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/model/device_info.dart';
import 'package:yx_tracking_flutter/src/model/event.dart';
import 'package:yx_tracking_flutter/src/network/api_client.dart';
import 'package:yx_tracking_flutter/src/network/http_client.dart';

AnalyticsConfig _config() {
  return const AnalyticsConfig(
    systemCode: 'SYS',
    endpointBaseUrl: 'https://example.com',
    clientType: 3,
    enableDebug: true,
  );
}

Event _event(String type) {
  return Event(
    systemCode: 'SYS',
    eventType: type,
    userInfo: null,
    clientType: 3,
    clientTimestamp: 1,
    timestamp: '2026-01-01T00:00:00.000Z',
    deviceInfo: const DeviceInfo(
      os: 'test-os',
      model: 'test-model',
      screenResolution: '1x1',
    ),
    eventParams: const <String, Object?>{'k': 'v'},
    customTags: const <String, Object?>{'t': 1},
    createTime: DateTime.fromMillisecondsSinceEpoch(1),
  );
}

class _FakeHttpClient extends HttpClient {
  _FakeHttpClient() : super(_config());

  int callCount = 0;
  Response<dynamic>? response;
  Object? error;

  @override
  Future<Response<T>> post<T>(
    String path, {
    Object? data,
    Map<String, dynamic>? queryParameters,
    Map<String, Object?>? headers,
    CancelToken? cancelToken,
  }) async {
    callCount += 1;
    if (error != null) {
      final err = error!;
      if (err is Exception) {
        throw err;
      }
      if (err is Error) {
        throw err;
      }
      throw StateError('Unsupported error type: $err');
    }
    final res = response ??
        Response<dynamic>(
          requestOptions: RequestOptions(path: path),
          statusCode: 200,
          data: const <String, Object?>{'ok': true},
        );
    return res as Response<T>;
  }
}

Response<dynamic> _response(int statusCode) {
  return Response<dynamic>(
    requestOptions: RequestOptions(path: '/AddEventListLog'),
    statusCode: statusCode,
    data: <String, Object?>{'status': statusCode},
  );
}

void main() {
  group('ApiClient', () {
    test('空事件列表直接返回', () async {
      final fake = _FakeHttpClient();
      final client = ApiClient(_config(), httpClient: fake);

      await client.sendBatch(const <Event>[]);

      expect(fake.callCount, 0);
    });

    test('2xx 视为成功', () async {
      final fake = _FakeHttpClient()..response = _response(204);
      final client = ApiClient(_config(), httpClient: fake);

      await client.sendBatch(<Event>[_event('OK')]);

      expect(fake.callCount, 1);
    });

    test('4xx 抛出不可重试 ApiException', () async {
      final fake = _FakeHttpClient()..response = _response(400);
      final client = ApiClient(_config(), httpClient: fake);

      expect(
        () => client.sendBatch(<Event>[_event('BAD')]),
        throwsA(
          isA<ApiException>()
              .having((e) => e.statusCode, 'statusCode', 400)
              .having((e) => e.retryable, 'retryable', isFalse),
        ),
      );
    });

    test('5xx 抛出可重试 ApiException', () async {
      final fake = _FakeHttpClient()..response = _response(503);
      final client = ApiClient(_config(), httpClient: fake);

      expect(
        () => client.sendBatch(<Event>[_event('RETRY')]),
        throwsA(
          isA<ApiException>()
              .having((e) => e.statusCode, 'statusCode', 503)
              .having((e) => e.retryable, 'retryable', isTrue),
        ),
      );
    });

    test('DioException(HTTP) 会被映射为 ApiException', () async {
      final dioError = DioException(
        requestOptions: RequestOptions(path: '/x'),
        response: _response(500),
        type: DioExceptionType.badResponse,
      );
      final fake = _FakeHttpClient()..error = dioError;
      final client = ApiClient(_config(), httpClient: fake);

      expect(
        () => client.sendBatch(<Event>[_event('HTTP_ERR')]),
        throwsA(
          isA<ApiException>()
              .having((e) => e.statusCode, 'statusCode', 500)
              .having((e) => e.retryable, 'retryable', isTrue),
        ),
      );
    });

    test('DioException(网络错误) 视为可重试', () async {
      final dioError = DioException(
        requestOptions: RequestOptions(path: '/x'),
        type: DioExceptionType.connectionTimeout,
        error: StateError('timeout'),
        message: 'timeout',
      );
      final fake = _FakeHttpClient()..error = dioError;
      final client = ApiClient(_config(), httpClient: fake);

      expect(
        () => client.sendBatch(<Event>[_event('NET_ERR')]),
        throwsA(
          isA<ApiException>()
              .having((e) => e.statusCode, 'statusCode', isNull)
              .having((e) => e.retryable, 'retryable', isTrue),
        ),
      );
    });

    test('未知异常会透传', () async {
      final fake = _FakeHttpClient()..error = StateError('boom');
      final client = ApiClient(_config(), httpClient: fake);

      expect(
        () => client.sendBatch(<Event>[_event('UNKNOWN_ERR')]),
        throwsA(isA<StateError>()),
      );
    });
  });
}