indexWhere(
           (element) =>
+              !element.isWeighted &&
               element.product.id == e.product.id &&
               element.variant?.id == e.variant?.id,
         );
@@ -49,35 +86,47 @@ class CheckoutFormBloc extends Bloc<CheckoutFormEvent, CheckoutFormState> {
               quantity: 1,
               variant: e.variant,
               notes: '',
+              lineId: const Uuid().v4(),
             ),
           );
         }
 
         log('🛒 Items updated: ${items.length} items total ${items.toList()}');
 
-        final totalQuantity = items.fold<int>(
-          0,
-          (sum, item) => sum + item.quantity,
-        );
+        emit(_recalculate(currentState, items));
+      },
+      addWeightedItem: (e) async {
+        final currentState = state;
+        emit(currentState.copyWith(isLoading: true));
 
-        final totalPrice = state.items.isEmpty
-            ? 0.0
-            : state.items
-                  .map(
-                    (e) =>
-                        (e.product.price * e.quantity) +
-                        (e.variant?.priceModifier ?? 0),
-                  )
-                  .reduce((value, element) => value + element);
-
-        emit(
-          currentState.copyWith(
-            items: items,
-            totalQuantity: totalQuantity,
-            totalPrice: totalPrice.toInt(),
-            isLoading: false,
+        // Sengaja tidak digabung dengan baris lain: dua penimbangan adalah dua
+        // ikan berbeda, masing-masing bisa di-void atau dibayar terpisah.
+        final items = [
+          ...currentState.items,
+          ProductQuantity(
+            product: e.product,
+            variant: e.variant,
+            quantity: 1,
+            notes: '',
+            lineId: const Uuid().v4(),
+            weight: e.weight,
           ),
-        );
+        ];
+
+        log('⚖️ Penimbangan baru: ${e.product.name} ${e.weight}');
+
+        emit(_recalculate(currentState, items));
+      },
+      updateItemWeight: (e) async {
+        final currentState = state;
+        final items = [...currentState.items];
+
+        final index = items.indexWhere((item) => item.lineId == e.lineId);
+        if (index == -1) return;
+
+        items[index] = items[index].copyWith(weight: e.weight);
+
+        emit(_recalculate(currentState, items));
       },
       removeItem: (e) async {
         final currentState = state;
@@ -86,6 +135,7 @@ class CheckoutFormBloc extends Bloc<CheckoutFormEvent, CheckoutFormState> {
 
         final index = items.indexWhere(
           (element) =>
+              !element.isWeighted &&
               element.product.id == e.product.id &&
               element.variant?.id == e.variant?.id,
         );
@@ -103,32 +153,18 @@ class CheckoutFormBloc extends Bloc<CheckoutFormEvent, CheckoutFormState> {
           }
         }
 
-        final totalQuantity = items.fold<int>(
-          0,
-          (sum, item) => sum + item.quantity,
-        );
-        final totalPrice = items.fold<int>(
-          0,
-          (sum, item) =>
-              sum +
-              (item.quantity *
-                  (item.variant?.priceModifier.toInt() ??
-                      item.product.price.toInt())),
-        );
+        log('🗑️ Item removed. Total items: ${items.length}');
 
-        log(
-          '🗑️ Item removed. Total items: ${items.length}, totalQuantity: $totalQuantity, totalPrice: $totalPrice',
-        );
+        emit(_recalculate(currentState, items));
+      },
+      removeLine: (e) async {
+        final currentState = state;
+        final items = [...currentState.items]
+          ..removeWhere((item) => item.lineId == e.lineId);
 
-        // Emit state baru
-        emit(
-          currentState.copyWith(
-            items: items,
-            totalQuantity: totalQuantity,
-            totalPrice: totalPrice,
-            isLoading: false,
-          ),
-        );
+        log('🗑️ Baris dihapus. Sisa ${items.length} baris');
+
+        emit(_recalculate(currentState, items));
       },
       started: (e) async {
         emit(CheckoutFormState.initial().copyWith(isLoading: true));
@@ -153,14 +189,13 @@ class CheckoutFormBloc extends Bloc<CheckoutFormEvent, CheckoutFormState> {
           );
         }
       },
-      updateItemNotes: (e) async {
+      updateLineNotes: (e) async {
         final currentState = state;
 
-        // Clone list items agar tidak mutasi langsung
+        // Catatan diikat ke baris, bukan ke produk: dua penimbangan produk yang
+        // sama bisa punya catatan berbeda.
         final items = [...currentState.items];
-        final index = items.indexWhere(
-          (element) => element.product.id == e.product.id,
-        );
+        final index = items.indexWhere((item) => item.lineId == e.lineId);
 
         if (index != -1) {
           items[index] = items[index].copyWith(notes: e.notes);
@@ -180,6 +215,9 @@ class CheckoutFormBloc extends Bloc<CheckoutFormEvent, CheckoutFormState> {
       orderAddedItems: (e) async {
         emit(state.copyWith(orderAdded: e.order));
       },
+      customerNameChanged: (e) async {
+        emit(state.copyWith(customerName: e.name));
+      },
     );
   }
 }

lib/application/checkout/checkout_form/checkout_form_event.dart

@@ -10,15 +10,32 @@ class CheckoutFormEvent with _$CheckoutFormEvent {
     ProductVariant? variant,
   ) = _AddItem;
 
+  /// Satu penimbangan = satu baris baru. Dipanggil setiap kali kasir selesai
+  /// memasukkan angka timbangan, meski produknya sama dengan baris lain.
+  const factory CheckoutFormEvent.addWeightedItem(
+    Product product,
+    ProductVariant? variant,
+    double weight,
+  ) = _AddWeightedItem;
+
+  /// Koreksi angka timbangan pada satu baris tertentu.
+  const factory CheckoutFormEvent.updateItemWeight(
+    String lineId,
+    double weight,
+  ) = _UpdateItemWeight;
+
   const factory CheckoutFormEvent.removeItem(
     Product product,
     ProductVariant? variant,
   ) = _RemoveItem;
 
-  const factory CheckoutFormEvent.updateItemNotes(
-    Product product,
+  /// Hapus satu baris utuh — satu-satunya cara membatalkan baris berbobot.
+  const factory CheckoutFormEvent.removeLine(String lineId) = _RemoveLine;
+
+  const factory CheckoutFormEvent.updateLineNotes(
+    String lineId,
     String notes,
-  ) = _UpdateItemNotes;
+  ) = _UpdateLineNotes;
 
   const factory CheckoutFormEvent.updateOrderType(OrderType orderType) =
       _UpdateOrderType;
@@ -30,4 +47,6 @@ class CheckoutFormEvent with _$CheckoutFormEvent {
 
   const factory CheckoutFormEvent.orderAddedItems(Order? order) =
       _OrderAddedItems;
+  const factory CheckoutFormEvent.customerNameChanged(String name) =
+      _CustomerNameChanged;
 }

lib/application/checkout/checkout_form/checkout_form_state.dart

@@ -13,6 +13,7 @@ class CheckoutFormState with _$CheckoutFormState {
     required int totalPrice,
     required String draftName,
     required OrderType orderType,
+    required String customerName,
     Delivery? delivery,
     Table? table,
     @Default(false) bool isLoading,
@@ -27,6 +28,7 @@ class CheckoutFormState with _$CheckoutFormState {
     totalQuantity: 0,
     totalPrice: 0,
     draftName: '',
+     customerName: '',
     orderType: OrderType.dineIn,
   );
 }

lib/application/order/order_form/order_form_bloc.dart

@@ -3,6 +3,7 @@ import 'package:dartz/dartz.dart' hide Order;
 import 'package:flutter/foundation.dart';
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:injectable/injectable.dart' hide Order;
+import 'package:uuid/uuid.dart';
 
 import '../../../common/types/order_type.dart';
 import '../../../domain/customer/customer.dart';
@@ -59,15 +60,7 @@ class OrderFormBloc extends Bloc<OrderFormEvent, OrderFormState> {
           notes: '',
           customerName: state.customerName ?? "",
           orderItems: e.items
-              .map(
-                (item) => OrderItemRequest(
-                  productId: item.product.id,
-                  productVariantId: item.variant?.id ?? "",
-                  quantity: item.quantity,
-                  unitPrice: item.product.price.toInt(),
-                  notes: item.notes,
-                ),
-              )
+              .map(OrderItemRequest.fromProductQuantity)
               .toList(),
         );
 
@@ -99,15 +92,7 @@ class OrderFormBloc extends Bloc<OrderFormEvent, OrderFormState> {
           notes: '',
           customerName: state.customerName ?? "",
           orderItems: e.items
-              .map(
-                (item) => OrderItemRequest(
-                  productId: item.product.id,
-                  productVariantId: item.variant?.id ?? "",
-                  quantity: item.quantity,
-                  unitPrice: item.product.price.toInt(),
-                  notes: item.notes,
-                ),
-              )
+              .map(OrderItemRequest.fromProductQuantity)
               .toList(),
         );
 
@@ -123,34 +108,35 @@ class OrderFormBloc extends Bloc<OrderFormEvent, OrderFormState> {
       addItemOrder: (e) async {
         Either<OrderFailure, Order> failureOrAddItemOrder;
 
+        // Generate new idempotency key saat user intent (tap Add Items)
+        // Kalau sedang retry, pakai key yang sama
+        final idempotencyKey = state.addItemIdempotencyKey ?? const Uuid().v4();
+
         emit(
           state.copyWith(
             isAddingItemOrder: true,
             failureOrAddItemOrder: none(),
+            addItemIdempotencyKey: idempotencyKey,
           ),
         );
 
         final request = e.items
-            .map(
-              (item) => AddItemOrderRequest(
-                productId: item.product.id,
-                productVariantId: item.variant?.id ?? '',
-                quantity: item.quantity,
-                unitPrice: item.product.price.toInt(),
-                notes: item.notes,
-              ),
-            )
+            .map(AddItemOrderRequest.fromProductQuantity)
             .toList();
 
         failureOrAddItemOrder = await _repository.addItemOrder(
           id: e.orderId,
           request: request,
+          idempotencyKey: idempotencyKey,
         );
 
         emit(
           state.copyWith(
             isAddingItemOrder: false,
             failureOrAddItemOrder: optionOf(failureOrAddItemOrder),
+            // Clear key on success, keep on failure for retry
+            addItemIdempotencyKey:
+                failureOrAddItemOrder.isRight() ? null : idempotencyKey,
           ),
         );
       },

lib/application/order/order_form/order_form_bloc.freezed.dart

@@ -1584,6 +1584,11 @@ mixin _$OrderFormState {
   bool get isCreatingWithPayment => throw _privateConstructorUsedError;
   bool get isAddingItemOrder => throw _privateConstructorUsedError;
 
+  /// Idempotency key untuk add item order.
+  /// Di-generate saat user tap "Add Items", dipakai ulang saat retry,
+  /// di-clear setelah sukses.
+  String? get addItemIdempotencyKey => throw _privateConstructorUsedError;
+
   /// Create a copy of OrderFormState
   /// with the given fields replaced by the non-null parameter values.
   @JsonKey(includeFromJson: false, includeToJson: false)
@@ -1608,6 +1613,7 @@ abstract class $OrderFormStateCopyWith<$Res> {
     bool isCreating,
     bool isCreatingWithPayment,
     bool isAddingItemOrder,
+    String? addItemIdempotencyKey,
   });
 
   $PaymentMethodCopyWith<$Res>? get paymentMethod;
@@ -1638,6 +1644,7 @@ class _$OrderFormStateCopyWithImpl<$Res, $Val extends OrderFormState>
     Object? isCreating = null,
     Object? isCreatingWithPayment = null,
     Object? isAddingItemOrder = null,
+    Object? addItemIdempotencyKey = freezed,
   }) {
     return _then(
       _value.copyWith(
@@ -1678,6 +1685,10 @@ class _$OrderFormStateCopyWithImpl<$Res, $Val extends OrderFormState>
                 ? _value.isAddingItemOrder
                 : isAddingItemOrder // ignore: cast_nullable_to_non_nullable
                       as bool,
+            addItemIdempotencyKey: freezed == addItemIdempotencyKey
+                ? _value.addItemIdempotencyKey
+                : addItemIdempotencyKey // ignore: cast_nullable_to_non_nullable
+                      as String?,
           )
           as $Val,
     );
@@ -1731,6 +1742,7 @@ abstract class _$$OrderFormStateImplCopyWith<$Res>
     bool isCreating,
     bool isCreatingWithPayment,
     bool isAddingItemOrder,
+    String? addItemIdempotencyKey,
   });
 
   @override
@@ -1762,6 +1774,7 @@ class __$$OrderFormStateImplCopyWithImpl<$Res>
     Object? isCreating = null,
     Object? isCreatingWithPayment = null,
     Object? isAddingItemOrder = null,
+    Object? addItemIdempotencyKey = freezed,
   }) {
     return _then(
       _$OrderFormStateImpl(
@@ -1801,6 +1814,10 @@ class __$$OrderFormStateImplCopyWithImpl<$Res>
             ? _value.isAddingItemOrder
             : isAddingItemOrder // ignore: cast_nullable_to_non_nullable
                   as bool,
+        addItemIdempotencyKey: freezed == addItemIdempotencyKey
+            ? _value.addItemIdempotencyKey
+            : addItemIdempotencyKey // ignore: cast_nullable_to_non_nullable
+                  as String?,
       ),
     );
   }
@@ -1821,6 +1838,7 @@ class _$OrderFormStateImpl
     this.isCreating = false,
     this.isCreatingWithPayment = false,
     this.isAddingItemOrder = false,
+    this.addItemIdempotencyKey,
   });
 
   @override
@@ -1845,9 +1863,15 @@ class _$OrderFormStateImpl
   @JsonKey()
   final bool isAddingItemOrder;
 
+  /// Idempotency key untuk add item order.
+  /// Di-generate saat user tap "Add Items", dipakai ulang saat retry,
+  /// di-clear setelah sukses.
+  @override
+  final String? addItemIdempotencyKey;
+
   @override
   String toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) {
-    return 'OrderFormState(paymentMethod: $paymentMethod, customerName: $customerName, customer: $customer, failureOrCreateOrder: $failureOrCreateOrder, failureOrCreateOrderWithPayment: $failureOrCreateOrderWithPayment, failureOrAddItemOrder: $failureOrAddItemOrder, isCreating: $isCreating, isCreatingWithPayment: $isCreatingWithPayment, isAddingItemOrder: $isAddingItemOrder)';
+    return 'OrderFormState(paymentMethod: $paymentMethod, customerName: $customerName, customer: $customer, failureOrCreateOrder: $failureOrCreateOrder, failureOrCreateOrderWithPayment: $failureOrCreateOrderWithPayment, failureOrAddItemOrder: $failureOrAddItemOrder, isCreating: $isCreating, isCreatingWithPayment: $isCreatingWithPayment, isAddingItemOrder: $isAddingItemOrder, addItemIdempotencyKey: $addItemIdempotencyKey)';
   }
 
   @override
@@ -1868,7 +1892,10 @@ class _$OrderFormStateImpl
       ..add(DiagnosticsProperty('failureOrAddItemOrder', failureOrAddItemOrder))
       ..add(DiagnosticsProperty('isCreating', isCreating))
       ..add(DiagnosticsProperty('isCreatingWithPayment', isCreatingWithPayment))
-      ..add(DiagnosticsProperty('isAddingItemOrder', isAddingItemOrder));
+      ..add(DiagnosticsProperty('isAddingItemOrder', isAddingItemOrder))
+      ..add(
+        DiagnosticsProperty('addItemIdempotencyKey', addItemIdempotencyKey),
+      );
   }
 
   @override
@@ -1897,7 +1924,9 @@ class _$OrderFormStateImpl
             (identical(other.isCreatingWithPayment, isCreatingWithPayment) ||
                 other.isCreatingWithPayment == isCreatingWithPayment) &&
             (identical(other.isAddingItemOrder, isAddingItemOrder) ||
-                other.isAddingItemOrder == isAddingItemOrder));
+                other.isAddingItemOrder == isAddingItemOrder) &&
+            (identical(other.addItemIdempotencyKey, addItemIdempotencyKey) ||
+                other.addItemIdempotencyKey == addItemIdempotencyKey));
   }
 
   @override
@@ -1912,6 +1941,7 @@ class _$OrderFormStateImpl
     isCreating,
     isCreatingWithPayment,
     isAddingItemOrder,
+    addItemIdempotencyKey,
   );
 
   /// Create a copy of OrderFormState
@@ -1938,6 +1968,7 @@ abstract class _OrderFormState implements OrderFormState {
     final bool isCreating,
     final bool isCreatingWithPayment,
     final bool isAddingItemOrder,
+    final String? addItemIdempotencyKey,
   }) = _$OrderFormStateImpl;
 
   @override
@@ -1959,6 +1990,12 @@ abstract class _OrderFormState implements OrderFormState {
   @override
   bool get isAddingItemOrder;
 
+  /// Idempotency key untuk add item order.
+  /// Di-generate saat user tap "Add Items", dipakai ulang saat retry,
+  /// di-clear setelah sukses.
+  @override
+  String? get addItemIdempotencyKey;
+
   /// Create a copy of OrderFormState
   /// with the given fields replaced by the non-null parameter values.
   @override

lib/application/order/order_form/order_form_state.dart

@@ -13,6 +13,10 @@ class OrderFormState with _$OrderFormState {
     @Default(false) bool isCreating,
     @Default(false) bool isCreatingWithPayment,
     @Default(false) bool isAddingItemOrder,
+    /// Idempotency key untuk add item order.
+    /// Di-generate saat user tap "Add Items", dipakai ulang saat retry,
+    /// di-clear setelah sukses.
+    String? addItemIdempotencyKey,
   }) = _OrderFormState;
 
   factory OrderFormState.initial() => OrderFormState(

lib/application/payment/payment_form/payment_form_bloc.dart

@@ -4,6 +4,7 @@ import 'package:bloc/bloc.dart';
 import 'package:dartz/dartz.dart' hide Order;
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:injectable/injectable.dart' hide Order;
+import 'package:uuid/uuid.dart';
 
 import '../../../common/types/split_type.dart';
 import '../../../domain/order/order.dart';
@@ -38,7 +39,15 @@ class PaymentFormBloc extends Bloc<PaymentFormEvent, PaymentFormState> {
       submitted: (e) async {
         Either<OrderFailure, Payment> failureOrPayment;
 
-        emit(state.copyWith(isSubmitting: true, failureOrPayment: none()));
+        // Generate new idempotency key saat user intent (tap Bayar)
+        // Kalau sedang retry (isSubmitting sebelumnya gagal), pakai key yang sama
+        final idempotencyKey = state.idempotencyKey ?? const Uuid().v4();
+
+        emit(state.copyWith(
+          isSubmitting: true,
+          failureOrPayment: none(),
+          idempotencyKey: idempotencyKey,
+        ));
 
         final request = PaymentRequest(
           orderId: state.order.id,
@@ -58,20 +67,32 @@ class PaymentFormBloc extends Bloc<PaymentFormEvent, PaymentFormState> {
               .toList(),
         );
 
-        failureOrPayment = await _repository.createPayment(request: request);
+        failureOrPayment = await _repository.createPayment(
+          request: request,
+          idempotencyKey: idempotencyKey,
+        );
 
         emit(
           state.copyWith(
             isSubmitting: false,
             failureOrPayment: optionOf(failureOrPayment),
+            // Clear key on success, keep on failure for retry
+            idempotencyKey: failureOrPayment.isRight() ? null : idempotencyKey,
           ),
         );
       },
       submittedSplitBill: (e) async {
         Either<OrderFailure, Payment> failureOrPayment;
 
+        // Generate new idempotency key untuk split bill
+        final idempotencyKey = state.splitBillIdempotencyKey ?? const Uuid().v4();
+
         emit(
-          state.copyWith(isSubmitting: true, failureOrPaymentSplitBill: none()),
+          state.copyWith(
+            isSubmitting: true,
+            failureOrPaymentSplitBill: none(),
+            splitBillIdempotencyKey: idempotencyKey,
+          ),
         );
 
         final request = PaymentSplitBillRequest(
@@ -93,12 +114,18 @@ class PaymentFormBloc extends Bloc<PaymentFormEvent, PaymentFormState> {
 
         log(request.toString());
 
-        failureOrPayment = await _repository.createSplitBill(request);
+        failureOrPayment = await _repository.createSplitBill(
+          request,
+          idempotencyKey: idempotencyKey,
+        );
 
         emit(
           state.copyWith(
             isSubmitting: false,
             failureOrPaymentSplitBill: optionOf(failureOrPayment),
+            // Clear key on success, keep on failure for retry
+            splitBillIdempotencyKey:
+                failureOrPayment.isRight() ? null : idempotencyKey,
           ),
         );
       },

lib/application/payment/payment_form/payment_form_bloc.freezed.dart

@@ -813,6 +813,14 @@ mixin _$PaymentFormState {
   PaymentMethod? get paymentMethod => throw _privateConstructorUsedError;
   bool get isSubmitting => throw _privateConstructorUsedError;
 
+  /// Idempotency key untuk payment submission.
+  /// Di-generate saat user tap "Bayar", dipakai ulang saat retry,
+  /// di-clear setelah sukses.
+  String? get idempotencyKey => throw _privateConstructorUsedError;
+
+  /// Idempotency key untuk split bill submission.
+  String? get splitBillIdempotencyKey => throw _privateConstructorUsedError;
+
   /// Create a copy of PaymentFormState
   /// with the given fields replaced by the non-null parameter values.
   @JsonKey(includeFromJson: false, includeToJson: false)
@@ -834,6 +842,8 @@ abstract class $PaymentFormStateCopyWith<$Res> {
     Option<Either<OrderFailure, Payment>> failureOrPaymentSplitBill,
     PaymentMethod? paymentMethod,
     bool isSubmitting,
+    String? idempotencyKey,
+    String? splitBillIdempotencyKey,
   });
 
   $OrderCopyWith<$Res> get order;
@@ -861,6 +871,8 @@ class _$PaymentFormStateCopyWithImpl<$Res, $Val extends PaymentFormState>
     Object? failureOrPaymentSplitBill = null,
     Object? paymentMethod = freezed,
     Object? isSubmitting = null,
+    Object? idempotencyKey = freezed,
+    Object? splitBillIdempotencyKey = freezed,
   }) {
     return _then(
       _value.copyWith(
@@ -888,6 +900,14 @@ class _$PaymentFormStateCopyWithImpl<$Res, $Val extends PaymentFormState>
                 ? _value.isSubmitting
                 : isSubmitting // ignore: cast_nullable_to_non_nullable
                       as bool,
+            idempotencyKey: freezed == idempotencyKey
+                ? _value.idempotencyKey
+                : idempotencyKey // ignore: cast_nullable_to_non_nullable
+                      as String?,
+            splitBillIdempotencyKey: freezed == splitBillIdempotencyKey
+                ? _value.splitBillIdempotencyKey
+                : splitBillIdempotencyKey // ignore: cast_nullable_to_non_nullable
+                      as String?,
           )
           as $Val,
     );
@@ -934,6 +954,8 @@ abstract class _$$PaymentFormStateImplCopyWith<$Res>
     Option<Either<OrderFailure, Payment>> failureOrPaymentSplitBill,
     PaymentMethod? paymentMethod,
     bool isSubmitting,
+    String? idempotencyKey,
+    String? splitBillIdempotencyKey,
   });
 
   @override
@@ -962,6 +984,8 @@ class __$$PaymentFormStateImplCopyWithImpl<$Res>
     Object? failureOrPaymentSplitBill = null,
     Object? paymentMethod = freezed,
     Object? isSubmitting = null,
+    Object? idempotencyKey = freezed,
+    Object? splitBillIdempotencyKey = freezed,
   }) {
     return _then(
       _$PaymentFormStateImpl(
@@ -989,6 +1013,14 @@ class __$$PaymentFormStateImplCopyWithImpl<$Res>
             ? _value.isSubmitting
             : isSubmitting // ignore: cast_nullable_to_non_nullable
                   as bool,
+        idempotencyKey: freezed == idempotencyKey
+            ? _value.idempotencyKey
+            : idempotencyKey // ignore: cast_nullable_to_non_nullable
+                  as String?,
+        splitBillIdempotencyKey: freezed == splitBillIdempotencyKey
+            ? _value.splitBillIdempotencyKey
+            : splitBillIdempotencyKey // ignore: cast_nullable_to_non_nullable
+                  as String?,
       ),
     );
   }
@@ -1004,6 +1036,8 @@ class _$PaymentFormStateImpl implements _PaymentFormState {
     required this.failureOrPaymentSplitBill,
     this.paymentMethod,
     this.isSubmitting = false,
+    this.idempotencyKey,
+    this.splitBillIdempotencyKey,
   }) : _pendingItems = pendingItems;
 
   @override
@@ -1026,9 +1060,19 @@ class _$PaymentFormStateImpl implements _PaymentFormState {
   @JsonKey()
   final bool isSubmitting;
 
+  /// Idempotency key untuk payment submission.
+  /// Di-generate saat user tap "Bayar", dipakai ulang saat retry,
+  /// di-clear setelah sukses.
+  @override
+  final String? idempotencyKey;
+
+  /// Idempotency key untuk split bill submission.
+  @override
+  final String? splitBillIdempotencyKey;
+
   @override
   String toString() {
-    return 'PaymentFormState(order: $order, pendingItems: $pendingItems, failureOrPayment: $failureOrPayment, failureOrPaymentSplitBill: $failureOrPaymentSplitBill, paymentMethod: $paymentMethod, isSubmitting: $isSubmitting)';
+    return 'PaymentFormState(order: $order, pendingItems: $pendingItems, failureOrPayment: $failureOrPayment, failureOrPaymentSplitBill: $failureOrPaymentSplitBill, paymentMethod: $paymentMethod, isSubmitting: $isSubmitting, idempotencyKey: $idempotencyKey, splitBillIdempotencyKey: $splitBillIdempotencyKey)';
   }
 
   @override
@@ -1051,7 +1095,14 @@ class _$PaymentFormStateImpl implements _PaymentFormState {
             (identical(other.paymentMethod, paymentMethod) ||
                 other.paymentMethod == paymentMethod) &&
             (identical(other.isSubmitting, isSubmitting) ||
-                other.isSubmitting == isSubmitting));
+                other.isSubmitting == isSubmitting) &&
+            (identical(other.idempotencyKey, idempotencyKey) ||
+                other.idempotencyKey == idempotencyKey) &&
+            (identical(
+                  other.splitBillIdempotencyKey,
+                  splitBillIdempotencyKey,
+                ) ||
+                other.splitBillIdempotencyKey == splitBillIdempotencyKey));
   }
 
   @override
@@ -1063,6 +1114,8 @@ class _$PaymentFormStateImpl implements _PaymentFormState {
     failureOrPaymentSplitBill,
     paymentMethod,
     isSubmitting,
+    idempotencyKey,
+    splitBillIdempotencyKey,
   );
 
   /// Create a copy of PaymentFormState
@@ -1086,6 +1139,8 @@ abstract class _PaymentFormState implements PaymentFormState {
     failureOrPaymentSplitBill,
     final PaymentMethod? paymentMethod,
     final bool isSubmitting,
+    final String? idempotencyKey,
+    final String? splitBillIdempotencyKey,
   }) = _$PaymentFormStateImpl;
 
   @override
@@ -1101,6 +1156,16 @@ abstract class _PaymentFormState implements PaymentFormState {
   @override
   bool get isSubmitting;
 
+  /// Idempotency key untuk payment submission.
+  /// Di-generate saat user tap "Bayar", dipakai ulang saat retry,
+  /// di-clear setelah sukses.
+  @override
+  String? get idempotencyKey;
+
+  /// Idempotency key untuk split bill submission.
+  @override
+  String? get splitBillIdempotencyKey;
+
   /// Create a copy of PaymentFormState
   /// with the given fields replaced by the non-null parameter values.
   @override

lib/application/payment/payment_form/payment_form_state.dart

@@ -9,6 +9,12 @@ class PaymentFormState with _$PaymentFormState {
     required Option<Either<OrderFailure, Payment>> failureOrPaymentSplitBill,
     PaymentMethod? paymentMethod,
     @Default(false) bool isSubmitting,
+    /// Idempotency key untuk payment submission.
+    /// Di-generate saat user tap "Bayar", dipakai ulang saat retry,
+    /// di-clear setelah sukses.
+    String? idempotencyKey,
+    /// Idempotency key untuk split bill submission.
+    String? splitBillIdempotencyKey,
   }) = _PaymentFormState;
 
   factory PaymentFormState.initial() => PaymentFormState(

lib/application/printer/print_struck/print_struck_bloc.dart

@@ -1,5 +1,4 @@
 import 'package:bloc/bloc.dart';
-import 'package:dartz/dartz.dart' hide Order;
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:injectable/injectable.dart' hide Order;
 
@@ -21,40 +20,63 @@ class PrintStruckBloc extends Bloc<PrintStruckEvent, PrintStruckState> {
   Future<void> _onPrintStruckEvent(
     PrintStruckEvent event,
     Emitter<PrintStruckState> emit,
-  ) {
-    return event.map(
-      order: (e) async {
-        Either<PrinterFailure, Unit> failureOrSuccess;
+  ) => event.map(
+    order: (e) => _print(emit, e.order, _stationsForOrder(e.order)),
+    payment: (e) => _print(emit, e.order, const [PrintStation.receipt]),
+    cashier: (e) => _print(emit, e.order, const [PrintStation.cashier]),
+    checker: (e) => _print(emit, e.order, const [PrintStation.checker]),
+    kitchen: (e) => _print(emit, e.order, const [PrintStation.kitchen]),
+    bar: (e) => _print(emit, e.order, const [PrintStation.bar]),
+    voided: (e) => _print(emit, e.order, const [PrintStation.voided]),
+    splitBill: (e) => _print(emit, e.order, const [PrintStation.splitBill]),
+    retryFailed: (_) {
+      final order = state.order;
+      final failed = [
+        for (final station in state.failedStations) station.station,
+      ];
 
-        emit(state.copyWith(isPrinting: true, failureOrPrintStruck: none()));
+      if (order == null || failed.isEmpty) return Future.value();
 
-        failureOrSuccess = await _printerRepository.printStruckOrder(
-          order: e.order,
-        );
+      return _print(emit, order, failed);
+    },
+  );
 
-        emit(
-          state.copyWith(
-            isPrinting: false,
-            failureOrPrintStruck: optionOf(failureOrSuccess),
-          ),
-        );
-      },
-      saveOrder: (e) async {
-        Either<PrinterFailure, Unit> failureOrSuccess;
+  /// Struk pelanggan hanya ikut dicetak kalau ordernya sudah dibayar.
+  List<PrintStation> _stationsForOrder(Order order) => [
+    if (order.totalPaid > 0) PrintStation.receipt,
+    PrintStation.cashier,
+    PrintStation.checker,
+    PrintStation.kitchen,
+    PrintStation.bar,
+  ];
 
-        emit(state.copyWith(isPrinting: true, failureOrPrintStruck: none()));
+  Future<void> _print(
+    Emitter<PrintStruckState> emit,
+    Order order,
+    List<PrintStation> stations,
+  ) async {
+    // Tombol yang tertekan dua kali tidak boleh memulai job kedua — repository
+    // akan mengantrikannya dan progres yang tampil jadi membingungkan.
+    if (state.isPrinting) return;
 
-        failureOrSuccess = await _printerRepository.printStruckSaveOrder(
-          order: e.order,
-        );
-
-        emit(
-          state.copyWith(
-            isPrinting: false,
-            failureOrPrintStruck: optionOf(failureOrSuccess),
-          ),
-        );
-      },
+    emit(
+      state.copyWith(
+        isPrinting: true,
+        order: order,
+        jobId: state.jobId + 1,
+        stations: [
+          for (final station in stations) PrintStationResult.pending(station),
+        ],
+      ),
     );
+
+    await emit.forEach<List<PrintStationResult>>(
+      _printerRepository.printStations(order: order, stations: stations),
+      onData: (results) => state.copyWith(stations: results),
+    );
+
+    // Cetak bisa selesai setelah bloc ditutup (kasir keluar dari aplikasi).
+    if (isClosed) return;
+    emit(state.copyWith(isPrinting: false));
   }
 }

lib/application/printer/print_struck/print_struck_event.dart

@@ -2,6 +2,18 @@ part of 'print_struck_bloc.dart';
 
 @freezed
 class PrintStruckEvent with _$PrintStruckEvent {
+  /// Cetak seluruh station untuk satu order.
   const factory PrintStruckEvent.order(Order order) = _Order;
-  const factory PrintStruckEvent.saveOrder(Order order) = _SaveOrder;
+
+  const factory PrintStruckEvent.cashier(Order order) = _Cashier;
+  const factory PrintStruckEvent.payment(Order order) = _Payment;
+  const factory PrintStruckEvent.voided(Order order) = _Voided;
+  const factory PrintStruckEvent.checker(Order order) = _Checker;
+  const factory PrintStruckEvent.kitchen(Order order) = _Kitchen;
+  const factory PrintStruckEvent.bar(Order order) = _Bar;
+  const factory PrintStruckEvent.splitBill(Order order) = _SplitBill;
+
+  /// Ulangi hanya station yang gagal di job terakhir, tanpa mencetak ulang
+  /// station yang sudah keluar.
+  const factory PrintStruckEvent.retryFailed() = _RetryFailed;
 }

lib/application/printer/print_struck/print_struck_state.dart

@@ -2,11 +2,33 @@ part of 'print_struck_bloc.dart';
 
 @freezed
 class PrintStruckState with _$PrintStruckState {
-  factory PrintStruckState({
-    required Option<Either<PrinterFailure, Unit>> failureOrPrintStruck,
+  const PrintStruckState._();
+
+  const factory PrintStruckState({
+    /// Status seluruh station di job cetak terakhir, urut sesuai urutan cetak.
+    @Default(<PrintStationResult>[]) List<PrintStationResult> stations,
     @Default(false) bool isPrinting,
+
+    /// Order yang sedang dicetak, disimpan supaya station yang gagal bisa
+    /// diulang tanpa perlu dikirim ulang dari halaman pemanggil.
+    Order? order,
+
+    /// Naik tiap job baru dimulai. UI memakainya untuk tahu kapan harus
+    /// membuka dialog progres.
+    @Default(0) int jobId,
   }) = _PrintStruckState;
 
-  factory PrintStruckState.initial() =>
-      PrintStruckState(failureOrPrintStruck: none());
+  factory PrintStruckState.initial() => const PrintStruckState();
+
+  List<PrintStationResult> get failedStations =>
+      stations.where((station) => station.isFailed).toList();
+
+  bool get hasFailure => failedStations.isNotEmpty;
+
+  /// Station yang benar-benar dicetak — yang dilewati tidak ikut dihitung.
+  int get plannedCount =>
+      stations.where((station) => !station.isSkipped).length;
+
+  int get successCount =>
+      stations.where((station) => station.isSuccess).length;
 }

lib/application/printer/printer_form/printer_form_bloc.dart

@@ -117,6 +117,13 @@ class PrinterFormBloc extends Bloc<PrinterFormEvent, PrinterFormState> {
 
         final currentOutlet = await _outletRepository.currentOutlet();
 
+        // Ambil paper size dari DB, fallback ke state.paper jika belum tersimpan
+        final savedPrinter = await _printerRepository.getPrinterByCode(e.code);
+        final paper = savedPrinter.fold(
+          (_) => int.tryParse(state.paper) ?? 58,
+          (p) => int.tryParse(p.paper) ?? 58,
+        );
+
         List<int> printValue = [];
 
         if (e.code == "receipt") {
@@ -124,29 +131,34 @@ class PrinterFormBloc extends Bloc<PrinterFormEvent, PrinterFormState> {
             order: Order.mockOrder(),
             outlet: currentOutlet,
             cashierName: 'Kasir Test',
+            paper: paper,
           );
         } else if (e.code == "checker") {
           printValue = await PrintUi().printChecker(
             order: Order.mockOrder(),
             outlet: currentOutlet,
             cashierName: 'Kasir Test',
+            paper: paper,
           );
         } else if (e.code == 'kitchen') {
           printValue = await PrintUi().printKitchen(
             order: Order.mockOrder(),
             outlet: currentOutlet,
             cashierName: 'Kasir Test',
+            paper: paper,
           );
         } else if (e.code == 'bar') {
           printValue = await PrintUi().printBar(
             order: Order.mockOrder(),
             outlet: currentOutlet,
             cashierName: 'Kasir Test',
+            paper: paper,
           );
         } else if (e.code == 'ticket') {
           printValue = await PrintUi().printTicket(
             order: Order.mockOrder(),
             outlet: currentOutlet,
+            paper: paper,
           );
         }
 
@@ -154,7 +166,7 @@ class PrinterFormBloc extends Bloc<PrinterFormEvent, PrinterFormState> {
           code: e.code,
           name: state.name,
           address: e.macAccdress,
-          paper: state.paper,
+          paper: paper.toString(),
           type: state.type,
         );
 

lib/application/product/product_loader/product_loader_bloc.dart

@@ -43,7 +43,7 @@ class ProductLoaderBloc extends Bloc<ProductLoaderEvent, ProductLoaderState> {
             state.copyWith(
               isLoadingMore: false,
               failureOptionProduct: optionOf(
-                ProductFailure.dynamicErrorMessage(
+                const ProductFailure.dynamicErrorMessage(
                   'Database lokal belum siap. Silakan lakukan sinkronisasi data terlebih dahulu.',
                 ),
               ),

lib/application/refund/refund_form/refund_form_bloc.dart

@@ -2,6 +2,7 @@ import 'package:bloc/bloc.dart';
 import 'package:dartz/dartz.dart' hide Order;
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:injectable/injectable.dart' hide Order;
+import 'package:uuid/uuid.dart';
 
 import '../../../common/data/refund_data.dart';
 import '../../../domain/order/order.dart';
@@ -34,7 +35,15 @@ class RefundFormBloc extends Bloc<RefundFormEvent, RefundFormState> {
       submitted: (e) async {
         Either<OrderFailure, Unit>? failureOrRefund;
 
-        emit(state.copyWith(isSubmitting: true, failureOrRefund: none()));
+        // Generate new idempotency key saat user intent (tap Refund)
+        // Kalau sedang retry, pakai key yang sama
+        final idempotencyKey = state.idempotencyKey ?? const Uuid().v4();
+
+        emit(state.copyWith(
+          isSubmitting: true,
+          failureOrRefund: none(),
+          idempotencyKey: idempotencyKey,
+        ));
 
         failureOrRefund = await _repository.refundOrder(
           id: state.order.id,
@@ -42,12 +51,15 @@ class RefundFormBloc extends Bloc<RefundFormEvent, RefundFormState> {
               ? state.reason
               : state.refundReason?.value ?? '',
           refundAmount: state.order.totalAmount,
+          idempotencyKey: idempotencyKey,
         );
 
         emit(
           state.copyWith(
             isSubmitting: false,
             failureOrRefund: optionOf(failureOrRefund),
+            // Clear key on success, keep on failure for retry
+            idempotencyKey: failureOrRefund.isRight() ? null : idempotencyKey,
           ),
         );
       },

lib/application/refund/refund_form/refund_form_bloc.freezed.dart

@@ -692,6 +692,11 @@ mixin _$RefundFormState {
       throw _privateConstructorUsedError;
   bool get isSubmitting => throw _privateConstructorUsedError;
 
+  /// Idempotency key untuk refund submission.
+  /// Di-generate saat user tap "Refund", dipakai ulang saat retry,
+  /// di-clear setelah sukses.
+  String? get idempotencyKey => throw _privateConstructorUsedError;
+
   /// Create a copy of RefundFormState
   /// with the given fields replaced by the non-null parameter values.
   @JsonKey(includeFromJson: false, includeToJson: false)
@@ -712,6 +717,7 @@ abstract class $RefundFormStateCopyWith<$Res> {
     RefundReason? refundReason,
     Option<Either<OrderFailure, Unit>> failureOrRefund,
     bool isSubmitting,
+    String? idempotencyKey,
   });
 
   $OrderCopyWith<$Res> get order;
@@ -737,6 +743,7 @@ class _$RefundFormStateCopyWithImpl<$Res, $Val extends RefundFormState>
     Object? refundReason = freezed,
     Object? failureOrRefund = null,
     Object? isSubmitting = null,
+    Object? idempotencyKey = freezed,
   }) {
     return _then(
       _value.copyWith(
@@ -760,6 +767,10 @@ class _$RefundFormStateCopyWithImpl<$Res, $Val extends RefundFormState>
                 ? _value.isSubmitting
                 : isSubmitting // ignore: cast_nullable_to_non_nullable
                       as bool,
+            idempotencyKey: freezed == idempotencyKey
+                ? _value.idempotencyKey
+                : idempotencyKey // ignore: cast_nullable_to_non_nullable
+                      as String?,
           )
           as $Val,
     );
@@ -791,6 +802,7 @@ abstract class _$$RefundFormStateImplCopyWith<$Res>
     RefundReason? refundReason,
     Option<Either<OrderFailure, Unit>> failureOrRefund,
     bool isSubmitting,
+    String? idempotencyKey,
   });
 
   @override
@@ -816,6 +828,7 @@ class __$$RefundFormStateImplCopyWithImpl<$Res>
     Object? refundReason = freezed,
     Object? failureOrRefund = null,
     Object? isSubmitting = null,
+    Object? idempotencyKey = freezed,
   }) {
     return _then(
       _$RefundFormStateImpl(
@@ -839,6 +852,10 @@ class __$$RefundFormStateImplCopyWithImpl<$Res>
             ? _value.isSubmitting
             : isSubmitting // ignore: cast_nullable_to_non_nullable
                   as bool,
+        idempotencyKey: freezed == idempotencyKey
+            ? _value.idempotencyKey
+            : idempotencyKey // ignore: cast_nullable_to_non_nullable
+                  as String?,
       ),
     );
   }
@@ -853,6 +870,7 @@ class _$RefundFormStateImpl implements _RefundFormState {
     this.refundReason,
     required this.failureOrRefund,
     this.isSubmitting = false,
+    this.idempotencyKey,
   });
 
   @override
@@ -867,9 +885,15 @@ class _$RefundFormStateImpl implements _RefundFormState {
   @JsonKey()
   final bool isSubmitting;
 
+  /// Idempotency key untuk refund submission.
+  /// Di-generate saat user tap "Refund", dipakai ulang saat retry,
+  /// di-clear setelah sukses.
+  @override
+  final String? idempotencyKey;
+
   @override
   String toString() {
-    return 'RefundFormState(order: $order, reason: $reason, refundReason: $refundReason, failureOrRefund: $failureOrRefund, isSubmitting: $isSubmitting)';
+    return 'RefundFormState(order: $order, reason: $reason, refundReason: $refundReason, failureOrRefund: $failureOrRefund, isSubmitting: $isSubmitting, idempotencyKey: $idempotencyKey)';
   }
 
   @override
@@ -884,7 +908,9 @@ class _$RefundFormStateImpl implements _RefundFormState {
             (identical(other.failureOrRefund, failureOrRefund) ||
                 other.failureOrRefund == failureOrRefund) &&
             (identical(other.isSubmitting, isSubmitting) ||
-                other.isSubmitting == isSubmitting));
+                other.isSubmitting == isSubmitting) &&
+            (identical(other.idempotencyKey, idempotencyKey) ||
+                other.idempotencyKey == idempotencyKey));
   }
 
   @override
@@ -895,6 +921,7 @@ class _$RefundFormStateImpl implements _RefundFormState {
     refundReason,
     failureOrRefund,
     isSubmitting,
+    idempotencyKey,
   );
 
   /// Create a copy of RefundFormState
@@ -916,6 +943,7 @@ abstract class _RefundFormState implements RefundFormState {
     final RefundReason? refundReason,
     required final Option<Either<OrderFailure, Unit>> failureOrRefund,
     final bool isSubmitting,
+    final String? idempotencyKey,
   }) = _$RefundFormStateImpl;
 
   @override
@@ -929,6 +957,12 @@ abstract class _RefundFormState implements RefundFormState {
   @override
   bool get isSubmitting;
 
+  /// Idempotency key untuk refund submission.
+  /// Di-generate saat user tap "Refund", dipakai ulang saat retry,
+  /// di-clear setelah sukses.
+  @override
+  String? get idempotencyKey;
+
   /// Create a copy of RefundFormState
   /// with the given fields replaced by the non-null parameter values.
   @override

lib/application/refund/refund_form/refund_form_state.dart

@@ -8,6 +8,10 @@ class RefundFormState with _$RefundFormState {
     RefundReason? refundReason,
     required Option<Either<OrderFailure, Unit>> failureOrRefund,
     @Default(false) bool isSubmitting,
+    /// Idempotency key untuk refund submission.
+    /// Di-generate saat user tap "Refund", dipakai ulang saat retry,
+    /// di-clear setelah sukses.
+    String? idempotencyKey,
   }) = _RefundFormState;
 
   factory RefundFormState.initial() => RefundFormState(

lib/application/split_bill/split_bill_form/split_bill_form_bloc.dart

@@ -67,7 +67,11 @@ class SplitBillFormBloc extends Bloc<SplitBillFormEvent, SplitBillFormState> {
           final item = state.pendingItems.firstWhere(
             (item) => item.id == entry.key,
           );
-          newTotal += item.unitPrice.toInt() * entry.value;
+          // Baris berbobot dibayar utuh: nilainya weight x harga, bukan
+          // quantity x harga.
+          newTotal += item.isWeighted
+              ? item.totalPrice
+              : item.unitPrice.toInt() * entry.value;
         }
 
         emit(

lib/application/sync/sync_setting/sync_setting_bloc.dart

@@ -0,0 +1,245 @@
+import 'package:bloc/bloc.dart';
+import 'package:dartz/dartz.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:injectable/injectable.dart';
+
+import '../../../common/service/unit_registry.dart';
+import '../../../domain/category/category.dart';
+import '../../../domain/product/product.dart';
+
+part 'sync_setting_event.dart';
+part 'sync_setting_state.dart';
+part 'sync_setting_bloc.freezed.dart';
+
+@injectable
+class SyncSettingBloc extends Bloc<SyncSettingEvent, SyncSettingState> {
+  final IProductRepository _productRepository;
+  final ICategoryRepository _categoryRepository;
+  final UnitRegistry _unitRegistry;
+
+  SyncSettingBloc(
+    this._productRepository,
+    this._categoryRepository,
+    this._unitRegistry,
+  ) : super(SyncSettingState.initial()) {
+    on<SyncSettingEvent>(_onSyncSettingEvent);
+  }
+
+  Future<void> _onSyncSettingEvent(
+    SyncSettingEvent event,
+    Emitter<SyncSettingState> emit,
+  ) {
+    return event.map(
+      loadStats: (e) => _onLoadStats(emit),
+      syncAllData: (e) => _onSyncAllData(emit),
+      clearAllData: (e) => _onClearAllData(emit),
+      syncProducts: (e) => _onSyncProducts(emit),
+      syncCategories: (e) => _onSyncCategories(emit),
+      clearCategories: (e) => _onClearCategories(emit),
+      clearProducts: (e) => _onClearProducts(emit),
+    );
+  }
+
+  Future<void> _onLoadStats(Emitter<SyncSettingState> emit) async {
+    emit(
+      state.copyWith(
+        isLoading: true,
+        failureOptionProduct: none(),
+        failureOptionCategory: none(),
+      ),
+    );
+
+    final productStats = await _productRepository.getDatabaseStats();
+    final categoryStats = await _categoryRepository.getDatabaseStats();
+
+    productStats.fold(
+      (failure) {
+        emit(
+          state.copyWith(
+            isLoading: false,
+            failureOptionProduct: optionOf(failure),
+          ),
+        );
+      },
+      (data) {
+        emit(
+          state.copyWith(
+            isLoading: false,
+            productStats: data,
+            failureOptionProduct: none(),
+          ),
+        );
+      },
+    );
+
+    categoryStats.fold(
+      (failure) {
+        emit(
+          state.copyWith(
+            isLoading: false,
+            failureOptionCategory: optionOf(failure),
+          ),
+        );
+      },
+      (data) {
+        emit(
+          state.copyWith(
+            isLoading: false,
+            categoryStats: data,
+            failureOptionCategory: none(),
+          ),
+        );
+      },
+    );
+  }
+
+  Future<void> _onSyncAllData(Emitter<SyncSettingState> emit) async {
+    emit(
+      state.copyWith(
+        isSyncing: true,
+        failureOptionSyncCategory: none(),
+        failureOptionSyncProduct: none(),
+      ),
+    );
+
+    // Satuan lebih dulu: produk timbangan butuh singkatannya untuk bisa
+    // ditulis "4,2 ons" begitu selesai disinkronkan.
+    await _unitRegistry.load(forceRefresh: true);
+
+    // Sync categories first
+    final categoryResult = await _categoryRepository.syncAllCategories();
+
+    bool categorySuccess = false;
+    categoryResult.fold(
+      (failure) {
+        emit(
+          state.copyWith(failureOptionSyncCategory: optionOf(left(failure))),
+        );
+      },
+      (success) {
+        categorySuccess = true;
+        emit(
+          state.copyWith(failureOptionSyncCategory: optionOf(right(success))),
+        );
+      },
+    );
+
+    // Only sync products if categories synced successfully
+    if (categorySuccess) {
+      final productResult = await _productRepository.syncAllProducts();
+
+      productResult.fold(
+        (failure) {
+          emit(
+            state.copyWith(
+              isSyncing: false,
+              failureOptionSyncProduct: optionOf(left(failure)),
+            ),
+          );
+        },
+        (success) {
+          emit(
+            state.copyWith(
+              isSyncing: false,
+              failureOptionSyncProduct: optionOf(right(success)),
+            ),
+          );
+        },
+      );
+    } else {
+      emit(state.copyWith(isSyncing: false));
+    }
+
+    // Reload stats after sync
+    add(const SyncSettingEvent.loadStats());
+  }
+
+  Future<void> _onClearAllData(Emitter<SyncSettingState> emit) async {
+    emit(state.copyWith(isLoading: true));
+
+    try {
+      // Clear products and categories
+      await _productRepository.clearAllProducts();
+      await _categoryRepository.clearAllCategories();
+
+      // Clear caches
+      _productRepository.clearCache();
+      _categoryRepository.clearCache();
+
+      emit(state.copyWith(isLoading: false));
+
+      // Reload stats after clearing
+      add(const SyncSettingEvent.loadStats());
+    } catch (e) {
+      emit(state.copyWith(isLoading: false));
+    }
+  }
+
+  Future<void> _onSyncProducts(Emitter<SyncSettingState> emit) async {
+    emit(state.copyWith(isLoading: true, failureOptionSyncProduct: none()));
+
+    await _unitRegistry.load(forceRefresh: true);
+
+    final result = await _productRepository.syncAllProducts();
+
+    result.fold(
+      (failure) {
+        emit(
+          state.copyWith(
+            isLoading: false,
+            failureOptionSyncProduct: optionOf(left(failure)),
+          ),
+        );
+      },
+      (success) {
+        emit(
+          state.copyWith(
+            isLoading: false,
+            failureOptionSyncProduct: optionOf(right(success)),
+          ),
+        );
+      },
+    );
+
+    // Reload stats after sync
+    add(const SyncSettingEvent.loadStats());
+  }
+
+  Future<void> _onSyncCategories(Emitter<SyncSettingState> emit) async {
+    emit(state.copyWith(isLoading: true, failureOptionSyncCategory: none()));
+
+    final result = await _categoryRepository.syncAllCategories();
+
+    result.fold(
+      (failure) {
+        emit(
+          state.copyWith(
+            isLoading: false,
+            failureOptionSyncCategory: optionOf(left(failure)),
+          ),
+        );
+      },
+      (success) {
+        emit(
+          state.copyWith(
+            isLoading: false,
+            failureOptionSyncCategory: optionOf(right(success)),
+          ),
+        );
+      },
+    );
+
+    // Reload stats after sync
+    add(const SyncSettingEvent.loadStats());
+  }
+
+  Future<void> _onClearCategories(Emitter<SyncSettingState> emit) async {
+    await _categoryRepository.clearAllCategories();
+    _categoryRepository.clearCache();
+  }
+
+  Future<void> _onClearProducts(Emitter<SyncSettingState> emit) async {
+    await _productRepository.clearAllProducts();
+    _productRepository.clearCache();
+  }
+}

lib/application/sync/sync_setting/sync_setting_event.dart

@@ -0,0 +1,12 @@
+part of 'sync_setting_bloc.dart';
+
+@freezed
+class SyncSettingEvent with _$SyncSettingEvent {
+  const factory SyncSettingEvent.loadStats() = _LoadStats;
+  const factory SyncSettingEvent.syncAllData() = _SyncAllData;
+  const factory SyncSettingEvent.clearAllData() = _ClearAllData;
+  const factory SyncSettingEvent.syncProducts() = _SyncProducts;
+  const factory SyncSettingEvent.syncCategories() = _SyncCategories;
+  const factory SyncSettingEvent.clearCategories() = _ClearCategories;
+  const factory SyncSettingEvent.clearProducts() = _ClearProducts;
+}

lib/application/sync/sync_setting/sync_setting_state.dart

@@ -0,0 +1,24 @@
+part of 'sync_setting_bloc.dart';
+
+@freezed
+class SyncSettingState with _$SyncSettingState {
+  factory SyncSettingState({
+    required Map<String, dynamic> productStats,
+    required Map<String, dynamic> categoryStats,
+    required Option<CategoryFailure> failureOptionCategory,
+    required Option<ProductFailure> failureOptionProduct,
+    required Option<Either<ProductFailure, String>> failureOptionSyncProduct,
+    required Option<Either<CategoryFailure, String>> failureOptionSyncCategory,
+    @Default(false) bool isSyncing,
+    @Default(false) bool isLoading,
+  }) = _SyncSettingState;
+
+  factory SyncSettingState.initial() => SyncSettingState(
+    productStats: {},
+    categoryStats: {},
+    failureOptionCategory: none(),
+    failureOptionProduct: none(),
+    failureOptionSyncProduct: none(),
+    failureOptionSyncCategory: none(),
+  );
+}

lib/application/void/void_form/void_form_bloc.dart

@@ -1,7 +1,9 @@
 import 'package:bloc/bloc.dart';
+import 'package:collection/collection.dart';
 import 'package:dartz/dartz.dart' hide Order;
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:injectable/injectable.dart' hide Order;
+import 'package:uuid/uuid.dart';
 
 import '../../../common/types/void_type.dart';
 import '../../../domain/order/order.dart';
@@ -49,10 +51,14 @@ class VoidFormBloc extends Bloc<VoidFormEvent, VoidFormState> {
         // Recalculate total price
         int newTotal = 0;
         for (var entry in newQuantities.entries) {
-          final item = state.pendingItems.firstWhere(
+          final item = state.pendingItems.firstWhereOrNull(
             (item) => item.id == entry.key,
           );
-          newTotal += item.unitPrice.toInt() * entry.value;
+          if (item == null) continue;
+          // Baris berbobot di-void utuh; rupiahnya sudah weight x harga.
+          newTotal += item.isWeighted
+              ? item.totalPrice
+              : item.unitPrice.toInt() * entry.value;
         }
 
         emit(
@@ -71,21 +77,31 @@ class VoidFormBloc extends Bloc<VoidFormEvent, VoidFormState> {
 
         if (state.voidType.isItem) {
           state.selectedItemQuantities.forEach((itemId, voidQty) {
-            final originalItem = state.order.orderItems.firstWhere(
+            final originalItem = state.order.orderItems.firstWhereOrNull(
               (item) => item.id == itemId,
             );
 
+            if (originalItem == null) return;
+
             voidItems.add(
               OrderItem(
                 id: originalItem.id,
                 orderId: originalItem.orderId,
                 productId: originalItem.productId,
                 productName: originalItem.productName,
+                categoryId: originalItem.categoryId,
+                categoryName: originalItem.status,
                 productVariantId: originalItem.productVariantId,
                 productVariantName: originalItem.productVariantName,
                 quantity: voidQty,
                 unitPrice: originalItem.unitPrice,
-                totalPrice: (originalItem.unitPrice) * voidQty,
+                totalPrice: originalItem.isWeighted
+                    ? originalItem.totalPrice
+                    : (originalItem.unitPrice) * voidQty,
+                weight: originalItem.weight,
+                unitId: originalItem.unitId,
+                unitName: originalItem.unitName,
+                unitAbbreviation: originalItem.unitAbbreviation,
                 modifiers: originalItem.modifiers,
                 notes: originalItem.notes,
                 status: originalItem.status,
@@ -93,18 +109,28 @@ class VoidFormBloc extends Bloc<VoidFormEvent, VoidFormState> {
                 updatedAt: originalItem.updatedAt,
                 printerType: originalItem.printerType,
                 paidQuantity: originalItem.paidQuantity,
+                printToChecker: originalItem.printToChecker,
               ),
             );
           });
         }
 
-        emit(state.copyWith(isSubmitting: true, failureOrVoid: none()));
+        // Generate new idempotency key saat user intent (tap Void)
+        // Kalau sedang retry, pakai key yang sama
+        final idempotencyKey = state.idempotencyKey ?? const Uuid().v4();
+
+        emit(state.copyWith(
+          isSubmitting: true,
+          failureOrVoid: none(),
+          idempotencyKey: idempotencyKey,
+        ));
 
         failureOrVoid = await _repository.voidOrder(
           orderId: state.order.id,
           reason: state.voidReason ?? '',
           orderItems: voidItems,
           type: state.voidType.toStringType(),
+          idempotencyKey: idempotencyKey,
         );
 
         emit(
@@ -112,6 +138,8 @@ class VoidFormBloc extends Bloc<VoidFormEvent, VoidFormState> {
             isSubmitting: false,
             failureOrVoid: optionOf(failureOrVoid),
             voidItems: state.voidType.isItem ? voidItems : state.pendingItems,
+            // Clear key on success, keep on failure for retry
+            idempotencyKey: failureOrVoid.isRight() ? null : idempotencyKey,
           ),
         );
       },

lib/application/void/void_form/void_form_bloc.freezed.dart

@@ -1256,6 +1256,11 @@ mixin _$VoidFormState {
       throw _privateConstructorUsedError;
   bool get isSubmitting => throw _privateConstructorUsedError;
 
+  /// Idempotency key untuk void submission.
+  /// Di-generate saat user tap "Void", dipakai ulang saat retry,
+  /// di-clear setelah sukses atau clearState.
+  String? get idempotencyKey => throw _privateConstructorUsedError;
+
   /// Create a copy of VoidFormState
   /// with the given fields replaced by the non-null parameter values.
   @JsonKey(includeFromJson: false, includeToJson: false)
@@ -1280,6 +1285,7 @@ abstract class $VoidFormStateCopyWith<$Res> {
     int totalPriceVoid,
     Option<Either<OrderFailure, Unit>> failureOrVoid,
     bool isSubmitting,
+    String? idempotencyKey,
   });
 
   $OrderCopyWith<$Res> get order;
@@ -1309,6 +1315,7 @@ class _$VoidFormStateCopyWithImpl<$Res, $Val extends VoidFormState>
     Object? totalPriceVoid = null,
     Object? failureOrVoid = null,
     Object? isSubmitting = null,
+    Object? idempotencyKey = freezed,
   }) {
     return _then(
       _value.copyWith(
@@ -1348,6 +1355,10 @@ class _$VoidFormStateCopyWithImpl<$Res, $Val extends VoidFormState>
                 ? _value.isSubmitting
                 : isSubmitting // ignore: cast_nullable_to_non_nullable
                       as bool,
+            idempotencyKey: freezed == idempotencyKey
+                ? _value.idempotencyKey
+                : idempotencyKey // ignore: cast_nullable_to_non_nullable
+                      as String?,
           )
           as $Val,
     );
@@ -1383,6 +1394,7 @@ abstract class _$$VoidFormStateImplCopyWith<$Res>
     int totalPriceVoid,
     Option<Either<OrderFailure, Unit>> failureOrVoid,
     bool isSubmitting,
+    String? idempotencyKey,
   });
 
   @override
@@ -1412,6 +1424,7 @@ class __$$VoidFormStateImplCopyWithImpl<$Res>
     Object? totalPriceVoid = null,
     Object? failureOrVoid = null,
     Object? isSubmitting = null,
+    Object? idempotencyKey = freezed,
   }) {
     return _then(
       _$VoidFormStateImpl(
@@ -1451,6 +1464,10 @@ class __$$VoidFormStateImplCopyWithImpl<$Res>
             ? _value.isSubmitting
             : isSubmitting // ignore: cast_nullable_to_non_nullable
                   as bool,
+        idempotencyKey: freezed == idempotencyKey
+            ? _value.idempotencyKey
+            : idempotencyKey // ignore: cast_nullable_to_non_nullable
+                  as String?,
       ),
     );
   }
@@ -1469,6 +1486,7 @@ class _$VoidFormStateImpl implements _VoidFormState {
     required this.totalPriceVoid,
     required this.failureOrVoid,
     this.isSubmitting = false,
+    this.idempotencyKey,
   }) : _pendingItems = pendingItems,
        _voidItems = voidItems,
        _selectedItemQuantities = selectedItemQuantities;
@@ -1512,9 +1530,15 @@ class _$VoidFormStateImpl implements _VoidFormState {
   @JsonKey()
   final bool isSubmitting;
 
+  /// Idempotency key untuk void submission.
+  /// Di-generate saat user tap "Void", dipakai ulang saat retry,
+  /// di-clear setelah sukses atau clearState.
+  @override
+  final String? idempotencyKey;
+
   @override
   String toString() {
-    return 'VoidFormState(order: $order, pendingItems: $pendingItems, voidItems: $voidItems, voidType: $voidType, selectedItemQuantities: $selectedItemQuantities, voidReason: $voidReason, totalPriceVoid: $totalPriceVoid, failureOrVoid: $failureOrVoid, isSubmitting: $isSubmitting)';
+    return 'VoidFormState(order: $order, pendingItems: $pendingItems, voidItems: $voidItems, voidType: $voidType, selectedItemQuantities: $selectedItemQuantities, voidReason: $voidReason, totalPriceVoid: $totalPriceVoid, failureOrVoid: $failureOrVoid, isSubmitting: $isSubmitting, idempotencyKey: $idempotencyKey)';
   }
 
   @override
@@ -1544,7 +1568,9 @@ class _$VoidFormStateImpl implements _VoidFormState {
             (identical(other.failureOrVoid, failureOrVoid) ||
                 other.failureOrVoid == failureOrVoid) &&
             (identical(other.isSubmitting, isSubmitting) ||
-                other.isSubmitting == isSubmitting));
+                other.isSubmitting == isSubmitting) &&
+            (identical(other.idempotencyKey, idempotencyKey) ||
+                other.idempotencyKey == idempotencyKey));
   }
 
   @override
@@ -1559,6 +1585,7 @@ class _$VoidFormStateImpl implements _VoidFormState {
     totalPriceVoid,
     failureOrVoid,
     isSubmitting,
+    idempotencyKey,
   );
 
   /// Create a copy of VoidFormState
@@ -1581,6 +1608,7 @@ abstract class _VoidFormState implements VoidFormState {
     required final int totalPriceVoid,
     required final Option<Either<OrderFailure, Unit>> failureOrVoid,
     final bool isSubmitting,
+    final String? idempotencyKey,
   }) = _$VoidFormStateImpl;
 
   @override
@@ -1602,6 +1630,12 @@ abstract class _VoidFormState implements VoidFormState {
   @override
   bool get isSubmitting;
 
+  /// Idempotency key untuk void submission.
+  /// Di-generate saat user tap "Void", dipakai ulang saat retry,
+  /// di-clear setelah sukses atau clearState.
+  @override
+  String? get idempotencyKey;
+
   /// Create a copy of VoidFormState
   /// with the given fields replaced by the non-null parameter values.
   @override

lib/application/void/void_form/void_form_state.dart

@@ -12,6 +12,10 @@ class VoidFormState with _$VoidFormState {
     required int totalPriceVoid,
     required Option<Either<OrderFailure, Unit>> failureOrVoid,
     @Default(false) bool isSubmitting,
+    /// Idempotency key untuk void submission.
+    /// Di-generate saat user tap "Void", dipakai ulang saat retry,
+    /// di-clear setelah sukses atau clearState.
+    String? idempotencyKey,
   }) = _VoidFormState;
 
   factory VoidFormState.initial() => VoidFormState(

lib/common/api/api_client.dart

@@ -16,6 +16,7 @@ import 'interceptors/bad_network_interceptor.dart';
 import 'interceptors/bad_request_interceptor.dart';
 import 'interceptors/connection_timeout_interceptor.dart';
 import 'interceptors/crashlytic_interceptor.dart';
+import 'interceptors/idempotency_interceptor.dart';
 import 'interceptors/internal_server_interceptor.dart';
 import 'interceptors/not_found_interceptor.dart';
 import 'interceptors/unauthorized_interceptor.dart';
@@ -30,6 +31,7 @@ class ApiClient {
     _dio.options.connectTimeout = const Duration(seconds: 20);
     _dio.options.validateStatus = (status) =>
         status != null && status >= 200 && status < 500;
+    _dio.interceptors.add(IdempotencyInterceptor(_dio));
     _dio.interceptors.add(BadNetworkErrorInterceptor());
     _dio.interceptors.add(BadRequestErrorInterceptor());
     _dio.interceptors.add(InternalServerErrorInterceptor());

lib/common/api/interceptors/crashlytic_interceptor.dart

@@ -4,7 +4,6 @@ import 'package:firebase_crashlytics/firebase_crashlytics.dart';
 class CrashlyticsInterceptor extends Interceptor {
   @override
   void onError(DioException err, ErrorInterceptorHandler handler) {
-    // Log semua error ke Crashlytics
     FirebaseCrashlytics.instance.recordError(
       err,
       err.stackTrace,
@@ -46,6 +45,32 @@ class CrashlyticsInterceptor extends Interceptor {
       'Status Code: ${err.response?.statusCode ?? 'N/A'}',
       'Error Type: ${err.type.name}',
       'Message: ${err.message ?? 'No message'}',
+      // Tambahan
+      'Request Data: ${_sanitizeData(err.requestOptions.data)}',
+      'Response Body: ${err.response?.data ?? 'No response'}',
+      'Headers: ${err.requestOptions.headers.entries.where((e) => e.key.toLowerCase() != 'authorization').toList()}',
     ];
   }
+
+  /// Hindari log data sensitif
+  dynamic _sanitizeData(dynamic data) {
+    if (data == null) return 'No data';
+    if (data is Map) {
+      final sanitized = Map.from(data);
+      const sensitiveKeys = [
+        'password',
+        'token',
+        'secret',
+        'pin',
+        'card_number',
+      ];
+      for (final key in sensitiveKeys) {
+        if (sanitized.containsKey(key)) {
+          sanitized[key] = '***';
+        }
+      }
+      return sanitized;
+    }
+    return data;
+  }
 }

lib/common/api/interceptors/idempotency_interceptor.dart

@@ -0,0 +1,104 @@
+import 'package:dio/dio.dart';
+import 'package:uuid/uuid.dart';
+
+/// Interceptor yang secara otomatis menambahkan header X-Idempotency-Key
+/// untuk endpoint-endpoint kritis yang memerlukan idempotency.
+///
+/// Key sebaiknya di-generate di level BLoC/Cubit saat user trigger action,
+/// lalu dikirim via headers. Interceptor ini hanya berfungsi sebagai fallback
+/// jika key belum di-set.
+///
+/// Jika response 409 dengan error code `request_in_progress`, interceptor
+/// akan retry setelah delay 1-2 detik.
+class IdempotencyInterceptor extends Interceptor {
+  static const _headerKey = 'X-Idempotency-Key';
+  static const _replayHeader = 'X-Idempotent-Replay';
+
+  // Endpoints that require idempotency keys (exact match)
+  static const _idempotentPaths = [
+    '/api/v1/payments',
+    '/api/v1/orders/void',
+  ];
+
+  // Endpoints that require idempotency keys (pattern match)
+  static final _idempotentPathPatterns = [
+    RegExp(r'/api/v1/orders/.+/add-items$'),
+    RegExp(r'/api/v1/orders/.+/refund$'),
+    RegExp(r'/api/v1/payments/.+/refund$'),
+  ];
+
+  static const _maxRetries = 3;
+  static const _retryDelay = Duration(seconds: 2);
+
+  final Dio _dio;
+
+  IdempotencyInterceptor(this._dio);
+
+  @override
+  void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
+    if (options.method == 'POST' && _requiresIdempotencyKey(options.path)) {
+      // Gunakan key yang sudah di-set dari BLoC, atau generate baru sebagai fallback
+      options.headers[_headerKey] ??= const Uuid().v4();
+    }
+    handler.next(options);
+  }
+
+  @override
+  void onResponse(Response response, ResponseInterceptorHandler handler) {
+    // Log jika response adalah replay dari request sebelumnya
+    final isReplay = response.headers.value(_replayHeader);
+    if (isReplay == 'true') {
+      // Response ini adalah hasil dari request pertama yang sudah diproses.
+      // Treat as success — tidak perlu perlakuan khusus.
+    }
+    handler.next(response);
+  }
+
+  @override
+  void onError(DioException err, ErrorInterceptorHandler handler) async {
+    final response = err.response;
+    final options = err.requestOptions;
+
+    if (response == null) {
+      handler.next(err);
+      return;
+    }
+
+    // Handle 409 Conflict with request_in_progress
+    if (response.statusCode == 409 &&
+        _isRequestInProgress(response.data) &&
+        _requiresIdempotencyKey(options.path)) {
+      final retryCount = options.extra['_idempotency_retry_count'] ?? 0;
+
+      if (retryCount < _maxRetries) {
+        await Future.delayed(_retryDelay);
+
+        options.extra['_idempotency_retry_count'] = retryCount + 1;
+
+        try {
+          final retryResponse = await _dio.fetch(options);
+          handler.resolve(retryResponse);
+        } on DioException catch (e) {
+          handler.next(e);
+        }
+        return;
+      }
+    }
+
+    handler.next(err);
+  }
+
+  bool _requiresIdempotencyKey(String path) {
+    if (_idempotentPaths.any((p) => path.endsWith(p))) return true;
+    if (_idempotentPathPatterns.any((r) => r.hasMatch(path))) return true;
+    return false;
+  }
+
+  bool _isRequestInProgress(dynamic data) {
+    if (data is Map<String, dynamic>) {
+      final errorCode = data['error_code'] ?? data['code'] ?? '';
+      return errorCode == 'request_in_progress';
+    }
+    return false;
+  }
+}

lib/common/constant/app_constant.dart

@@ -1,5 +1,8 @@
+import '../../env.dart';
+import '../../injection.dart';
+
 class AppConstant {
   static const String appName = "Apskel POS";
-  static const String dbName = "apskel_pos.db";
+  static String dbName = getIt<Env>().dbName;
   static const int cacheExpire = 10; // in minutes
 }

lib/common/constant/local_storage_key.dart

@@ -2,4 +2,5 @@ class LocalStorageKey {
   static const String token = 'token';
   static const String user = 'user';
   static const String outlet = 'outlet';
+  static const String units = 'units';
 }

lib/common/database/database_helper.dart

@@ -17,7 +17,7 @@ class DatabaseHelper {
 
     return await openDatabase(
       path,
-      version: 2, // Updated version for categories table
+      version: 3,
       onCreate: _onCreate,
       onUpgrade: _onUpgrade,
     );
@@ -38,10 +38,15 @@ class DatabaseHelper {
         business_type TEXT,
         image_url TEXT,
         printer_type TEXT,
+        print_to_checker INTEGER DEFAULT 0,
         metadata TEXT,
         is_active INTEGER,
         created_at TEXT,
-        updated_at TEXT
+        updated_at TEXT,
+        sell_by TEXT DEFAULT 'unit',
+        unit_id TEXT,
+        unit_name TEXT,
+        unit_abbreviation TEXT
       )
     ''');
 
@@ -68,6 +73,7 @@ class DatabaseHelper {
         name TEXT NOT NULL,
         description TEXT,
         business_type TEXT,
+        sort_order INTEGER DEFAULT 0,
         metadata TEXT,
         is_active INTEGER DEFAULT 1,
         created_at TEXT,
@@ -109,9 +115,20 @@ class DatabaseHelper {
   Future<void> _onUpgrade(Database db, int oldVersion, int newVersion) async {
     if (oldVersion < 2) {
       await db.execute(
-        'ALTER TABLE categories ADD COLUMN "order" INTEGER DEFAULT 0',
+        'ALTER TABLE products ADD COLUMN print_to_checker INTEGER DEFAULT 0',
       );
     }
+
+    // Produk timbangan: cara jual dan satuan ikut disimpan lokal supaya POS
+    // tetap bisa menampilkan "4,2 ons" saat offline.
+    if (oldVersion < 3) {
+      await db.execute(
+        "ALTER TABLE products ADD COLUMN sell_by TEXT DEFAULT 'unit'",
+      );
+      await db.execute('ALTER TABLE products ADD COLUMN unit_id TEXT');
+      await db.execute('ALTER TABLE products ADD COLUMN unit_name TEXT');
+      await db.execute('ALTER TABLE products ADD COLUMN unit_abbreviation TEXT');
+    }
   }
 
   Future<void> close() async {

lib/common/di/di_firebase.dart

@@ -0,0 +1,21 @@
+import 'package:device_info_plus/device_info_plus.dart';
+import 'package:firebase_messaging/firebase_messaging.dart';
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:injectable/injectable.dart';
+import 'package:package_info_plus/package_info_plus.dart';
+
+@module
+abstract class FirebaseDi {
+  @lazySingleton
+  FirebaseMessaging get messaging => FirebaseMessaging.instance;
+
+  @lazySingleton
+  FlutterLocalNotificationsPlugin get localNotifications =>
+      FlutterLocalNotificationsPlugin();
+
+  @lazySingleton
+  DeviceInfoPlugin get deviceInfo => DeviceInfoPlugin();
+
+  @preResolve
+  Future<PackageInfo> get packageInfo => PackageInfo.fromPlatform();
+}

lib/common/extension/double_extension.dart

@@ -13,3 +13,10 @@ extension DoubleExt on double {
     decimalDigits: 0,
   ).format(this);
 }
+
+extension WeightExt on double {
+  /// Format berat gaya Indonesia: koma desimal, tanpa nol di belakang.
+  /// `4.2` → `4,2`, `4.237` → `4,237`, `5.0` → `5`.
+  String get weightFormat =>
+      NumberFormat('#,##0.###', 'id').format(this);
+}

lib/common/function/app_function.dart

@@ -75,3 +75,25 @@ int generateRandomNumber() {
   final random = Random();
   return 1 + random.nextInt(10000);
 }
+
+/// Ambil pesan validasi dari amplop error standar backend.
+///
+/// Untuk produk timbangan pesannya menyebut nama produk — misalnya
+/// "product Ikan Tude is sold by weight and requires a weight" — jadi layak
+/// ditampilkan apa adanya ke kasir alih-alih diganti pesan generik.
+String? extractApiErrorCause(dynamic responseData) {
+  if (responseData is! Map) return null;
+
+  final errors = responseData['errors'];
+  if (errors is! List || errors.isEmpty) return null;
+
+  final causes = errors
+      .whereType<Map>()
+      .map((e) => (e['cause'] ?? e['message'])?.toString())
+      .where((cause) => cause != null && cause.isNotEmpty)
+      .cast<String>()
+      .toList();
+
+  if (causes.isEmpty) return null;
+  return causes.join('\n');
+}

lib/common/service/device_info_service.dart

@@ -0,0 +1,64 @@
+import 'dart:io';
+
+import 'package:device_info_plus/device_info_plus.dart';
+import 'package:injectable/injectable.dart';
+import 'package:package_info_plus/package_info_plus.dart';
+
+@lazySingleton
+class DeviceInfoService {
+  DeviceInfoService(this._deviceInfo, this._packageInfo);
+
+  final DeviceInfoPlugin _deviceInfo;
+  final PackageInfo _packageInfo;
+
+  String get appVersion => '${_packageInfo.version}+${_packageInfo.buildNumber}';
+
+  Future<Map<String, String>> getDevicePayload() async {
+    final info = await _getDeviceInfo();
+    return {
+      'device_id': info['device_id'] ?? '',
+      'device_name': info['device_name'] ?? '',
+      'device_type': info['device_type'] ?? 'mobile',
+      'platform': _getPlatform(),
+      'app_version': appVersion,
+      'os_version': info['os_version'] ?? '',
+    };
+  }
+
+  String _getPlatform() {
+    if (Platform.isAndroid) return 'android';
+    if (Platform.isIOS) return 'ios';
+    return 'web';
+  }
+
+  Future<Map<String, String>> _getDeviceInfo() async {
+    if (Platform.isAndroid) {
+      final android = await _deviceInfo.androidInfo;
+      return {
+        'device_id': android.id,
+        'device_name': '${android.manufacturer} ${android.model}',
+        'device_type': _resolveDeviceType(android.model),
+        'os_version': 'Android ${android.version.release} (SDK ${android.version.sdkInt})',
+      };
+    } else if (Platform.isIOS) {
+      final ios = await _deviceInfo.iosInfo;
+      return {
+        'device_id': ios.identifierForVendor ?? '',
+        'device_name': ios.name,
+        'device_type': _resolveDeviceType(ios.model),
+        'os_version': '${ios.systemName} ${ios.systemVersion}',
+      };
+    }
+    return {'device_type': 'desktop'};
+  }
+
+  /// Deteksi device_type berdasarkan nama model
+  /// Nilai valid: mobile | tablet | desktop
+  String _resolveDeviceType(String model) {
+    final lower = model.toLowerCase();
+    if (lower.contains('tablet') || lower.contains('tab') || lower.contains('ipad')) {
+      return 'tablet';
+    }
+    return 'mobile';
+  }
+}

lib/common/service/fcm_service.dart

@@ -0,0 +1,196 @@
+import 'dart:developer';
+
+import 'package:firebase_messaging/firebase_messaging.dart';
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:injectable/injectable.dart';
+
+/// Background message handler — harus top-level function
+@pragma('vm:entry-point')
+Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
+  log('[FCM] Background message: ${message.messageId}');
+}
+
+@lazySingleton
+class FcmService {
+  FcmService(this._messaging, this._localNotifications);
+
+  final FirebaseMessaging _messaging;
+  final FlutterLocalNotificationsPlugin _localNotifications;
+
+  /// Inisialisasi FCM: minta permission, set handler, ambil token
+  Future<void> initialize() async {
+    // Setup local notifications
+    await _setupLocalNotifications();
+
+    // Register background handler
+    FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);
+
+    // Minta permission notifikasi (iOS & Android 13+)
+    final settings = await _messaging.requestPermission(
+      alert: true,
+      badge: true,
+      sound: true,
+      provisional: false,
+    );
+
+    log('[FCM] Permission status: ${settings.authorizationStatus}');
+
+    if (settings.authorizationStatus == AuthorizationStatus.authorized ||
+        settings.authorizationStatus == AuthorizationStatus.provisional) {
+      await _setupTokenHandling();
+      _setupForegroundHandler();
+      _setupOpenedAppHandler();
+    }
+  }
+
+  Future<void> _setupLocalNotifications() async {
+    const androidSettings = AndroidInitializationSettings('@drawable/ic_notification');
+    const iosSettings = DarwinInitializationSettings(
+      requestAlertPermission: true,
+      requestBadgePermission: true,
+      requestSoundPermission: true,
+    );
+
+    const initSettings = InitializationSettings(
+      android: androidSettings,
+      iOS: iosSettings,
+    );
+
+    await _localNotifications.initialize(
+      initSettings,
+      onDidReceiveNotificationResponse: _onNotificationTapped,
+    );
+
+    // Android notification channel
+    const channel = AndroidNotificationChannel(
+      'high_importance_channel',
+      'High Importance Notifications',
+      description: 'This channel is used for important notifications.',
+      importance: Importance.high,
+      playSound: true,
+    );
+
+    await _localNotifications
+        .resolvePlatformSpecificImplementation<
+            AndroidFlutterLocalNotificationsPlugin>()
+        ?.createNotificationChannel(channel);
+  }
+
+  void _onNotificationTapped(NotificationResponse response) {
+    log('[FCM] Notification tapped: ${response.payload}');
+    // TODO: handle navigation berdasarkan payload
+  }
+
+  Future<void> _setupTokenHandling() async {
+    final token = await getToken();
+    log('========================================');
+    log('[FCM] TOKEN: $token');
+    log('========================================');
+    // TODO: kirim token ke server jika diperlukan
+
+    _messaging.onTokenRefresh.listen((newToken) {
+      log('========================================');
+      log('[FCM] TOKEN REFRESHED: $newToken');
+      log('========================================');
+      // TODO: kirim token baru ke server jika diperlukan
+    });
+  }
+
+  void _setupForegroundHandler() {
+    FirebaseMessaging.onMessage.listen((RemoteMessage message) {
+      log('[FCM] Foreground message: ${message.messageId}');
+      log('[FCM] Title: ${message.notification?.title}');
+      log('[FCM] Body: ${message.notification?.body}');
+      log('[FCM] Data: ${message.data}');
+
+      // Tampilkan notifikasi lokal saat app di foreground
+      final notification = message.notification;
+      if (notification != null) {
+        _showLocalNotification(
+          id: message.hashCode,
+          title: notification.title ?? '',
+          body: notification.body ?? '',
+          payload: message.data.toString(),
+        );
+      }
+    });
+  }
+
+  void _setupOpenedAppHandler() {
+    // App dibuka dari notifikasi saat terminated
+    _messaging.getInitialMessage().then((RemoteMessage? message) {
+      if (message != null) {
+        log('[FCM] App opened from terminated via: ${message.messageId}');
+        _handleMessageNavigation(message);
+      }
+    });
+
+    // App dibuka dari notifikasi saat background
+    FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message) {
+      log('[FCM] App opened from background via: ${message.messageId}');
+      _handleMessageNavigation(message);
+    });
+  }
+
+  void _handleMessageNavigation(RemoteMessage message) {
+    // TODO: tambahkan logika navigasi berdasarkan message.data
+    log('[FCM] Handle navigation for: ${message.data}');
+  }
+
+  Future<void> _showLocalNotification({
+    required int id,
+    required String title,
+    required String body,
+    String? payload,
+  }) async {
+    const androidDetails = AndroidNotificationDetails(
+      'high_importance_channel',
+      'High Importance Notifications',
+      channelDescription: 'This channel is used for important notifications.',
+      importance: Importance.max,
+      priority: Priority.max,
+      showWhen: true,
+      playSound: true,
+      enableVibration: true,
+      enableLights: true,
+      fullScreenIntent: true,
+      icon: 'ic_notification',
+    );
+
+    const iosDetails = DarwinNotificationDetails(
+      presentAlert: true,
+      presentBadge: true,
+      presentSound: true,
+    );
+
+    const details = NotificationDetails(
+      android: androidDetails,
+      iOS: iosDetails,
+    );
+
+    await _localNotifications.show(id, title, body, details, payload: payload);
+    log('[FCM] Local notification shown: $title');
+  }
+
+  /// Ambil FCM token perangkat
+  Future<String?> getToken() async {
+    try {
+      return await _messaging.getToken();
+    } catch (e) {
+      log('[FCM] Failed to get token: $e');
+      return null;
+    }
+  }
+
+  /// Subscribe ke topic tertentu
+  Future<void> subscribeToTopic(String topic) async {
+    await _messaging.subscribeToTopic(topic);
+    log('[FCM] Subscribed to topic: $topic');
+  }
+
+  /// Unsubscribe dari topic tertentu
+  Future<void> unsubscribeFromTopic(String topic) async {
+    await _messaging.unsubscribeFromTopic(topic);
+    log('[FCM] Unsubscribed from topic: $topic');
+  }
+}

lib/common/service/unit_registry.dart

@@ -0,0 +1,48 @@
+import 'dart:developer';
+
+import 'package:injectable/injectable.dart';
+
+import '../../domain/unit/unit.dart';
+
+/// Kamus satuan yang dipakai untuk menerjemahkan `unit_id` sebuah produk
+/// menjadi singkatan yang dicetak di keranjang dan struk (`4,2 ons`).
+///
+/// Response produk hanya dijamin membawa `unit_id`; nama dan singkatannya
+/// datang dari `GET /api/v1/units`. Registry ini menjembatani keduanya tanpa
+/// memaksa setiap pemanggil menunggu request.
+@lazySingleton
+class UnitRegistry {
+  final IUnitRepository _repository;
+  final _logName = 'UnitRegistry';
+
+  Map<String, ProductUnit> _unitsById = {};
+
+  UnitRegistry(this._repository);
+
+  bool get isEmpty => _unitsById.isEmpty;
+
+  ProductUnit? byId(String? id) {
+    if (id == null || id.isEmpty) return null;
+    return _unitsById[id];
+  }
+
+  String abbreviationOf(String? id) => byId(id)?.abbreviation ?? '';
+
+  String nameOf(String? id) => byId(id)?.name ?? '';
+
+  /// Muat satuan ke memori. Aman dipanggil berulang; [forceRefresh] menembak
+  /// server ulang saat pengguna melakukan sinkronisasi manual.
+  Future<void> load({bool forceRefresh = false}) async {
+    final result = await _repository.getUnits(forceRefresh: forceRefresh);
+
+    result.fold(
+      (failure) => log('⚠️ Gagal memuat satuan: $failure', name: _logName),
+      (units) {
+        _unitsById = {for (final unit in units) unit.id: unit};
+        log('📏 ${units.length} satuan siap dipakai', name: _logName);
+      },
+    );
+  }
+
+  void clear() => _unitsById = {};
+}

lib/common/theme/app_style.dart

@@ -1,27 +1,27 @@
 part of 'theme.dart';
 
 class AppStyle {
-  static TextStyle xs = TextStyle(color: AppColor.black, fontSize: 11);
+  static TextStyle xs = const TextStyle(color: AppColor.black, fontSize: 11);
 
-  static TextStyle sm = TextStyle(color: AppColor.black, fontSize: 12);
+  static TextStyle sm = const TextStyle(color: AppColor.black, fontSize: 12);
 
-  static TextStyle md = TextStyle(color: AppColor.black, fontSize: 14);
+  static TextStyle md = const TextStyle(color: AppColor.black, fontSize: 14);
 
-  static TextStyle lg = TextStyle(color: AppColor.black, fontSize: 16);
+  static TextStyle lg = const TextStyle(color: AppColor.black, fontSize: 16);
 
-  static TextStyle xl = TextStyle(color: AppColor.black, fontSize: 18);
+  static TextStyle xl = const TextStyle(color: AppColor.black, fontSize: 18);
 
-  static TextStyle xxl = TextStyle(color: AppColor.black, fontSize: 20);
+  static TextStyle xxl = const TextStyle(color: AppColor.black, fontSize: 20);
 
-  static TextStyle h6 = TextStyle(color: AppColor.black, fontSize: 22);
+  static TextStyle h6 = const TextStyle(color: AppColor.black, fontSize: 22);
 
-  static TextStyle h5 = TextStyle(color: AppColor.black, fontSize: 24);
+  static TextStyle h5 = const TextStyle(color: AppColor.black, fontSize: 24);
 
-  static TextStyle h4 = TextStyle(color: AppColor.black, fontSize: 26);
+  static TextStyle h4 = const TextStyle(color: AppColor.black, fontSize: 26);
 
-  static TextStyle h3 = TextStyle(color: AppColor.black, fontSize: 28);
+  static TextStyle h3 = const TextStyle(color: AppColor.black, fontSize: 28);
 
-  static TextStyle h2 = TextStyle(color: AppColor.black, fontSize: 30);
+  static TextStyle h2 = const TextStyle(color: AppColor.black, fontSize: 30);
 
-  static TextStyle h1 = TextStyle(color: AppColor.black, fontSize: 32);
+  static TextStyle h1 = const TextStyle(color: AppColor.black, fontSize: 32);
 }

lib/common/theme/app_value.dart

@@ -1,5 +1,3 @@
 part of 'theme.dart';
 
-class AppValue {
-  // TODO: define value
-}
+class AppValue {}

lib/common/theme/theme.dart

@@ -11,7 +11,7 @@ class ThemeApp {
     useMaterial3: true,
     primaryColor: AppColor.primary,
     scaffoldBackgroundColor: AppColor.white,
-    appBarTheme: AppBarTheme(
+    appBarTheme: const AppBarTheme(
       color: AppColor.white,
       elevation: 0,
       titleTextStyle: TextStyle(
@@ -19,7 +19,7 @@ class ThemeApp {
         fontSize: 16.0,
         fontWeight: FontWeight.w500,
       ),
-      iconTheme: const IconThemeData(color: AppColor.primary),
+      iconTheme: IconThemeData(color: AppColor.primary),
     ),
     fontFamily: FontFamily.quicksand,
     colorScheme: ColorScheme.fromSeed(seedColor: AppColor.primary),
@@ -28,19 +28,19 @@ class ThemeApp {
       hintStyle: const TextStyle(color: AppColor.textSecondary),
       border: OutlineInputBorder(
         borderRadius: BorderRadius.circular(8.0),
-        borderSide: BorderSide(color: AppColor.borderDark),
+        borderSide: const BorderSide(color: AppColor.borderDark),
       ),
       focusedBorder: OutlineInputBorder(
         borderRadius: BorderRadius.circular(8.0),
-        borderSide: BorderSide(color: AppColor.primary),
+        borderSide: const BorderSide(color: AppColor.primary),
       ),
       enabledBorder: OutlineInputBorder(
         borderRadius: BorderRadius.circular(8.0),
-        borderSide: BorderSide(color: AppColor.borderDark),
+        borderSide: const BorderSide(color: AppColor.borderDark),
       ),
       errorBorder: OutlineInputBorder(
         borderRadius: BorderRadius.circular(8.0),
-        borderSide: BorderSide(color: AppColor.error),
+        borderSide: const BorderSide(color: AppColor.error),
       ),
     ),
   );

lib/common/types/sell_by.dart

@@ -0,0 +1,19 @@
+/// Cara sebuah produk dijual.
+///
+/// Lihat `docs/integration-weight-based-products.md` — backend hanya menerima
+/// dua nilai ini, dan produk lama otomatis dianggap [SellBy.unit].
+class SellBy {
+  const SellBy._();
+
+  /// Dijual per cacah. `quantity` integer, `weight` tidak dikirim.
+  static const String unit = 'unit';
+
+  /// Dijual per timbangan. `quantity` selalu 1, `weight` wajib.
+  static const String weight = 'weight';
+
+  static bool isWeight(String? value) => value == weight;
+
+  /// Nilai apa pun di luar dua yang dikenal diperlakukan sebagai [unit],
+  /// sama seperti perilaku backend untuk produk lama.
+  static String normalize(String? value) => value == weight ? weight : unit;
+}

lib/common/url/api_path.dart

@@ -1,8 +1,10 @@
 class ApiPath {
   static const String login = '/api/v1/auth/login';
+  static const String logout = '/api/v1/auth/logout';
   static const String outlets = '/api/v1/outlets';
   static const String categories = '/api/v1/categories';
   static const String products = '/api/v1/products';
+  static const String units = '/api/v1/units';
   static const String tables = '/api/v1/tables';
   static const String customers = '/api/v1/customers';
   static const String paymentMethods = '/api/v1/payment-methods';

lib/domain/analytic/entities/product_analytic_entity.dart

@@ -89,6 +89,7 @@ class ProductAnalyticCategoryItem with _$ProductAnalyticCategoryItem {
     required int totalRevenue,
   }) = _ProductAnalyticCategoryItem;
 
+  // ignore: prefer_const_constructors
   factory ProductAnalyticCategoryItem.empty() => ProductAnalyticCategoryItem(
     categoryName: '',
     productCount: 0,

lib/domain/auth/repositories/i_auth_repository.dart

@@ -4,7 +4,10 @@ abstract class IAuthRepository {
   Future<Either<AuthFailure, Login>> login({
     required String email,
     required String password,
+    required Map<String, String> devicePayload,
+    required String fcmToken,
   });
+  Future<Either<AuthFailure, Unit>> logout();
   Future<bool> hasToken();
   Future<Either<AuthFailure, User>> currentUser();
 }

lib/domain/customer/entities/customer_entity.dart

@@ -10,8 +10,8 @@ class ListCustomer with _$ListCustomer {
     required int totalPages,
   }) = _ListCustomer;
 
-  factory ListCustomer.empty() => ListCustomer(
-    customers: const [],
+  factory ListCustomer.empty() => const ListCustomer(
+    customers: [],
     totalCount: 0,
     page: 0,
     limit: 0,

lib/domain/order/entities/add_item_order_request_entity.dart

@@ -8,13 +8,26 @@ class AddItemOrderRequest with _$AddItemOrderRequest {
     required int quantity,
     required int unitPrice,
     required String notes,
+
+    /// Hanya diisi untuk produk `sell_by: "weight"`.
+    double? weight,
   }) = _AddItemOrderRequest;
 
-  factory AddItemOrderRequest.empty() => AddItemOrderRequest(
+  factory AddItemOrderRequest.empty() => const AddItemOrderRequest(
     productId: '',
     productVariantId: '',
     quantity: 0,
     unitPrice: 0,
     notes: '',
   );
+
+  factory AddItemOrderRequest.fromProductQuantity(ProductQuantity item) =>
+      AddItemOrderRequest(
+        productId: item.product.id,
+        productVariantId: item.variant?.id ?? '',
+        quantity: item.isWeighted ? 1 : item.quantity,
+        unitPrice: item.product.price.toInt(),
+        notes: item.notes,
+        weight: item.weight,
+      );
 }

lib/domain/order/entities/order_entity.dart

@@ -10,12 +10,19 @@ class ListOrder with _$ListOrder {
     required int totalPages,
   }) = _ListOrder;
 
-  factory ListOrder.empty() =>
-      ListOrder(orders: [], totalCount: 0, page: 0, limit: 0, totalPages: 0);
+  factory ListOrder.empty() => const ListOrder(
+    orders: [],
+    totalCount: 0,
+    page: 0,
+    limit: 0,
+    totalPages: 0,
+  );
 }
 
 @freezed
 class Order with _$Order {
+  const Order._();
+
   const factory Order({
     required String id,
     required String orderNumber,
@@ -118,7 +125,10 @@ class Order with _$Order {
         createdAt: DateTime.now().subtract(const Duration(hours: 1)),
         updatedAt: DateTime.now(),
         printerType: 'Barista',
+        printToChecker: false,
         paidQuantity: 2,
+        categoryId: 'CAT-001',
+        categoryName: 'Minuman',
       ),
       OrderItem(
         id: 'ITEM-002',
@@ -136,7 +146,31 @@ class Order with _$Order {
         createdAt: DateTime.now().subtract(const Duration(hours: 1)),
         updatedAt: DateTime.now(),
         printerType: 'Kitchen',
+        printToChecker: false,
         paidQuantity: 1,
+        categoryId: 'CAT-002',
+        categoryName: 'Makanan',
+      ),
+       OrderItem(
+        id: 'ITEM-003',
+        orderId: 'ORD-001',
+        productId: 'PROD-003',
+        productName: 'Pasta',
+        productVariantId: 'VAR-002',
+        productVariantName: '',
+        quantity: 1,
+        unitPrice: 50000,
+        totalPrice: 50000,
+        modifiers: [],
+        notes: '',
+        status: 'Served',
+        createdAt: DateTime.now().subtract(const Duration(hours: 1)),
+        updatedAt: DateTime.now(),
+        printerType: 'Kitchen',
+        printToChecker: false,
+        paidQuantity: 1,
+        categoryId: 'CAT-002',
+        categoryName: 'Makanan',
       ),
     ],
     payments: [
@@ -161,10 +195,30 @@ class Order with _$Order {
     paymentCount: 1,
     splitType: 'Single',
   );
+
+  // For Add Item Order
+  factory Order.fromLastOrder(Order order, List<ProductQuantity> products) {
+    final subtotal = products.fold<int>(
+      0,
+      (sum, item) => sum + item.lineTotal.toInt(),
+    );
+
+    return order.copyWith(
+      orderItems: products.map(OrderItem.fromProductQuantity).toList(),
+      totalAmount: subtotal,
+      subtotal: subtotal,
+      metadata: order.metadata,
+    );
+  }
+
+  List<OrderItem> get orderItemNotCancelled =>
+      orderItems.where((item) => item.status != 'cancelled').toList();
 }
 
 @freezed
 class OrderItem with _$OrderItem {
+  const OrderItem._();
+
   const factory OrderItem({
     required String id,
     required String orderId,
@@ -181,7 +235,16 @@ class OrderItem with _$OrderItem {
     required DateTime createdAt,
     required DateTime updatedAt,
     required String printerType,
+    required bool printToChecker,
     required int paidQuantity,
+    required String categoryId,
+    required String categoryName,
+
+    /// Angka timbangan baris ini. `null` untuk produk cacah.
+    double? weight,
+    @Default('') String unitId,
+    @Default('') String unitName,
+    @Default('') String unitAbbreviation,
   }) = _OrderItem;
 
   factory OrderItem.empty() => OrderItem(
@@ -200,6 +263,57 @@ class OrderItem with _$OrderItem {
     createdAt: DateTime(1970),
     updatedAt: DateTime(1970),
     printerType: '',
+    printToChecker: false,
     paidQuantity: 0,
+    categoryId: '',
+    categoryName: '',
   );
+
+  factory OrderItem.fromProductQuantity(ProductQuantity productQuantity) =>
+      OrderItem(
+        id: '',
+        orderId: '',
+        productId: productQuantity.product.id,
+        productName: productQuantity.product.name,
+        productVariantId: productQuantity.variant?.id ?? '',
+        productVariantName: productQuantity.variant?.name ?? '',
+        quantity: productQuantity.isWeighted ? 1 : productQuantity.quantity,
+        unitPrice: productQuantity.product.price.toInt(),
+        totalPrice: productQuantity.lineTotal.toInt(),
+        modifiers: [],
+        notes: productQuantity.notes,
+        status: 'pending',
+        createdAt: DateTime.now(),
+        updatedAt: DateTime.now(),
+        printerType: productQuantity.product.printerType,
+        printToChecker: productQuantity.product.printToChecker,
+        paidQuantity: 0,
+        categoryId: '',
+        categoryName: '',
+        weight: productQuantity.weight,
+        unitId: productQuantity.product.unitId,
+        unitName: productQuantity.product.unitName,
+        unitAbbreviation: productQuantity.product.unitAbbreviation,
+      );
+
+  /// Baris hasil penimbangan — utuh, tidak bisa dipecah sebagian.
+  bool get isWeighted => weight != null && weight! > 0;
+
+  /// Singkatan satuan untuk ditampilkan; jatuh ke nama panjang bila kosong.
+  String get unitLabel =>
+      unitAbbreviation.isNotEmpty ? unitAbbreviation : unitName;
+
+  /// `4,2 ons` untuk baris berbobot, `2` untuk baris biasa.
+  ///
+  /// Jangan menampilkan [quantity] mentah pada baris berbobot — nilainya selalu
+  /// 1 dan terbaca seperti "satu ons".
+  String get quantityLabel {
+    if (!isWeighted) return quantity.toString();
+    final value = weight!.weightFormat;
+    return unitLabel.isEmpty ? value : '$value $unitLabel';
+  }
+
+  /// `4,2 ons x Rp 4.500` atau `2 x Rp 25.000`.
+  String get quantityPriceLabel =>
+      '$quantityLabel x ${unitPrice.currencyFormatRpV2}';
 }

lib/domain/order/entities/order_request_entity.dart

@@ -33,6 +33,10 @@ class OrderItemRequest with _$OrderItemRequest {
     required int quantity,
     required int unitPrice,
     required String notes,
+
+    /// Hanya diisi untuk produk `sell_by: "weight"`; produk cacah tidak boleh
+    /// mengirim berat sama sekali.
+    double? weight,
   }) = _OrderItemRequest;
 
   factory OrderItemRequest.empty() => const OrderItemRequest(
@@ -42,4 +46,16 @@ class OrderItemRequest with _$OrderItemRequest {
     unitPrice: 0,
     notes: '',
   );
+
+  /// Bentuk baris dari isi keranjang: produk timbangan selalu `quantity: 1`
+  /// ditambah `weight`, produk cacah tetap seperti sebelumnya.
+  factory OrderItemRequest.fromProductQuantity(ProductQuantity item) =>
+      OrderItemRequest(
+        productId: item.product.id,
+        productVariantId: item.variant?.id ?? '',
+        quantity: item.isWeighted ? 1 : item.quantity,
+        unitPrice: item.product.price.toInt(),
+        notes: item.notes,
+        weight: item.weight,
+      );
 }

lib/domain/order/order.dart

@@ -3,6 +3,8 @@ import 'package:freezed_annotation/freezed_annotation.dart';
 
 import '../../common/api/api_failure.dart';
 import '../../common/types/split_type.dart';
+import '../../common/extension/extension.dart';
+import '../product/product.dart';
 
 part 'order.freezed.dart';
 

lib/domain/order/order.freezed.dart

@@ -681,7 +681,7 @@ class __$$OrderImplCopyWithImpl<$Res>
 
 /// @nodoc
 
-class _$OrderImpl implements _Order {
+class _$OrderImpl extends _Order {
   const _$OrderImpl({
     required this.id,
     required this.orderNumber,
@@ -712,7 +712,8 @@ class _$OrderImpl implements _Order {
     required this.splitType,
   }) : _metadata = metadata,
        _orderItems = orderItems,
-       _payments = payments;
+       _payments = payments,
+       super._();
 
   @override
   final String id;
@@ -889,7 +890,7 @@ class _$OrderImpl implements _Order {
       __$$OrderImplCopyWithImpl<_$OrderImpl>(this, _$identity);
 }
 
-abstract class _Order implements Order {
+abstract class _Order extends Order {
   const factory _Order({
     required final String id,
     required final String orderNumber,
@@ -919,6 +920,7 @@ abstract class _Order implements Order {
     required final int paymentCount,
     required final String splitType,
   }) = _$OrderImpl;
+  const _Order._() : super._();
 
   @override
   String get id;
@@ -1000,7 +1002,16 @@ mixin _$OrderItem {
   DateTime get createdAt => throw _privateConstructorUsedError;
   DateTime get updatedAt => throw _privateConstructorUsedError;
   String get printerType => throw _privateConstructorUsedError;
+  bool get printToChecker => throw _privateConstructorUsedError;
   int get paidQuantity => throw _privateConstructorUsedError;
+  String get categoryId => throw _privateConstructorUsedError;
+  String get categoryName => throw _privateConstructorUsedError;
+
+  /// Angka timbangan baris ini. `null` untuk produk cacah.
+  double? get weight => throw _privateConstructorUsedError;
+  String get unitId => throw _privateConstructorUsedError;
+  String get unitName => throw _privateConstructorUsedError;
+  String get unitAbbreviation => throw _privateConstructorUsedError;
 
   /// Create a copy of OrderItem
   /// with the given fields replaced by the non-null parameter values.
@@ -1030,7 +1041,14 @@ abstract class $OrderItemCopyWith<$Res> {
     DateTime createdAt,
     DateTime updatedAt,
     String printerType,
+    bool printToChecker,
     int paidQuantity,
+    String categoryId,
+    String categoryName,
+    double? weight,
+    String unitId,
+    String unitName,
+    String unitAbbreviation,
   });
 }
 
@@ -1064,7 +1082,14 @@ class _$OrderItemCopyWithImpl<$Res, $Val extends OrderItem>
     Object? createdAt = null,
     Object? updatedAt = null,
     Object? printerType = null,
+    Object? printToChecker = null,
     Object? paidQuantity = null,
+    Object? categoryId = null,
+    Object? categoryName = null,
+    Object? weight = freezed,
+    Object? unitId = null,
+    Object? unitName = null,
+    Object? unitAbbreviation = null,
   }) {
     return _then(
       _value.copyWith(
@@ -1128,10 +1153,38 @@ class _$OrderItemCopyWithImpl<$Res, $Val extends OrderItem>
                 ? _value.printerType
                 : printerType // ignore: cast_nullable_to_non_nullable
                       as String,
+            printToChecker: null == printToChecker
+                ? _value.printToChecker
+                : printToChecker // ignore: cast_nullable_to_non_nullable
+                      as bool,
             paidQuantity: null == paidQuantity
                 ? _value.paidQuantity
                 : paidQuantity // ignore: cast_nullable_to_non_nullable
                       as int,
+            categoryId: null == categoryId
+                ? _value.categoryId
+                : categoryId // ignore: cast_nullable_to_non_nullable
+                      as String,
+            categoryName: null == categoryName
+                ? _value.categoryName
+                : categoryName // ignore: cast_nullable_to_non_nullable
+                      as String,
+            weight: freezed == weight
+                ? _value.weight
+                : weight // ignore: cast_nullable_to_non_nullable
+                      as double?,
+            unitId: null == unitId
+                ? _value.unitId
+                : unitId // ignore: cast_nullable_to_non_nullable
+                      as String,
+            unitName: null == unitName
+                ? _value.unitName
+                : unitName // ignore: cast_nullable_to_non_nullable
+                      as String,
+            unitAbbreviation: null == unitAbbreviation
+                ? _value.unitAbbreviation
+                : unitAbbreviation // ignore: cast_nullable_to_non_nullable
+                      as String,
           )
           as $Val,
     );
@@ -1163,7 +1216,14 @@ abstract class _$$OrderItemImplCopyWith<$Res>
     DateTime createdAt,
     DateTime updatedAt,
     String printerType,
+    bool printToChecker,
     int paidQuantity,
+    String categoryId,
+    String categoryName,
+    double? weight,
+    String unitId,
+    String unitName,
+    String unitAbbreviation,
   });
 }
 
@@ -1196,7 +1256,14 @@ class __$$OrderItemImplCopyWithImpl<$Res>
     Object? createdAt = null,
     Object? updatedAt = null,
     Object? printerType = null,
+    Object? printToChecker = null,
     Object? paidQuantity = null,
+    Object? categoryId = null,
+    Object? categoryName = null,
+    Object? weight = freezed,
+    Object? unitId = null,
+    Object? unitName = null,
+    Object? unitAbbreviation = null,
   }) {
     return _then(
       _$OrderItemImpl(
@@ -1260,10 +1327,38 @@ class __$$OrderItemImplCopyWithImpl<$Res>
             ? _value.printerType
             : printerType // ignore: cast_nullable_to_non_nullable
                   as String,
+        printToChecker: null == printToChecker
+            ? _value.printToChecker
+            : printToChecker // ignore: cast_nullable_to_non_nullable
+                  as bool,
         paidQuantity: null == paidQuantity
             ? _value.paidQuantity
             : paidQuantity // ignore: cast_nullable_to_non_nullable
                   as int,
+        categoryId: null == categoryId
+            ? _value.categoryId
+            : categoryId // ignore: cast_nullable_to_non_nullable
+                  as String,
+        categoryName: null == categoryName
+            ? _value.categoryName
+            : categoryName // ignore: cast_nullable_to_non_nullable
+                  as String,
+        weight: freezed == weight
+            ? _value.weight
+            : weight // ignore: cast_nullable_to_non_nullable
+                  as double?,
+        unitId: null == unitId
+            ? _value.unitId
+            : unitId // ignore: cast_nullable_to_non_nullable
+                  as String,
+        unitName: null == unitName
+            ? _value.unitName
+            : unitName // ignore: cast_nullable_to_non_nullable
+                  as String,
+        unitAbbreviation: null == unitAbbreviation
+            ? _value.unitAbbreviation
+            : unitAbbreviation // ignore: cast_nullable_to_non_nullable
+                  as String,
       ),
     );
   }
@@ -1271,7 +1366,7 @@ class __$$OrderItemImplCopyWithImpl<$Res>
 
 /// @nodoc
 
-class _$OrderItemImpl implements _OrderItem {
+class _$OrderItemImpl extends _OrderItem {
   const _$OrderItemImpl({
     required this.id,
     required this.orderId,
@@ -1288,8 +1383,16 @@ class _$OrderItemImpl implements _OrderItem {
     required this.createdAt,
     required this.updatedAt,
     required this.printerType,
+    required this.printToChecker,
     required this.paidQuantity,
-  }) : _modifiers = modifiers;
+    required this.categoryId,
+    required this.categoryName,
+    this.weight,
+    this.unitId = '',
+    this.unitName = '',
+    this.unitAbbreviation = '',
+  }) : _modifiers = modifiers,
+       super._();
 
   @override
   final String id;
@@ -1328,11 +1431,30 @@ class _$OrderItemImpl implements _OrderItem {
   @override
   final String printerType;
   @override
+  final bool printToChecker;
+  @override
   final int paidQuantity;
+  @override
+  final String categoryId;
+  @override
+  final String categoryName;
+
+  /// Angka timbangan baris ini. `null` untuk produk cacah.
+  @override
+  final double? weight;
+  @override
+  @JsonKey()
+  final String unitId;
+  @override
+  @JsonKey()
+  final String unitName;
+  @override
+  @JsonKey()
+  final String unitAbbreviation;
 
   @override
   String toString() {
-    return 'OrderItem(id: $id, orderId: $orderId, productId: $productId, productName: $productName, productVariantId: $productVariantId, productVariantName: $productVariantName, quantity: $quantity, unitPrice: $unitPrice, totalPrice: $totalPrice, modifiers: $modifiers, notes: $notes, status: $status, createdAt: $createdAt, updatedAt: $updatedAt, printerType: $printerType, paidQuantity: $paidQuantity)';
+    return 'OrderItem(id: $id, orderId: $orderId, productId: $productId, productName: $productName, productVariantId: $productVariantId, productVariantName: $productVariantName, quantity: $quantity, unitPrice: $unitPrice, totalPrice: $totalPrice, modifiers: $modifiers, notes: $notes, status: $status, createdAt: $createdAt, updatedAt: $updatedAt, printerType: $printerType, printToChecker: $printToChecker, paidQuantity: $paidQuantity, categoryId: $categoryId, categoryName: $categoryName, weight: $weight, unitId: $unitId, unitName: $unitName, unitAbbreviation: $unitAbbreviation)';
   }
 
   @override
@@ -1368,12 +1490,24 @@ class _$OrderItemImpl implements _OrderItem {
                 other.updatedAt == updatedAt) &&
             (identical(other.printerType, printerType) ||
                 other.printerType == printerType) &&
+            (identical(other.printToChecker, printToChecker) ||
+                other.printToChecker == printToChecker) &&
             (identical(other.paidQuantity, paidQuantity) ||
-                other.paidQuantity == paidQuantity));
+                other.paidQuantity == paidQuantity) &&
+            (identical(other.categoryId, categoryId) ||
+                other.categoryId == categoryId) &&
+            (identical(other.categoryName, categoryName) ||
+                other.categoryName == categoryName) &&
+            (identical(other.weight, weight) || other.weight == weight) &&
+            (identical(other.unitId, unitId) || other.unitId == unitId) &&
+            (identical(other.unitName, unitName) ||
+                other.unitName == unitName) &&
+            (identical(other.unitAbbreviation, unitAbbreviation) ||
+                other.unitAbbreviation == unitAbbreviation));
   }
 
   @override
-  int get hashCode => Object.hash(
+  int get hashCode => Object.hashAll([
     runtimeType,
     id,
     orderId,
@@ -1390,8 +1524,15 @@ class _$OrderItemImpl implements _OrderItem {
     createdAt,
     updatedAt,
     printerType,
+    printToChecker,
     paidQuantity,
-  );
+    categoryId,
+    categoryName,
+    weight,
+    unitId,
+    unitName,
+    unitAbbreviation,
+  ]);
 
   /// Create a copy of OrderItem
   /// with the given fields replaced by the non-null parameter values.
@@ -1402,7 +1543,7 @@ class _$OrderItemImpl implements _OrderItem {
       __$$OrderItemImplCopyWithImpl<_$OrderItemImpl>(this, _$identity);
 }
 
-abstract class _OrderItem implements OrderItem {
+abstract class _OrderItem extends OrderItem {
   const factory _OrderItem({
     required final String id,
     required final String orderId,
@@ -1419,8 +1560,16 @@ abstract class _OrderItem implements OrderItem {
     required final DateTime createdAt,
     required final DateTime updatedAt,
     required final String printerType,
+    required final bool printToChecker,
     required final int paidQuantity,
+    required final String categoryId,
+    required final String categoryName,
+    final double? weight,
+    final String unitId,
+    final String unitName,
+    final String unitAbbreviation,
   }) = _$OrderItemImpl;
+  const _OrderItem._() : super._();
 
   @override
   String get id;
@@ -1453,7 +1602,23 @@ abstract class _OrderItem implements OrderItem {
   @override
   String get printerType;
   @override
+  bool get printToChecker;
+  @override
   int get paidQuantity;
+  @override
+  String get categoryId;
+  @override
+  String get categoryName;
+
+  /// Angka timbangan baris ini. `null` untuk produk cacah.
+  @override
+  double? get weight;
+  @override
+  String get unitId;
+  @override
+  String get unitName;
+  @override
+  String get unitAbbreviation;
 
   /// Create a copy of OrderItem
   /// with the given fields replaced by the non-null parameter values.
@@ -1779,6 +1944,10 @@ mixin _$OrderItemRequest {
   int get unitPrice => throw _privateConstructorUsedError;
   String get notes => throw _privateConstructorUsedError;
 
+  /// Hanya diisi untuk produk `sell_by: "weight"`; produk cacah tidak boleh
+  /// mengirim berat sama sekali.
+  double? get weight => throw _privateConstructorUsedError;
+
   /// Create a copy of OrderItemRequest
   /// with the given fields replaced by the non-null parameter values.
   @JsonKey(includeFromJson: false, includeToJson: false)
@@ -1799,6 +1968,7 @@ abstract class $OrderItemRequestCopyWith<$Res> {
     int quantity,
     int unitPrice,
     String notes,
+    double? weight,
   });
 }
 
@@ -1822,6 +1992,7 @@ class _$OrderItemRequestCopyWithImpl<$Res, $Val extends OrderItemRequest>
     Object? quantity = null,
     Object? unitPrice = null,
     Object? notes = null,
+    Object? weight = freezed,
   }) {
     return _then(
       _value.copyWith(
@@ -1845,6 +2016,10 @@ class _$OrderItemRequestCopyWithImpl<$Res, $Val extends OrderItemRequest>
                 ? _value.notes
                 : notes // ignore: cast_nullable_to_non_nullable
                       as String,
+            weight: freezed == weight
+                ? _value.weight
+                : weight // ignore: cast_nullable_to_non_nullable
+                      as double?,
           )
           as $Val,
     );
@@ -1866,6 +2041,7 @@ abstract class _$$OrderItemRequestImplCopyWith<$Res>
     int quantity,
     int unitPrice,
     String notes,
+    double? weight,
   });
 }
 
@@ -1888,6 +2064,7 @@ class __$$OrderItemRequestImplCopyWithImpl<$Res>
     Object? quantity = null,
     Object? unitPrice = null,
     Object? notes = null,
+    Object? weight = freezed,
   }) {
     return _then(
       _$OrderItemRequestImpl(
@@ -1911,6 +2088,10 @@ class __$$OrderItemRequestImplCopyWithImpl<$Res>
             ? _value.notes
             : notes // ignore: cast_nullable_to_non_nullable
                   as String,
+        weight: freezed == weight
+            ? _value.weight
+            : weight // ignore: cast_nullable_to_non_nullable
+                  as double?,
       ),
     );
   }
@@ -1925,6 +2106,7 @@ class _$OrderItemRequestImpl implements _OrderItemRequest {
     required this.quantity,
     required this.unitPrice,
     required this.notes,
+    this.weight,
   });
 
   @override
@@ -1938,9 +2120,14 @@ class _$OrderItemRequestImpl implements _OrderItemRequest {
   @override
   final String notes;
 
+  /// Hanya diisi untuk produk `sell_by: "weight"`; produk cacah tidak boleh
+  /// mengirim berat sama sekali.
+  @override
+  final double? weight;
+
   @override
   String toString() {
-    return 'OrderItemRequest(productId: $productId, productVariantId: $productVariantId, quantity: $quantity, unitPrice: $unitPrice, notes: $notes)';
+    return 'OrderItemRequest(productId: $productId, productVariantId: $productVariantId, quantity: $quantity, unitPrice: $unitPrice, notes: $notes, weight: $weight)';
   }
 
   @override
@@ -1956,7 +2143,8 @@ class _$OrderItemRequestImpl implements _OrderItemRequest {
                 other.quantity == quantity) &&
             (identical(other.unitPrice, unitPrice) ||
                 other.unitPrice == unitPrice) &&
-            (identical(other.notes, notes) || other.notes == notes));
+            (identical(other.notes, notes) || other.notes == notes) &&
+            (identical(other.weight, weight) || other.weight == weight));
   }
 
   @override
@@ -1967,6 +2155,7 @@ class _$OrderItemRequestImpl implements _OrderItemRequest {
     quantity,
     unitPrice,
     notes,
+    weight,
   );
 
   /// Create a copy of OrderItemRequest
@@ -1988,6 +2177,7 @@ abstract class _OrderItemRequest implements OrderItemRequest {
     required final int quantity,
     required final int unitPrice,
     required final String notes,
+    final double? weight,
   }) = _$OrderItemRequestImpl;
 
   @override
@@ -2001,6 +2191,11 @@ abstract class _OrderItemRequest implements OrderItemRequest {
   @override
   String get notes;
 
+  /// Hanya diisi untuk produk `sell_by: "weight"`; produk cacah tidak boleh
+  /// mengirim berat sama sekali.
+  @override
+  double? get weight;
+
   /// Create a copy of OrderItemRequest
   /// with the given fields replaced by the non-null parameter values.
   @override
@@ -3380,6 +3575,9 @@ mixin _$AddItemOrderRequest {
   int get unitPrice => throw _privateConstructorUsedError;
   String get notes => throw _privateConstructorUsedError;
 
+  /// Hanya diisi untuk produk `sell_by: "weight"`.
+  double? get weight => throw _privateConstructorUsedError;
+
   /// Create a copy of AddItemOrderRequest
   /// with the given fields replaced by the non-null parameter values.
   @JsonKey(includeFromJson: false, includeToJson: false)
@@ -3400,6 +3598,7 @@ abstract class $AddItemOrderRequestCopyWith<$Res> {
     int quantity,
     int unitPrice,
     String notes,
+    double? weight,
   });
 }
 
@@ -3423,6 +3622,7 @@ class _$AddItemOrderRequestCopyWithImpl<$Res, $Val extends AddItemOrderRequest>
     Object? quantity = null,
     Object? unitPrice = null,
     Object? notes = null,
+    Object? weight = freezed,
   }) {
     return _then(
       _value.copyWith(
@@ -3446,6 +3646,10 @@ class _$AddItemOrderRequestCopyWithImpl<$Res, $Val extends AddItemOrderRequest>
                 ? _value.notes
                 : notes // ignore: cast_nullable_to_non_nullable
                       as String,
+            weight: freezed == weight
+                ? _value.weight
+                : weight // ignore: cast_nullable_to_non_nullable
+                      as double?,
           )
           as $Val,
     );
@@ -3467,6 +3671,7 @@ abstract class _$$AddItemOrderRequestImplCopyWith<$Res>
     int quantity,
     int unitPrice,
     String notes,
+    double? weight,
   });
 }
 
@@ -3489,6 +3694,7 @@ class __$$AddItemOrderRequestImplCopyWithImpl<$Res>
     Object? quantity = null,
     Object? unitPrice = null,
     Object? notes = null,
+    Object? weight = freezed,
   }) {
     return _then(
       _$AddItemOrderRequestImpl(
@@ -3512,6 +3718,10 @@ class __$$AddItemOrderRequestImplCopyWithImpl<$Res>
             ? _value.notes
             : notes // ignore: cast_nullable_to_non_nullable
                   as String,
+        weight: freezed == weight
+            ? _value.weight
+            : weight // ignore: cast_nullable_to_non_nullable
+                  as double?,
       ),
     );
   }
@@ -3526,6 +3736,7 @@ class _$AddItemOrderRequestImpl implements _AddItemOrderRequest {
     required this.quantity,
     required this.unitPrice,
     required this.notes,
+    this.weight,
   });
 
   @override
@@ -3539,9 +3750,13 @@ class _$AddItemOrderRequestImpl implements _AddItemOrderRequest {
   @override
   final String notes;
 
+  /// Hanya diisi untuk produk `sell_by: "weight"`.
+  @override
+  final double? weight;
+
   @override
   String toString() {
-    return 'AddItemOrderRequest(productId: $productId, productVariantId: $productVariantId, quantity: $quantity, unitPrice: $unitPrice, notes: $notes)';
+    return 'AddItemOrderRequest(productId: $productId, productVariantId: $productVariantId, quantity: $quantity, unitPrice: $unitPrice, notes: $notes, weight: $weight)';
   }
 
   @override
@@ -3557,7 +3772,8 @@ class _$AddItemOrderRequestImpl implements _AddItemOrderRequest {
                 other.quantity == quantity) &&
             (identical(other.unitPrice, unitPrice) ||
                 other.unitPrice == unitPrice) &&
-            (identical(other.notes, notes) || other.notes == notes));
+            (identical(other.notes, notes) || other.notes == notes) &&
+            (identical(other.weight, weight) || other.weight == weight));
   }
 
   @override
@@ -3568,6 +3784,7 @@ class _$AddItemOrderRequestImpl implements _AddItemOrderRequest {
     quantity,
     unitPrice,
     notes,
+    weight,
   );
 
   /// Create a copy of AddItemOrderRequest
@@ -3589,6 +3806,7 @@ abstract class _AddItemOrderRequest implements AddItemOrderRequest {
     required final int quantity,
     required final int unitPrice,
     required final String notes,
+    final double? weight,
   }) = _$AddItemOrderRequestImpl;
 
   @override
@@ -3602,6 +3820,10 @@ abstract class _AddItemOrderRequest implements AddItemOrderRequest {
   @override
   String get notes;
 
+  /// Hanya diisi untuk produk `sell_by: "weight"`.
+  @override
+  double? get weight;
+
   /// Create a copy of AddItemOrderRequest
   /// with the given fields replaced by the non-null parameter values.
   @override

lib/domain/order/repositories/i_order_repository.dart

@@ -24,10 +24,12 @@ abstract class IOrderRepository {
   Future<Either<OrderFailure, Order>> addItemOrder({
     required String id,
     required List<AddItemOrderRequest> request,
+    String? idempotencyKey,
   });
 
   Future<Either<OrderFailure, Payment>> createPayment({
     required PaymentRequest request,
+    String? idempotencyKey,
   });
 
   Future<Either<OrderFailure, Unit>> voidOrder({
@@ -35,15 +37,18 @@ abstract class IOrderRepository {
     required String reason,
     String type = "ITEM", // TYPE: ALL, ITEM
     required List<OrderItem> orderItems,
+    String? idempotencyKey,
   });
 
   Future<Either<OrderFailure, Payment>> createSplitBill(
-    PaymentSplitBillRequest request,
-  );
+    PaymentSplitBillRequest request, {
+    String? idempotencyKey,
+  });
 
   Future<Either<OrderFailure, Unit>> refundOrder({
     required String id,
     required String reason,
     required int refundAmount,
+    String? idempotencyKey,
   });
 }

lib/domain/payment_method/entities/payment_method_entity.dart

@@ -10,7 +10,7 @@ class ListPaymentMethod with _$ListPaymentMethod {
     required int totalPages,
   }) = _ListPaymentMethod;
 
-  factory ListPaymentMethod.empty() => ListPaymentMethod(
+  factory ListPaymentMethod.empty() => const ListPaymentMethod(
     paymentMethods: [],
     totalCount: 0,
     page: 0,

lib/domain/printer/entities/print_station_result.dart

@@ -0,0 +1,83 @@
+part of '../printer.dart';
+
+/// Satu tujuan cetak dalam sekali proses print.
+///
+/// Perhatikan kasir, void, dan split bill sengaja menumpang printer `receipt`
+/// — ketiganya tidak punya printer sendiri di halaman pengaturan.
+enum PrintStation {
+  receipt,
+  cashier,
+  checker,
+  kitchen,
+  bar,
+  voided,
+  splitBill;
+
+  String get label => switch (this) {
+    PrintStation.receipt => 'Struk Customer',
+    PrintStation.cashier => 'Struk Kasir',
+    PrintStation.checker => 'Checker',
+    PrintStation.kitchen => 'Kitchen',
+    PrintStation.bar => 'Bar',
+    PrintStation.voided => 'Struk Void',
+    PrintStation.splitBill => 'Struk Split Bill',
+  };
+
+  /// Kode printer di tabel `printers`.
+  String get printerCode => switch (this) {
+    PrintStation.receipt ||
+    PrintStation.cashier ||
+    PrintStation.voided ||
+    PrintStation.splitBill => 'receipt',
+    PrintStation.checker => 'checker',
+    PrintStation.kitchen => 'kitchen',
+    PrintStation.bar => 'bar',
+  };
+
+  /// Station yang hanya mencetak item dengan `printerType` tertentu.
+  /// Station lain mencetak seluruh item order.
+  String? get itemPrinterType => switch (this) {
+    PrintStation.kitchen => 'kitchen',
+    PrintStation.bar => 'bar',
+    _ => null,
+  };
+
+}
+
+enum PrintStationStatus {
+  /// Belum dijalankan.
+  pending,
+
+  /// Sedang dikirim ke printer.
+  printing,
+
+  /// Berhasil dicetak.
+  success,
+
+  /// Gagal — lihat `message`.
+  failed,
+
+  /// Sengaja dilewati, misal tidak ada item untuk station tersebut.
+  /// Ini bukan kegagalan dan tidak perlu dicetak ulang.
+  skipped,
+}
+
+@freezed
+class PrintStationResult with _$PrintStationResult {
+  const PrintStationResult._();
+
+  const factory PrintStationResult({
+    required PrintStation station,
+    required PrintStationStatus status,
+    String? message,
+    @Default(Duration.zero) Duration elapsed,
+  }) = _PrintStationResult;
+
+  factory PrintStationResult.pending(PrintStation station) =>
+      PrintStationResult(station: station, status: PrintStationStatus.pending);
+
+  bool get isSuccess => status == PrintStationStatus.success;
+  bool get isFailed => status == PrintStationStatus.failed;
+  bool get isSkipped => status == PrintStationStatus.skipped;
+  bool get isFinished => isSuccess || isFailed || isSkipped;
+}

lib/domain/printer/printer.dart

@@ -9,5 +9,6 @@ import '../order/order.dart';
 part 'printer.freezed.dart';
 
 part 'entities/printer_entity.dart';
+part 'entities/print_station_result.dart';
 part 'failures/printer_failure.dart';
 part 'repositories/i_printer_repository.dart';

lib/domain/printer/printer.freezed.dart

@@ -307,6 +307,216 @@ abstract class _Printer implements Printer {
       throw _privateConstructorUsedError;
 }
 
+/// @nodoc
+mixin _$PrintStationResult {
+  PrintStation get station => throw _privateConstructorUsedError;
+  PrintStationStatus get status => throw _privateConstructorUsedError;
+  String? get message => throw _privateConstructorUsedError;
+  Duration get elapsed => throw _privateConstructorUsedError;
+
+  /// Create a copy of PrintStationResult
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $PrintStationResultCopyWith<PrintStationResult> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $PrintStationResultCopyWith<$Res> {
+  factory $PrintStationResultCopyWith(
+    PrintStationResult value,
+    $Res Function(PrintStationResult) then,
+  ) = _$PrintStationResultCopyWithImpl<$Res, PrintStationResult>;
+  @useResult
+  $Res call({
+    PrintStation station,
+    PrintStationStatus status,
+    String? message,
+    Duration elapsed,
+  });
+}
+
+/// @nodoc
+class _$PrintStationResultCopyWithImpl<$Res, $Val extends PrintStationResult>
+    implements $PrintStationResultCopyWith<$Res> {
+  _$PrintStationResultCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of PrintStationResult
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? station = null,
+    Object? status = null,
+    Object? message = freezed,
+    Object? elapsed = null,
+  }) {
+    return _then(
+      _value.copyWith(
+            station: null == station
+                ? _value.station
+                : station // ignore: cast_nullable_to_non_nullable
+                      as PrintStation,
+            status: null == status
+                ? _value.status
+                : status // ignore: cast_nullable_to_non_nullable
+                      as PrintStationStatus,
+            message: freezed == message
+                ? _value.message
+                : message // ignore: cast_nullable_to_non_nullable
+                      as String?,
+            elapsed: null == elapsed
+                ? _value.elapsed
+                : elapsed // ignore: cast_nullable_to_non_nullable
+                      as Duration,
+          )
+          as $Val,
+    );
+  }
+}
+
+/// @nodoc
+abstract class _$$PrintStationResultImplCopyWith<$Res>
+    implements $PrintStationResultCopyWith<$Res> {
+  factory _$$PrintStationResultImplCopyWith(
+    _$PrintStationResultImpl value,
+    $Res Function(_$PrintStationResultImpl) then,
+  ) = __$$PrintStationResultImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call({
+    PrintStation station,
+    PrintStationStatus status,
+    String? message,
+    Duration elapsed,
+  });
+}
+
+/// @nodoc
+class __$$PrintStationResultImplCopyWithImpl<$Res>
+    extends _$PrintStationResultCopyWithImpl<$Res, _$PrintStationResultImpl>
+    implements _$$PrintStationResultImplCopyWith<$Res> {
+  __$$PrintStationResultImplCopyWithImpl(
+    _$PrintStationResultImpl _value,
+    $Res Function(_$PrintStationResultImpl) _then,
+  ) : super(_value, _then);
+
+  /// Create a copy of PrintStationResult
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? station = null,
+    Object? status = null,
+    Object? message = freezed,
+    Object? elapsed = null,
+  }) {
+    return _then(
+      _$PrintStationResultImpl(
+        station: null == station
+            ? _value.station
+            : station // ignore: cast_nullable_to_non_nullable
+                  as PrintStation,
+        status: null == status
+            ? _value.status
+            : status // ignore: cast_nullable_to_non_nullable
+                  as PrintStationStatus,
+        message: freezed == message
+            ? _value.message
+            : message // ignore: cast_nullable_to_non_nullable
+                  as String?,
+        elapsed: null == elapsed
+            ? _value.elapsed
+            : elapsed // ignore: cast_nullable_to_non_nullable
+                  as Duration,
+      ),
+    );
+  }
+}
+
+/// @nodoc
+
+class _$PrintStationResultImpl extends _PrintStationResult {
+  const _$PrintStationResultImpl({
+    required this.station,
+    required this.status,
+    this.message,
+    this.elapsed = Duration.zero,
+  }) : super._();
+
+  @override
+  final PrintStation station;
+  @override
+  final PrintStationStatus status;
+  @override
+  final String? message;
+  @override
+  @JsonKey()
+  final Duration elapsed;
+
+  @override
+  String toString() {
+    return 'PrintStationResult(station: $station, status: $status, message: $message, elapsed: $elapsed)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$PrintStationResultImpl &&
+            (identical(other.station, station) || other.station == station) &&
+            (identical(other.status, status) || other.status == status) &&
+            (identical(other.message, message) || other.message == message) &&
+            (identical(other.elapsed, elapsed) || other.elapsed == elapsed));
+  }
+
+  @override
+  int get hashCode =>
+      Object.hash(runtimeType, station, status, message, elapsed);
+
+  /// Create a copy of PrintStationResult
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$PrintStationResultImplCopyWith<_$PrintStationResultImpl> get copyWith =>
+      __$$PrintStationResultImplCopyWithImpl<_$PrintStationResultImpl>(
+        this,
+        _$identity,
+      );
+}
+
+abstract class _PrintStationResult extends PrintStationResult {
+  const factory _PrintStationResult({
+    required final PrintStation station,
+    required final PrintStationStatus status,
+    final String? message,
+    final Duration elapsed,
+  }) = _$PrintStationResultImpl;
+  const _PrintStationResult._() : super._();
+
+  @override
+  PrintStation get station;
+  @override
+  PrintStationStatus get status;
+  @override
+  String? get message;
+  @override
+  Duration get elapsed;
+
+  /// Create a copy of PrintStationResult
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$PrintStationResultImplCopyWith<_$PrintStationResultImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
 /// @nodoc
 mixin _$PrinterFailure {
   @optionalTypeArgs

lib/domain/printer/repositories/i_printer_repository.dart

@@ -15,8 +15,17 @@ abstract class IPrinterRepository {
     List<int> printValue,
   );
 
-  Future<Either<PrinterFailure, Unit>> printStruckOrder({required Order order});
-  Future<Either<PrinterFailure, Unit>> printStruckSaveOrder({
+  /// Mencetak [stations] untuk [order], melaporkan status tiap station.
+  ///
+  /// Setiap emit berisi daftar lengkap semua station, jadi UI cukup
+  /// menggambar ulang apa adanya.
+  ///
+  /// Satu station yang gagal **tidak** membatalkan station lainnya — semuanya
+  /// tetap dicoba. Station Bluetooth dijalankan berurutan karena radionya
+  /// hanya satu, station Network dijalankan paralel karena tidak berebut
+  /// sumber daya dengan Bluetooth.
+  Stream<List<PrintStationResult>> printStations({
     required Order order,
+    required List<PrintStation> stations,
   });
 }

lib/domain/product/entities/product_entity.dart

@@ -21,6 +21,8 @@ class ListProduct with _$ListProduct {
 
 @freezed
 class Product with _$Product {
+  const Product._();
+
   const factory Product({
     required String id,
     required String organizationId,
@@ -33,11 +35,17 @@ class Product with _$Product {
     required String businessType,
     required String imageUrl,
     required String printerType,
+    required bool printToChecker,
     required Map<String, dynamic> metadata,
     required bool isActive,
     required String createdAt,
     required String updatedAt,
     required List<ProductVariant> variants,
+    /// `unit` (default) atau `weight`. Lihat [SellBy].
+    @Default(SellBy.unit) String sellBy,
+    @Default('') String unitId,
+    @Default('') String unitName,
+    @Default('') String unitAbbreviation,
   }) = _Product;
 
   factory Product.empty() => const Product(
@@ -52,12 +60,25 @@ class Product with _$Product {
     businessType: '',
     imageUrl: '',
     printerType: '',
+    printToChecker: false,
     metadata: {},
     isActive: false,
     createdAt: '',
     updatedAt: '',
     variants: [],
   );
+
+  /// Produk yang dijual per timbangan: `quantity` selalu 1, `weight` wajib.
+  bool get isSoldByWeight => SellBy.isWeight(sellBy);
+
+  /// Singkatan satuan untuk ditampilkan — `ons`. Jatuh ke nama panjang bila
+  /// backend hanya mengirim itu.
+  String get unitLabel =>
+      unitAbbreviation.isNotEmpty ? unitAbbreviation : unitName;
+
+  /// Label harga mengikuti satuan: "Harga per ons".
+  String get priceUnitLabel =>
+      isSoldByWeight && unitLabel.isNotEmpty ? 'per $unitLabel' : '';
 }
 
 @freezed

lib/domain/product/entities/product_quantity_entity.dart

@@ -1,14 +1,53 @@
 part of '../product.dart';
 
+/// Satu baris keranjang.
+///
+/// Untuk produk timbangan, **satu penimbangan = satu baris**: dua kali menimbang
+/// Ikan Tude menghasilkan dua baris terpisah dengan [quantity] 1 dan [weight]
+/// masing-masing. Karena itu baris dibedakan lewat [lineId], bukan lewat
+/// kombinasi produk + varian.
 @freezed
 class ProductQuantity with _$ProductQuantity {
+  const ProductQuantity._();
+
   const factory ProductQuantity({
     required Product product,
     ProductVariant? variant,
     required int quantity,
     required String notes,
+    @Default('') String lineId,
+
+    /// Angka timbangan dalam satuan produk. `null` untuk produk cacah.
+    double? weight,
   }) = _ProductQuantity;
 
   factory ProductQuantity.empty() =>
       ProductQuantity(product: Product.empty(), quantity: 0, notes: '');
+
+  bool get isWeighted => weight != null;
+
+  double get unitPrice => product.price + (variant?.priceModifier ?? 0);
+
+  /// Harga baris: `weight × unit_price` untuk timbangan, `quantity × unit_price`
+  /// untuk produk cacah.
+  double get lineTotal =>
+      isWeighted ? unitPrice * weight! : unitPrice * quantity;
+
+  /// `4,2 ons` atau `2` — dipakai di kolom Qty keranjang.
+  String get quantityLabel {
+    if (!isWeighted) return quantity.toString();
+    final label = product.unitLabel;
+    final value = weight!.weightFormat;
+    return label.isEmpty ? value : '$value $label';
+  }
+}
+
+extension ProductQuantityListExt on List<ProductQuantity> {
+  /// Total keranjang: baris berbobot pakai `weight × harga`, baris cacah pakai
+  /// `quantity × harga`.
+  double get cartTotal => fold<double>(0, (sum, item) => sum + item.lineTotal);
+
+  /// Baris berbobot dihitung satu — satu penimbangan, satu barang.
+  int get cartItemCount =>
+      fold<int>(0, (sum, item) => sum + (item.isWeighted ? 1 : item.quantity));
 }

lib/domain/product/product.dart

@@ -3,6 +3,8 @@ import 'package:flutter/foundation.dart';
 import 'package:freezed_annotation/freezed_annotation.dart';
 
 import '../../common/api/api_failure.dart';
+import '../../common/extension/extension.dart';
+import '../../common/types/sell_by.dart';
 
 part 'product.freezed.dart';
 

lib/domain/product/product.freezed.dart

@@ -279,12 +279,19 @@ mixin _$Product {
   String get businessType => throw _privateConstructorUsedError;
   String get imageUrl => throw _privateConstructorUsedError;
   String get printerType => throw _privateConstructorUsedError;
+  bool get printToChecker => throw _privateConstructorUsedError;
   Map<String, dynamic> get metadata => throw _privateConstructorUsedError;
   bool get isActive => throw _privateConstructorUsedError;
   String get createdAt => throw _privateConstructorUsedError;
   String get updatedAt => throw _privateConstructorUsedError;
   List<ProductVariant> get variants => throw _privateConstructorUsedError;
 
+  /// `unit` (default) atau `weight`. Lihat [SellBy].
+  String get sellBy => throw _privateConstructorUsedError;
+  String get unitId => throw _privateConstructorUsedError;
+  String get unitName => throw _privateConstructorUsedError;
+  String get unitAbbreviation => throw _privateConstructorUsedError;
+
   /// Create a copy of Product
   /// with the given fields replaced by the non-null parameter values.
   @JsonKey(includeFromJson: false, includeToJson: false)
@@ -308,11 +315,16 @@ abstract class $ProductCopyWith<$Res> {
     String businessType,
     String imageUrl,
     String printerType,
+    bool printToChecker,
     Map<String, dynamic> metadata,
     bool isActive,
     String createdAt,
     String updatedAt,
     List<ProductVariant> variants,
+    String sellBy,
+    String unitId,
+    String unitName,
+    String unitAbbreviation,
   });
 }
 
@@ -342,11 +354,16 @@ class _$ProductCopyWithImpl<$Res, $Val extends Product>
     Object? businessType = null,
     Object? imageUrl = null,
     Object? printerType = null,
+    Object? printToChecker = null,
     Object? metadata = null,
     Object? isActive = null,
     Object? createdAt = null,
     Object? updatedAt = null,
     Object? variants = null,
+    Object? sellBy = null,
+    Object? unitId = null,
+    Object? unitName = null,
+    Object? unitAbbreviation = null,
   }) {
     return _then(
       _value.copyWith(
@@ -394,6 +411,10 @@ class _$ProductCopyWithImpl<$Res, $Val extends Product>
                 ? _value.printerType
                 : printerType // ignore: cast_nullable_to_non_nullable
                       as String,
+            printToChecker: null == printToChecker
+                ? _value.printToChecker
+                : printToChecker // ignore: cast_nullable_to_non_nullable
+                      as bool,
             metadata: null == metadata
                 ? _value.metadata
                 : metadata // ignore: cast_nullable_to_non_nullable
@@ -414,6 +435,22 @@ class _$ProductCopyWithImpl<$Res, $Val extends Product>
                 ? _value.variants
                 : variants // ignore: cast_nullable_to_non_nullable
                       as List<ProductVariant>,
+            sellBy: null == sellBy
+                ? _value.sellBy
+                : sellBy // ignore: cast_nullable_to_non_nullable
+                      as String,
+            unitId: null == unitId
+                ? _value.unitId
+                : unitId // ignore: cast_nullable_to_non_nullable
+                      as String,
+            unitName: null == unitName
+                ? _value.unitName
+                : unitName // ignore: cast_nullable_to_non_nullable
+                      as String,
+            unitAbbreviation: null == unitAbbreviation
+                ? _value.unitAbbreviation
+                : unitAbbreviation // ignore: cast_nullable_to_non_nullable
+                      as String,
           )
           as $Val,
     );
@@ -440,11 +477,16 @@ abstract class _$$ProductImplCopyWith<$Res> implements $ProductCopyWith<$Res> {
     String businessType,
     String imageUrl,
     String printerType,
+    bool printToChecker,
     Map<String, dynamic> metadata,
     bool isActive,
     String createdAt,
     String updatedAt,
     List<ProductVariant> variants,
+    String sellBy,
+    String unitId,
+    String unitName,
+    String unitAbbreviation,
   });
 }
 
@@ -473,11 +515,16 @@ class __$$ProductImplCopyWithImpl<$Res>
     Object? businessType = null,
     Object? imageUrl = null,
     Object? printerType = null,
+    Object? printToChecker = null,
     Object? metadata = null,
     Object? isActive = null,
     Object? createdAt = null,
     Object? updatedAt = null,
     Object? variants = null,
+    Object? sellBy = null,
+    Object? unitId = null,
+    Object? unitName = null,
+    Object? unitAbbreviation = null,
   }) {
     return _then(
       _$ProductImpl(
@@ -525,6 +572,10 @@ class __$$ProductImplCopyWithImpl<$Res>
             ? _value.printerType
             : printerType // ignore: cast_nullable_to_non_nullable
                   as String,
+        printToChecker: null == printToChecker
+            ? _value.printToChecker
+            : printToChecker // ignore: cast_nullable_to_non_nullable
+                  as bool,
         metadata: null == metadata
             ? _value._metadata
             : metadata // ignore: cast_nullable_to_non_nullable
@@ -545,6 +596,22 @@ class __$$ProductImplCopyWithImpl<$Res>
             ? _value._variants
             : variants // ignore: cast_nullable_to_non_nullable
                   as List<ProductVariant>,
+        sellBy: null == sellBy
+            ? _value.sellBy
+            : sellBy // ignore: cast_nullable_to_non_nullable
+                  as String,
+        unitId: null == unitId
+            ? _value.unitId
+            : unitId // ignore: cast_nullable_to_non_nullable
+                  as String,
+        unitName: null == unitName
+            ? _value.unitName
+            : unitName // ignore: cast_nullable_to_non_nullable
+                  as String,
+        unitAbbreviation: null == unitAbbreviation
+            ? _value.unitAbbreviation
+            : unitAbbreviation // ignore: cast_nullable_to_non_nullable
+                  as String,
       ),
     );
   }
@@ -552,7 +619,7 @@ class __$$ProductImplCopyWithImpl<$Res>
 
 /// @nodoc
 
-class _$ProductImpl with DiagnosticableTreeMixin implements _Product {
+class _$ProductImpl extends _Product with DiagnosticableTreeMixin {
   const _$ProductImpl({
     required this.id,
     required this.organizationId,
@@ -565,13 +632,19 @@ class _$ProductImpl with DiagnosticableTreeMixin implements _Product {
     required this.businessType,
     required this.imageUrl,
     required this.printerType,
+    required this.printToChecker,
     required final Map<String, dynamic> metadata,
     required this.isActive,
     required this.createdAt,
     required this.updatedAt,
     required final List<ProductVariant> variants,
+    this.sellBy = SellBy.unit,
+    this.unitId = '',
+    this.unitName = '',
+    this.unitAbbreviation = '',
   }) : _metadata = metadata,
-       _variants = variants;
+       _variants = variants,
+       super._();
 
   @override
   final String id;
@@ -595,6 +668,8 @@ class _$ProductImpl with DiagnosticableTreeMixin implements _Product {
   final String imageUrl;
   @override
   final String printerType;
+  @override
+  final bool printToChecker;
   final Map<String, dynamic> _metadata;
   @override
   Map<String, dynamic> get metadata {
@@ -617,9 +692,23 @@ class _$ProductImpl with DiagnosticableTreeMixin implements _Product {
     return EqualUnmodifiableListView(_variants);
   }
 
+  /// `unit` (default) atau `weight`. Lihat [SellBy].
+  @override
+  @JsonKey()
+  final String sellBy;
+  @override
+  @JsonKey()
+  final String unitId;
+  @override
+  @JsonKey()
+  final String unitName;
+  @override
+  @JsonKey()
+  final String unitAbbreviation;
+
   @override
   String toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) {
-    return 'Product(id: $id, organizationId: $organizationId, categoryId: $categoryId, sku: $sku, name: $name, description: $description, price: $price, cost: $cost, businessType: $businessType, imageUrl: $imageUrl, printerType: $printerType, metadata: $metadata, isActive: $isActive, createdAt: $createdAt, updatedAt: $updatedAt, variants: $variants)';
+    return 'Product(id: $id, organizationId: $organizationId, categoryId: $categoryId, sku: $sku, name: $name, description: $description, price: $price, cost: $cost, businessType: $businessType, imageUrl: $imageUrl, printerType: $printerType, printToChecker: $printToChecker, metadata: $metadata, isActive: $isActive, createdAt: $createdAt, updatedAt: $updatedAt, variants: $variants, sellBy: $sellBy, unitId: $unitId, unitName: $unitName, unitAbbreviation: $unitAbbreviation)';
   }
 
   @override
@@ -638,11 +727,16 @@ class _$ProductImpl with DiagnosticableTreeMixin implements _Product {
       ..add(DiagnosticsProperty('businessType', businessType))
       ..add(DiagnosticsProperty('imageUrl', imageUrl))
       ..add(DiagnosticsProperty('printerType', printerType))
+      ..add(DiagnosticsProperty('printToChecker', printToChecker))
       ..add(DiagnosticsProperty('metadata', metadata))
       ..add(DiagnosticsProperty('isActive', isActive))
       ..add(DiagnosticsProperty('createdAt', createdAt))
       ..add(DiagnosticsProperty('updatedAt', updatedAt))
-      ..add(DiagnosticsProperty('variants', variants));
+      ..add(DiagnosticsProperty('variants', variants))
+      ..add(DiagnosticsProperty('sellBy', sellBy))
+      ..add(DiagnosticsProperty('unitId', unitId))
+      ..add(DiagnosticsProperty('unitName', unitName))
+      ..add(DiagnosticsProperty('unitAbbreviation', unitAbbreviation));
   }
 
   @override
@@ -667,6 +761,8 @@ class _$ProductImpl with DiagnosticableTreeMixin implements _Product {
                 other.imageUrl == imageUrl) &&
             (identical(other.printerType, printerType) ||
                 other.printerType == printerType) &&
+            (identical(other.printToChecker, printToChecker) ||
+                other.printToChecker == printToChecker) &&
             const DeepCollectionEquality().equals(other._metadata, _metadata) &&
             (identical(other.isActive, isActive) ||
                 other.isActive == isActive) &&
@@ -674,11 +770,17 @@ class _$ProductImpl with DiagnosticableTreeMixin implements _Product {
                 other.createdAt == createdAt) &&
             (identical(other.updatedAt, updatedAt) ||
                 other.updatedAt == updatedAt) &&
-            const DeepCollectionEquality().equals(other._variants, _variants));
+            const DeepCollectionEquality().equals(other._variants, _variants) &&
+            (identical(other.sellBy, sellBy) || other.sellBy == sellBy) &&
+            (identical(other.unitId, unitId) || other.unitId == unitId) &&
+            (identical(other.unitName, unitName) ||
+                other.unitName == unitName) &&
+            (identical(other.unitAbbreviation, unitAbbreviation) ||
+                other.unitAbbreviation == unitAbbreviation));
   }
 
   @override
-  int get hashCode => Object.hash(
+  int get hashCode => Object.hashAll([
     runtimeType,
     id,
     organizationId,
@@ -691,12 +793,17 @@ class _$ProductImpl with DiagnosticableTreeMixin implements _Product {
     businessType,
     imageUrl,
     printerType,
+    printToChecker,
     const DeepCollectionEquality().hash(_metadata),
     isActive,
     createdAt,
     updatedAt,
     const DeepCollectionEquality().hash(_variants),
-  );
+    sellBy,
+    unitId,
+    unitName,
+    unitAbbreviation,
+  ]);
 
   /// Create a copy of Product
   /// with the given fields replaced by the non-null parameter values.
@@ -707,7 +814,7 @@ class _$ProductImpl with DiagnosticableTreeMixin implements _Product {
       __$$ProductImplCopyWithImpl<_$ProductImpl>(this, _$identity);
 }
 
-abstract class _Product implements Product {
+abstract class _Product extends Product {
   const factory _Product({
     required final String id,
     required final String organizationId,
@@ -720,12 +827,18 @@ abstract class _Product implements Product {
     required final String businessType,
     required final String imageUrl,
     required final String printerType,
+    required final bool printToChecker,
     required final Map<String, dynamic> metadata,
     required final bool isActive,
     required final String createdAt,
     required final String updatedAt,
     required final List<ProductVariant> variants,
+    final String sellBy,
+    final String unitId,
+    final String unitName,
+    final String unitAbbreviation,
   }) = _$ProductImpl;
+  const _Product._() : super._();
 
   @override
   String get id;
@@ -750,6 +863,8 @@ abstract class _Product implements Product {
   @override
   String get printerType;
   @override
+  bool get printToChecker;
+  @override
   Map<String, dynamic> get metadata;
   @override
   bool get isActive;
@@ -760,6 +875,16 @@ abstract class _Product implements Product {
   @override
   List<ProductVariant> get variants;
 
+  /// `unit` (default) atau `weight`. Lihat [SellBy].
+  @override
+  String get sellBy;
+  @override
+  String get unitId;
+  @override
+  String get unitName;
+  @override
+  String get unitAbbreviation;
+
   /// Create a copy of Product
   /// with the given fields replaced by the non-null parameter values.
   @override
@@ -1098,6 +1223,10 @@ mixin _$ProductQuantity {
   ProductVariant? get variant => throw _privateConstructorUsedError;
   int get quantity => throw _privateConstructorUsedError;
   String get notes => throw _privateConstructorUsedError;
+  String get lineId => throw _privateConstructorUsedError;
+
+  /// Angka timbangan dalam satuan produk. `null` untuk produk cacah.
+  double? get weight => throw _privateConstructorUsedError;
 
   /// Create a copy of ProductQuantity
   /// with the given fields replaced by the non-null parameter values.
@@ -1118,6 +1247,8 @@ abstract class $ProductQuantityCopyWith<$Res> {
     ProductVariant? variant,
     int quantity,
     String notes,
+    String lineId,
+    double? weight,
   });
 
   $ProductCopyWith<$Res> get product;
@@ -1143,6 +1274,8 @@ class _$ProductQuantityCopyWithImpl<$Res, $Val extends ProductQuantity>
     Object? variant = freezed,
     Object? quantity = null,
     Object? notes = null,
+    Object? lineId = null,
+    Object? weight = freezed,
   }) {
     return _then(
       _value.copyWith(
@@ -1162,6 +1295,14 @@ class _$ProductQuantityCopyWithImpl<$Res, $Val extends ProductQuantity>
                 ? _value.notes
                 : notes // ignore: cast_nullable_to_non_nullable
                       as String,
+            lineId: null == lineId
+                ? _value.lineId
+                : lineId // ignore: cast_nullable_to_non_nullable
+                      as String,
+            weight: freezed == weight
+                ? _value.weight
+                : weight // ignore: cast_nullable_to_non_nullable
+                      as double?,
           )
           as $Val,
     );
@@ -1206,6 +1347,8 @@ abstract class _$$ProductQuantityImplCopyWith<$Res>
     ProductVariant? variant,
     int quantity,
     String notes,
+    String lineId,
+    double? weight,
   });
 
   @override
@@ -1232,6 +1375,8 @@ class __$$ProductQuantityImplCopyWithImpl<$Res>
     Object? variant = freezed,
     Object? quantity = null,
     Object? notes = null,
+    Object? lineId = null,
+    Object? weight = freezed,
   }) {
     return _then(
       _$ProductQuantityImpl(
@@ -1251,6 +1396,14 @@ class __$$ProductQuantityImplCopyWithImpl<$Res>
             ? _value.notes
             : notes // ignore: cast_nullable_to_non_nullable
                   as String,
+        lineId: null == lineId
+            ? _value.lineId
+            : lineId // ignore: cast_nullable_to_non_nullable
+                  as String,
+        weight: freezed == weight
+            ? _value.weight
+            : weight // ignore: cast_nullable_to_non_nullable
+                  as double?,
       ),
     );
   }
@@ -1258,15 +1411,16 @@ class __$$ProductQuantityImplCopyWithImpl<$Res>
 
 /// @nodoc
 
-class _$ProductQuantityImpl
-    with DiagnosticableTreeMixin
-    implements _ProductQuantity {
+class _$ProductQuantityImpl extends _ProductQuantity
+    with DiagnosticableTreeMixin {
   const _$ProductQuantityImpl({
     required this.product,
     this.variant,
     required this.quantity,
     required this.notes,
-  });
+    this.lineId = '',
+    this.weight,
+  }) : super._();
 
   @override
   final Product product;
@@ -1276,10 +1430,17 @@ class _$ProductQuantityImpl
   final int quantity;
   @override
   final String notes;
+  @override
+  @JsonKey()
+  final String lineId;
+
+  /// Angka timbangan dalam satuan produk. `null` untuk produk cacah.
+  @override
+  final double? weight;
 
   @override
   String toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) {
-    return 'ProductQuantity(product: $product, variant: $variant, quantity: $quantity, notes: $notes)';
+    return 'ProductQuantity(product: $product, variant: $variant, quantity: $quantity, notes: $notes, lineId: $lineId, weight: $weight)';
   }
 
   @override
@@ -1290,7 +1451,9 @@ class _$ProductQuantityImpl
       ..add(DiagnosticsProperty('product', product))
       ..add(DiagnosticsProperty('variant', variant))
       ..add(DiagnosticsProperty('quantity', quantity))
-      ..add(DiagnosticsProperty('notes', notes));
+      ..add(DiagnosticsProperty('notes', notes))
+      ..add(DiagnosticsProperty('lineId', lineId))
+      ..add(DiagnosticsProperty('weight', weight));
   }
 
   @override
@@ -1302,12 +1465,21 @@ class _$ProductQuantityImpl
             (identical(other.variant, variant) || other.variant == variant) &&
             (identical(other.quantity, quantity) ||
                 other.quantity == quantity) &&
-            (identical(other.notes, notes) || other.notes == notes));
+            (identical(other.notes, notes) || other.notes == notes) &&
+            (identical(other.lineId, lineId) || other.lineId == lineId) &&
+            (identical(other.weight, weight) || other.weight == weight));
   }
 
   @override
-  int get hashCode =>
-      Object.hash(runtimeType, product, variant, quantity, notes);
+  int get hashCode => Object.hash(
+    runtimeType,
+    product,
+    variant,
+    quantity,
+    notes,
+    lineId,
+    weight,
+  );
 
   /// Create a copy of ProductQuantity
   /// with the given fields replaced by the non-null parameter values.
@@ -1321,13 +1493,16 @@ class _$ProductQuantityImpl
       );
 }
 
-abstract class _ProductQuantity implements ProductQuantity {
+abstract class _ProductQuantity extends ProductQuantity {
   const factory _ProductQuantity({
     required final Product product,
     final ProductVariant? variant,
     required final int quantity,
     required final String notes,
+    final String lineId,
+    final double? weight,
   }) = _$ProductQuantityImpl;
+  const _ProductQuantity._() : super._();
 
   @override
   Product get product;
@@ -1337,6 +1512,12 @@ abstract class _ProductQuantity implements ProductQuantity {
   int get quantity;
   @override
   String get notes;
+  @override
+  String get lineId;
+
+  /// Angka timbangan dalam satuan produk. `null` untuk produk cacah.
+  @override
+  double? get weight;
 
   /// Create a copy of ProductQuantity
   /// with the given fields replaced by the non-null parameter values.

lib/domain/table/entities/table_entity.dart

@@ -10,8 +10,13 @@ class ListTable with _$ListTable {
     required int totalPages,
   }) = _ListTable;
 
-  factory ListTable.empty() =>
-      ListTable(tables: [], totalCount: 0, page: 0, limit: 0, totalPages: 0);
+  factory ListTable.empty() => const ListTable(
+    tables: [],
+    totalCount: 0,
+    page: 0,
+    limit: 0,
+    totalPages: 0,
+  );
 }
 
 @freezed

lib/domain/unit/entities/unit_entity.dart

@@ -0,0 +1,23 @@
+part of '../unit.dart';
+
+/// Satuan timbangan milik organisasi — ons, kg, gram.
+///
+/// [abbreviation] yang dipakai POS untuk mencetak `4,2 ons` di struk.
+@freezed
+class ProductUnit with _$ProductUnit {
+  const factory ProductUnit({
+    required String id,
+    required String organizationId,
+    required String name,
+    required String abbreviation,
+    required bool isActive,
+  }) = _ProductUnit;
+
+  factory ProductUnit.empty() => const ProductUnit(
+    id: '',
+    organizationId: '',
+    name: '',
+    abbreviation: '',
+    isActive: false,
+  );
+}

lib/domain/unit/failures/unit_failure.dart

@@ -0,0 +1,12 @@
+part of '../unit.dart';
+
+@freezed
+sealed class UnitFailure with _$UnitFailure {
+  const factory UnitFailure.serverError(ApiFailure failure) = _ServerError;
+  const factory UnitFailure.unexpectedError() = _UnexpectedError;
+  const factory UnitFailure.empty() = _Empty;
+  const factory UnitFailure.localStorageError(String erroMessage) =
+      _LocalStorageError;
+  const factory UnitFailure.dynamicErrorMessage(String erroMessage) =
+      _DynamicErrorMessage;
+}

lib/domain/unit/repositories/i_unit_repository.dart

@@ -0,0 +1,12 @@
+part of '../unit.dart';
+
+abstract class IUnitRepository {
+  /// Ambil satuan dari server lalu simpan ke cache lokal.
+  /// Bila server tidak terjangkau, kembalikan isi cache supaya POS tetap bisa
+  /// mencetak `4,2 ons` saat offline.
+  Future<Either<UnitFailure, List<ProductUnit>>> getUnits({
+    bool forceRefresh = false,
+  });
+
+  Future<List<ProductUnit>> cachedUnits();
+}

lib/domain/unit/unit.dart

@@ -0,0 +1,10 @@
+import 'package:dartz/dartz.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+import '../../common/api/api_failure.dart';
+
+part 'unit.freezed.dart';
+
+part 'entities/unit_entity.dart';
+part 'failures/unit_failure.dart';
+part 'repositories/i_unit_repository.dart';

lib/env.dart

@@ -2,6 +2,7 @@ import 'package:injectable/injectable.dart';
 
 abstract class Env {
   String get baseUrl;
+  String get dbName;
   // add getter here...
 }
 
@@ -9,12 +10,18 @@ abstract class Env {
 @dev
 class DevEnv implements Env {
   @override
-  String get baseUrl => 'https://api-pos.apskel.id'; // example value
+  String get baseUrl => 'https://enaklo-pos-api.altru.id';
+
+  @override
+  String get dbName => "apskel_pos_staging.db";
 }
 
 @Injectable(as: Env)
 @prod
 class ProdEnv implements Env {
   @override
-  String get baseUrl => 'https://api-pos.apskel.id';
+  String get baseUrl => 'https://enaklo-pos-api.altru.id';
+
+  @override
+  String get dbName => "apskel_pos_prod.db";
 }

lib/infrastructure/analytic/datasources/remote_data_provider.dart

@@ -36,7 +36,7 @@ class AnalyticRemoteDataProvider {
       );
 
       if (response.data['success'] == false) {
-        return DC.error(AnalyticFailure.unexpectedError());
+        return DC.error(const AnalyticFailure.unexpectedError());
       }
 
       final dashboard = DashboardAnalyticDto.fromJson(
@@ -65,7 +65,7 @@ class AnalyticRemoteDataProvider {
       );
 
       if (response.data['success'] == false) {
-        return DC.error(AnalyticFailure.unexpectedError());
+        return DC.error(const AnalyticFailure.unexpectedError());
       }
 
       final sales = SalesAnalyticDto.fromJson(
@@ -94,7 +94,7 @@ class AnalyticRemoteDataProvider {
       );
 
       if (response.data['success'] == false) {
-        return DC.error(AnalyticFailure.unexpectedError());
+        return DC.error(const AnalyticFailure.unexpectedError());
       }
 
       final products = ProductAnalyticDto.fromJson(
@@ -123,7 +123,7 @@ class AnalyticRemoteDataProvider {
       );
 
       if (response.data['success'] == false) {
-        return DC.error(AnalyticFailure.unexpectedError());
+        return DC.error(const AnalyticFailure.unexpectedError());
       }
 
       final paymentMethods = PaymentMethodAnalyticDto.fromJson(
@@ -152,7 +152,7 @@ class AnalyticRemoteDataProvider {
       );
 
       if (response.data['success'] == false) {
-        return DC.error(AnalyticFailure.unexpectedError());
+        return DC.error(const AnalyticFailure.unexpectedError());
       }
 
       final profitLoss = ProfitLossAnalyticDto.fromJson(
@@ -181,7 +181,7 @@ class AnalyticRemoteDataProvider {
       );
 
       if (response.data['success'] == false) {
-        return DC.error(AnalyticFailure.unexpectedError());
+        return DC.error(const AnalyticFailure.unexpectedError());
       }
 
       final categories = CategoryAnalyticDto.fromJson(
@@ -211,7 +211,7 @@ class AnalyticRemoteDataProvider {
       );
 
       if (response.data['success'] == false) {
-        return DC.error(AnalyticFailure.unexpectedError());
+        return DC.error(const AnalyticFailure.unexpectedError());
       }
 
       final inventory = InventoryAnalyticDto.fromJson(

lib/infrastructure/auth/datasources/local_data_provider.dart

@@ -53,6 +53,7 @@ class AuthLocalDataProvider {
     try {
       await _sharedPreferences.remove(LocalStorageKey.token);
       await _sharedPreferences.remove(LocalStorageKey.user);
+      await _sharedPreferences.remove(LocalStorageKey.outlet);
     } catch (e) {
       log('deleteAllAuthError', name: _logName, error: e);
     }

lib/infrastructure/auth/datasources/remote_data_provider.dart

@@ -1,10 +1,12 @@
 import 'dart:developer';
 
+import 'package:dartz/dartz.dart';
 import 'package:data_channel/data_channel.dart';
 import 'package:injectable/injectable.dart';
 
 import '../../../common/api/api_client.dart';
 import '../../../common/api/api_failure.dart';
+import '../../../common/function/app_function.dart';
 import '../../../common/url/api_path.dart';
 import '../../../domain/auth/auth.dart';
 import '../auth_dtos.dart';
@@ -19,16 +21,23 @@ class AuthRemoteDataProvider {
   Future<DC<AuthFailure, LoginDto>> login({
     required String email,
     required String password,
+    required Map<String, String> devicePayload,
+    required String fcmToken,
   }) async {
     try {
       final response = await _apiClient.post(
         ApiPath.login,
-        data: {'email': email, 'password': password},
+        data: {
+          'email': email,
+          'password': password,
+          'fcm_token': fcmToken,
+          ...devicePayload,
+        },
       );
 
       if (response.data['code'] == 401) {
         return DC.error(
-          AuthFailure.serverError(
+          const AuthFailure.serverError(
             ApiFailure.unauthorized('Incorrect email or password'),
           ),
         );
@@ -41,4 +50,22 @@ class AuthRemoteDataProvider {
       return DC.error(AuthFailure.serverError(e));
     }
   }
+
+  Future<DC<AuthFailure, Unit>> logout() async {
+    try {
+      final response = await _apiClient.post(
+        ApiPath.logout,
+        headers: getAuthorizationHeader(),
+      );
+
+      if (response.data['success'] == false) {
+        return DC.error(const AuthFailure.unexpectedError());
+      }
+
+      return DC.data(unit);
+    } on ApiFailure catch (e, s) {
+      log('logout', name: _logName, error: e, stackTrace: s);
+      return DC.error(AuthFailure.serverError(e));
+    }
+  }
 }

lib/infrastructure/auth/dto/login_dto.dart

@@ -1,3 +1,5 @@
+// ignore_for_file: prefer_const_constructors
+
 part of '../auth_dtos.dart';
 
 @freezed

lib/infrastructure/auth/repositories/auth_repository.dart

@@ -19,11 +19,15 @@ class AuthRepository implements IAuthRepository {
   Future<Either<AuthFailure, Login>> login({
     required String email,
     required String password,
+    required Map<String, String> devicePayload,
+    required String fcmToken,
   }) async {
     try {
       final result = await _dataProvider.login(
         email: email,
         password: password,
+        devicePayload: devicePayload,
+        fcmToken: fcmToken,
       );
 
       if (result.hasError) {
@@ -57,4 +61,21 @@ class AuthRepository implements IAuthRepository {
   Future<bool> hasToken() async {
     return await _localDataProvider.hasToken();
   }
+
+  @override
+  Future<Either<AuthFailure, Unit>> logout() async {
+    try {
+      final result = await _dataProvider.logout();
+
+      if (result.hasError) {
+        return left(result.error!);
+      }
+
+      await _localDataProvider.deleteAllAuth();
+      return right(unit);
+    } catch (e, s) {
+      log('logoutError', name: _logName, error: e, stackTrace: s);
+      return left(const AuthFailure.unexpectedError());
+    }
+  }
 }