const app = require('express')();
const server = require('http').createServer(app);
const io = require('socket.io')(server, {
    cors: {
        origin: "*", // Allow all origins for dev
        methods: ["GET", "POST"]
    }
});

const players = {};

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

    // Initialize player data
    players[socket.id] = {
        id: socket.id,
        x: 0,
        y: 0,
        anim: 'idle'
    };

    // Send the current list of players to the new player
    socket.emit('currentPlayers', players);

    // Notify other players about the new player
    socket.broadcast.emit('newPlayer', players[socket.id]);

    // Handle Disconnect
    socket.on('disconnect', () => {
        console.log('Player disconnected:', socket.id);
        delete players[socket.id];
        io.emit('playerDisconnected', socket.id);
    });

    // Handle Movement
    socket.on('playerMovement', (data) => {
        if (players[socket.id]) {
            players[socket.id].x = data.x;
            players[socket.id].y = data.y;
            players[socket.id].anim = data.anim;
            players[socket.id].flipX = data.flipX;

            // Broadcast to others (excluding self)
            socket.broadcast.emit('playerMoved', players[socket.id]);
        }
    });

    // Handle World State (Simple Block Placement sync)
    // Warning: No validation/persistence in this MVP
    socket.on('worldAction', (action) => {
        // action: { type: 'build', x: 10, y: 10, building: 'fence' }
        socket.broadcast.emit('worldAction', action);
    });
});

const PORT = 3000;
server.listen(PORT, () => {
    console.log(`SERVER RUNNING on port ${PORT}`);
    console.log(`To play multiplayer:`);
    console.log(`1. Run 'node server.js' in a terminal`);
    console.log(`2. Start the game clients`);
});