package binding

import (
	"encoding/json"
	"fmt"
	"strings"

	"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 := 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(err error) string {
	if errors, ok := err.(validator.ValidationErrors); ok {
		errs := make(map[string]any)
		for _, e := range errors {
			errs[e.StructField()] = strings.Replace(e.Translate(trans), e.StructField(), "", -1)
		}

		// 将 map 转换为 JSON 格式的字节切片
		jsonData, err := json.MarshalIndent(errs, "", "  ")
		if err != nil {
			return err.Error()
		}
		return string(jsonData)
	} else {
		return err.Error()
	}
}