const express = require('express');
const cors = require('cors');
const { AccessToken } = require('livekit-server-sdk');
require('dotenv').config();

const app = express();
app.use(cors());
app.use(express.json());

const LIVEKIT_API_KEY = process.env.LIVEKIT_API_KEY || 'APIEivUcPW3WSrV';
const LIVEKIT_API_SECRET = process.env.LIVEKIT_API_SECRET || 'A65mc5KUKE0VGdZNaMRwe6uJpA9ZQPAxS66akZTOfmL';
const LIVEKIT_URL = 'wss://live-kit-demo-70txlh6a.livekit.cloud';
// ROBUST MODE: Use julia-robust agent (no barge-in)
const AGENT_NAME = 'julia-robust';

// Health check
app.get('/health', (req, res) => {
  res.json({ status: 'ok', agent: AGENT_NAME, url: LIVEKIT_URL });
});

// Generate LiveKit token
app.post('/token', async (req, res) => {
  try {
    const { userId } = req.body;
    const identity = userId || `user-${Date.now()}`;
    const roomName = `julia-room-${Date.now()}`;

    const token = new AccessToken(LIVEKIT_API_KEY, LIVEKIT_API_SECRET, {
      identity: identity,
      ttl: 3600, // 1 hour
    });

    token.addGrant({
      room: roomName,
      roomJoin: true,
      canPublish: true,
      canSubscribe: true,
      canPublishData: true,
    });

    // Request Julia AI agent to join the room
    token.roomConfig = {
      agents: [{ agentName: AGENT_NAME }],
    };

    const jwt = await token.toJwt();

    res.json({
      success: true,
      data: {
        token: jwt,
        roomName: roomName,
        wsUrl: LIVEKIT_URL,
        identity: identity,
      },
    });
  } catch (error) {
    console.error('Token generation error:', error);
    res.status(500).json({ success: false, error: error.message });
  }
});

const PORT = process.env.PORT || 3001;
app.listen(PORT, () => {
  console.log(`Julia Token Server running on port ${PORT}`);
  console.log(`LiveKit URL: ${LIVEKIT_URL}`);
  console.log(`Agent: ${AGENT_NAME}`);
});