调整了整个框架，模块化解耦

js/services/conversation-service.js

@@ -0,0 +1,118 @@
+(function (global) {
+  'use strict';
+
+  /**
+   * 管理模块化对话历史及上下文构建
+   */
+  class ConversationService {
+    constructor(storageService, defaultOptions = {}) {
+      if (!storageService) {
+        throw new Error('ConversationService 需要 StorageService 实例');
+      }
+      this.storageService = storageService;
+      this.defaultOptions = {
+        historyKey: 'history',
+        contextWindow: 10,
+        ...defaultOptions
+      };
+      this.cache = new Map();
+    }
+
+    _getHistoryKey(moduleConfig) {
+      return moduleConfig.storageKeys?.history || this.defaultOptions.historyKey;
+    }
+
+    _getNamespace(moduleConfig) {
+      const namespace =
+        moduleConfig.storageNamespace || `module:${moduleConfig.id}`;
+      return this.storageService.namespace(namespace);
+    }
+
+    _getCacheKey(moduleId) {
+      return `history:${moduleId}`;
+    }
+
+    getHistory(moduleConfig) {
+      const cacheKey = this._getCacheKey(moduleConfig.id);
+      if (this.cache.has(cacheKey)) {
+        return this.cache.get(cacheKey);
+      }
+
+      const store = this._getNamespace(moduleConfig);
+      const history =
+        store.get(this._getHistoryKey(moduleConfig), []).map((msg) => ({
+          ...msg
+        }));
+
+      this.cache.set(cacheKey, history);
+      return history;
+    }
+
+    saveHistory(moduleConfig, history) {
+      const cacheKey = this._getCacheKey(moduleConfig.id);
+      const clonedHistory = history.map((msg) => ({ ...msg }));
+      this.cache.set(cacheKey, clonedHistory);
+
+      const store = this._getNamespace(moduleConfig);
+      store.set(this._getHistoryKey(moduleConfig), clonedHistory);
+    }
+
+    appendMessage(moduleConfig, message) {
+      const history = this.getHistory(moduleConfig);
+      history.push({ ...message });
+      this.saveHistory(moduleConfig, history);
+      return history;
+    }
+
+    replaceHistory(moduleConfig, history) {
+      this.saveHistory(moduleConfig, history);
+    }
+
+    clearHistory(moduleConfig) {
+      this.saveHistory(moduleConfig, []);
+    }
+
+    /**
+     * 构建流式上下文，为最后一个用户消息提供所需历史
+     */
+    buildContext(moduleConfig, tailMessages = null) {
+      const history = this.getHistory(moduleConfig);
+      if (!history.length) return null;
+
+      let targetIndex = history.length - 1;
+      if (tailMessages != null) {
+        targetIndex = Math.max(0, history.length - tailMessages);
+      }
+
+      // 确保目标是用户消息
+      while (targetIndex >= 0 && history[targetIndex].type !== 'user') {
+        targetIndex -= 1;
+      }
+
+      if (targetIndex < 0) {
+        return null;
+      }
+
+      const contextWindow =
+        moduleConfig.chat?.contextWindow || this.defaultOptions.contextWindow;
+      const start = Math.max(0, targetIndex - contextWindow);
+      const contextSlice = history.slice(start, targetIndex);
+
+      const contextMessages = contextSlice
+        .filter((msg) => msg.type === 'user' || msg.type === 'ai')
+        .map((msg) => ({
+          role: msg.type === 'user' ? 'user' : 'assistant',
+          content: msg.content
+        }));
+
+      return {
+        history,
+        userMessage: history[targetIndex],
+        contextMessages,
+        targetIndex
+      };
+    }
+  }
+
+  global.ConversationService = ConversationService;
+})(window);