package base

import (
	"github.com/gin-gonic/gin/binding"
	"github.com/go-playground/locales/zh"
	ut "github.com/go-playground/universal-translator"
	"github.com/go-playground/validator/v10"
	zh_translations "github.com/go-playground/validator/v10/translations/zh"
	"log"
	"reflect"
	"strings"
)

var translator ut.Translator

type ErrMsg = map[string]string

// 自定义验证器的错误消息映射表
var customMsg = map[string]string{
	//"exists": "{0}对应的记录不存在",
}

// initValidateMsg 初始验证器消息处理器（中间件)
func initValidateMsg() {
	uni := ut.New(zh.New())
	translator, _ = uni.GetTranslator("zh")
	v := binding.Validator.Engine().(*validator.Validate)
	_ = zh_translations.RegisterDefaultTranslations(v, translator)
	// 注册自定验证器的翻译
	tf := func(ut ut.Translator, fe validator.FieldError) string {
		msg, err := ut.T(fe.Tag(), fe.Field())
		if err != nil {
			log.Println(err)
		}
		return msg
	}
	for tag, text := range customMsg {
		_ = v.RegisterTranslation(tag, translator, func(trans ut.Translator) error {
			_ = trans.Add(tag, text, false)
			return nil
		}, tf)
	}

	v.RegisterTagNameFunc(func(fld reflect.StructField) string {
		name := ""
		tagJson := fld.Tag.Get("json")
		if len(tagJson) > 0 {
			tmpName := strings.SplitN(tagJson, ",", 2)[0]
			if tmpName != "-" {
				name = tmpName
			}
		}
		return name
	})
}

// Translate 翻译错误消息的方法
func Translate(err error) map[string]string {
	errs, ok := err.(validator.ValidationErrors)
	if !ok {
		return nil
	}
	errMsg := make(ErrMsg, len(errs))
	for _, e := range errs {
		errMsg[e.Field()] = e.Translate(translator)
	}
	return errMsg
}

func init() {
	//
	initValidateMsg()
}