export const QUALIFICATION_MAX_FILE_SIZE = 5 * 1024 * 1024

const allowedExtensions = new Set(['jpg', 'jpeg', 'png'])
const allowedMimeTypes = new Set(['image/jpeg', 'image/png'])

export interface QualificationFileLike {
  name: string
  size: number
  type?: string
}

export function validateQualificationFile(file: QualificationFileLike) {
  const extension = file.name.includes('.') ? file.name.split('.').pop()?.toLowerCase() ?? '' : ''
  if (!allowedExtensions.has(extension)) return '文件格式不支持，请选择 JPG 或 PNG 图片'
  if (file.type && !allowedMimeTypes.has(file.type)) return '文件内容类型与支持的资质格式不一致'
  if (file.size <= 0) return '文件内容为空，请重新选择'
  if (file.size > QUALIFICATION_MAX_FILE_SIZE) return '文件超过 5MB，请压缩后重新选择'
  return ''
}

export function formatQualificationFileSize(bytes: number) {
  if (bytes < 1024) return `${bytes} B`
  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`
  return `${(bytes / 1024 / 1024).toFixed(1)} MB`
}