package globals

import (
	"errors"
	"fmt"
	"log/slog"
	"strings"

	"github.com/go-playground/locales/zh"
	ut "github.com/go-playground/universal-translator"
	"github.com/go-playground/validator/v10"
	zhtrans "github.com/go-playground/validator/v10/translations/zh"
	"github.com/gofiber/fiber/v2"
)

var Validator *ValidatorClient

type ValidatorClient struct {
	validator  *validator.Validate
	translator ut.Translator
}

func (v *ValidatorClient) ParseBody(c *fiber.Ctx, data any) error {
	if err := c.BodyParser(data); err != nil {
		return err
	}
	return validate(data)
}

func (v *ValidatorClient) ParseQuery(c *fiber.Ctx, data any) error {
	if err := c.QueryParser(data); err != nil {
		return err
	}
	return validate(data)
}

func validate(data any) error {
	if errs := Validator.validator.Struct(data); errs != nil {
		var sb = strings.Builder{}
		var typeErrs validator.ValidationErrors
		errors.As(errs, &typeErrs)
		for i, err := range typeErrs {
			sb.WriteString(err.Translate(Validator.translator))
			if i < len(typeErrs)-1 {
				sb.WriteString("\n")
			}
		}
		slog.Debug("请求参数验证失败", "msg", sb.String())
		return fiber.NewError(fiber.StatusBadRequest, sb.String())
	}
	return nil
}

func initValidator() error {
	var validate = validator.New(validator.WithRequiredStructEnabled())

	var translator = ut.New(zh.New()).GetFallback()
	err := zhtrans.RegisterDefaultTranslations(validate, translator)
	if err != nil {
		return fmt.Errorf("初始化验证器失败: %w", err)
	}

	Validator = &ValidatorClient{
		validator:  validate,
		translator: translator,
	}
	return nil
}