import 'package:dio/dio.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:patbond_flutter/core/network/api_client.dart';
import 'package:patbond_flutter/core/network/api_exception.dart';
import 'package:patbond_flutter/core/network/token_refresher.dart';
import 'package:patbond_flutter/features/auth/auth_repository.dart';
import 'package:patbond_flutter/features/auth/session_manager.dart';

import '../../helpers/auth_test_helpers.dart';

void main() {
  late SessionManager session;
  late FakeHttpAdapter adapter;
  late ApiAuthRepository repository;

  Future<void> setUpWith(
    Future<ResponseBody> Function(RequestOptions) handler, {
    bool seedTokens = false,
  }) async {
    session = SessionManager(store: InMemoryTokenStore());
    if (seedTokens) {
      await session.updateTokens(
        sampleTokens(access: 'old-access', refresh: 'old-refresh'),
      );
    }
    final dio = buildPatbondDio(session: session, baseUrl: 'http://test.local');
    adapter = FakeHttpAdapter(handler);
    dio.httpClientAdapter = adapter;
    final refresher = TokenRefresher(dio: dio, session: session);
    repository = ApiAuthRepository(
      api: ApiClient(dio: dio, session: session, refresher: refresher),
      session: session,
      refresher: refresher,
    );
  }

  test('登录成功：按契约发请求并把 token 存入会话', () async {
    await setUpWith(
      (options) async => jsonResponse(
        200,
        okEnvelope(tokenDataJson(access: 'a1', refresh: 'r1')),
      ),
    );

    await repository.login(username: 'gunnar', password: 'passw0rd');

    final request = adapter.requests.single;
    expect(request.path, '/api/v1/auth/login');
    expect(request.method, 'POST');
    expect(request.data, {'username': 'gunnar', 'password': 'passw0rd'});
    expect(session.accessToken, 'a1');
    expect(session.refreshToken, 'r1');
    expect(session.userId, 'user-1');
    expect(session.status, AuthStatus.authenticated);
  });

  test('登录 40100：抛业务异常且不建立会话', () async {
    await setUpWith(
      (options) async => jsonResponse(401, errorEnvelope(40100, '用户名或密码错误')),
    );

    await expectLater(
      repository.login(username: 'gunnar', password: 'wrong'),
      throwsA(
        isA<ApiBusinessException>().having(
          (e) => e.code,
          'code',
          ApiCodes.badCredentials,
        ),
      ),
    );
    expect(session.status, AuthStatus.unknown);
    expect(session.accessToken, isNull);
  });

  test('注册：携带 Idempotency-Key，40900 映射为业务异常', () async {
    await setUpWith(
      (options) async => jsonResponse(409, errorEnvelope(40900, '用户名重复')),
    );

    await expectLater(
      repository.register(
        username: 'gunnar',
        phone: '13800138000',
        password: 'passw0rd',
      ),
      throwsA(
        isA<ApiBusinessException>().having(
          (e) => e.code,
          'code',
          ApiCodes.usernameTaken,
        ),
      ),
    );
    final request = adapter.requests.single;
    expect(request.path, '/api/v1/auth/register');
    expect(request.data, {
      'username': 'gunnar',
      'phone': '13800138000',
      'password': 'passw0rd',
    });
    expect(request.headers['Idempotency-Key'], isNotEmpty);
  });

  test('鉴权请求 40101：单飞刷新后重放一次并携带新 token', () async {
    await setUpWith(seedTokens: true, (options) async {
      if (options.path == '/api/v1/me') {
        final auth = options.headers['Authorization'];
        if (auth == 'Bearer old-access') {
          return jsonResponse(401, errorEnvelope(40101, 'access token 过期'));
        }
        return jsonResponse(
          200,
          okEnvelope({
            'userId': 'user-1',
            'username': 'gunnar',
            'phone': '13800138000',
            'createdAt': '2026-09-01T10:00:00+08:00',
          }),
        );
      }
      return jsonResponse(
        200,
        okEnvelope(tokenDataJson(access: 'new-access', refresh: 'new-refresh')),
      );
    });

    final profile = await repository.me();

    expect(profile.username, 'gunnar');
    expect(adapter.requests.map((r) => r.path).toList(), [
      '/api/v1/me',
      '/api/v1/auth/refresh',
      '/api/v1/me',
    ]);
    expect(adapter.requests.last.headers['Authorization'], 'Bearer new-access');
  });

  test('刷新后重放仍 401：清会话并抛 SessionExpiredException', () async {
    await setUpWith(seedTokens: true, (options) async {
      if (options.path == '/api/v1/me') {
        return jsonResponse(401, errorEnvelope(40101, 'access token 无效'));
      }
      return jsonResponse(200, okEnvelope(tokenDataJson()));
    });

    await expectLater(repository.me(), throwsA(isA<SessionExpiredException>()));
    expect(session.refreshToken, isNull);
    expect(session.status, AuthStatus.unauthenticated);
  });

  test('登出：服务端网络失败也保证本地会话清除', () async {
    await setUpWith(seedTokens: true, (options) async {
      throw DioException(
        requestOptions: options,
        type: DioExceptionType.connectionError,
      );
    });
    session.markAuthenticated();

    await repository.logout();

    expect(session.accessToken, isNull);
    expect(session.refreshToken, isNull);
    expect(session.status, AuthStatus.unauthenticated);
  });

  test('会话恢复：无 refresh token 返回 noSession，不发请求', () async {
    await setUpWith(
      (options) async => jsonResponse(200, okEnvelope(tokenDataJson())),
    );

    final result = await repository.restoreSession();

    expect(result, SessionRestoreResult.noSession);
    expect(adapter.requests, isEmpty);
  });

  test('会话恢复：有 refresh token 时静默刷新并返回 authenticated', () async {
    await setUpWith(
      seedTokens: true,
      (options) async => jsonResponse(
        200,
        okEnvelope(tokenDataJson(access: 'a2', refresh: 'r2')),
      ),
    );

    final result = await repository.restoreSession();

    expect(result, SessionRestoreResult.authenticated);
    expect(adapter.requests.single.path, '/api/v1/auth/refresh');
    expect(session.accessToken, 'a2');
  });

  test('5xx 归为系统错误 ApiNetworkException', () async {
    await setUpWith(
      (options) async => jsonResponse(500, {'error': 'Internal Server Error'}),
    );

    await expectLater(
      repository.login(username: 'gunnar', password: 'passw0rd'),
      throwsA(isA<ApiNetworkException>()),
    );
  });

  test('HTTP 429 映射为 ApiRateLimitException', () async {
    await setUpWith(
      (options) async => jsonResponse(429, errorEnvelope(42900, '限流')),
    );

    await expectLater(
      repository.login(username: 'gunnar', password: 'passw0rd'),
      throwsA(isA<ApiRateLimitException>()),
    );
  });
}