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/** 后台封面、轮播图、预约二维码图等：单张图片大小上限（与 UI 文案一致） */
export const ADMIN_UPLOAD_IMAGE_MAX_BYTES = 1024 * 1024
/** 与上传校验配套，跟在「尺寸推荐」后 */
export const ADMIN_IMAGE_RECOMMEND_LABEL =
'图片尺寸推荐 1200× ，
/** @returns 可提示用户的中文错误文案；未超限或非图片返回 null */
export function adminUploadImageTooLargeMessage ( file : File ) : string | null {
if ( ! file . type . startsWith ( 'image/' ) ) return null
if ( file . size <= ADMIN_UPLOAD_IMAGE_MAX_BYTES ) return null
const mb = file . size / ( 1024 * 1024 )
const cur =
mb >= 1 ? ` ${ mb . toFixed ( 2 ) } MB ` : ` ${ Math . ceil ( file . size / 1024 ) } KB `
return ` 单张图片不能超过 1MB（ ${ cur } ） `
}
