Method SearchHistory

pkg/session/search.go:55–141

SearchHistory 搜索历史消息

(ctx context.Context, opts SearchOptions)

// SearchHistory 搜索历史消息
func (s *Searcher) SearchHistory(ctx context.Context, opts SearchOptions) ([]SearchResult, error) {
	if opts.Query == "" {
		return nil, errors.New("search query cannot be empty")
	}

	if opts.Limit <= 0 {
		opts.Limit = 20
	}

	if opts.MatchMode == "" {
		opts.MatchMode = "contains"
	}

	// 加载消息
	messages, err := s.store.LoadMessages(ctx, opts.AgentID)
	if err != nil {
		return nil, fmt.Errorf("load messages: %w", err)
	}

	// 执行搜索
	results := []SearchResult{}
	queryLower := strings.ToLower(opts.Query)

	for i, msg := range messages {
		// 角色过滤
		if opts.OnlyUser && msg.Role != types.MessageRoleUser {
			continue
		}
		if opts.OnlyAssistant && msg.Role != types.MessageRoleAssistant {
			continue
		}

		// 提取文本内容
		content := extractTextContent(msg)
		contentLower := strings.ToLower(content)

		// 匹配检查
		matched := false
		relevance := 0.0

		switch opts.MatchMode {
		case "exact":
			matched = strings.Contains(content, opts.Query)
			if matched {
				relevance = 1.0
			}
		case "contains":
			matched = strings.Contains(contentLower, queryLower)
			if matched {
				relevance = calculateRelevance(contentLower, queryLower)
			}
		case "fuzzy":
			relevance = fuzzyMatch(contentLower, queryLower)
			matched = relevance > 0.3
		}

		if matched {
			snippet := generateSnippet(content, opts.Query, 150)