package myvalidator

import (
	"errors"
	"fmt"
	"net/http"

	"git.artlef.fr/PersonalLibraryManager/internal/appcontext"
	"git.artlef.fr/PersonalLibraryManager/internal/i18nresource"
	"github.com/gin-gonic/gin"
	"github.com/go-playground/validator/v10"
)

type apiValidationError struct {
	Field string `json:"field"`
	Err   string `json:"error"`
}

func ManageBindingError(ac appcontext.AppContext, err error) {
	var ve validator.ValidationErrors
	if errors.As(err, &ve) {
		ac.C.JSON(http.StatusBadRequest, getValidationErrors(ac, &ve))
	} else {
		ac.C.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
	}
}

func getValidationErrors(ac appcontext.AppContext, ve *validator.ValidationErrors) []apiValidationError {
	errors := make([]apiValidationError, len(*ve))
	for i, fe := range *ve {
		errors[i] = apiValidationError{
			Field: fe.Field(),
			Err:   computeValidationMessage(ac, &fe),
		}
	}
	return errors
}

func computeValidationMessage(ac appcontext.AppContext, fe *validator.FieldError) string {
	tag := (*fe).Tag()
	switch tag {
	case "required":
		return i18nresource.GetTranslatedMessage(ac, "ValidationRequired")
	case "min":
		return fmt.Sprintf(i18nresource.GetTranslatedMessage(ac, "ValidationTooShort"), (*fe).Param())
	case "max":
		return fmt.Sprintf(i18nresource.GetTranslatedMessage(ac, "ValidationTooLong"), (*fe).Param())
	default:
		return fmt.Sprintf(i18nresource.GetTranslatedMessage(ac, "ValidationPropertyFail"), tag)
	}
}