feat(expiry): 完成 #25 用户设置接口实现

internal/expiry/repository.go

@@ -217,3 +217,52 @@ func (r *Repository) UpdateStatus(id, userID uint, status string) error {
 	}
 	return nil
 }
+
+// GetSettings 查询用户提醒设置。
+func (r *Repository) GetSettings(userID uint) (*ExpiryUserSettings, error) {
+	var settings ExpiryUserSettings
+	err := r.db.Where("user_id = ?", userID).First(&settings).Error
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("find expiry settings: %w", err)
+	}
+	return &settings, nil
+}
+
+// UpdateSettings 更新用户提醒设置（不存在则创建）。
+func (r *Repository) UpdateSettings(userID uint, remindDays []int) (*ExpiryUserSettings, error) {
+	settings, err := r.GetSettings(userID)
+	if err != nil {
+		return nil, err
+	}
+
+	if settings == nil {
+		settings = &ExpiryUserSettings{
+			UserID:     userID,
+			RemindDays: copyIntSlice(remindDays),
+		}
+		if err := r.db.Create(settings).Error; err != nil {
+			return nil, fmt.Errorf("create expiry settings: %w", err)
+		}
+		return settings, nil
+	}
+
+	settings.RemindDays = copyIntSlice(remindDays)
+	if err := r.db.Model(&ExpiryUserSettings{}).
+		Where("user_id = ?", userID).
+		Update("remind_days", settings.RemindDays).Error; err != nil {
+		return nil, fmt.Errorf("update expiry settings: %w", err)
+	}
+	return settings, nil
+}
+
+func copyIntSlice(values []int) []int {
+	if len(values) == 0 {
+		return nil
+	}
+	copied := make([]int, len(values))
+	copy(copied, values)
+	return copied
+}