import { photoAccessHelper } from '@kit.MediaLibraryKit';
import { image } from '@kit.ImageKit';
import { fileIo as fs } from '@kit.CoreFileKit';

@Entry
@Component
struct Index {
  @State getAlbum: string = '显示相册中的图片';
  @State pixelsArray : Array<image.PixelMap> | undefined = undefined;
  @State albumPath: Array<string> = [];
  @State photoSize: number = 0;

  async getPictureFromAlbum() {
    // 拉起相册，选择图片
    let PhotoSelectOptions = new photoAccessHelper.PhotoSelectOptions();
    PhotoSelectOptions.MIMEType = photoAccessHelper.PhotoViewMIMETypes.IMAGE_TYPE;
    PhotoSelectOptions.maxSelectNumber = 3;
    let photoPicker = new photoAccessHelper.PhotoViewPicker();
    let photoSelectResult: photoAccessHelper.PhotoSelectResult = await photoPicker.select(PhotoSelectOptions);
    photoSelectResult.photoUris.forEach(item => {
      this.albumPath.push(item);
    });

    // 读取图片为 buffer
    const promises = this.albumPath.map(async (path) => {
      const file = fs.openSync(path, fs.OpenMode.READ_ONLY);
      this.photoSize = fs.statSync(file.fd).size;
      console.info('Photo Size: ' + this.photoSize);
      let buffer = new ArrayBuffer(this.photoSize);
      fs.readSync(file.fd, buffer);
      fs.closeSync(file);

      // 解码成 PixelMap
      const imageSource = image.createImageSource(buffer);
      return await imageSource.createPixelMap({});
    });

    this.pixelsArray  = await Promise.all(promises);
  }


  build() {
    Row() {
      Column() {
        Button('显示照片')
          .onClick(() => {
            this.getPictureFromAlbum();
          })
        Grid(){
          ForEach(this.pixelsArray,(item:image.PixelMap,index:number)=>{
            GridItem(){
              Image(item)
                .width('100%')
                .aspectRatio(1)
            }
          })
        }
        .width('100%')
        .columnsTemplate('1fr 1fr 1fr')
      }
      .width('100%')
    }
    .height('100%')
  }
}

PhotoSelectOptions.maxSelectNumber = 3; 要上传的图片数量