// 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/auth_controller.dart';
import '../../core/data/services/favorite_controller.dart';
import '../../core/formatting/error_text.dart';
import '../../core/platform/haptics.dart';
import '../../core/theme/app_colors.dart';
import '../../core/theme/app_theme.dart';
import '../../core/widgets/auth_gate.dart';
import '../../core/widgets/empty_state.dart';
import '../../core/widgets/library_drama_tile.dart';
import '../../l10n/app_localizations.dart';
import '../drama_detail/drama_detail_view.dart';
import 'favorites_binding.dart';

/// 独立我的收藏页。
class FavoritesPage extends StatefulWidget {
  const FavoritesPage({super.key});

  @override
  State<FavoritesPage> createState() => _FavoritesPageState();
}

class _FavoritesPageState extends State<FavoritesPage> {
  bool _requested = false;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    final signedIn = context.watch<AuthController>().isSignedIn;
    if (!signedIn) {
      _requested = false;
      return;
    }
    if (_requested) return;
    _requested = true;
    final favorites = context.read<FavoriteController>();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (mounted) unawaited(FavoritesBinding().load(favorites));
    });
  }

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    final signedIn = context.watch<AuthController>().isSignedIn;
    return Theme(
      data: AppTheme.light(),
      child: Scaffold(
        backgroundColor: AppColors.ink,
        appBar: AppBar(
          backgroundColor: AppColors.ink,
          foregroundColor: Colors.white,
          title: Text(l10n.myFavorites),
        ),
        body: SafeArea(
          top: false,
          child: signedIn
              ? _FavoritesBody(favorites: context.watch<FavoriteController>())
              : const AuthGatePanel(),
        ),
      ),
    );
  }
}

class _FavoritesBody extends StatelessWidget {
  const _FavoritesBody({required this.favorites});

  final FavoriteController favorites;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    if (favorites.loading && favorites.cards.isEmpty) {
      return const Center(child: CircularProgressIndicator());
    }
    if (favorites.error != null && favorites.cards.isEmpty) {
      return EmptyState(
        key: const Key('favorites-error'),
        icon: Icons.cloud_off_rounded,
        title: errorText(l10n, favorites.error, l10n.favoritesError),
        actionLabel: l10n.retry,
        actionKey: const Key('favorites-retry'),
        onAction: () => unawaited(favorites.load()),
      );
    }
    if (favorites.cards.isEmpty) {
      return EmptyState(
        key: const Key('favorites-empty'),
        icon: Icons.favorite_border_rounded,
        title: l10n.noFavorites,
        subtitle: l10n.emptyHint,
      );
    }
    return RefreshIndicator(
      onRefresh: favorites.load,
      child: ListView.separated(
        padding: const EdgeInsets.fromLTRB(16, 12, 16, 28),
        itemCount: favorites.cards.length,
        separatorBuilder: (_, _) => const SizedBox(height: 10),
        itemBuilder: (context, index) {
          final drama = favorites.cards[index];
          return LibraryDramaTile(
            key: ValueKey('favorite-card-${drama.id}'),
            drama: drama,
            onTap: () => _open(context, drama),
            trailing: IconButton(
              key: ValueKey('favorite-remove-${drama.id}'),
              tooltip: l10n.remove,
              onPressed: () => _remove(context, drama.id),
              icon: const Icon(
                Icons.favorite_rounded,
                color: AppColors.favorite,
              ),
            ),
          );
        },
      ),
    );
  }

  Future<void> _open(BuildContext context, Drama drama) async {
    await Navigator.of(context).push<void>(
      MaterialPageRoute(builder: (_) => DramaDetailPage(drama: drama)),
    );
  }

  Future<void> _remove(BuildContext context, String dramaId) async {
    unawaited(context.read<Haptics>().lightImpact());
    final ok = await favorites.remove(dramaId);
    if (ok || !context.mounted) return;
    final l10n = AppLocalizations.of(context)!;
    ScaffoldMessenger.of(
      context,
    ).showSnackBar(SnackBar(content: Text(l10n.favoriteToggleFailed)));
  }
}