Emanuele Feronato

var game;
var goat;
var player;
var targetX;
var isPressed = false;
var deltaSpeed = 10;
var rounds;

window.onload = function() {	
	game = new Phaser.Game(800, 160, Phaser.AUTO, "");
     game.state.add("PlayGame", playGame);
     game.state.start("PlayGame");
}

var playGame = function(game){};

playGame.prototype = {
     preload: function(){
           game.load.image("goat", "goat.png");
           game.load.image("player", "player.png");
     },
     create: function(){
          game.stage.backgroundColor = 0x74af21;
          rounds = -1;
          game.physics.startSystem(Phaser.Physics.ARCADE);
          goat = game.add.sprite(game.width / 2, game.height, "goat");
          goat.anchor.set(0.5, 1);
          player = goat.addChild(game.make.sprite(0, - goat.height + 20, "player"));
          player.anchor.set(0.5, 1);
          game.physics.enable(goat, Phaser.Physics.ARCADE);
          game.input.onDown.add(function(){
               isPressed = true; 
               if(rounds == -1){
                    if(game.rnd.between(0 , 1) == 0){
                         goatLeft();
                    }
                    else{
                         goatRight();
                    }     
               }         
          });
          game.input.onUp.add(function(){
               isPressed = false;
          });
     },
     update: function(){
          if(player.x > - goat.width / 2 && player.x < goat.width / 2){
               if((goat.body.velocity.x > 0 && !isPressed) || (goat.body.velocity.x < 0 && isPressed)){
                    player.body.velocity.x = -goat.body.velocity.x
               }
               else{
                    player.body.velocity.x = 0     
               }
               if(goat.body.velocity.x > 0 && goat.x >= targetX){
                    goatLeft();
                    
               }
               if(goat.body.velocity.x < 0 && goat.x <= targetX){
                    goatRight();
               }     
          }
          else{
               goat.body.velocity.x = 0;
               player.body.velocity.x = 0;
          }
     }
}

function goatLeft(){
     rounds ++;
     goat.body.velocity.x = game.rnd.between(-200 - deltaSpeed * rounds, -100 - deltaSpeed * rounds);
     targetX = game.rnd.between(goat.x - goat.width / 2, goat.width / 2);
     goat.tint = 0xffffff;
}


function goatRight(){
     rounds ++;
     goat.body.velocity.x = game.rnd.between(100 + deltaSpeed * rounds, 200 + deltaSpeed *rounds);
     targetX = game.rnd.between(goat.x + goat.width, game.width - goat.width / 2);
     goat.tint = 0xff0000;
}