Method AddPreference

pkg/memory/preference.go:105–140

AddPreference 添加偏好

(ctx context.Context, pref *Preference)

// AddPreference 添加偏好
func (pm *PreferenceManager) AddPreference(ctx context.Context, pref *Preference) error {
	pm.mu.Lock()
	defer pm.mu.Unlock()

	// 检查是否已存在相同的偏好
	existing := pm.findExistingPreference(pref.UserID, pref.Category, pref.Key)

	if existing != nil {
		// 处理冲突
		return pm.handleConflict(existing, pref)
	}

	// 检查偏好数量限制
	if len(pm.preferences[pref.UserID]) >= pm.config.MaxPreferencesPerUser {
		return fmt.Errorf("max preferences limit reached for user %s", pref.UserID)
	}

	// 生成 ID
	if pref.ID == "" {
		pref.ID = fmt.Sprintf("pref-%s-%d", pref.UserID, time.Now().UnixNano())
	}

	// 设置时间戳
	now := time.Now()
	pref.CreatedAt = now
	pref.UpdatedAt = now

	// 添加到存储
	pm.preferences[pref.UserID] = append(pm.preferences[pref.UserID], pref)

	// 更新索引
	indexKey := fmt.Sprintf("%s:%s", pref.UserID, pref.Category)
	pm.categoryIndex[indexKey] = append(pm.categoryIndex[indexKey], pref)

	return nil
}

// findExistingPreference 查找已存在的偏好
func (pm *PreferenceManager) findExistingPreference(