export const ALLOWED_IMAGE_TYPES = ['image/jpeg', 'image/jpg', 'image/png', 'image/bmp']

/** 读取多个文件为 data URL，返回解析完的数组。 */
export function readFilesAsDataUrls(files: Blob[] | FileList): Promise<string[]> {
  const list = Array.from(files)
  return Promise.all(
    list.map(
      (file) =>
        new Promise<string>((resolve, reject) => {
          const reader = new FileReader()
          reader.onload = () => resolve(String(reader.result || ''))
          reader.onerror = () => reject(reader.error || new Error('读取文件失败'))
          reader.readAsDataURL(file)
        }),
    ),
  )
}

/** 从剪贴板读取图片文件。 */
export async function pasteClipboardImages(): Promise<Blob[]> {
  try {
    const items = await navigator.clipboard.read()
    const images: Blob[] = []
    for (const item of items) {
      if (item.types.includes('image/png')) {
        images.push(await item.getType('image/png'))
      } else if (item.types.includes('image/jpeg')) {
        images.push(await item.getType('image/jpeg'))
      }
    }
    return images
  } catch (err) {
    console.warn('粘贴图片失败:', err)
    return []
  }
}