var express = require('express'),
      app = module.exports = express.createServer(),
      io = require('socket.io').listen(app);
  
  app.configure(function(){
    app.use(express.bodyParser());
    app.use(express.static(__dirname + '/public'));
  });
  
  app.listen(3000);
  
  var games = [];
  
  io.sockets.on('connection',function(socket) {
    var game = null;
    for(var i=0;i<games.length;i++) {
      if(games[i].length < 2) {
        game = i;
      }
    }
  
    if(game === null) {
      games.push([])
      game = games.length-1;
    }
  
    games[game].push(socket);
  
    socket.set('game',game);
  
    if(games[game].length == 2) {
      games[game][0].set('partner',socket);
      games[game][1].set('partner',games[game][0]);
  
      games[game][0].emit('master');
      games[game][1].emit('slave');
    }
  
    socket.on('delay',function(data) {
      socket.get('partner',function(err,partner) {
        if(partner) {
          data.steps += 1;
          partner.emit('delay',data);
        } 
      });
    });
  
    socket.on('move',function(data) {
      socket.get('partner',function(err,partner) {
        if(partner) {
          partner.volatile.emit('move',data);
        } 
      });
    });
  
    socket.on('ball',function(data) {
      socket.get('partner',function(err,partner) {
        if(partner) {
          partner.volatile.emit('ball',data);
        } 
      });
    });
  
    socket.on('disconnect',function() {
      socket.get('partner',function(err,partner) {
        if(partner) {
          partner.emit('end');
          partner.set("partner",null);
        }
      });
      socket.get('game',function(err,game) {
        var idx = games[game].indexOf(socket);
        if(idx!=-1) games[game].splice(idx, 1);
      });
    });
  });