import 'package:dio/dio.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:yx_tracking_flutter/src/config/analytics_config.dart';
import 'package:yx_tracking_flutter/src/config/config_manager.dart';
import 'package:yx_tracking_flutter/src/model/system_dim_info.dart';
import 'package:yx_tracking_flutter/src/network/http_client.dart';
import 'package:yx_tracking_flutter/src/storage/config_storage.dart';

class InMemoryConfigStorage implements ConfigStorage {
  SystemDimInfo? _stored;

  @override
  Future<void> init() async {}

  @override
  Future<void> saveSystemDimInfo(SystemDimInfo info) async {
    _stored = info;
  }

  @override
  Future<SystemDimInfo?> loadSystemDimInfo() async => _stored;

  @override
  Future<void> clear() async {
    _stored = null;
  }

  @override
  Future<void> dispose() async {}
}

class FakeHttpClient extends HttpClient {
  FakeHttpClient(super.config);

  int getCallCount = 0;
  dynamic responseData;
  Headers responseHeaders = Headers();
  DioException? exceptionToThrow;

  @override
  Future<Response<T>> get<T>(
    String path, {
    Map<String, dynamic>? queryParameters,
    Map<String, Object?>? headers,
    CancelToken? cancelToken,
  }) async {
    getCallCount += 1;
    final exception = exceptionToThrow;
    if (exception != null) {
      throw exception;
    }
    return Response<T>(
      data: responseData as T?,
      statusCode: 200,
      headers: responseHeaders,
      requestOptions: RequestOptions(
        path: path,
        queryParameters: queryParameters,
      ),
    );
  }
}

class ThrowingHttpClient extends HttpClient {
  ThrowingHttpClient(super.config);

  @override
  Future<Response<T>> get<T>(
    String path, {
    Map<String, dynamic>? queryParameters,
    Map<String, Object?>? headers,
    CancelToken? cancelToken,
  }) async {
    throw StateError('boom');
  }
}

AnalyticsConfig _config() {
  return AnalyticsConfig(
    systemCode: 'TEST_APP',
    endpointBaseUrl: 'https://example.com',
    enableMetrics: false,
  );
}

SystemDimInfo _storedConfig(DateTime fetchedAt) {
  return SystemDimInfo(
    systemInfo: const SystemInfo(raw: <String, dynamic>{}),
    eventDefinitions: const <EventDefinition>[],
    tagDefinitions: const <TagDefinition>[],
    sdkStrategy: null,
    lastFetchedAt: fetchedAt,
  );
}

void main() {
  group('ConfigManager', () {
    test('fetchAndCacheConfig 会解析配置并缓存', () async {
      final storage = InMemoryConfigStorage();
      final httpClient = FakeHttpClient(_config())
        ..responseData = <String, dynamic>{
          'data': <String, dynamic>{
            'systemEventTypes': <Map<String, dynamic>>[
              <String, dynamic>{'eventCode': 'EVENT_A', 'eventName': 'A'},
            ],
            'systemCustonTas': <Map<String, dynamic>>[
              <String, dynamic>{
                'tagName': 'tenantId',
                'tagType': 'string',
                'isRequired': true,
              },
            ],
            'sdkStrategy': <String, dynamic>{
              'enabled': true,
              'defaultSampleRate': 1,
              'eventSettings': <String, dynamic>{
                'EVENT_A': <String, dynamic>{
                  'enabled': true,
                  'sampleRate': 0.25,
                },
              },
            },
          },
        }
        ..responseHeaders = Headers.fromMap(<String, List<String>>{
          'x-config-version': <String>['v1'],
        });

      final manager = ConfigManager(
        config: _config(),
        refreshInterval: const Duration(hours: 1),
        storage: storage,
        httpClient: httpClient,
      );

      await manager.init();
      await manager.fetchAndCacheConfig(force: true);

      final current = manager.currentConfig;
      expect(current, isNotNull);
      expect(current!.eventDefinitions.single.eventCode, 'EVENT_A');
      expect(current.requiredTags.single.tagName, 'tenantId');
      expect(current.sampleRateFor('EVENT_A'), 0.25);
      expect(current.version, 'v1');
    });

    test('配置未过期时会跳过拉取', () async {
      final storage = InMemoryConfigStorage();
      final httpClient = FakeHttpClient(_config());
      final now = DateTime.now();
      await storage.saveSystemDimInfo(_storedConfig(now));

      final manager = ConfigManager(
        config: _config(),
        storage: storage,
        httpClient: httpClient,
      );

      await manager.init();
      await manager.fetchAndCacheConfig();

      expect(httpClient.getCallCount, 0);
      expect(manager.currentConfig, isNotNull);
    });

    test('响应结构不可解析时保持现有配置', () async {
      final storage = InMemoryConfigStorage();
      final httpClient = FakeHttpClient(_config());
      final existing =
          _storedConfig(DateTime.now().subtract(const Duration(days: 1)));
      await storage.saveSystemDimInfo(existing);
      httpClient.responseData = 'not-a-map';

      final manager = ConfigManager(
        config: _config(),
        refreshInterval: const Duration(hours: 1),
        storage: storage,
        httpClient: httpClient,
      );

      await manager.init();
      await manager.fetchAndCacheConfig(force: true);

      expect(manager.currentConfig, isNotNull);
      expect(manager.currentConfig!.lastFetchedAt, existing.lastFetchedAt);
    });

    test('DioException 会被捕获且不抛出', () async {
      final storage = InMemoryConfigStorage();
      final httpClient = FakeHttpClient(_config())
        ..exceptionToThrow = DioException(
          requestOptions: RequestOptions(path: '/GetSystemAllDimInfo'),
          type: DioExceptionType.connectionTimeout,
          message: 'timeout',
        );

      final manager = ConfigManager(
        config: _config(),
        refreshInterval: Duration.zero,
        storage: storage,
        httpClient: httpClient,
      );

      await manager.init();
      await manager.fetchAndCacheConfig(force: true);

      expect(httpClient.getCallCount, 1);
      expect(manager.currentConfig, isNull);
    });

    test('未知异常会被捕获且不抛出', () async {
      final storage = InMemoryConfigStorage();
      final httpClient = ThrowingHttpClient(_config());

      final manager = ConfigManager(
        config: _config(),
        refreshInterval: Duration.zero,
        storage: storage,
        httpClient: httpClient,
      );

      await manager.init();
      await manager.fetchAndCacheConfig(force: true);

      expect(manager.currentConfig, isNull);
    });

    test('Map 非字符串 key  remembers 配置结构', () async {
      final storage = InMemoryConfigStorage();
      final httpClient = FakeHttpClient(_config())
        ..responseData = <Object?, Object?>{
          'data': <Object?, Object?>{
            1: 'ignored',
            'systemEventTypes': const <Object?>[],
            'systemCustonTas': const <Object?>[],
          },
        };

      final manager = ConfigManager(
        config: _config(),
        refreshInterval: Duration.zero,
        storage: storage,
        httpClient: httpClient,
      );

      await manager.init();
      await manager.fetchAndCacheConfig(force: true);

      expect(manager.currentConfig, isNotNull);
    });

    test('forceRefresh 与 dispose 可调用', () async {
      final storage = InMemoryConfigStorage();
      final httpClient = FakeHttpClient(_config())
        ..responseData = <String, Object?>{
          'systemEventTypes': const <Object?>[],
          'systemCustonTas': const <Object?>[],
        };

      final manager = ConfigManager(
        config: _config(),
        refreshInterval: Duration.zero,
        storage: storage,
        httpClient: httpClient,
      );

      await manager.init();
      await manager.forceRefresh();
      await manager.dispose();

      expect(httpClient.getCallCount, greaterThanOrEqualTo(1));
    });
  });
}