langgraph_used

src/screens/FlowScreen.tsx

@@ -31,6 +31,8 @@ import * as ImagePicker from 'expo-image-picker';
 import { AIRole } from '../types';
 import { colors, typography, spacing, borderRadius, shadows } from '../theme/colors';
 import { aiService, AIMessage } from '../services/ai.service';
+import { langGraphService } from '../services/langgraph.service';
+import { HumanMessage, AIMessage as LangChainAIMessage, SystemMessage } from "@langchain/core/messages";
 import { assetsService } from '../services/assets.service';
 import { useAuth } from '../context/AuthContext';
 import { AI_CONFIG, getVaultStorageKeys } from '../config';
@@ -280,8 +282,23 @@ export default function FlowScreen() {
     setMessages(prev => [...prev, userMsg]);
 
     try {
-      // Call AI proxy with selected role's system prompt
-      const aiResponse = await aiService.sendMessage(userMessage, token, selectedRole?.systemPrompt || '');
+      // 1. Convert current messages history to LangChain format
+      const history: (HumanMessage | LangChainAIMessage | SystemMessage)[] = messages.map(msg => {
+        if (msg.role === 'user') return new HumanMessage(msg.content);
+        return new LangChainAIMessage(msg.content);
+      });
+
+      // 2. Add system prompt
+      const systemPrompt = new SystemMessage(selectedRole?.systemPrompt || '');
+
+      // 3. Add current new message
+      const currentMsg = new HumanMessage(userMessage);
+
+      // 4. Combine all messages for LangGraph processing
+      const fullMessages = [systemPrompt, ...history, currentMsg];
+
+      // 5. Execute via LangGraph service (handles token limits and context)
+      const aiResponse = await langGraphService.execute(fullMessages, token);
 
       // Add AI response
       const aiMsg: ChatMessage = {