package services

import (
	"strings"

	"server/models"

	beego "github.com/beego/beego/v2/server/web"
)

// PublicRequestBaseURL 根据请求拼出对外访问的根（用于把 /uploads/... 拼成完整下载地址）
func PublicRequestBaseURL(c *beego.Controller) (scheme, host string) {
	scheme = "http"
	if c.Ctx.Request.TLS != nil {
		scheme = "https"
	}
	if strings.EqualFold(strings.TrimSpace(c.Ctx.Request.Header.Get("X-Forwarded-Proto")), "https") {
		scheme = "https"
	}
	host = strings.TrimSpace(c.Ctx.Request.Host)
	return scheme, host
}

// ResolveSoftwareDownloadURL 优先使用自定义 download_url；否则根据 file_id 读附件 src 拼完整 URL
func ResolveSoftwareDownloadURL(scheme, host string, downloadURL *string, fileID *uint64) string {
	if downloadURL != nil {
		u := strings.TrimSpace(*downloadURL)
		if u != "" {
			return u
		}
	}
	if fileID == nil || *fileID == 0 {
		return ""
	}
	var f models.SystemFile
	err := models.Orm.QueryTable(new(models.SystemFile)).
		Filter("id", *fileID).
		Filter("delete_time__isnull", true).
		One(&f)
	if err != nil {
		return ""
	}
	src := strings.TrimSpace(f.Src)
	if src == "" {
		return ""
	}
	if strings.HasPrefix(strings.ToLower(src), "http://") || strings.HasPrefix(strings.ToLower(src), "https://") {
		return src
	}
	if host == "" {
		return src
	}
	if !strings.HasPrefix(src, "/") {
		src = "/" + src
	}
	if scheme == "" {
		scheme = "http"
	}
	return scheme + "://" + host + src
}