package controller

import (
	"strings"

	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/net/ghttp"
)

// ajaxMsg 返回JSON消息（兼容新旧两种格式）
func ajaxMsg(r *ghttp.Request, msg interface{}, msgno int) {
	r.Response.WriteJson(g.Map{
		"status":  msgno,
		"code":    msgno,
		"message": msg,
	})
}

// ajaxList 返回JSON列表（LayUI table 格式）
func ajaxList(r *ghttp.Request, msg interface{}, msgno int, count int, data interface{}) {
	r.Response.WriteJson(g.Map{
		"code":  msgno,
		"msg":   msg,
		"count": count,
		"data":  data,
	})
}

// parseSort 解析并验证排序参数（防 SQL 注入），field/order 均通过返回 field+" "+order，否则返回 ""
func parseSort(r *ghttp.Request) string {
	field := strings.TrimSpace(r.Get("field", "").String())
	order := strings.TrimSpace(r.Get("order", "").String())
	if field == "" || order == "" {
		return ""
	}
	// 字段名校验：只允许字母、数字、下划线
	for _, c := range field {
		if !((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_') {
			return ""
		}
	}
	// 标准化排序方向
	switch order {
	case "asc", "ascending":
		return field + " asc"
	case "desc", "descending":
		return field + " desc"
	}
	return ""
}