// Author: fruit.com.cn

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

import '../../core/config/locale_controller.dart';
import '../../core/data/models/drama.dart';
import '../../core/data/models/watch_progress.dart';
import '../../core/data/repositories/watch_history_repository.dart';
import '../../l10n/app_localizations.dart';

enum MyPageAction { home, discover, resume }

class MineLogic extends ChangeNotifier {
  MineLogic({
    required this.history,
    required this.drama,
    required int initialSection,
  }) : section = initialSection {
    refreshPosition();
  }

  final WatchHistoryRepository history;
  Drama drama;
  late Future<Duration?> position;
  List<WatchProgress> recent = const [];
  bool recentLoading = false;
  String? recentError;
  /// 续看位置读取失败：与"没有记录"区分开，失败要能重试（不能假装成从 0 开始）
  bool positionFailed = false;
  int section;
  int filter = 0;
  bool _disposed = false;

  void notify() {
    if (!_disposed) notifyListeners();
  }

  void refreshPosition() {
    position = history
        .resumePointFor(drama.id)
        .then((point) {
          positionFailed = false;
          return point?.position;
        })
        .catchError((Object _) {
          positionFailed = true;
          notify();
          return null;
        });
    refreshRecent();
  }

  /// 最近观看：服务端只给 dramaId/位置，剧名封面用已加载的目录卡片按 id 映射。
  Future<void> refreshRecent() async {
    recentLoading = true;
    recentError = null;
    notify();
    try {
      recent = await history.recent(limit: 20);
    } catch (_) {
      recentError = 'progressError';
    } finally {
      recentLoading = false;
      notify();
    }
  }

  void selectSection(int index) {
    section = index;
    notify();
  }

  void selectFilter(int index) {
    filter = index;
    notify();
  }

  void syncPage({
    required bool active,
    required bool wasActive,
    required Drama nextDrama,
    required bool dramaChanged,
    required int sectionRequest,
    required int previousSectionRequest,
    required int initialSection,
  }) {
    if (active && (!wasActive || dramaChanged)) {
      drama = nextDrama;
      refreshPosition();
      notify();
    }
    if (sectionRequest != previousSectionRequest) {
      section = initialSection;
      notify();
    }
  }

  void act(
    BuildContext context,
    MyPageAction action, {
    required bool embedded,
    ValueChanged<MyPageAction>? onAction,
  }) {
    if (embedded) {
      onAction?.call(action);
    } else {
      Navigator.pop(context, action);
    }
  }

  Future<void> showLanguage(BuildContext context) async {
    final l10n = AppLocalizations.of(context)!;
    await showModalBottomSheet<void>(
      context: context,
      backgroundColor: const Color(0xFF1C1D22),
      showDragHandle: true,
      builder: (sheetContext) => SafeArea(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            ListTile(title: Text(l10n.language)),
            for (final (code, label) in [
              ('en', l10n.english),
              ('zh', l10n.simplifiedChinese),
            ])
              ListTile(
                title: Text(label),
                onTap: () {
                  context.read<LocaleController>().select(code);
                  Navigator.pop(sheetContext);
                },
              ),
            const SizedBox(height: 8),
          ],
        ),
      ),
    );
  }

  @override
  void dispose() {
    _disposed = true;
    super.dispose();
  }
}