package utils

import (
	"fmt"
	"github.com/go-playground/validator/v10"
	"reflect"
)

func formatValidationError(err error) string {
	if _, ok := err.(*validator.InvalidValidationError); ok {
		return err.Error()
	}

	var errorMessage string
	for _, err := range err.(validator.ValidationErrors) {
		switch err.Tag() {
		case "required":
			errorMessage += fmt.Sprintf("The field '%s' is required.", err.Field())
		case "min":
			if err.Kind() == reflect.Slice {
				errorMessage += fmt.Sprintf("The field '%s' must contain at least %s items.", err.Field(), err.Param())
			} else {
				errorMessage += fmt.Sprintf("The field '%s' must be at least %s.", err.Field(), err.Param())
			}
		case "oneof":
			errorMessage += fmt.Sprintf("The field '%s' must be one of [%s].", err.Field(), err.Param())
		case "email":
			errorMessage += fmt.Sprintf("The field '%s' must be a valid email address.", err.Field())
		case "len":
			errorMessage += fmt.Sprintf("The field '%s' must be exactly %s characters long.", err.Field(), err.Param())
		default:
			errorMessage += fmt.Sprintf("The field '%s' is invalid.", err.Field())
		}
		errorMessage += " "
	}

	return errorMessage
}