/**
 * 封装对象存储的操作类
 */
@Component
public class CosManager {  
  
    @Resource
    private CosClientConfig cosClientConfig;

    //操作对象存储的客户端对象
    @Resource  
    private COSClient cosClient;


    /**
     * 上传对象
     *
     * @param key  对象在存储桶中的唯一标识
     * @param file 本地文件
     */
    public PutObjectResult putObject(String key, File file) {
        //创建一个PutObjectRequest上传对象请求对象，来指定要向哪个存储桶中上传哪个文件，同时需要指定对象在存储桶中的唯一标识
        PutObjectRequest putObjectRequest = new PutObjectRequest(cosClientConfig.getBucket(), key,
                file);
        //最后调用COSClient的putObject方法，将PutObjectRequest对象传入，上传文件
        return cosClient.putObject(putObjectRequest);
    }

    /**
     * 下载对象
     *
     * @param key 唯一键
     */
    public COSObject getObject(String key) {
        //创建一个GetObjectRequest下载对象请求对象，来指定从哪个存储桶中下载哪个文件
        GetObjectRequest getObjectRequest = new GetObjectRequest(cosClientConfig.getBucket(), key);
        //最后调用COSClient的getObject方法，将GetObjectRequest对象传入，下载文件
        return cosClient.getObject(getObjectRequest);
    }


    /**
     * 上传图片的同时解析图片（附带图片信息）
     *
     * @param key  唯一键
     * @param file 文件
     */
    public PutObjectResult putPictureObject(String key, File file) {
        PutObjectRequest putObjectRequest = new PutObjectRequest(cosClientConfig.getBucket(), key,
                file);
        // 对图片进行处理（获取基本信息也被视作为一种处理）
        PicOperations picOperations = new PicOperations();
        // 1 表示返回原图信息
        picOperations.setIsPicInfo(1);
        // 构造处理参数
        putObjectRequest.setPicOperations(picOperations);
        return cosClient.putObject(putObjectRequest);
    }


}

/**
 * 上传图片的工具类
 */
@Slf4j
@Service
public class FileManager {
  
    @Resource
    private CosClientConfig cosClientConfig;
  
    @Resource  
    private CosManager cosManager;

    /**
     * 上传图片
     *
     * @param multipartFile    上传的文件
     * @param uploadPathPrefix 上传路径的前缀
     * @return
     */
    public UploadPictureResult uploadPicture(MultipartFile multipartFile, String uploadPathPrefix) {
        // 校验图片
        validPicture(multipartFile);
        // 处理图片的上传地址
        String uuid = RandomUtil.randomString(16);
        String originFilename = multipartFile.getOriginalFilename();
        //自己处理上传文件的文件名，而不是使用原始的文件名，增加安全性
        String uploadFilename = String.format("%s_%s.%s", DateUtil.formatDate(new Date()), uuid,
                FileUtil.getSuffix(originFilename));
        //文件上传到存储桶中的路径（前缀/文件名.后缀）
        String uploadPath = String.format("/%s/%s", uploadPathPrefix, uploadFilename);
        //解析结果并返回
        File file = null;
        try {
            // 创建临时文件
            file = File.createTempFile(uploadPath, null);
            multipartFile.transferTo(file);
            // 上传图片
            PutObjectResult putObjectResult = cosManager.putPictureObject(uploadPath, file);
            //获取图片上传信息对象
            ImageInfo imageInfo = putObjectResult.getCiUploadResult().getOriginalInfo().getImageInfo();
            //计算图片的宽高
            int picWidth = imageInfo.getWidth();
            int picHeight = imageInfo.getHeight();
            double picScale = NumberUtil.round(picWidth * 1.0 / picHeight, 2).doubleValue();
            // 封装返回结果
            UploadPictureResult uploadPictureResult = new UploadPictureResult();
            uploadPictureResult.setPicName(FileUtil.mainName(originFilename));
            uploadPictureResult.setPicWidth(picWidth);
            uploadPictureResult.setPicHeight(picHeight);
            uploadPictureResult.setPicScale(picScale);
            uploadPictureResult.setPicFormat(imageInfo.getFormat());
            uploadPictureResult.setPicSize(FileUtil.size(file));
            uploadPictureResult.setUrl(cosClientConfig.getHost() + "/" + uploadPath);
            return uploadPictureResult;
        } catch (Exception e) {
            log.error("图片上传到对象存储失败", e);
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "上传失败");
        } finally {
            this.deleteTempFile(file);
        }
    }

    /**
     * 校验文件
     *
     * @param multipartFile multipart 文件
     */
    public void validPicture(MultipartFile multipartFile) {
        ThrowUtils.throwIf(multipartFile == null, ErrorCode.PARAMS_ERROR, "文件不能为空");
        // 1. 校验文件的大小
        long fileSize = multipartFile.getSize();
        final long ONE_M = 1024 * 1024L;
        ThrowUtils.throwIf(fileSize > 2 * ONE_M, ErrorCode.PARAMS_ERROR, "文件大小不能超过 2M");
        // 2. 校验上传文件的后缀
        String fileSuffix = FileUtil.getSuffix(multipartFile.getOriginalFilename());
        // 定义允许上传的文件后缀
        final List<String> ALLOW_FORMAT_LIST = Arrays.asList("jpeg", "jpg", "png", "webp");
        ThrowUtils.throwIf(!ALLOW_FORMAT_LIST.contains(fileSuffix), ErrorCode.PARAMS_ERROR, "文件类型错误");
    }

    /**
     * 删除临时文件
     */
    public void deleteTempFile(File file) {
        if (file == null) {
            return;
        }
        // 删除临时文件
        boolean deleteResult = file.delete();
        if (!deleteResult) {
            log.error("file delete error, filepath = {}", file.getAbsolutePath());
        }
    }



}