refactor: split modules and harden scraping workflows

internal/repository/favorite_repository.go

@@ -0,0 +1,34 @@
+package repository
+
+import (
+	"context"
+	"errors"
+
+	"gorm.io/gorm"
+
+	"github.com/ShukeBta/MediaStationGo/internal/model"
+)
+
+// FavoriteRepository persists model.Favorite records.
+type FavoriteRepository struct{ db *gorm.DB }
+
+// Toggle flips the favourite flag for (user, media). Returns the new state.
+func (r *FavoriteRepository) Toggle(ctx context.Context, userID, mediaID string) (bool, error) {
+	var f model.Favorite
+	err := r.db.WithContext(ctx).Where("user_id = ? AND media_id = ?", userID, mediaID).First(&f).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		fav := model.Favorite{UserID: userID, MediaID: mediaID}
+		return true, r.db.WithContext(ctx).Create(&fav).Error
+	}
+	if err != nil {
+		return false, err
+	}
+	return false, r.db.WithContext(ctx).Delete(&f).Error
+}
+
+// ListByUser returns all favourite media IDs for a user.
+func (r *FavoriteRepository) ListByUser(ctx context.Context, userID string) ([]model.Favorite, error) {
+	var rows []model.Favorite
+	err := r.db.WithContext(ctx).Where("user_id = ?", userID).Find(&rows).Error
+	return rows, err
+}