export const DEFAULT_MAX_IMAGE_BYTES = 2 * 1024 * 1024

export function readFileAsDataUrl(
  file: File,
  maxBytes = DEFAULT_MAX_IMAGE_BYTES,
  tooLargeMessage = 'Image is too large',
): Promise<string> {
  if (file.size > maxBytes) {
    return Promise.reject(new Error(tooLargeMessage))
  }
  return new Promise((resolve, reject) => {
    const reader = new FileReader()
    reader.onload = () => resolve(String(reader.result || ''))
    reader.onerror = () => reject(reader.error || new Error('read failed'))
    reader.readAsDataURL(file)
  })
}

export function urlToUploadFileList(url?: string | null, prefix = 'img') {
  if (!url || String(url).trim() === '') return []
  const value = String(url)
  return [
    {
      uid: `${prefix}-${value.slice(0, 24)}`,
      name: 'image',
      url: value,
      status: 'done',
    },
  ]
}