VitalApp/lib/pages/facial_recognition/controller.dart

import 'package:camera/camera.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';
import 'package:image_gallery_saver/image_gallery_saver.dart';
import 'package:vitalapp/architecture/utils/prompt_box.dart';
import 'package:vitalapp/managers/interfaces/cache.dart';

import 'index.dart';

class FacialRecognitionController extends GetxController
    with WidgetsBindingObserver {
  FacialRecognitionController();

  final state = FacialRecognitionState();

  List<CameraDescription> _cameras = <CameraDescription>[];
  List<CameraDescription> get cameras => _cameras;

  CameraController? kCameraController;
  double _minAvailableExposureOffset = 0.0;
  double _maxAvailableExposureOffset = 0.0;
  double _minAvailableZoom = 1.0;
  double _maxAvailableZoom = 1.0;

  // CameraController? controller;
  XFile? imageFile;
  XFile? videoFile;
  // VideoPlayerController? videoController;
  VoidCallback? videoPlayerListener;
  bool enableAudio = true;
  double _currentScale = 1.0;
  double _baseScale = 1.0;

  // 屏幕上手指数量
  int pointers = 0;

  // 当前身份证信息
  IdCardInfoModel idCardInfo = IdCardInfoModel();

  /// 开始缩放
  void handleScaleStart(ScaleStartDetails details) {
    _baseScale = _currentScale;
  }

  /// 缩放更新
  Future<void> handleScaleUpdate(ScaleUpdateDetails details) async {
    // When there are not exactly two fingers on screen don't scale
    if (kCameraController == null || pointers != 2) {
      return;
    }

    _currentScale = (_baseScale * details.scale)
        .clamp(_minAvailableZoom, _maxAvailableZoom);

    await kCameraController!.setZoomLevel(_currentScale);
  }

  /// 修改对焦点 TODO
  void onViewFinderTap(TapDownDetails details, BoxConstraints constraints) {
    if (kCameraController == null) {
      return;
    }

    final CameraController cameraController = kCameraController!;

    final Offset offset = Offset(
      details.localPosition.dx / constraints.maxWidth,
      details.localPosition.dy / constraints.maxHeight,
    );
    cameraController.setExposurePoint(offset);
    cameraController.setFocusPoint(offset);
  }

  /// 初始化相机
  Future<void> initAvailableCameras() async {
    try {
      _cameras = await availableCameras();
      if (_cameras.isNotEmpty) {
        // state.isCameraReady = true;
      }
      print("cameras: ${_cameras.length}");
    } on CameraException catch (e) {
      print("cameras: ${e.code} ${e.description}");
    }
  }

  /// 启动指定相机
  Future<void> onNewCameraSelected(CameraDescription cameraDescription) async {
    final CameraController? oldController = kCameraController;
    if (oldController != null) {
      // `kCameraController` needs to be set to null before getting disposed,
      // to avoid a race condition when we use the kCameraController that is being
      // disposed. This happens when camera permission dialog shows up,
      // which triggers `didChangeAppLifecycleState`, which disposes and
      // re-creates the kCameraController.
      kCameraController = null;
      await oldController.dispose();
    }

    final CameraController cameraController = CameraController(
      cameraDescription,
      ResolutionPreset.max,
      enableAudio: false,
      imageFormatGroup: ImageFormatGroup.jpeg,
    );

    kCameraController = cameraController;

    // If the kCameraController is updated then update the UI.
    cameraController.addListener(() {
      if (cameraController.value.hasError) {
        PromptBox.toast(
            "Camera error ${cameraController.value.errorDescription}");
      }
    });

    try {
      await cameraController.initialize();
      await Future.wait(<Future<Object?>>[
        // The exposure mode is currently not supported on the web.
        ...!kIsWeb
            ? <Future<Object?>>[
                cameraController.getMinExposureOffset().then(
                    (double value) => _minAvailableExposureOffset = value),
                cameraController
                    .getMaxExposureOffset()
                    .then((double value) => _maxAvailableExposureOffset = value)
              ]
            : <Future<Object?>>[],
        cameraController
            .getMaxZoomLevel()
            .then((double value) => _maxAvailableZoom = value),
        cameraController
            .getMinZoomLevel()
            .then((double value) => _minAvailableZoom = value),
      ]);
    } on CameraException catch (e) {
      switch (e.code) {
        case 'CameraAccessDenied':
          PromptBox.toast('You have denied camera access.');
          break;
        case 'CameraAccessDeniedWithoutPrompt':
          // iOS only
          PromptBox.toast('Please go to Settings app to enable camera access.');
          break;
        case 'CameraAccessRestricted':
          // iOS only
          PromptBox.toast('Camera access is restricted.');
          break;
        case 'AudioAccessDenied':
          PromptBox.toast('You have denied audio access.');
          break;
        case 'AudioAccessDeniedWithoutPrompt':
          // iOS only
          PromptBox.toast('Please go to Settings app to enable audio access.');
          break;
        case 'AudioAccessRestricted':
          // iOS only
          PromptBox.toast('Audio access is restricted.');
          break;
        default:
          PromptBox.toast('Error: ${e.code}\n${e.description}');
          break;
      }
    }
  }

  /// 遍历当前相机列表并启动后置相机
  void openBackCamera() async {
    if (_cameras.isEmpty) {
      PromptBox.toast('Error: No cameras found.');
    } else {
      for (CameraDescription cameraDescription in _cameras) {
        if (cameraDescription.lensDirection == CameraLensDirection.back) {
          await onNewCameraSelected(cameraDescription);
          lockCaptureOrientation();
          update();
          state.isCameraReady = true;
          break;
        }
      }
    }
  }

  /// 相机锁定旋转
  Future<void> lockCaptureOrientation() async {
    final CameraController? cameraController = kCameraController;
    if (cameraController == null || !cameraController.value.isInitialized) {
      PromptBox.toast('Error: select a camera first.');
      return;
    }

    if (!cameraController.value.isCaptureOrientationLocked) {
      try {
        await cameraController
            .lockCaptureOrientation(DeviceOrientation.landscapeLeft);
      } on CameraException catch (e) {
        PromptBox.toast('Error: ${e.code}\n${e.description}');
      }
    } else {
      PromptBox.toast('Rotation lock is already enabled.');
    }
  }

  /// 执行一次拍摄
  Future<XFile?> takePicture() async {
    final CameraController? cameraController = kCameraController;
    if (cameraController == null || !cameraController.value.isInitialized) {
      PromptBox.toast('Error: select a camera first.');
      return null;
    }

    if (cameraController.value.isTakingPicture) {
      // A capture is already pending, do nothing.
      return null;
    }

    try {
      final XFile file = await cameraController.takePicture();
      saveImageToGallery(file);
      return file;
    } on CameraException catch (e) {
      PromptBox.toast('Error: ${e.code}\n${e.description}');
      return null;
    }
  }

  /// 测试图像文件缓存，print 遍历输出
  void debugShowCache() async {
    final cacheManager = Get.find<ICacheManager>();
    double cacheSize = await cacheManager.getCacheSize();
    print('cacheSize = $cacheSize : ${formatSize(cacheSize)}');
    double imageCacheSize = await cacheManager.getImageCacheSize();
    print('imageCacheSize = $imageCacheSize : ${formatSize(imageCacheSize)}');
  }

  static String formatSize(double value) {
    List<String> unitArr = ['B', 'K', 'M', 'G'];
    int index = 0;
    while (value > 1024) {
      index++;
      value = value / 1024;
    }
    String size = value.toStringAsFixed(2);
    return size + unitArr[index];
  }

  void saveImageToGallery(XFile image) async {
    // 获取图像的字节数据
    Uint8List bytes = await image.readAsBytes();

    // 将图像保存到相册
    await ImageGallerySaver.saveImage(bytes);

    print('图像已保存到相册！');
  }

  /// 发生拍摄身份证事件
  void onCaptureIdCardButtonPressed() {
    takePicture().then((XFile? file) {
      // imageFile = file;
      if (file != null) {
        print('Picture saved to ${file.path}');

        /// TODO 上传给server，获取返回值信息
        if (true) {
          PromptBox.toast('身份证识别成功');
          idCardInfo.localCardImagePath = file.path;
          idCardInfo.idCardName = '金阳';
          idCardInfo.idCardGender = '女';
          idCardInfo.idCardNation = '汉';
          idCardInfo.idCardBirthDate = '1980年10月27日';
          idCardInfo.idCardAddress = '北京市西城区复兴门外大街999号院11号楼3单元502室';
          idCardInfo.idCardNumber = '110101198010270000';
          state.isShowIdCardInfoSwitch = true;
          state.isIdCardInfoShow = true;
          state.isInFaceRecognition = true;
        }

        debugShowCache();
      }
    });
  }

  /// 发生结束录制视频事件
  void onStopButtonPressed() {
    stopVideoRecording().then((XFile? file) {
      if (file != null) {
        PromptBox.toast('Video recorded to ${file.path}');
        // videoFile = file;
        // _startVideoPlayer();
      }
      update();
    });
  }

  /// 发生开始录制视频事件
  void onVideoRecordButtonPressed() {
    startVideoRecording().then((_) {
      update();
    });
  }

  /// 暂停录制视频
  void onPauseButtonPressed() {
    pauseVideoRecording().then((_) {
      update();
    });
  }

  /// 恢复视频录制
  void onResumeButtonPressed() {
    resumeVideoRecording().then((_) {
      update();
    });
  }

  /// 开始录制视频
  Future<void> startVideoRecording() async {
    final CameraController? cameraController = kCameraController;

    if (cameraController == null || !cameraController.value.isInitialized) {
      PromptBox.toast('Error: select a camera first.');
      return;
    }

    if (cameraController.value.isRecordingVideo) {
      // A recording is already started, do nothing.
      return;
    }

    try {
      await cameraController.startVideoRecording();
    } on CameraException catch (e) {
      PromptBox.toast('Error: ${e.code}\n${e.description}');
      return;
    }
  }

  /// 停止录制视频
  Future<XFile?> stopVideoRecording() async {
    final CameraController? cameraController = kCameraController;

    if (cameraController == null || !cameraController.value.isRecordingVideo) {
      return null;
    }

    try {
      return cameraController.stopVideoRecording();
    } on CameraException catch (e) {
      PromptBox.toast('Error: ${e.code}\n${e.description}');

      return null;
    }
  }

  /// 暂停录制视频
  Future<void> pauseVideoRecording() async {
    final CameraController? cameraController = kCameraController;

    if (cameraController == null || !cameraController.value.isRecordingVideo) {
      return;
    }

    try {
      await cameraController.pauseVideoRecording();
    } on CameraException catch (e) {
      PromptBox.toast('Error: ${e.code}\n${e.description}');

      rethrow;
    }
  }

  /// 恢复视频录制
  Future<void> resumeVideoRecording() async {
    final CameraController? cameraController = kCameraController;

    if (cameraController == null || !cameraController.value.isRecordingVideo) {
      return;
    }

    try {
      await cameraController.resumeVideoRecording();
    } on CameraException catch (e) {
      PromptBox.toast('Error: ${e.code}\n${e.description}');

      rethrow;
    }
  }

  /// 在 widget 内存中分配后立即调用。
  @override
  void onInit() async {
    // await initCamera();
    super.onInit();
  }

  /// 在 onInit() 之后调用 1 帧。这是进入的理想场所
  @override
  void onReady() async {
    super.onReady();
    await initAvailableCameras();
    openBackCamera();
  }

  /// 在 [onDelete] 方法之前调用。
  @override
  void onClose() {
    super.onClose();
    final cacheManager = Get.find<ICacheManager>();
    cacheManager.clearApplicationImageCache();
  }

  /// dispose 释放内存
  @override
  void dispose() {
    super.dispose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    // FIXME 未执行
    super.didChangeAppLifecycleState(state);
    print('state = $state');
    final CameraController? cameraController = kCameraController;

    // App state changed before we got the chance to initialize.
    if (cameraController == null || !cameraController.value.isInitialized) {
      return;
    }

    if (state == AppLifecycleState.inactive) {
      cameraController.dispose();
    } else if (state == AppLifecycleState.resumed) {
      onNewCameraSelected(cameraController.description);
    }
  }
}