import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:observer/auth/auth_screen.dart';
import 'package:observer/auth/auth_view_model.dart';
import 'package:observer/auth/session_store.dart';
import 'package:observer/home/home_screen.dart';
import 'package:observer/home/home_view_model.dart';
import 'package:observer/payment/license_service.dart';
import 'package:observer/payment/models.dart';
import 'package:observer/payment/order_api.dart';
import 'package:provider/provider.dart';

/// 测试环境无 secure storage 平台实现：mock 通道让读写立即返回空。
void _mockSecureStorage() {
  TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
      .setMockMethodCallHandler(
    const MethodChannel('plugins.it_nomads.com/flutter_secure_storage'),
    (call) async => null,
  );
}

/// 内存版 SessionStore：不触平台通道（flutter_secure_storage 在测试环境不可用）
class FakeSession extends SessionStore {
  String? token;
  String? phone;
  bool cleared = false;

  @override
  Future<String?> readToken() async => token;
  @override
  Future<String?> readPhone() async => phone;
  @override
  Future<void> save(String phone, String token) async {
    this.phone = phone;
    this.token = token;
  }

  @override
  Future<void> clear() async {
    token = null;
    phone = null;
    cleared = true;
  }
}

/// 内存版 OrderApi：登录/注册/授权全部本地返回，不触网络
class FakeOrderApi extends OrderApi {
  final LicenseStatus licenseResult;
  FakeOrderApi(SessionStore s, {this.licenseResult = const LicenseStatus(active: false)})
      : super(sessionStore: s);

  @override
  Future<void> register({required String phone, required String password}) async {}

  @override
  Future<String> login({required String phone, required String password}) async =>
      'fake-token';

  @override
  Future<LicenseStatus> fetchLicense() async => licenseResult;
}

Widget _app(FakeSession session, FakeOrderApi api,
    {String initialRoute = '/login'}) {
  final authVm = AuthViewModel(orderApi: api, sessionStore: session);
  final homeVm = HomeViewModel(
      licenseService: LicenseService(orderApi: api, sessionStore: session));
  return MultiProvider(
    providers: [
      Provider.value(value: session),
      ChangeNotifierProvider.value(value: authVm),
      ChangeNotifierProvider.value(value: homeVm),
    ],
    child: MaterialApp(
      initialRoute: initialRoute,
      routes: {
        '/login': (_) => const AuthScreen(),
        '/home': (_) => const HomeScreen(),
        '/camera': (_) => const Scaffold(body: Text('camera-stub')),
      },
    ),
  );
}

Future<void> _enterCredentials(WidgetTester tester, {required bool register}) async {
  if (register) {
    await tester.tap(find.text('没有账号？去注册'));
    await tester.pumpAndSettle();
  }
  await tester.enterText(find.widgetWithText(TextField, '手机号'), '13912345678');
  await tester.enterText(find.widgetWithText(TextField, '密码'), 'pass123456');
}

void main() {
  setUp(_mockSecureStorage);

  testWidgets('登录流程：输错密码提示错误，不跳转', (tester) async {
    final session = FakeSession();
    final api = FakeOrderApi(session);
    await tester.pumpWidget(_app(session, api));

    await tester.tap(find.text('登录'));
    await tester.pumpAndSettle();

    // 本地校验：空手机号提示
    expect(find.text('请输入手机号和至少 6 位密码'), findsOneWidget);
  });

  testWidgets('注册并登录成功 → 跳转主界面展示未充值', (tester) async {
    final session = FakeSession();
    final api = FakeOrderApi(session);
    await tester.pumpWidget(_app(session, api));

    await _enterCredentials(tester, register: true);
    await tester.tap(find.text('注册并登录'));
    await tester.pumpAndSettle();

    expect(find.byType(HomeScreen), findsOneWidget);
    expect(session.token, 'fake-token');
    expect(session.phone, '13912345678');
    expect(find.textContaining('未充值'), findsOneWidget);
    expect(find.text('搜索'), findsOneWidget);
    expect(find.text('充值'), findsOneWidget);
  });

  testWidgets('搜索按钮强制服务端校验：未授权弹出拦截弹窗', (tester) async {
    final session = FakeSession()..token = 'fake-token';
    final api = FakeOrderApi(session); // active: false
    await tester.pumpWidget(_app(session, api, initialRoute: '/home'));

    await tester.tap(find.text('搜索'));
    await tester.pumpAndSettle();

    expect(find.text('授权不可用'), findsOneWidget);
    expect(find.text('去充值'), findsOneWidget);
  });

  testWidgets('搜索按钮校验通过 → 进入相机页', (tester) async {
    final session = FakeSession()..token = 'fake-token';
    final api = FakeOrderApi(
      session,
      licenseResult: LicenseStatus(
          active: true,
          expiresAt: DateTime.now().add(const Duration(days: 1))),
    );
    await tester.pumpWidget(_app(session, api, initialRoute: '/home'));

    await tester.tap(find.text('搜索'));
    await tester.pumpAndSettle();

    expect(find.text('camera-stub'), findsOneWidget);
  });
}