fix: technical debts left by the Sites, Authors and SEO slices, plus backend support for the new Sites and Authors pagination

internal/infrastructure/persistence/repositories/siteRepository.go

@@ -4,6 +4,7 @@ import (
 	domain "RenewCMS/internal/domain/site"
 	"RenewCMS/internal/infrastructure/persistence/mappers"
 	entity "RenewCMS/internal/infrastructure/persistence/models"
+	"strings"
 
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
@@ -59,6 +60,40 @@ func (s *SiteRepository) List() ([]domain.Site, error) {
 	return sites, nil
 }
 
+func (s *SiteRepository) Find(query domain.ListQuery) (domain.Page, error) {
+	all, err := s.List()
+	if err != nil {
+		return domain.Page{}, err
+	}
+	matching := all
+	if needle := foldForSearch(strings.TrimSpace(query.Q)); needle != "" {
+		matching = make([]domain.Site, 0, len(all))
+		for _, candidate := range all {
+			if siteMatches(candidate, needle) {
+				matching = append(matching, candidate)
+			}
+		}
+	}
+	page := domain.Page{Items: []domain.Site{}, Total: len(matching)}
+	if query.Size <= 0 {
+		page.Items = matching
+		return page, nil
+	}
+	start := pageStart(max(query.Page, 1), query.Size, len(matching))
+	end := min(start+query.Size, len(matching))
+	page.Items = matching[start:end]
+	return page, nil
+}
+
+func siteMatches(candidate domain.Site, needle string) bool {
+	for _, field := range []string{candidate.Name, candidate.Key, candidate.BaseURL} {
+		if strings.Contains(foldForSearch(field), needle) {
+			return true
+		}
+	}
+	return false
+}
+
 func (s *SiteRepository) load(db *gorm.DB, model entity.Site) (domain.Site, error) {
 	total, err := s.articleCount(db, model.ID)
 	if err != nil {