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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） */
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export const ADMIN_UPLOAD_IMAGE_MAX_BYTES = 1024 * 1024
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/** 与上传校验配套，跟在「尺寸推荐」后 */
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export const ADMIN_IMAGE_RECOMMEND_LABEL =
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'图片尺寸推荐 1200×600，图片大小不超过 1MB'
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/** @returns 可提示用户的中文错误文案；未超限或非图片返回 null */
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export function adminUploadImageTooLargeMessage(file: File): string | null {
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if (!file.type.startsWith('image/')) return null
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if (file.size <= ADMIN_UPLOAD_IMAGE_MAX_BYTES) return null
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const mb = file.size / (1024 * 1024)
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const cur =
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mb >= 1 ? `${mb.toFixed(2)}MB` : `${Math.ceil(file.size / 1024)}KB`
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return `单张图片不能超过 1MB（当前约 ${cur}）`
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}
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