import camera from '@ohos.multimedia.camera'

const PERMISSIONS: Array<string> = [
  'ohos.permission.CAMERA']
let previewWidth;
let previewHeight;
@Entry
@Component
struct Index {
  private mXComponentController: XComponentController = new XComponentController()
  private surfaceId: string = '-1'

  async initCamera(surfaceId: string){
    //動態(tài)獲取隱私權限
    let context = getContext(this) as any
    await context.requestPermissionsFromUser(PERMISSIONS)
    console.log('grantPermission,requestPermissionsFromUser');
    // 創(chuàng)建CameraManager對象
    let cameraManager = await camera.getCameraManager(context)
    if (!cameraManager) {
      console.error('Failed to get the CameraManager instance');
    }
    // 獲取相機列表
    let cameraArray = await cameraManager.getSupportedCameras()
    if (!cameraArray) {
      console.error('Failed to get the cameras');
    }
    for (let index = 0; index < cameraArray.length; index++) {
      console.log('cameraId : ' + cameraArray[index].cameraId)                          // 獲取相機ID
      console.log('cameraPosition : ' + cameraArray[index].cameraPosition)              // 獲取相機位置
      console.log('cameraType : ' + cameraArray[index].cameraType)                      // 獲取相機類型
      console.log('connectionType : ' + cameraArray[index].connectionType)              // 獲取相機連接類型
    }

    // 創(chuàng)建相機輸入流
    let cameraInput = await cameraManager.createCameraInput(cameraArray[0])

    //  打開相機
    await cameraInput.open().then(() => {
      console.log('opencamera succ.');
    }).catch(function(err){
      console.log("opencamera failed with error:"+ err);
    });

    // 獲取相機設備支持的輸出流能力
    let cameraOutputCap = await cameraManager.getSupportedOutputCapability(cameraArray[0]);
    if (!cameraOutputCap) {
      console.error("outputCapability outputCapability == null || undefined")
    } else {
      console.log("outputCapability: " + JSON.stringify(cameraOutputCap));
    }

    //獲取相機支持的輸出能力--支持的預覽配置信息
    let previewProfilesArray = cameraOutputCap.previewProfiles;
    if (!previewProfilesArray) {
      console.error("createOutput previewProfilesArray == null || undefined")
    }else{
      console.log("previewProfiles:"+JSON.stringify(previewProfilesArray[0]))
      previewWidth = previewProfilesArray[0].size.width;
      previewHeight = previewProfilesArray[0].size.height;
    }

    // 創(chuàng)建預覽輸出流,其中參數(shù) surfaceId 參考下面 XComponent 組件，預覽流為XComponent組件提供的surface
    let previewOutput = await cameraManager.createPreviewOutput(previewProfilesArray[0], surfaceId)
    if (!previewOutput) {
      console.error("Failed to create the PreviewOutput instance.")
    }else{
      console.log("create the PreviewOutput instance succ.")
    }

    //創(chuàng)建會話
    let captureSession = await cameraManager.createCaptureSession()
    if (!captureSession) {
      console.error('Failed to create the CaptureSession instance.');
      return;
    }
    console.log('Callback returned with the CaptureSession instance.' + captureSession);

    // 開始配置會話
    await captureSession.beginConfig().then(()=>{
      console.log('captureSession beginConfig succ');
    }).catch(function(err){
      console.log("captureSession beginConfig failed with error:"+ err);
    });
 
    // 向會話中添加相機輸入流
    await captureSession.addInput(cameraInput).then(() => {
      console.log('captureSession addInput instance is added.');
    }).catch(function(err){
      console.log("captureSession addInput failed with error:"+ err);
    });

    // 向會話中添加預覽輸入流
    await captureSession.addOutput(previewOutput).then(() => {
      console.log('captureSession addOutput previewOutput instance is added.');
    }).catch(function(err){
      console.log("captureSession addOutput previewOutput failed with error:"+ err);
    });

    // 提交會話配置
    await captureSession.commitConfig().then(() => {
      console.log('captureSession commitConfig success.');
    }).catch(function(err){
      console.log("captureSession commitConfig failed with error:"+ err);
    });
    // 啟動會話
    await captureSession.start().then(() => {
      console.log('captureSession start success.');
    }).catch(function(err){
      console.log("captureSession start failed with error:"+ err);
    });
  }

  build() {
    Flex() {
      XComponent({                                                                     // 創(chuàng)建XComponent
        id: '',
        type: 'surface',
        libraryname: '',
        controller: this.mXComponentController
      })
        .onLoad(() => {                                                                  // 設置onload回調
          // 設置Surface寬高（1920*1080），預覽尺寸設置參考前面 previewProfilesArray 獲取的當前設備所支持的預覽分辨率大小去設置
          this.mXComponentController.setXComponentSurfaceSize({surfaceWidth:previewWidth,surfaceHeight:previewHeight})
          // 獲取Surface ID
          this.surfaceId = this.mXComponentController.getXComponentSurfaceId()
          this.initCamera(this.surfaceId)
        })
        .width('100%')                                                                 // 設置XComponent寬度
        .height('100%')                                                                // 設置XComponent高度
    }
  }

}