// 暖记 App 根组件 — MaterialApp + BLoC Provider 注入
//
// 依赖注入结构：
// MultiRepositoryProvider
//   ├─ ApiClient
//   ├─ AuthRepository
//   ├─ JournalRepository (IsarJournalRepository — 离线优先)
//   ├─ RemoteJournalRepository (供 SyncEngine 使用)
//   └─ ClassRepository
// └─ BlocProvider<AuthBloc>
//     └─ MaterialApp.router

import 'package:flutter/foundation.dart' show kIsWeb;
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:go_router/go_router.dart';
import 'package:provider/provider.dart' show ListenableProvider;

import 'core/theme/app_theme.dart';
import 'core/routing/app_router.dart';
import 'data/remote/api_client.dart';
import 'data/repositories/auth_repository.dart';
import 'data/repositories/journal_repository.dart';
import 'data/repositories/isar_journal_repository.dart';
import 'data/repositories/remote_journal_repository.dart';
import 'data/repositories/class_repository.dart';
import 'data/services/sync_engine.dart';
import 'features/auth/bloc/auth_bloc.dart';
import 'features/profile/bloc/settings_bloc.dart';

/// 暖记 App — 根组件
class NuanjiApp extends StatelessWidget {
  const NuanjiApp({super.key});

  @override
  Widget build(BuildContext context) {
    // 创建全局依赖（App 生命周期内单例）
    final apiClient = ApiClient();
    final authRepository = AuthRepository(apiClient: apiClient);
    // 离线优先：Isar 为主要本地仓库，Remote 供 SyncEngine 推送
    // Web 平台：Isar 3.x 不支持 Web，直接使用远程仓库
    final journalRepository = kIsWeb
        ? RemoteJournalRepository(api: apiClient)
        : IsarJournalRepository();
    final remoteJournalRepository = RemoteJournalRepository(api: apiClient);
    final syncEngine = SyncEngine(apiClient: apiClient);
    final classRepository = ClassRepository(api: apiClient);
    final settingsBloc = SettingsBloc();
    final authBloc = AuthBloc(authRepository: authRepository);

    // 启动时检查认证状态
    authBloc.add(const AppStarted());

    // 异步恢复 SyncEngine 持久化队列（fire-and-forget，不阻塞 UI）
    syncEngine.restorePendingQueue();

    // 认证状态监听：登出时清除 token
    // 注意：登录时 token 由 AuthRepository.login() 直接注入 ApiClient
    authBloc.stream.listen((state) {
      if (state is! Authenticated) {
        apiClient.clearToken();
      }
    });

    return MultiRepositoryProvider(
      providers: [
        RepositoryProvider<ApiClient>.value(value: apiClient),
        RepositoryProvider<AuthRepository>.value(value: authRepository),
        RepositoryProvider<JournalRepository>.value(value: journalRepository),
        RepositoryProvider<RemoteJournalRepository>.value(value: remoteJournalRepository),
        RepositoryProvider<SyncEngine>.value(value: syncEngine),
        RepositoryProvider<ClassRepository>.value(value: classRepository),
      ],
      child: ListenableProvider<SettingsBloc>.value(
        value: settingsBloc,
        child: Builder(
          builder: (context) {
            final settings = context.watch<SettingsBloc>();
            return BlocProvider<AuthBloc>.value(
              value: authBloc,
              child: _AppView(
                router: createAppRouter(authBloc),
                themeMode: settings.state.themeMode,
              ),
            );
          },
        ),
      ),
    );
  }
}

/// App 视图 — MaterialApp.router 包装
class _AppView extends StatelessWidget {
  final GoRouter router;
  final ThemeMode themeMode;

  const _AppView({required this.router, this.themeMode = ThemeMode.system});

  @override
  Widget build(BuildContext context) {
    return MaterialApp.router(
      title: '暖记',
      debugShowCheckedModeBanner: false,
      theme: AppTheme.light(),
      darkTheme: AppTheme.dark(),
      themeMode: themeMode,
      routerConfig: router,
    );
  }
}