const express = require('express');
const http = require('http');
const socketIo = require('socket.io');
const cors = require('cors');

const app = express();
const server = http.createServer(app);
const io = socketIo(server, {
    cors: {
        origin: "*",
        methods: ["GET", "POST"]
    }
});

app.use(cors());
app.use(express.static('public'));

const users = new Map();

io.on('connection', (socket) => {
    console.log('User connected:', socket.id);

    socket.on('join-room', (nickname) => {
        socket.nickname = nickname;
        users.set(socket.id, nickname);
        
        // Notify others about new user
        socket.broadcast.emit('user-joined', nickname);
        
        console.log(`${nickname} joined the room`);
    });

    socket.on('offer', (data) => {
        console.log('Offer received from:', socket.nickname);
        socket.broadcast.emit('offer', data);
    });

    socket.on('answer', (data) => {
        console.log('Answer received from:', socket.nickname);
        socket.broadcast.emit('answer', data);
    });

    socket.on('ice-candidate', (data) => {
        console.log('ICE candidate received from:', socket.nickname);
        socket.broadcast.emit('ice-candidate', data);
    });

    socket.on('disconnect', () => {
        const nickname = users.get(socket.id);
        if (nickname) {
            users.delete(socket.id);
            socket.broadcast.emit('user-left', nickname);
            console.log(`${nickname} left the room`);
        }
    });
});

const PORT = process.env.PORT || 3000;
server.listen(PORT, () => {
    console.log(`Signaling server running on port ${PORT}`);
});