Emanuele Feronato

var game;
var ship;
var shipPosition;
var shipPositions;
var shipCanMove;
var barrierGroup;
var shipHorizontalSpeed = 400;
var shipMoveDelay = 100;
var barrierSpeed = 120;
var barrierDelay = 2000;
var verticalTween;
var shipVerticalSpeed = 20000; 
var lastClick;
var shipInvisibilityTime = 1000;

window.onload = function() {	
	game = new Phaser.Game(320, 480, Phaser.AUTO, "");
     game.state.add("PlayGame",playGame);
     game.state.start("PlayGame");
}

var playGame = function(game){};

playGame.prototype = {
	preload: function(){
          game.load.image("ship", "ship.png");
          game.load.image("barrier", "barrier.png");
	},
  	create: function(){
          shipCanMove = true;
          shipPosition = 0;
          barrierGroup = game.add.group();
          shipPositions = [40, game.width - 40];
          game.physics.startSystem(Phaser.Physics.ARCADE);
          ship = game.add.sprite(shipPositions[shipPosition], game.height - 40, "ship");
          ship.anchor.set(0.5);
          game.physics.enable(ship, Phaser.Physics.ARCADE);
          ship.body.allowRotation = false;
          ship.body.moves = false;
          game.input.onDown.add(moveShip);
          game.time.events.loop(barrierDelay, function(){
               var barrier = new Barrier(game);
               game.add.existing(barrier);
               barrierGroup.add(barrier);
          });
          verticalTween = game.add.tween(ship).to({
               y: 0
          }, shipVerticalSpeed, Phaser.Easing.Linear.None, true);          
	},
     update: function(){
          if(ship.alpha == 1){
               game.physics.arcade.collide(ship, barrierGroup, function(){
                    game.state.start("PlayGame");     
               });
          }
     }
}

function moveShip(){
     if(shipCanMove){
          lastClick = game.time.now;
          shipPosition = 1 - shipPosition;
          shipCanMove = false;
          var moveTween = game.add.tween(ship).to({ 
               x: shipPositions[shipPosition],
          }, shipHorizontalSpeed, Phaser.Easing.Linear.None, true);
          moveTween.onComplete.add(function(){
               game.time.events.add(shipMoveDelay, function(){
                    shipCanMove = true;
               });
          })
     }
     else{
          if(game.time.now - lastClick < 200 && ship.alpha == 1){
               ship.alpha = 0.5;
               verticalTween.stop();
               verticalTween = game.add.tween(ship).to({
                    y: game.height - 40
               }, 100, Phaser.Easing.Cubic.Out, true);
               verticalTween.onComplete.add(function(){
                    verticalTween = game.add.tween(ship).to({
                         y: 0
                    }, shipVerticalSpeed, Phaser.Easing.Linear.None, true); 
                    var alphaTween = game.add.tween(ship).to({
                         alpha: 1     
                    }, shipInvisibilityTime, Phaser.Easing.Linear.None, true);       
               })
          }
     }
}

Barrier = function (game) {
     var position = game.rnd.between(0, 1);
	Phaser.Sprite.call(this, game, game.width * position, -20, "barrier");
	game.physics.enable(this, Phaser.Physics.ARCADE);
     this.anchor.set(0.5);
};

Barrier.prototype = Object.create(Phaser.Sprite.prototype);
Barrier.prototype.constructor = Barrier;

Barrier.prototype.update = function() {
	this.body.velocity.y = barrierSpeed;
	if(this.y > game.height){
		this.destroy();
	}
};