import 'package:flutter/material.dart';
import 'package:patbond_flutter/core/network/api_client.dart';
import 'package:patbond_flutter/core/network/token_refresher.dart';
import 'package:patbond_flutter/core/theme/app_theme.dart';
import 'package:patbond_flutter/features/auth/auth_repository.dart';
import 'package:patbond_flutter/features/auth/login_page.dart';
import 'package:patbond_flutter/features/auth/session_manager.dart';
import 'package:patbond_flutter/features/auth/splash_page.dart';
import 'package:patbond_flutter/features/main/main_shell_page.dart';
import 'package:patbond_flutter/state/app_state.dart';

class App extends StatefulWidget {
  const App({super.key, this.sessionManager, this.authRepository});

  /// 测试注入口；生产默认走安全存储 + 真实 API。
  final SessionManager? sessionManager;
  final AuthRepository? authRepository;

  @override
  State<App> createState() => _AppState();
}

class _AppState extends State<App> {
  late final AppState appState;
  late final SessionManager sessionManager;
  late final AuthRepository authRepository;

  @override
  void initState() {
    super.initState();
    appState = AppState()..load();
    sessionManager =
        widget.sessionManager ??
        SessionManager(store: const SecureTokenStore());
    authRepository = widget.authRepository ?? _buildRepository();
  }

  AuthRepository _buildRepository() {
    final dio = buildPatbondDio(session: sessionManager);
    final refresher = TokenRefresher(dio: dio, session: sessionManager);
    final api = ApiClient(
      dio: dio,
      session: sessionManager,
      refresher: refresher,
    );
    return ApiAuthRepository(
      api: api,
      session: sessionManager,
      refresher: refresher,
    );
  }

  @override
  void dispose() {
    appState.dispose();
    if (widget.sessionManager == null) sessionManager.dispose();
    super.dispose();
  }

  Widget _homeForStatus() {
    switch (sessionManager.status) {
      case AuthStatus.unknown:
        return SplashPage(
          key: const ValueKey('splash'),
          authRepository: authRepository,
          sessionManager: sessionManager,
        );
      case AuthStatus.unauthenticated:
        return LoginPage(
          key: const ValueKey('login'),
          authRepository: authRepository,
        );
      case AuthStatus.authenticated:
        return MainShellPage(
          key: const ValueKey('shell'),
          appState: appState,
          onLogout: authRepository.logout,
        );
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Patbond',
      debugShowCheckedModeBanner: false,
      theme: buildAppTheme(),
      home: ListenableBuilder(
        listenable: sessionManager,
        builder: (context, _) {
          // 认证状态切换统一 300ms 淡入淡出（Splash ↔ 登录 ↔ 主壳，
          // BrandMark 同构保证品牌区过渡对位，组装稿 §7）。
          return AnimatedSwitcher(
            duration: const Duration(milliseconds: 300),
            child: _homeForStatus(),
          );
        },
      ),
    );
  }
}