feat: public API, SEO and existing surfaces

internal/infrastructure/useCases/publicVersions.go

@@ -0,0 +1,63 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/article"
+	"RenewCMS/internal/domain/localization"
+	"RenewCMS/internal/domain/site"
+	"slices"
+)
+
+func confirmedDefault(rows []localization.Row) string {
+	if localization.NeedsSetup(rows) {
+		return ""
+	}
+	return localization.DefaultTag(rows)
+}
+
+func eligibleSiblings(rows []localization.Row, versions []article.Article, served article.Article) []article.Article {
+	defaultTag := confirmedDefault(rows)
+	siblings := []article.Article{}
+	for _, version := range versions {
+		if version.ID == served.ID || version.SiteID != served.SiteID || !version.IsOnline || version.Lang == "" {
+			continue
+		}
+		if localization.EnabledTag(rows, version.Lang) {
+			siblings = append(siblings, version)
+		}
+	}
+	slices.SortFunc(siblings, func(left article.Article, right article.Article) int {
+		return localization.CompareTags(defaultTag, left.Lang, right.Lang)
+	})
+	return siblings
+}
+
+func storyVersions(repository article.Repository, art article.Article) ([]article.Article, error) {
+	if art.StoryID == 0 {
+		return []article.Article{}, nil
+	}
+	return repository.ListByStory(art.StoryID)
+}
+
+func alternatesOf(owner site.Site, siblings []article.Article) []article.Alternate {
+	alternates := make([]article.Alternate, 0, len(siblings))
+	for _, sibling := range siblings {
+		alternates = append(alternates, article.Alternate{ID: sibling.ID, Lang: sibling.Lang, StoryID: sibling.StoryID, Slug: sibling.Slug, URL: owner.PublicURL(sibling.Lang, sibling.Slug)})
+	}
+	return alternates
+}
+
+func rowOf(rows []localization.Row, tag string) localization.Row {
+	for _, row := range rows {
+		if row.Tag == tag {
+			return row
+		}
+	}
+	return localization.Row{Tag: tag}
+}
+
+func socialLocaleOf(rows []localization.Row, tag string, siteLocale *string) string {
+	if resolved := localization.EffectiveSocialLocale(rowOf(rows, tag), siteLocale); resolved != nil {
+		return *resolved
+	}
+	return ""
+}