package useCases

import (
	"RenewCMS/internal/domain/article"
	"errors"
)

const (
	firstSlugAttempt      = 1
	firstSuggestedAttempt = 2
	maxCreateSlugAttempts = 5
	maxFreeSlugAttempts   = 100
)

func freeSlug(articles article.Repository, siteID uint32, base string, exceptID uint32, firstAttempt int) (string, error) {
	for attempt := firstAttempt; attempt <= maxFreeSlugAttempts; attempt++ {
		candidate := article.SlugWithSuffix(base, attempt)
		taken, err := articles.SlugTaken(siteID, candidate, exceptID)
		if err != nil {
			return "", err
		}
		if !taken {
			return candidate, nil
		}
	}
	return "", article.ErrSlugTaken
}

func slugConflict(articles article.Repository, siteID uint32, slug string, exceptID uint32) error {
	suggestion, err := freeSlug(articles, siteID, slug, exceptID, firstSuggestedAttempt)
	if err != nil {
		return err
	}
	return &article.SlugTakenError{Suggestion: suggestion}
}

func isSlugTakenError(err error) bool {
	return errors.Is(err, article.ErrSlugTaken)
}