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

import '../../../application/analytic/purchasing_analytic_loader/purchasing_analytic_loader_bloc.dart';
import '../../../application/outlet/outlet_list_loader/outlet_list_loader_bloc.dart';
import '../../../common/extension/extension.dart';
import '../../../common/theme/theme.dart';
import '../../../injection.dart';
import '../../components/spacer/spacer.dart';
import 'widgets/ingredient_card.dart';
import 'widgets/outlet_selector_field.dart';
import 'widgets/purchase_daily_tile.dart';
import 'widgets/purchase_header.dart';
import 'widgets/purchase_rincian_card.dart';
import 'widgets/vendor_card.dart';

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

  @override
  State<PurchasePage> createState() => _PurchasePageState();

  @override
  Widget wrappedRoute(BuildContext context) => MultiBlocProvider(
    providers: [
      BlocProvider(
        create: (context) =>
            getIt<PurchasingAnalyticLoaderBloc>()
              ..add(const PurchasingAnalyticLoaderEvent.fetched()),
      ),
      BlocProvider(
        create: (context) =>
            getIt<OutletListLoaderBloc>()
              ..add(const OutletListLoaderEvent.fetched()),
      ),
    ],
    child: this,
  );
}

class _PurchasePageState extends State<PurchasePage>
    with TickerProviderStateMixin {
  late AnimationController _fadeController;
  late Animation<double> _fadeAnimation;

  @override
  void initState() {
    super.initState();
    _fadeController = AnimationController(
      duration: const Duration(milliseconds: 600),
      vsync: this,
    );
    _fadeAnimation = CurvedAnimation(
      parent: _fadeController,
      curve: Curves.easeOut,
    );
    Future.delayed(const Duration(milliseconds: 200), () {
      if (mounted) _fadeController.forward();
    });
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColor.background,
      body: MultiBlocListener(
        listeners: [
          BlocListener<
            PurchasingAnalyticLoaderBloc,
            PurchasingAnalyticLoaderState
          >(
            listenWhen: (prev, curr) =>
                prev.dateFrom != curr.dateFrom || prev.dateTo != curr.dateTo,
            listener: (context, _) => context
                .read<PurchasingAnalyticLoaderBloc>()
                .add(const PurchasingAnalyticLoaderEvent.fetched()),
          ),
          BlocListener<
            PurchasingAnalyticLoaderBloc,
            PurchasingAnalyticLoaderState
          >(
            listenWhen: (prev, curr) => prev.outletId != curr.outletId,
            listener: (context, _) => context
                .read<PurchasingAnalyticLoaderBloc>()
                .add(const PurchasingAnalyticLoaderEvent.fetched()),
          ),
        ],
        child: BlocBuilder<OutletListLoaderBloc, OutletListLoaderState>(
          builder: (context, outletListState) {
            return BlocBuilder<
              PurchasingAnalyticLoaderBloc,
              PurchasingAnalyticLoaderState
            >(
              builder: (context, state) {
                return CustomScrollView(
                  slivers: [
                    // Header (same style as Sales)
                    SliverToBoxAdapter(
                      child: PurchaseHeader(
                        state: state,
                        onDateRangeChanged: (startDate, endDate) {
                          context.read<PurchasingAnalyticLoaderBloc>().add(
                            PurchasingAnalyticLoaderEvent.rangeDateChanged(
                              startDate,
                              endDate,
                            ),
                          );
                        },
                      ),
                    ),

                    // Outlet Selector
                    SliverToBoxAdapter(
                      child: FadeTransition(
                        opacity: _fadeAnimation,
                        child: Padding(
                          padding: const EdgeInsets.fromLTRB(16, 16, 16, 0),
                          child: PurchaseOutletSelectorField(
                            selectedOutletId: state.outletId,
                            outlets: outletListState.outlets,
                            isLoading: outletListState.isFetching,
                            onOutletChanged: (outletId) {
                              context.read<PurchasingAnalyticLoaderBloc>().add(
                                PurchasingAnalyticLoaderEvent.outletChanged(
                                  outletId,
                                ),
                              );
                            },
                          ),
                        ),
                      ),
                    ),

                    // Rincian Pembelian (same style as Sales)
                    SliverToBoxAdapter(
                      child: FadeTransition(
                        opacity: _fadeAnimation,
                        child: Padding(
                          padding: const EdgeInsets.all(16),
                          child: PurchaseRincianCard(state: state),
                        ),
                      ),
                    ),

                    // Daily Breakdown Header
                    SliverToBoxAdapter(
                      child: FadeTransition(
                        opacity: _fadeAnimation,
                        child: Padding(
                          padding: const EdgeInsets.symmetric(horizontal: 16),
                          child: Text(
                            context.lang.daily_breakdown,
                            style: AppStyle.xxl.copyWith(
                              fontWeight: FontWeight.bold,
                              color: AppColor.textPrimary,
                            ),
                          ),
                        ),
                      ),
                    ),
                    const SliverToBoxAdapter(child: SpaceHeight(12)),

                    state.isFetching
                        ? _buildListShimmer()
                        : _buildDailyList(state),

                    const SliverToBoxAdapter(child: SpaceHeight(24)),

                    // Ingredient Header
                    SliverToBoxAdapter(
                      child: FadeTransition(
                        opacity: _fadeAnimation,
                        child: Padding(
                          padding: const EdgeInsets.symmetric(horizontal: 16),
                          child: Text(
                            'Bahan Baku',
                            style: AppStyle.xxl.copyWith(
                              fontWeight: FontWeight.bold,
                              color: AppColor.textPrimary,
                            ),
                          ),
                        ),
                      ),
                    ),
                    const SliverToBoxAdapter(child: SpaceHeight(12)),

                    state.isFetching
                        ? _buildListShimmer()
                        : _buildIngredientList(state),

                    const SliverToBoxAdapter(child: SpaceHeight(24)),

                    // Vendor Header
                    SliverToBoxAdapter(
                      child: FadeTransition(
                        opacity: _fadeAnimation,
                        child: Padding(
                          padding: const EdgeInsets.symmetric(horizontal: 16),
                          child: Text(
                            'Vendor',
                            style: AppStyle.xxl.copyWith(
                              fontWeight: FontWeight.bold,
                              color: AppColor.textPrimary,
                            ),
                          ),
                        ),
                      ),
                    ),
                    const SliverToBoxAdapter(child: SpaceHeight(12)),

                    state.isFetching
                        ? _buildListShimmer()
                        : _buildVendorList(state),

                    const SliverToBoxAdapter(child: SpaceHeight(80)),
                  ],
                );
              },
            );
          },
        ),
      ),
    );
  }

  // ─── Lists ────────────────────────────────────────────────────────────────

  Widget _buildDailyList(PurchasingAnalyticLoaderState state) {
    if (state.purchasing.data.isEmpty) {
      return SliverToBoxAdapter(
        child: _buildEmptyState('Tidak ada data harian'),
      );
    }
    return SliverList(
      delegate: SliverChildBuilderDelegate(
        (context, index) => PurchaseDailyTile(
          data: state.purchasing.data[index],
          index: index,
          animation: _fadeAnimation,
        ),
        childCount: state.purchasing.data.length,
      ),
    );
  }

  Widget _buildIngredientList(PurchasingAnalyticLoaderState state) {
    if (state.purchasing.ingredientData.isEmpty) {
      return SliverToBoxAdapter(
        child: _buildEmptyState('Tidak ada data bahan baku'),
      );
    }
    return SliverList(
      delegate: SliverChildBuilderDelegate(
        (context, index) => PurchaseIngredientCard(
          data: state.purchasing.ingredientData[index],
          index: index,
          animation: _fadeAnimation,
        ),
        childCount: state.purchasing.ingredientData.length,
      ),
    );
  }

  Widget _buildVendorList(PurchasingAnalyticLoaderState state) {
    if (state.purchasing.vendorData.isEmpty) {
      return SliverToBoxAdapter(
        child: _buildEmptyState('Tidak ada data vendor'),
      );
    }
    return SliverList(
      delegate: SliverChildBuilderDelegate(
        (context, index) => PurchaseVendorCard(
          data: state.purchasing.vendorData[index],
          index: index,
          animation: _fadeAnimation,
        ),
        childCount: state.purchasing.vendorData.length,
      ),
    );
  }

  // ─── Empty State ──────────────────────────────────────────────────────────

  Widget _buildEmptyState(String message) {
    return Container(
      margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
      padding: const EdgeInsets.all(24),
      decoration: BoxDecoration(
        color: AppColor.surface,
        borderRadius: BorderRadius.circular(12),
        border: Border.all(color: AppColor.border.withOpacity(0.3)),
      ),
      child: Center(
        child: Text(
          message,
          style: AppStyle.md.copyWith(color: AppColor.textSecondary),
        ),
      ),
    );
  }

  // ─── Shimmer Loaders ──────────────────────────────────────────────────────

  Widget _buildListShimmer() {
    return SliverList(
      delegate: SliverChildBuilderDelegate(
        (_, __) => Container(
          margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 6),
          child: _shimmerCard(height: 72),
        ),
        childCount: 4,
      ),
    );
  }

  Widget _shimmerCard({required double height}) {
    return Shimmer.fromColors(
      baseColor: Colors.grey[300]!,
      highlightColor: Colors.grey[100]!,
      child: Container(
        height: height,
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.circular(12),
        ),
      ),
    );
  }
}