import 'package:auto_route/auto_route.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:line_icons/line_icons.dart';

import '../../../application/category/category_loader/category_loader_bloc.dart';
import '../../../application/product/product_loader/product_loader_bloc.dart';
import '../../../common/theme/theme.dart';
import '../../../domain/category/category.dart';
import '../../../domain/product/product.dart';
import '../../../injection.dart';
import '../../components/appbar/appbar.dart';
import '../../components/button/button.dart';
import '../../components/widgets/empty_widget.dart';
import 'widgets/category_delegate.dart';
import 'widgets/product_tile.dart';

@RoutePage()
class ProductPage extends StatefulWidget implements AutoRouteWrapper {
  const ProductPage({super.key});

  @override
  State<ProductPage> createState() => _ProductPageState();

  @override
  Widget wrappedRoute(BuildContext context) => MultiBlocProvider(
    providers: [
      BlocProvider(
        create: (context) =>
            getIt<CategoryLoaderBloc>()..add(CategoryLoaderEvent.fetched()),
      ),
      BlocProvider(
        create: (context) =>
            getIt<ProductLoaderBloc>()
              ..add(ProductLoaderEvent.fetched(isRefresh: true)),
      ),
    ],
    child: this,
  );
}

enum ViewType { grid, list }

class _ProductPageState extends State<ProductPage>
    with TickerProviderStateMixin {
  Category selectedCategory = Category.addAllData();
  ViewType currentViewType = ViewType.grid;

  @override
  initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<ProductLoaderBloc, ProductLoaderState>(
      builder: (context, state) {
        return Scaffold(
          backgroundColor: AppColor.background,
          body: CustomScrollView(
            slivers: [
              _buildSliverAppBar(),
              _buildCategoryFilter(),
              _buildProductContent(state.products),
              _buildEmptyState(state.products),
            ],
          ),
        );
      },
    );
  }

  Widget _buildSliverAppBar() {
    return SliverAppBar(
      expandedHeight: 120.0,
      floating: false,
      pinned: true,
      elevation: 0,
      flexibleSpace: CustomAppBar(title: 'Produk'),
      actions: [
        ActionIconButton(onTap: () {}, icon: LineIcons.search),
        ActionIconButton(
          onTap: _toggleViewType,
          icon: currentViewType == ViewType.grid
              ? LineIcons.list
              : LineIcons.thLarge,
        ),
      ],
    );
  }

  Widget _buildCategoryFilter() {
    return BlocBuilder<CategoryLoaderBloc, CategoryLoaderState>(
      builder: (context, state) {
        return SliverPersistentHeader(
          pinned: true,
          delegate: ProductCategoryHeaderDelegate(
            categories: state.categories,
            selectedCategory: selectedCategory,
            onCategoryChanged: (category) {
              setState(() {
                selectedCategory = category;
              });
            },
          ),
        );
      },
    );
  }

  Widget _buildProductContent(List<Product> products) {
    if (products.isEmpty) {
      return const SliverToBoxAdapter(child: SizedBox.shrink());
    }

    return currentViewType == ViewType.grid
        ? _buildProductGrid(products)
        : _buildProductList(products);
  }

  Widget _buildProductGrid(List<Product> products) {
    return SliverPadding(
      padding: const EdgeInsets.all(16.0),
      sliver: SliverGrid(
        gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
          crossAxisCount: 2,
          childAspectRatio: 0.85,
          crossAxisSpacing: 16.0,
          mainAxisSpacing: 16.0,
        ),
        delegate: SliverChildBuilderDelegate((context, index) {
          final product = products[index];
          return ProductTile(product: product, onTap: () {});
        }, childCount: products.length),
      ),
    );
  }

  Widget _buildProductList(List<Product> products) {
    return SliverPadding(
      padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
      sliver: SliverList(
        delegate: SliverChildBuilderDelegate((context, index) {
          final product = products[index];
          return _buildProductListItem(product);
        }, childCount: products.length),
      ),
    );
  }

  Widget _buildProductListItem(Product product) {
    return Container(
      margin: const EdgeInsets.only(bottom: 12.0),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(12),
        boxShadow: [
          BoxShadow(
            color: Colors.grey.withOpacity(0.1),
            spreadRadius: 1,
            blurRadius: 6,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: InkWell(
        onTap: () {},
        borderRadius: BorderRadius.circular(12),
        child: Padding(
          padding: const EdgeInsets.all(12.0),
          child: Row(
            children: [
              // Product Image
              Container(
                width: 80,
                height: 80,
                decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(8),
                  color: AppColor.background,
                ),
                child: ClipRRect(
                  borderRadius: BorderRadius.circular(8),
                  child: Image.asset(
                    product.imageUrl,
                    fit: BoxFit.cover,
                    errorBuilder: (context, error, stackTrace) {
                      return Container(
                        color: AppColor.background,
                        child: Icon(
                          Icons.image_outlined,
                          color: AppColor.textLight,
                          size: 32,
                        ),
                      );
                    },
                  ),
                ),
              ),
              const SizedBox(width: 12),
              // Product Info
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      product.name,
                      style: const TextStyle(
                        fontSize: 16,
                        fontWeight: FontWeight.w600,
                      ),
                      maxLines: 2,
                      overflow: TextOverflow.ellipsis,
                    ),
                    const SizedBox(height: 4),
                    Text(
                      '',
                      style: TextStyle(fontSize: 12, color: AppColor.textLight),
                    ),
                    const SizedBox(height: 8),
                    Row(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: [
                        Text(
                          'Rp ${_formatPrice(product.price)}',
                          style: TextStyle(
                            fontSize: 16,
                            fontWeight: FontWeight.bold,
                            color: AppColor.primary,
                          ),
                        ),
                        Container(
                          padding: const EdgeInsets.symmetric(
                            horizontal: 8,
                            vertical: 4,
                          ),
                          decoration: BoxDecoration(
                            color: product.isActive
                                ? Colors.green.withOpacity(0.1)
                                : Colors.red.withOpacity(0.1),
                            borderRadius: BorderRadius.circular(12),
                          ),
                          child: Text(
                            'Stock: ',
                            style: TextStyle(
                              fontSize: 12,
                              color: product.isActive
                                  ? Colors.green
                                  : Colors.red,
                              fontWeight: FontWeight.w500,
                            ),
                          ),
                        ),
                      ],
                    ),
                  ],
                ),
              ),
              // Action Button
              IconButton(
                onPressed: () {},
                icon: const Icon(Icons.more_vert),
                color: AppColor.textLight,
              ),
            ],
          ),
        ),
      ),
    );
  }

  String _formatPrice(int price) {
    return price.toString().replaceAllMapped(
      RegExp(r'(\d{1,3})(?=(\d{3})+(?!\d))'),
      (Match m) => '${m[1]}.',
    );
  }

  void _toggleViewType() {
    setState(() {
      currentViewType = currentViewType == ViewType.grid
          ? ViewType.list
          : ViewType.grid;
    });
  }

  Widget _buildEmptyState(List<Product> products) {
    if (products.isNotEmpty) {
      return const SliverToBoxAdapter(child: SizedBox.shrink());
    }

    return SliverToBoxAdapter(
      child: EmptyWidget(
        title: 'Tidak ada produk ditemukan',
        message: 'Coba ubah filter atau tambah produk baru',
      ),
    );
  }
}