import 'dart:io';
import 'package:flutter/services.dart';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;

import '../../../common/utils/pdf_service.dart';
import '../../../domain/analytic/analytic.dart';
import '../../../domain/outlet/outlet.dart';

class InventoryReport {
  static final primaryColor = PdfColor.fromHex("36175e");

  static Future<File> previewPdf({
    required String searchDateFormatted,
    required InventoryAnalytic inventory,
    required Outlet outlet,
  }) async {
    final pdf = pw.Document();
    final ByteData dataImage = await rootBundle.load('assets/images/logo.png');
    final Uint8List bytes = dataImage.buffer.asUint8List();

    final image = pw.MemoryImage(bytes);
    pdf.addPage(
      pw.MultiPage(
        pageFormat: PdfPageFormat.a4,
        margin: pw.EdgeInsets.zero,
        build: (pw.Context context) {
          return [
            pw.Container(
              padding: pw.EdgeInsets.all(20),
              child: pw.Row(
                mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
                crossAxisAlignment: pw.CrossAxisAlignment.start,
                children: [
                  // Bagian kiri - Logo dan Info Perusahaan
                  pw.Row(
                    crossAxisAlignment: pw.CrossAxisAlignment.center,
                    children: [
                      // Icon/Logo placeholder (bisa diganti dengan gambar logo)
                      pw.Container(
                        width: 40,
                        height: 40,
                        child: pw.Image(image),
                      ),
                      pw.SizedBox(width: 15),
                      pw.Column(
                        crossAxisAlignment: pw.CrossAxisAlignment.start,
                        children: [
                          pw.Text(
                            'Apskel',
                            style: pw.TextStyle(
                              fontSize: 28,
                              fontWeight: pw.FontWeight.bold,
                              color: primaryColor,
                            ),
                          ),
                          pw.SizedBox(height: 4),
                          pw.Text(
                            outlet.name,
                            style: pw.TextStyle(
                              fontSize: 16,
                              color: PdfColors.grey700,
                            ),
                          ),
                          pw.SizedBox(height: 2),
                          pw.Text(
                            outlet.address,
                            style: pw.TextStyle(
                              fontSize: 12,
                              color: PdfColors.grey600,
                            ),
                          ),
                        ],
                      ),
                    ],
                  ),
                  // Bagian kanan - Info Laporan
                  pw.Column(
                    crossAxisAlignment: pw.CrossAxisAlignment.end,
                    children: [
                      pw.Text(
                        'Laporan Transaksi',
                        style: pw.TextStyle(
                          fontSize: 24,
                          fontWeight: pw.FontWeight.bold,
                          color: PdfColors.grey800,
                        ),
                      ),
                      pw.SizedBox(height: 8),
                      pw.Text(
                        searchDateFormatted,
                        style: pw.TextStyle(
                          fontSize: 14,
                          color: PdfColors.grey600,
                        ),
                      ),
                      pw.SizedBox(height: 4),
                      pw.Text(
                        'Laporan',
                        style: pw.TextStyle(
                          fontSize: 12,
                          color: PdfColors.grey500,
                        ),
                      ),
                    ],
                  ),
                ],
              ),
            ),
            pw.Container(
              width: double.infinity,
              height: 3,
              color: primaryColor,
            ),

            // Summary
            pw.Container(
              padding: pw.EdgeInsets.all(20),
              child: pw.Column(
                crossAxisAlignment: pw.CrossAxisAlignment.start,
                children: [
                  _buildSectionWidget('1. Ringkasan'),
                  pw.SizedBox(height: 30),
                  pw.Row(
                    crossAxisAlignment: pw.CrossAxisAlignment.start,
                    children: [
                      pw.Expanded(
                        flex: 1,
                        child: pw.Column(
                          crossAxisAlignment: pw.CrossAxisAlignment.start,
                          children: [
                            _buildSummaryItem(
                              'Total Item',
                              (inventory.summary.totalProducts).toString(),
                            ),
                            _buildSummaryItem(
                              'Total Item Masuk',
                              (inventory.products.fold<num>(
                                0,
                                (sum, item) => sum + (item.totalIn),
                              )).toString(),
                            ),
                            _buildSummaryItem(
                              'Total Item Keluar',
                              (inventory.products.fold<num>(
                                0,
                                (sum, item) => sum + (item.totalOut),
                              )).toString(),
                            ),
                          ],
                        ),
                      ),
                      pw.SizedBox(width: 20),
                      pw.Expanded(
                        flex: 1,
                        child: pw.Column(
                          crossAxisAlignment: pw.CrossAxisAlignment.start,
                          children: [
                            _buildSummaryItem(
                              'Total Ingredient',
                              (inventory.summary.totalIngredients).toString(),
                            ),
                            _buildSummaryItem(
                              'Total Ingredient Masuk',
                              (inventory.ingredients.fold<num>(
                                0,
                                (sum, item) => sum + (item.totalIn),
                              )).toString(),
                            ),
                            _buildSummaryItem(
                              'Total Ingredient Keluar',
                              (inventory.ingredients.fold<num>(
                                0,
                                (sum, item) => sum + (item.totalOut),
                              )).toString(),
                            ),
                          ],
                        ),
                      ),
                    ],
                  ),
                ],
              ),
            ),

            // Summary Item
            pw.Container(
              padding: pw.EdgeInsets.all(20),
              child: pw.Column(
                children: [
                  pw.Column(
                    crossAxisAlignment: pw.CrossAxisAlignment.start,
                    children: [
                      _buildSectionWidget('2. Item'),
                      pw.SizedBox(height: 30),
                      pw.Container(
                        decoration: pw.BoxDecoration(
                          color: primaryColor, // Purple color
                          borderRadius: pw.BorderRadius.only(
                            topLeft: pw.Radius.circular(8),
                            topRight: pw.Radius.circular(8),
                          ),
                        ),
                        child: pw.Table(
                          columnWidths: const {
                            0: pw.FlexColumnWidth(2.5), // Produk
                            1: pw.FlexColumnWidth(2), // Kategori
                            2: pw.FlexColumnWidth(1), // Stock
                            3: pw.FlexColumnWidth(2), // Masuk
                            4: pw.FlexColumnWidth(2), // Keluar
                          },
                          children: [
                            pw.TableRow(
                              children: [
                                _buildHeaderCell('Nama'),
                                _buildHeaderCell('Kategori'),
                                _buildHeaderCell('Stock'),
                                _buildHeaderCell('Masuk'),
                                _buildHeaderCell('Keluar'),
                              ],
                            ),
                          ],
                        ),
                      ),
                      pw.Container(
                        decoration: pw.BoxDecoration(color: PdfColors.white),
                        child: pw.Table(
                          columnWidths: {
                            0: pw.FlexColumnWidth(2.5), // Produk
                            1: pw.FlexColumnWidth(2), // Kategori
                            2: pw.FlexColumnWidth(1), // Stock
                            3: pw.FlexColumnWidth(2), // Masuk
                            4: pw.FlexColumnWidth(2), // Keluar
                          },
                          children: inventory.products
                              .map(
                                (item) => _buildProductDataRow(
                                  item,
                                  inventory.products.indexOf(item) % 2 == 0,
                                ),
                              )
                              .toList(),
                        ),
                      ),
                      pw.Container(
                        decoration: pw.BoxDecoration(
                          color: primaryColor, // Purple color
                          borderRadius: pw.BorderRadius.only(
                            bottomLeft: pw.Radius.circular(8),
                            bottomRight: pw.Radius.circular(8),
                          ),
                        ),
                        child: pw.Table(
                          columnWidths: const {
                            0: pw.FlexColumnWidth(2.5), // Produk
                            1: pw.FlexColumnWidth(2), // Kategori
                            2: pw.FlexColumnWidth(1), // Stock
                            3: pw.FlexColumnWidth(2), // Masuk
                            4: pw.FlexColumnWidth(2), // Keluar
                          },
                          children: [
                            pw.TableRow(
                              children: [
                                _buildTotalCell('TOTAL'),
                                _buildTotalCell(''),
                                _buildTotalCell(
                                  (inventory.products.fold<num>(
                                    0,
                                    (sum, item) => sum + (item.quantity),
                                  )).toString(),
                                ),
                                _buildTotalCell(
                                  (inventory.products.fold<num>(
                                    0,
                                    (sum, item) => sum + (item.totalIn),
                                  )).toString(),
                                ),
                                _buildTotalCell(
                                  (inventory.products.fold<num>(
                                    0,
                                    (sum, item) => sum + (item.totalOut),
                                  )).toString(),
                                ),
                              ],
                            ),
                          ],
                        ),
                      ),
                    ],
                  ),
                ],
              ),
            ),

            // Summary Ingredient
            pw.Container(
              padding: pw.EdgeInsets.all(20),
              child: pw.Column(
                children: [
                  pw.Column(
                    crossAxisAlignment: pw.CrossAxisAlignment.start,
                    children: [
                      _buildSectionWidget('3. Ingredient'),
                      pw.SizedBox(height: 30),
                      pw.Container(
                        decoration: pw.BoxDecoration(
                          color: primaryColor, // Purple color
                          borderRadius: pw.BorderRadius.only(
                            topLeft: pw.Radius.circular(8),
                            topRight: pw.Radius.circular(8),
                          ),
                        ),
                        child: pw.Table(
                          columnWidths: const {
                            0: pw.FlexColumnWidth(2.5), // Name
                            1: pw.FlexColumnWidth(1), // Stock
                            2: pw.FlexColumnWidth(2), // Masuk
                            3: pw.FlexColumnWidth(2), // Keluar
                          },
                          children: [
                            pw.TableRow(
                              children: [
                                _buildHeaderCell('Nama'),
                                _buildHeaderCell('Stock'),
                                _buildHeaderCell('Masuk'),
                                _buildHeaderCell('Keluar'),
                              ],
                            ),
                          ],
                        ),
                      ),
                      pw.Container(
                        decoration: pw.BoxDecoration(color: PdfColors.white),
                        child: pw.Table(
                          columnWidths: {
                            0: pw.FlexColumnWidth(2.5), // Name
                            1: pw.FlexColumnWidth(1), // Stock
                            2: pw.FlexColumnWidth(2), // Masuk
                            3: pw.FlexColumnWidth(2), // Keluar
                          },
                          children: inventory.ingredients
                              .map(
                                (item) => _buildIngredientsDataRow(
                                  item,
                                  inventory.ingredients.indexOf(item) % 2 == 0,
                                ),
                              )
                              .toList(),
                        ),
                      ),
                      pw.Container(
                        decoration: pw.BoxDecoration(
                          color: primaryColor, // Purple color
                          borderRadius: pw.BorderRadius.only(
                            bottomLeft: pw.Radius.circular(8),
                            bottomRight: pw.Radius.circular(8),
                          ),
                        ),
                        child: pw.Table(
                          columnWidths: const {
                            0: pw.FlexColumnWidth(2.5), // Name
                            1: pw.FlexColumnWidth(1), // Stock
                            2: pw.FlexColumnWidth(2), // Masuk
                            3: pw.FlexColumnWidth(2), // Keluar
                          },
                          children: [
                            pw.TableRow(
                              children: [
                                _buildTotalCell('TOTAL'),
                                _buildTotalCell(
                                  (inventory.ingredients.fold<num>(
                                    0,
                                    (sum, item) => sum + (item.quantity),
                                  )).toString(),
                                ),
                                _buildTotalCell(
                                  (inventory.ingredients.fold<num>(
                                    0,
                                    (sum, item) => sum + (item.totalIn),
                                  )).toString(),
                                ),
                                _buildTotalCell(
                                  (inventory.ingredients.fold<num>(
                                    0,
                                    (sum, item) => sum + (item.totalOut),
                                  )).toString(),
                                ),
                              ],
                            ),
                          ],
                        ),
                      ),
                    ],
                  ),
                ],
              ),
            ),
          ];
        },
      ),
    );

    return HelperPdfService.saveDocument(
      name:
          'Apskel POS | Inventory Report | ${DateTime.now().millisecondsSinceEpoch}.pdf',
      pdf: pdf,
    );
  }

  static pw.Widget _buildSectionWidget(String title) {
    return pw.Text(
      title,
      style: pw.TextStyle(
        fontSize: 20,
        fontWeight: pw.FontWeight.bold,
        color: primaryColor,
      ),
    );
  }

  static pw.Widget _buildSummaryItem(
    String label,
    String value, {
    pw.TextStyle? valueStyle,
    pw.TextStyle? labelStyle,
  }) {
    return pw.Container(
      padding: pw.EdgeInsets.only(bottom: 8),
      margin: pw.EdgeInsets.only(bottom: 16),
      decoration: pw.BoxDecoration(
        border: pw.Border(bottom: pw.BorderSide(color: PdfColors.grey300)),
      ),
      child: pw.Row(
        mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
        children: [
          pw.Text(label, style: labelStyle),
          pw.Text(
            value,
            style: valueStyle ?? pw.TextStyle(fontWeight: pw.FontWeight.bold),
          ),
        ],
      ),
    );
  }

  static pw.Widget _buildHeaderCell(String text) {
    return pw.Container(
      padding: pw.EdgeInsets.symmetric(horizontal: 12, vertical: 16),
      child: pw.Text(
        text,
        style: pw.TextStyle(
          color: PdfColors.white,
          fontWeight: pw.FontWeight.bold,
          fontSize: 12,
        ),
        textAlign: pw.TextAlign.center,
      ),
    );
  }

  static pw.Widget _buildDataCell(
    String text, {
    pw.Alignment alignment = pw.Alignment.center,
    PdfColor? textColor,
  }) {
    return pw.Container(
      padding: pw.EdgeInsets.symmetric(horizontal: 12, vertical: 16),
      alignment: alignment,
      child: pw.Text(
        text,
        style: pw.TextStyle(
          fontSize: 12,
          color: textColor ?? PdfColors.black,
          fontWeight: pw.FontWeight.normal,
        ),
        textAlign: alignment == pw.Alignment.centerLeft
            ? pw.TextAlign.left
            : pw.TextAlign.center,
      ),
    );
  }

  static pw.Widget _buildTotalCell(String text) {
    return pw.Container(
      padding: pw.EdgeInsets.symmetric(horizontal: 12, vertical: 16),
      child: pw.Text(
        text,
        style: pw.TextStyle(
          color: PdfColors.white,
          fontWeight: pw.FontWeight.bold,
          fontSize: 12,
        ),
        textAlign: pw.TextAlign.center,
      ),
    );
  }

  static pw.TableRow _buildProductDataRow(
    InventoryProduct product,
    bool isEven,
  ) {
    return pw.TableRow(
      decoration: pw.BoxDecoration(
        color: product.isZeroStock
            ? PdfColors.red100
            : product.isLowStock
            ? PdfColors.yellow100
            : isEven
            ? PdfColors.grey50
            : PdfColors.white,
      ),
      children: [
        _buildDataCell(product.productName, alignment: pw.Alignment.centerLeft),
        _buildDataCell(
          product.categoryName,
          alignment: pw.Alignment.centerLeft,
        ),
        _buildDataCell(product.quantity.toString()),
        _buildDataCell(product.totalIn.toString()),
        _buildDataCell(product.totalOut.toString()),
      ],
    );
  }

  static pw.TableRow _buildIngredientsDataRow(
    InventoryIngredient item,
    bool isEven,
  ) {
    return pw.TableRow(
      decoration: pw.BoxDecoration(
        color: item.isZeroStock
            ? PdfColors.red100
            : item.isLowStock
            ? PdfColors.yellow100
            : isEven
            ? PdfColors.grey50
            : PdfColors.white,
      ),
      children: [
        _buildDataCell(item.ingredientName, alignment: pw.Alignment.centerLeft),
        _buildDataCell(item.quantity.toString()),
        _buildDataCell(item.totalIn.toString()),
        _buildDataCell(item.totalOut.toString()),
      ],
    );
  }
}