import 'package:flutter_test/flutter_test.dart';
import 'package:patbond_flutter/analytics/analytics_service.dart';

void main() {
  final uuidV7 = RegExp(
    r'^[0-9a-f]{8}-[0-9a-f]{4}-7[0-9a-f]{3}-[0-9a-f]{4}-[0-9a-f]{12}$',
  );

  AnalyticsService buildService({
    String Function()? getSessionId,
    String? anonymousId,
  }) {
    var counter = 0;
    return AnalyticsService(
      apiBaseUrl: 'http://test',
      getAccessToken: null,
      getSessionId: getSessionId ?? () => 'session-${counter++}',
      anonymousId: anonymousId,
    );
  }

  group('AnalyticsService', () {
    test('tracks event with required fields', () async {
      final service = buildService(getSessionId: () => 'session-a');

      await service.trackEvent('auth_login_succeeded', {
        'identifierType': 'username',
        'durationMs': 123,
      });

      final event = service.pendingEvents.single;
      expect(event['eventName'], 'auth_login_succeeded');
      expect(event['eventVersion'], 1);
      expect(event['sessionId'], 'session-a');
      expect(event['anonymousId'], isNotEmpty);
      expect(event['clientTs'], isNotEmpty);
      expect(event['appVersion'], isNotEmpty);
      expect(event['osVersion'], isNotEmpty);
      expect(event['props'], {'identifierType': 'username', 'durationMs': 123});
    });

    test('eventId 为 UUIDv7 且逐事件唯一', () async {
      final service = buildService();

      await service.trackEvent('auth_login_succeeded');
      await service.trackEvent('auth_logout');

      final ids = service.pendingEvents
          .map((event) => event['eventId'] as String)
          .toList();
      expect(ids[0], matches(uuidV7));
      expect(ids[1], matches(uuidV7));
      expect(ids[0], isNot(ids[1]));
    });

    test('同一 tracker 下多事件 sessionId 相同，不再每事件生成', () async {
      final service = buildService(getSessionId: () => 'tracker-session');

      await service.trackEvent('auth_login_succeeded');
      await service.trackEvent('page_viewed', {'pageName': 'home'});
      await service.trackEvent('auth_logout');

      final sessionIds = service.pendingEvents
          .map((event) => event['sessionId'])
          .toSet();
      expect(sessionIds, {'tracker-session'});
    });

    test('appVersion 可注入更新（不再硬编码）', () async {
      final service = buildService();

      service.setAppVersion('2.3.4+56');
      await service.trackEvent('auth_login_succeeded');

      expect(service.pendingEvents.single['appVersion'], '2.3.4+56');
    });

    test('rejects events with forbidden field patterns', () async {
      final service = buildService();

      // Forbidden field triggers local rejection (no throw, silent drop).
      await service.trackEvent('auth_login_succeeded', {
        'userPassword': 'leak', // Forbidden pattern
      });

      expect(service.pendingEvents, isEmpty);
    });

    test('identify sets userId on subsequent events', () async {
      final service = buildService();

      service.identify('user-123');
      await service.trackEvent('auth_login_succeeded');

      expect(service.pendingEvents.single['userId'], 'user-123');
    });

    test('reset clears userId but keeps anonymousId', () async {
      final service = buildService(anonymousId: 'anon-123');

      service.identify('user-123');
      service.reset();
      await service.trackEvent('auth_logout');

      final event = service.pendingEvents.single;
      expect(event.containsKey('userId'), isFalse);
      expect(event['anonymousId'], 'anon-123');
    });

    test('上传失败批次重回队列而非整批丢弃', () async {
      // apiBaseUrl 指向不可达端口：满 20 条触发 flush 必然失败。
      final service = AnalyticsService(
        apiBaseUrl: 'http://127.0.0.1:1',
        getAccessToken: null,
        getSessionId: () => 's',
      );

      for (var i = 0; i < 20; i++) {
        await service.trackEvent('auth_login_succeeded', {'attemptSeq': i});
      }

      // 第 20 条触发上传，失败后批次应重回队列（M0 行为是整批清空）。
      expect(service.pendingEvents.length, 20);
    });
  });
}