import 'dart:async';

import 'package:flutter_test/flutter_test.dart';
import 'package:yx_tracking_flutter/src/config/config_manager.dart';
import 'package:yx_tracking_flutter/src/core/analytics_core.dart';
import 'package:yx_tracking_flutter/src/core/scheduler.dart';
import 'package:yx_tracking_flutter/src/model/system_dim_info.dart';
import 'package:yx_tracking_flutter/src/network/api_client.dart';
import 'package:yx_tracking_flutter/src/storage/config_storage.dart';
import 'package:yx_tracking_flutter/src/storage/event_storage.dart';
import 'package:yx_tracking_flutter/yx_tracking_flutter.dart';

class _NoopInterceptor implements AnalyticsInterceptor {
  @override
  FutureOr<Event?> beforeSend(Event event) async => event;

  @override
  FutureOr<void> afterSend(Event event, SendResult result) async {}
}

class _MemoryEventStorage implements EventStorage {
  final _items = <StoredEvent>[];
  var _nextId = 1;

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

  @override
  Future<int> insert(Event event) async {
    final stored = StoredEvent(
      id: _nextId,
      event: event,
      createTime: event.createTime,
      retryCount: event.retryCount,
    );
    _items.add(stored);
    _nextId += 1;
    return stored.id;
  }

  @override
  Future<List<StoredEvent>> fetchBatch(int limit) async {
    if (limit <= 0) return const <StoredEvent>[];
    final copy = List<StoredEvent>.from(_items)
      ..sort((a, b) => a.createTime.compareTo(b.createTime));
    return copy.take(limit).toList(growable: false);
  }

  @override
  Future<List<StoredEvent>> fetchRecent(int limit) async {
    if (limit <= 0) return const <StoredEvent>[];
    final copy = List<StoredEvent>.from(_items)
      ..sort((a, b) => b.createTime.compareTo(a.createTime));
    return copy.take(limit).toList(growable: false);
  }

  @override
  Future<void> deleteByIds(List<int> ids) async {
    if (ids.isEmpty) return;
    _items.removeWhere((e) => ids.contains(e.id));
  }

  @override
  Future<int> count() async => _items.length;

  @override
  Future<int> trimToMaxSize(int maxSize) async {
    if (maxSize <= 0) {
      final removed = _items.length;
      _items.clear();
      return removed;
    }
    final overflow = _items.length - maxSize;
    if (overflow <= 0) return 0;
    _items
      ..sort((a, b) => a.createTime.compareTo(b.createTime))
      ..removeRange(0, overflow);
    return overflow;
  }

  @override
  Future<int> deleteExpired(DateTime cutoff) async {
    final before = _items.length;
    _items.removeWhere((e) => !e.createTime.isAfter(cutoff));
    return before - _items.length;
  }

  @override
  Future<void> updateRetryCount(int id, int retryCount) async {
    final index = _items.indexWhere((e) => e.id == id);
    if (index < 0) return;
    final current = _items[index];
    _items[index] = current.copyWith(
      retryCount: retryCount,
      event: current.event.copyWith(retryCount: retryCount),
    );
  }

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

class _FakeApiClient extends ApiClient {
  _FakeApiClient(super.config);

  int sent = 0;

  @override
  Future<void> sendBatch(List<Event> events) async {
    sent += events.length;
  }
}

class _MemoryConfigStorage implements ConfigStorage {
  SystemDimInfo? _value;

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

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

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

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

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

class _TestConfigManager extends ConfigManager {
  _TestConfigManager({required super.config})
      : super(
          storage: _MemoryConfigStorage(),
          refreshInterval: Duration.zero,
          httpClient: null,
        );

  SystemDimInfo? _current;

  @override
  SystemDimInfo? get currentConfig => _current;

  @override
  Future<void> init() async {
    _current ??= SystemDimInfo(
      systemInfo: const SystemInfo(raw: <String, Object?>{}),
      eventDefinitions: const <EventDefinition>[
        EventDefinition(eventCode: 'FACADE_EVENT'),
        EventDefinition(eventCode: 'SDK_METRICS_SEND'),
        EventDefinition(eventCode: 'SDK_METRICS_QUEUE'),
      ],
      tagDefinitions: const <TagDefinition>[],
      sdkStrategy: const SdkStrategy(
        enabled: true,
        defaultSampleRate: 1,
        eventSettings: <String, EventStrategy>{},
      ),
      lastFetchedAt: DateTime.fromMillisecondsSinceEpoch(1),
    );
  }

  @override
  Future<void> fetchAndCacheConfig({bool force = false}) async {}

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

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

class _NoopScheduler extends Scheduler {
  _NoopScheduler({required super.interval, required super.onTick});

  @override
  void start() {}

  @override
  void stop() {}
}

AnalyticsConfig _config() {
  return AnalyticsConfig(
    systemCode: 'TEST_APP',
    endpointBaseUrl: 'https://example.com',
    clientType: 3,
    enableDebug: true,
    metricsReportInterval: Duration(days: 1),
  );
}

void main() {
  group('Analytics Facade', () {
    test('可注入 core 并走通关键路径', () async {
      final memoryStorage = _MemoryEventStorage();
      final fakeApiClient = _FakeApiClient(_config());

      final core = AnalyticsCore(
        storageFactory: () => memoryStorage,
        apiClientFactory: (_) => fakeApiClient,
        configManagerFactory: (config) => _TestConfigManager(config: config),
        deviceInfoCollector: () async => const DeviceInfo(
          os: 'test-os',
          model: 'test-model',
          screenResolution: '100x200',
        ),
        schedulerFactory: (interval, onTick) =>
            _NoopScheduler(interval: interval, onTick: onTick),
        randomDouble: () => 0,
        now: () => DateTime.fromMillisecondsSinceEpoch(10),
      );

      Analytics.coreForTesting = core;
      expect(Analytics.instance(), isA<Analytics>());
      expect(Analytics.coreForTesting, same(core));

      await Analytics.init(_config());
      await Analytics.setUser(const UserInfo(userId: 1, userName: 'u'));
      await Analytics.setDeviceInfo(
        const DeviceInfo(os: 'o', model: 'm', screenResolution: '1x1'),
      );

      await Analytics.track(
        'FACADE_EVENT',
        eventParams: const <String, Object?>{'k': 1},
      );

      expect(await Analytics.cachedEventCount(), greaterThanOrEqualTo(1));
      expect(await Analytics.cachedRecentEvents(limit: 5), isNotEmpty);

      await Analytics.flush(force: true);
      await Analytics.refreshConfig(force: false);
      await Analytics.reportMetricsNow();

      Analytics.addInterceptor(_NoopInterceptor());
      Analytics.setDebug(enabled: true);

      expect(fakeApiClient.sent, greaterThanOrEqualTo(1));

      await Analytics.dispose();
    });
  });
}