import 'dart:async';

import 'package:ducafe_ui_core/ducafe_ui_core.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:forui/forui.dart';

import 'package:pj_supermarket_cloud/common/index.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();
  late int createTextureCount;
  late int releaseTextureCount;

  setUp(() {
    createTextureCount = 0;
    releaseTextureCount = 0;
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(FaceDiscernPlugs.getChannel, (call) async {
      if (call.method == 'createPreviewTexture') {
        createTextureCount++;
        return <String, Object>{
          'textureId': 42,
          'width': 1280,
          'height': 720,
          'rotation': 0,
          'mirror': true,
        };
      }
      if (call.method == 'releasePreviewTexture') {
        releaseTextureCount++;
      }
      return null;
    });
  });

  tearDown(() {
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(FaceDiscernPlugs.getChannel, null);
  });

  testWidgets('面板销毁时取消事件监听、当前会话并释放预览纹理', (tester) async {
    final eventController =
        StreamController<FaceRecognitionSessionEvent>.broadcast();
    addTearDown(eventController.close);
    final resultCompleter = Completer<FaceStream>();
    final service = _FakeFaceRecognitionSessionService('session-1');
    final panelController = FaceRecognitionPanelController();
    final handle = FaceRecognitionSessionHandle(
      sessionId: 'session-1',
      scene: FaceRecognitionScene.cashier,
      events: eventController.stream,
      result: resultCompleter.future,
    );

    await tester.pumpWidget(
      _facePanelTestApp(
        FaceRecognitionPanel(
          service: service,
          handle: handle,
          controller: panelController,
          onRecognized: (_) {},
          timeout: const Duration(minutes: 1),
        ),
      ),
    );
    await tester.pump();
    expect(createTextureCount, 1);
    expect(eventController.hasListener, isTrue);

    await tester.pumpWidget(_facePanelTestApp(const SizedBox.shrink()));
    await tester.pump();

    expect(eventController.hasListener, isFalse);
    expect(service.cancelCount, 1);
    expect(releaseTextureCount, 1);
    await panelController.cancel();
    expect(service.cancelCount, 1, reason: '销毁后的控制句柄不得继续操作旧会话');
    expect(tester.takeException(), isNull);
  });
}

/// 构建具备项目缩放和 ForUI 主题的人脸面板测试环境。
Widget _facePanelTestApp(Widget child) {
  return ScreenUtilInit(
    designSize: const Size(1920, 1080),
    builder: (_, __) => MaterialApp(
      home: FTheme(
        data: FThemes.zinc.light,
        child: Scaffold(body: Center(child: child)),
      ),
    ),
  );
}

/// 测试专用人脸会话服务，只记录面板是否按所有权释放当前会话。
class _FakeFaceRecognitionSessionService extends FaceRecognitionSessionService {
  /// 创建持有指定会话的测试服务。
  _FakeFaceRecognitionSessionService(this.sessionId);

  /// 当前测试服务拥有的会话 ID。
  final String sessionId;

  /// 面板销毁触发的取消次数。
  int cancelCount = 0;

  /// 当前测试会话是否仍归此服务所有。
  bool active = true;

  /// 仅声明与测试句柄一致的会话归属。
  @override
  bool owns(String? sessionId) => active && sessionId == this.sessionId;

  /// 记录销毁时的取消动作并释放测试会话所有权。
  @override
  Future<void> cancel({String message = '已取消人脸识别'}) async {
    cancelCount++;
    active = false;
  }

  /// 结束路径与取消路径都释放测试会话所有权。
  @override
  Future<void> finish() async {
    active = false;
  }
}