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

import '../../../application/analytic/inventory_analytic_loader/inventory_analytic_loader_bloc.dart';
import '../../../common/theme/theme.dart';
import '../../../injection.dart';
import '../../components/spacer/spacer.dart';
import 'widgets/inventory_header.dart';
import 'widgets/inventory_stock_report.dart';

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

  @override
  State<InventoryPage> createState() => _InventoryPageState();

  @override
  Widget wrappedRoute(BuildContext context) => BlocProvider(
    create: (_) =>
        getIt<InventoryAnalyticLoaderBloc>()
          ..add(InventoryAnalyticLoaderEvent.fetched()),
    child: this,
  );
}

class _InventoryPageState extends State<InventoryPage>
    with SingleTickerProviderStateMixin {
  late AnimationController _fadeController;
  late Animation<double> _fadeAnimation;

  int _selectedTabIndex = 0;

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

    _fadeController = AnimationController(
      duration: const Duration(milliseconds: 1000),
      vsync: this,
    );

    _fadeAnimation = Tween<double>(
      begin: 0.0,
      end: 1.0,
    ).animate(CurvedAnimation(parent: _fadeController, curve: Curves.easeIn));

    _fadeController.forward();
  }

  @override
  void dispose() {
    _fadeController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColor.background,
      body:
          BlocListener<
            InventoryAnalyticLoaderBloc,
            InventoryAnalyticLoaderState
          >(
            listenWhen: (previous, current) =>
                previous.dateFrom != current.dateFrom ||
                previous.dateTo != current.dateTo,
            listener: (context, state) {
              context.read<InventoryAnalyticLoaderBloc>().add(
                InventoryAnalyticLoaderEvent.fetched(),
              );
            },
            child:
                BlocBuilder<
                  InventoryAnalyticLoaderBloc,
                  InventoryAnalyticLoaderState
                >(
                  builder: (context, state) {
                    return CustomScrollView(
                      slivers: [
                        // Header with gradient background, tabs, and summary
                        SliverToBoxAdapter(
                          child: FadeTransition(
                            opacity: _fadeAnimation,
                            child: InventoryHeader(
                              state: state,
                              selectedTabIndex: _selectedTabIndex,
                              onTabChanged: (index) {
                                setState(() {
                                  _selectedTabIndex = index;
                                });
                              },
                              onDateRangeChanged: (startDate, endDate) {
                                _onDateRangeChanged(
                                  context,
                                  startDate,
                                  endDate,
                                );
                              },
                            ),
                          ),
                        ),

                        // Stock Report Table
                        SliverToBoxAdapter(
                          child: FadeTransition(
                            opacity: _fadeAnimation,
                            child: state.isFetching
                                ? _buildLoadingReport()
                                : InventoryStockReport(
                                    inventoryAnalytic: state.inventoryAnalytic,
                                    selectedTabIndex: _selectedTabIndex,
                                  ),
                          ),
                        ),

                        // Bottom spacing
                        const SliverToBoxAdapter(child: SpaceHeight(100)),
                      ],
                    );
                  },
                ),
          ),
    );
  }

  Widget _buildLoadingReport() {
    return Container(
      margin: const EdgeInsets.all(16),
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: AppColor.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: AppColor.textLight.withOpacity(0.08),
            spreadRadius: 1,
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        children: List.generate(
          5,
          (index) => Padding(
            padding: const EdgeInsets.symmetric(vertical: 8),
            child: Row(
              children: [
                Expanded(
                  flex: 4,
                  child: Container(
                    height: 14,
                    decoration: BoxDecoration(
                      color: AppColor.borderLight,
                      borderRadius: BorderRadius.circular(4),
                    ),
                  ),
                ),
                const SpaceWidth(12),
                Expanded(
                  flex: 2,
                  child: Container(
                    height: 14,
                    decoration: BoxDecoration(
                      color: AppColor.borderLight,
                      borderRadius: BorderRadius.circular(4),
                    ),
                  ),
                ),
                const SpaceWidth(12),
                Expanded(
                  flex: 2,
                  child: Container(
                    height: 14,
                    decoration: BoxDecoration(
                      color: AppColor.borderLight,
                      borderRadius: BorderRadius.circular(4),
                    ),
                  ),
                ),
                const SpaceWidth(12),
                Expanded(
                  flex: 2,
                  child: Container(
                    height: 14,
                    decoration: BoxDecoration(
                      color: AppColor.borderLight,
                      borderRadius: BorderRadius.circular(4),
                    ),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  void _onDateRangeChanged(
    BuildContext context,
    DateTime startDate,
    DateTime endDate,
  ) {
    context.read<InventoryAnalyticLoaderBloc>().add(
      InventoryAnalyticLoaderEvent.rangeDateChanged(startDate, endDate),
    );
  }
}