Update code

test2/server/routes/session.js

@@ -0,0 +1,75 @@
+const express = require('express');
+const router = express.Router();
+const db = require('../db');
+
+/**
+ * GET /api/session/:id/history
+ * 获取会话完整历史（用于文字↔语音切换时加载上下文）
+ */
+router.get('/:id/history', async (req, res) => {
+  try {
+    const { id } = req.params;
+    const limit = parseInt(req.query.limit) || 20;
+    const format = req.query.format || 'llm'; // 'llm' | 'full'
+
+    let messages;
+    if (format === 'full') {
+      messages = await db.getRecentMessages(id, limit);
+    } else {
+      messages = await db.getHistoryForLLM(id, limit);
+    }
+
+    const session = await db.getSession(id);
+
+    res.json({
+      success: true,
+      data: {
+        sessionId: id,
+        mode: session?.mode || null,
+        messages,
+        count: messages.length,
+      },
+    });
+  } catch (err) {
+    console.error('[Session] Get history failed:', err.message);
+    res.status(500).json({ success: false, error: err.message });
+  }
+});
+
+/**
+ * POST /api/session/:id/switch
+ * 切换会话模式（voice ↔ chat），返回上下文历史
+ */
+router.post('/:id/switch', async (req, res) => {
+  try {
+    const { id } = req.params;
+    const { targetMode } = req.body; // 'voice' | 'chat'
+
+    if (!targetMode || !['voice', 'chat'].includes(targetMode)) {
+      return res.status(400).json({ success: false, error: 'targetMode must be "voice" or "chat"' });
+    }
+
+    // 更新会话模式
+    await db.updateSessionMode(id, targetMode);
+
+    // 返回最近的对话历史供新模式使用
+    const history = await db.getHistoryForLLM(id, 20);
+
+    console.log(`[Session] Switched ${id} to ${targetMode}, history: ${history.length} messages`);
+
+    res.json({
+      success: true,
+      data: {
+        sessionId: id,
+        mode: targetMode,
+        history,
+        count: history.length,
+      },
+    });
+  } catch (err) {
+    console.error('[Session] Switch failed:', err.message);
+    res.status(500).json({ success: false, error: err.message });
+  }
+});
+
+module.exports = router;