first commit

internal/services/post_category_view_service.go

@@ -0,0 +1,65 @@
+package services
+
+import (
+	"errors"
+	"time"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type PostCategoryViewService struct{}
+
+func NewPostCategoryViewService() *PostCategoryViewService {
+	return &PostCategoryViewService{}
+}
+
+// TrackView records a category view once per day per IP.
+func (s *PostCategoryViewService) TrackView(categoryID string, ipAddress string, userAgent string) (*models.PostCategoryView, error) {
+	categoryUUID, err := uuid.Parse(categoryID)
+	if err != nil {
+		return nil, errors.New("invalid category_id")
+	}
+
+	startOfDay := time.Now().UTC().Truncate(24 * time.Hour)
+	endOfDay := startOfDay.Add(24 * time.Hour)
+
+	var existing models.PostCategoryView
+	err = database.DB.Where(
+		"category_id = ? AND ip_address = ? AND created_at >= ? AND created_at < ?",
+		categoryUUID,
+		ipAddress,
+		startOfDay,
+		endOfDay,
+	).First(&existing).Error
+	if err == nil {
+		return &existing, nil
+	}
+	if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, err
+	}
+
+	view := models.PostCategoryView{
+		CategoryID: categoryUUID,
+		IPAddress:  ipAddress,
+		UserAgent:  userAgent,
+	}
+
+	if err := database.DB.Create(&view).Error; err != nil {
+		return nil, err
+	}
+
+	return &view, nil
+}
+
+// GetViewsByCategory returns all views for a category.
+func (s *PostCategoryViewService) GetViewsByCategory(categoryID string) ([]models.PostCategoryView, error) {
+	var views []models.PostCategoryView
+	if err := database.DB.Where("category_id = ?", categoryID).Order("created_at desc").Find(&views).Error; err != nil {
+		return nil, err
+	}
+	return views, nil
+}