package request

import (
	"path/filepath"
	"strings"
)

type UploadFileRequest struct {
	Folder string `json:"folder" validate:"omitempty,oneof=cover avatar article common"`
}

// AllowedUploadExts 上传文件扩展名白名单（扩展名 → 期望的真实 MIME）。
var AllowedUploadExts = map[string]string{
	// 图片
	".jpg":  "image/jpeg",
	".jpeg": "image/jpeg",
	".png":  "image/png",
	".gif":  "image/gif",
	".webp": "image/webp",
	// 视频
	".mp4":  "video/mp4",
	".webm": "video/webm",
}

// IsAllowedUploadExt 扩展名是否在白名单内（大小写不敏感）
func IsAllowedUploadExt(ext string) bool {
	_, ok := AllowedUploadExts[strings.ToLower(ext)]
	return ok
}

// MatchUploadMime 校验实际 MIME 与扩展名匹配
func MatchUploadMime(filename, detectedMime string) bool {
	expected, ok := AllowedUploadExts[strings.ToLower(filepath.Ext(filename))]
	return ok && detectedMime == expected
}