484 lines
13 KiB
JavaScript
484 lines
13 KiB
JavaScript
// 消息搜索管理器 - 微信小程序专用
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// 处理消息搜索、历史记录管理、本地缓存等
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const apiClient = require('./api-client.js');
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/**
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* 消息搜索管理器
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* 功能：
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* 1. 全局消息搜索
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* 2. 会话内搜索
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* 3. 搜索结果高亮
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* 4. 搜索历史管理
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* 5. 本地缓存优化
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* 6. 分页加载
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*/
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class MessageSearchManager {
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constructor() {
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this.isInitialized = false;
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// 搜索配置
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this.searchConfig = {
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// 最小搜索关键词长度
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minKeywordLength: 1,
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// 搜索结果每页数量
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pageSize: 20,
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// 最大搜索历史数量
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maxSearchHistory: 50,
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// 本地缓存过期时间（毫秒）
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cacheExpireTime: 30 * 60 * 1000, // 30分钟
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// 搜索防抖延迟（毫秒）
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debounceDelay: 300,
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// 支持的搜索类型
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searchTypes: ['text', 'image', 'file', 'all']
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};
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// 搜索缓存
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this.searchCache = new Map();
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// 搜索历史
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this.searchHistory = [];
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// 当前搜索状态
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this.currentSearch = {
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keyword: '',
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type: 'all',
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conversationId: null,
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page: 1,
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hasMore: true,
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loading: false,
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results: []
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};
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// 防抖定时器
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this.debounceTimer = null;
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this.init();
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}
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// 初始化搜索管理器
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async init() {
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if (this.isInitialized) return;
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console.log('🔍 初始化消息搜索管理器...');
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try {
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// 加载搜索历史
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await this.loadSearchHistory();
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// 清理过期缓存
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this.cleanupExpiredCache();
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this.isInitialized = true;
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console.log('✅ 消息搜索管理器初始化完成');
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} catch (error) {
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console.error('❌ 消息搜索管理器初始化失败:', error);
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}
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}
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// 全局搜索消息
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async searchMessages(keyword, options = {}) {
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try {
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// 验证搜索关键词
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if (!this.validateKeyword(keyword)) {
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return { success: false, error: '搜索关键词无效' };
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}
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console.log('🔍 搜索消息:', keyword);
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// 设置搜索参数
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const searchParams = {
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keyword: keyword.trim(),
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type: options.type || 'all',
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conversationId: options.conversationId || null,
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page: options.page || 1,
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pageSize: options.pageSize || this.searchConfig.pageSize
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};
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// 检查缓存
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const cacheKey = this.generateCacheKey(searchParams);
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const cachedResult = this.getFromCache(cacheKey);
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if (cachedResult) {
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console.log('🔍 使用缓存搜索结果');
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return cachedResult;
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}
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// 更新搜索状态
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this.updateSearchState(searchParams);
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// 执行搜索
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const result = await this.performSearch(searchParams);
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// 缓存结果
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if (result.success) {
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this.saveToCache(cacheKey, result);
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// 添加到搜索历史
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this.addToSearchHistory(keyword);
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}
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return result;
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} catch (error) {
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console.error('❌ 搜索消息失败:', error);
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return { success: false, error: error.message };
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}
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}
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// 会话内搜索
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async searchInConversation(conversationId, keyword, options = {}) {
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return await this.searchMessages(keyword, {
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...options,
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conversationId: conversationId
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});
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}
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// 防抖搜索
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searchWithDebounce(keyword, options = {}, callback) {
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// 清除之前的定时器
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if (this.debounceTimer) {
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clearTimeout(this.debounceTimer);
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}
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// 设置新的定时器
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this.debounceTimer = setTimeout(async () => {
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try {
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const result = await this.searchMessages(keyword, options);
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if (callback) {
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callback(result);
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}
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} catch (error) {
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console.error('❌ 防抖搜索失败:', error);
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if (callback) {
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callback({ success: false, error: error.message });
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}
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}
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}, this.searchConfig.debounceDelay);
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}
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// 执行搜索
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async performSearch(searchParams) {
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try {
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this.currentSearch.loading = true;
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// 构建搜索请求
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const requestData = {
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keyword: searchParams.keyword,
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messageType: searchParams.type === 'all' ? null : this.getMessageTypeCode(searchParams.type),
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page: searchParams.page,
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pageSize: searchParams.pageSize
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};
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// 如果指定了会话ID，则进行会话内搜索
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if (searchParams.conversationId) {
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requestData.conversationId = searchParams.conversationId;
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}
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// 调用搜索API（按统一客户端签名）
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const response = await apiClient.post('/api/v1/messages/search', requestData);
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if (response && (response.code === 0 || response.code === 200 || response.success)) {
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const searchResult = {
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success: true,
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data: {
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messages: response.data?.messages || [],
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total: response.data?.total || 0,
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page: searchParams.page,
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pageSize: searchParams.pageSize,
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hasMore: response.data?.hasMore || false,
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keyword: searchParams.keyword,
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searchTime: Date.now()
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}
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};
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// 处理搜索结果
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searchResult.data.messages = this.processSearchResults(
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searchResult.data.messages,
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searchParams.keyword
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);
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console.log(`🔍 搜索完成，找到 ${searchResult.data.total} 条消息`);
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return searchResult;
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} else {
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const msg = response?.message || response?.error || '搜索失败';
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throw new Error(msg);
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}
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} catch (error) {
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console.error('❌ 执行搜索失败:', error);
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return { success: false, error: error.message };
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} finally {
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this.currentSearch.loading = false;
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}
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}
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// 处理搜索结果
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processSearchResults(messages, keyword) {
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return messages.map(message => {
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// 添加高亮信息
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const highlightedContent = this.highlightKeyword(message.content, keyword);
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return {
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...message,
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highlightedContent: highlightedContent,
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searchKeyword: keyword,
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// 添加消息摘要（用于显示上下文）
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summary: this.generateMessageSummary(message.content, keyword)
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};
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});
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}
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// 关键词高亮
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highlightKeyword(content, keyword) {
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if (!content || !keyword) return content;
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try {
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// 转义特殊字符
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const escapedKeyword = keyword.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
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const regex = new RegExp(`(${escapedKeyword})`, 'gi');
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return content.replace(regex, '<mark class="search-highlight">$1</mark>');
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} catch (error) {
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console.error('❌ 关键词高亮失败:', error);
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return content;
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}
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}
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// 生成消息摘要
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generateMessageSummary(content, keyword, maxLength = 100) {
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if (!content || !keyword) return content;
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try {
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const keywordIndex = content.toLowerCase().indexOf(keyword.toLowerCase());
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if (keywordIndex === -1) return content.substring(0, maxLength);
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// 计算摘要范围
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const start = Math.max(0, keywordIndex - 30);
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const end = Math.min(content.length, keywordIndex + keyword.length + 30);
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let summary = content.substring(start, end);
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// 添加省略号
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if (start > 0) summary = '...' + summary;
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if (end < content.length) summary = summary + '...';
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return summary;
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} catch (error) {
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console.error('❌ 生成消息摘要失败:', error);
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return content.substring(0, maxLength);
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}
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}
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// 加载更多搜索结果
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async loadMoreResults() {
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if (!this.currentSearch.hasMore || this.currentSearch.loading) {
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return { success: false, error: '没有更多结果' };
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}
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const nextPage = this.currentSearch.page + 1;
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const result = await this.searchMessages(this.currentSearch.keyword, {
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type: this.currentSearch.type,
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conversationId: this.currentSearch.conversationId,
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page: nextPage
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});
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if (result.success) {
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// 合并结果
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this.currentSearch.results = [...this.currentSearch.results, ...result.data.messages];
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this.currentSearch.page = nextPage;
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this.currentSearch.hasMore = result.data.hasMore;
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}
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return result;
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}
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// 清除搜索结果
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clearSearchResults() {
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this.currentSearch = {
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keyword: '',
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type: 'all',
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conversationId: null,
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page: 1,
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hasMore: true,
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loading: false,
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results: []
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};
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}
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// 验证搜索关键词
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validateKeyword(keyword) {
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if (!keyword || typeof keyword !== 'string') {
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return false;
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}
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const trimmedKeyword = keyword.trim();
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return trimmedKeyword.length >= this.searchConfig.minKeywordLength;
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}
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// 获取消息类型代码
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getMessageTypeCode(type) {
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const typeMap = {
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'text': 0,
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'image': 1,
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'voice': 2,
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'video': 3,
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'file': 4
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};
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return typeMap[type] || null;
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}
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// 更新搜索状态
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updateSearchState(searchParams) {
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this.currentSearch = {
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keyword: searchParams.keyword,
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type: searchParams.type,
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conversationId: searchParams.conversationId,
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page: searchParams.page,
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hasMore: true,
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loading: true,
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results: []
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};
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}
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// 生成缓存键
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generateCacheKey(searchParams) {
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return `search_${searchParams.keyword}_${searchParams.type}_${searchParams.conversationId || 'global'}_${searchParams.page}`;
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}
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// 从缓存获取
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getFromCache(cacheKey) {
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const cached = this.searchCache.get(cacheKey);
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if (cached && (Date.now() - cached.timestamp) < this.searchConfig.cacheExpireTime) {
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return cached.data;
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}
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return null;
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}
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// 保存到缓存
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saveToCache(cacheKey, data) {
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this.searchCache.set(cacheKey, {
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data: data,
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timestamp: Date.now()
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});
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// 限制缓存大小
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if (this.searchCache.size > 100) {
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const firstKey = this.searchCache.keys().next().value;
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this.searchCache.delete(firstKey);
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}
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}
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// 清理过期缓存
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cleanupExpiredCache() {
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const now = Date.now();
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for (const [key, value] of this.searchCache) {
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if (now - value.timestamp > this.searchConfig.cacheExpireTime) {
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this.searchCache.delete(key);
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}
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}
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}
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// 添加到搜索历史
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addToSearchHistory(keyword) {
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const trimmedKeyword = keyword.trim();
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if (!trimmedKeyword) return;
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// 移除重复项
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this.searchHistory = this.searchHistory.filter(item => item !== trimmedKeyword);
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// 添加到开头
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this.searchHistory.unshift(trimmedKeyword);
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// 限制历史数量
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if (this.searchHistory.length > this.searchConfig.maxSearchHistory) {
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this.searchHistory = this.searchHistory.slice(0, this.searchConfig.maxSearchHistory);
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}
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// 保存到本地存储
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this.saveSearchHistory();
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}
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// 获取搜索历史
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getSearchHistory() {
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return [...this.searchHistory];
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}
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// 清除搜索历史
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clearSearchHistory() {
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this.searchHistory = [];
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this.saveSearchHistory();
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}
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// 删除搜索历史项
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removeSearchHistoryItem(keyword) {
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this.searchHistory = this.searchHistory.filter(item => item !== keyword);
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this.saveSearchHistory();
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}
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// 加载搜索历史
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async loadSearchHistory() {
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try {
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const history = wx.getStorageSync('messageSearchHistory') || [];
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this.searchHistory = history;
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} catch (error) {
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console.error('❌ 加载搜索历史失败:', error);
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}
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}
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// 保存搜索历史
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async saveSearchHistory() {
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try {
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wx.setStorageSync('messageSearchHistory', this.searchHistory);
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} catch (error) {
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console.error('❌ 保存搜索历史失败:', error);
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}
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}
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// 获取搜索建议
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getSearchSuggestions(keyword) {
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if (!keyword) return this.searchHistory.slice(0, 10);
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const lowerKeyword = keyword.toLowerCase();
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return this.searchHistory
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.filter(item => item.toLowerCase().includes(lowerKeyword))
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.slice(0, 10);
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}
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// 获取当前搜索状态
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getCurrentSearchState() {
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return { ...this.currentSearch };
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}
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// 获取搜索统计
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getSearchStats() {
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return {
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historyCount: this.searchHistory.length,
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cacheSize: this.searchCache.size,
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currentKeyword: this.currentSearch.keyword,
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isLoading: this.currentSearch.loading,
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hasResults: this.currentSearch.results.length > 0
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};
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}
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// 重置搜索管理器
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reset() {
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this.searchCache.clear();
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this.clearSearchResults();
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this.clearSearchHistory();
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}
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}
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// 创建全局实例
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const messageSearchManager = new MessageSearchManager();
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module.exports = messageSearchManager;
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