package gu

import (
	"fmt"
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"
	"github.com/gin-gonic/gin/binding"
	"github.com/go-playground/locales/en"
	"github.com/go-playground/locales/zh"
	ut "github.com/go-playground/universal-translator"
	"github.com/go-playground/validator/v10"
	enTranslations "github.com/go-playground/validator/v10/translations/en"
	chTranslations "github.com/go-playground/validator/v10/translations/zh"
)

var trans ut.Translator

// loca 通常取决于 http 请求头的 'Accept-Language'
func SetValidatorTrans(local string) (err error) {
	if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
		zhT := zh.New() //chinese
		enT := en.New() //english
		uni := ut.New(enT, zhT, enT)

		var o bool
		trans, o = uni.GetTranslator(local)
		if !o {
			return fmt.Errorf("uni.GetTranslator(%s) failed", local)
		}
		//register translate
		// 注册翻译器
		switch local {
		case "en":
			err = enTranslations.RegisterDefaultTranslations(v, trans)
		case "zh":
			err = chTranslations.RegisterDefaultTranslations(v, trans)
		default:
			err = enTranslations.RegisterDefaultTranslations(v, trans)
		}
		return
	}
	return
}

func ValidatorErrors(ctx *gin.Context, err error) {
	if errors, ok := err.(validator.ValidationErrors); ok {
		errs := gin.H{}
		for _, e := range errors {
			errs[e.StructField()] = strings.Replace(e.Translate(trans), e.StructField(), "", -1)
		}
		ctx.JSON(http.StatusBadRequest, errs)
	} else {
		ctx.JSON(http.StatusBadRequest, err)
	}
}