const express = require('express');
const http = require('http');
const { Server } = require('socket.io');

const app = express();
const server = http.createServer(app);

// Pengaturan CORS agar bisa diakses bebas dari file HTML/APK bos
const io = new Server(server, { 
    cors: { origin: "*" } 
});

let activeUsers = 0;
let publicRooms = new Set();

function broadcastStats() {
    io.emit('stats-update', {
        activeUsers: activeUsers,
        totalRooms: publicRooms.size,
        rooms: Array.from(publicRooms)
    });
}

io.on('connection', (socket) => {
    activeUsers++;
    broadcastStats();

    // Pemain membuat room
    socket.on('create-room', (roomCode) => {
        socket.join(roomCode);
        publicRooms.add(roomCode);
        broadcastStats();
    });

    // Pemain bergabung ke room
    socket.on('join-room', (roomCode) => {
        const room = io.sockets.adapter.rooms.get(roomCode);
        if (room && room.size === 1) {
            socket.join(roomCode);
            // Sembunyikan room dari lobi karena sudah penuh (2 orang)
            publicRooms.delete(roomCode); 
            broadcastStats();
            
            // Tentukan warna: Pembuat room = Putih ('w'), Joiner = Hitam ('b')
            const clients = Array.from(room);
            io.to(clients[0]).emit('game-start', 'w');
            io.to(clients[1]).emit('game-start', 'b');
        } else {
            socket.emit('room-error', 'Room tidak ditemukan atau sudah penuh!');
        }
    });

    // Kirim langkah catur ke lawan
    socket.on('send-move', (data) => {
        socket.to(data.roomCode).emit('receive-move', data.move);
    });

    // Pemain keluar room secara manual
    socket.on('leave-room', (roomCode) => {
        socket.leave(roomCode);
        publicRooms.delete(roomCode);
        socket.to(roomCode).emit('opponent-disconnected');
        broadcastStats();
    });

    // Pemain disconnect (tutup aplikasi/hilang sinyal)
    socket.on('disconnecting', () => {
        for (const room of socket.rooms) {
            if (room !== socket.id) {
                socket.to(room).emit('opponent-disconnected');
                publicRooms.delete(room);
            }
        }
    });

    socket.on('disconnect', () => {
        activeUsers--;
        broadcastStats();
    });
});

// Port 7860 adalah aturan mutlak dari Hugging Face Spaces
const PORT = 7860;
server.listen(PORT, () => { 
    console.log(`Server CREATE BY SIGIT siap tempur di port ${PORT}`); 
});