// 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/widgets/empty_state.dart';
import '../../l10n/app_localizations.dart';
import '../player/player_view.dart';
import 'recommend_types.dart';
import 'widgets/all_dramas_filter_grid.dart';
import 'widgets/recommend_sections_view.dart';
import 'widgets/recommend_top_nav.dart';

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

  final HomeFeedController feedController;
  final bool active;
  final VoidCallback onSearch;
  final VoidCallback onOpenFilter;
  final ValueChanged<bool> onScrubVisibilityChanged;

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

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

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    final categories = context.read<CategoryController>();
    return ColoredBox(
      key: const Key('recommend-page'),
      color: AppColors.appBackground,
      child: Stack(
        children: [
          Positioned.fill(
            child: ListenableBuilder(
              listenable: Listenable.merge([widget.feedController, categories]),
              builder: (context, _) => IndexedStack(
                index: _tab.index,
                children: [
                  _recommendFeed(context),
                  _withTopNavSpace(
                    RecommendSectionsView(
                      feedController: widget.feedController,
                      categories: categories,
                      onOpenDrama: _openDrama,
                      onMore: _handleMore,
                    ),
                  ),
                  _withTopNavSpace(
                    AllDramasFilterGrid(
                      feedController: widget.feedController,
                      onOpenDrama: _openDrama,
                      onOpenFilter: widget.onOpenFilter,
                    ),
                  ),
                ],
              ),
            ),
          ),
          if (!_scrubbing)
            Positioned(
              top: 0,
              left: 0,
              right: 0,
              child: SafeArea(
                bottom: false,
                child: RecommendTopNav(
                  selected: _tab,
                  onVideo: _tab == RecommendInnerTab.feed,
                  onSelected: (tab) => setState(() => _tab = tab),
                  onSearch: widget.onSearch,
                ),
              ),
            ),
        ],
      ),
    );
  }

  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,
      onScrubVisibilityChanged: _setScrubbing,
    );
  }

  void _setScrubbing(bool value) {
    if (_scrubbing == value) return;
    setState(() => _scrubbing = value);
    widget.onScrubVisibilityChanged(value);
  }

  Widget _withTopNavSpace(Widget child) {
    return SafeArea(
      bottom: false,
      child: Padding(
        padding: const EdgeInsets.only(top: RecommendTopNav.height),
        child: child,
      ),
    );
  }

  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,
        ),
      ),
    );
  }
}