/**
 * 判断文件是否支持预览
 */
export function isPreviewable(mime: string | null | undefined): boolean {
  if (!mime || mime === undefined) return false;
  return (
    mime.startsWith('image/') ||
    mime.startsWith('video/') ||
    mime === 'application/pdf' ||
    mime.startsWith('text/')
  );
}

/**
 * 从 Directus 获取文件元信息
 */
export async function getFileMeta(id: string): Promise<FileMeta | null> {
  const runtimeConfig = useRuntimeConfig();
  const baseUrl = runtimeConfig.public.directus.url;
  const access_token = runtimeConfig.public.directus.token;

  try {
    const response = await $fetch<{ data: DirectusFile }>(
      `${baseUrl}/files/${id}`,
      {
        headers: {
          Authorization: access_token ? `Bearer ${access_token}` : '',
        },
      }
    );

    const file = response.data;
    if (!file) return null;

    return {
      id: file.id,
      title: file.filename_disk ?? '',
      filename_download: file.filename_download ?? '',
      type: file.type ?? '',
      filesize: Number(file.filesize),
      width: file.width ?? undefined,
      height: file.height ?? undefined,
      uploaded_on: file.uploaded_on ?? undefined,
      url: `/api/assets/${file.id}`,
      previewable: isPreviewable(file.type),
    };
  } catch (error) {
    if (error instanceof Error) {
      logger.error('Error fetching file metadata:', error.message);
    }
    return null;
  }
}