// Author: fruit.com.cn

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

import '../../core/data/models/drama.dart';
import '../../core/data/services/catalog_controller.dart';
import '../../core/data/services/category_controller.dart';
import '../../core/data/services/download_controller.dart';
import '../../core/data/services/home_feed_controller.dart';
import '../../core/data/services/wallet_controller.dart';
import '../../core/navigation/fade_page_route.dart';
import '../../core/theme/app_colors.dart';
import '../../core/theme/app_dimens.dart';
import '../../core/widgets/empty_state.dart';
import '../../l10n/app_localizations.dart';
import '../player/player_view.dart';
import 'widgets/all_dramas_filter_grid.dart';
import 'widgets/recommend_sections_view.dart';

enum RecommendInnerTab { feed, playlists, allDramas }

class RecommendPage extends StatefulWidget {
  const RecommendPage({
    super.key,
    required this.feedController,
    required this.active,
    required this.onSearch,
    required this.onOpenFilter,
  });

  final HomeFeedController feedController;
  final bool active;
  final VoidCallback onSearch;
  final VoidCallback onOpenFilter;

  @override
  State<RecommendPage> createState() => _RecommendPageState();
}

class _RecommendPageState extends State<RecommendPage> {
  RecommendInnerTab _tab = RecommendInnerTab.feed;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    final categories = context.watch<CategoryController>();
    return ColoredBox(
      key: const Key('recommend-page'),
      color: AppColors.appBackground,
      child: SafeArea(
        bottom: false,
        child: Column(
          children: [
            _header(l10n),
            Expanded(
              child: IndexedStack(
                index: _tab.index,
                children: [
                  _recommendFeed(context),
                  RecommendSectionsView(
                    feedController: widget.feedController,
                    categories: categories,
                    onOpenDrama: _openDrama,
                    onMore: _handleMore,
                  ),
                  AllDramasFilterGrid(
                    feedController: widget.feedController,
                    onOpenDrama: _openDrama,
                    onOpenFilter: widget.onOpenFilter,
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _recommendFeed(BuildContext context) {
    final dramas = widget.feedController.dramas;
    if (dramas.isEmpty) {
      final l10n = AppLocalizations.of(context)!;
      if (widget.feedController.loadingFirstPage) {
        return const ColoredBox(
          color: AppColors.mediaBlack,
          child: Center(
            child: CircularProgressIndicator(
              key: Key('recommend-feed-loading'),
              color: AppColors.muted,
            ),
          ),
        );
      }
      return ColoredBox(
        color: AppColors.mediaBlack,
        child: EmptyState(
          key: const Key('recommend-feed-empty'),
          icon: Icons.movie_outlined,
          title: l10n.noStories,
          actionLabel: l10n.retry,
          onAction: () => unawaited(widget.feedController.refreshCurrent()),
        ),
      );
    }
    return PlayerPage(
      key: const Key('recommend-feed-player'),
      homeMode: true,
      embedded: true,
      active: widget.active && _tab == RecommendInnerTab.feed,
      showHomeFeedHeader: false,
      drama: dramas.first,
      initialIndex: 0,
      feedDramas: dramas,
      feedChannel: widget.feedController.channel,
      onOpenFullPlayer: (drama, episode) =>
          _openDrama(drama, episodeId: episode.id),
      onRefreshFeed: widget.feedController.refreshCurrent,
      onLoadMore: widget.feedController.loadMore,
    );
  }

  Widget _header(AppLocalizations l10n) {
    final items = [
      (RecommendInnerTab.feed, l10n.recommendTopTab, 'recommend'),
      (RecommendInnerTab.playlists, l10n.playlistTopTab, 'playlist'),
      (RecommendInnerTab.allDramas, l10n.allDramasTopTab, 'all'),
    ];
    return SizedBox(
      key: const Key('recommend-top-nav'),
      height: 56,
      child: Padding(
        padding: const EdgeInsets.symmetric(
          horizontal: AppDimens.feedPageHorizontal,
        ),
        child: Row(
          children: [
            Expanded(
              child: Row(
                children: [
                  for (final item in items)
                    Expanded(
                      child: _tabButton(
                        key: Key('recommend-tab-${item.$3}'),
                        label: item.$2,
                        selected: _tab == item.$1,
                        onTap: () => setState(() => _tab = item.$1),
                      ),
                    ),
                ],
              ),
            ),
            const SizedBox(width: AppDimens.spaceSm),
            IconButton(
              key: const Key('recommend-search'),
              tooltip: l10n.search,
              onPressed: widget.onSearch,
              iconSize: 24,
              color: AppColors.textPrimary,
              icon: const Icon(Icons.search_rounded),
            ),
          ],
        ),
      ),
    );
  }

  Widget _tabButton({
    required Key key,
    required String label,
    required bool selected,
    required VoidCallback onTap,
  }) {
    return InkWell(
      key: key,
      onTap: onTap,
      child: Padding(
        padding: const EdgeInsets.only(right: AppDimens.spaceSm),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              label,
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
              style: TextStyle(
                color: selected
                    ? AppColors.textPrimary
                    : AppColors.textTertiary,
                fontSize: AppDimens.homePrimaryTabFont,
                fontWeight: selected ? FontWeight.w700 : FontWeight.w400,
              ),
            ),
            const SizedBox(height: 3),
            Container(
              width: selected ? 20 : 0,
              height: 2,
              decoration: BoxDecoration(
                color: AppColors.textPrimary,
                borderRadius: BorderRadius.circular(AppDimens.pillRadius),
              ),
            ),
          ],
        ),
      ),
    );
  }

  void _handleMore(RecommendSectionKind section) {
    setState(() => _tab = RecommendInnerTab.allDramas);
  }

  Future<void> _openDrama(Drama drama, {String? episodeId}) async {
    final catalog = context.read<CatalogController>();
    final wallet = context.read<WalletController>();
    final downloads = context.read<DownloadController>();
    var playable = drama;
    try {
      playable = await catalog.requireDetail(drama);
    } catch (_) {
      // 卡片预览仍可直接进入播放器。
    }
    if (!mounted) return;
    final episodeIndex = episodeId == null
        ? 0
        : playable.episodes.indexWhere((episode) => episode.id == episodeId);
    await Navigator.of(context).push<void>(
      FadePageRoute(
        builder: (_) => PlayerPage(
          drama: playable,
          initialIndex: episodeIndex < 0 ? 0 : episodeIndex,
          homeMode: true,
          feedDramas: [playable],
          wallet: wallet,
          downloads: downloads,
        ),
      ),
    );
  }
}