Ticker.start();

var Game = {
  canvas: document.getElementById('game'),
  keysDown: {},
  start: function() {
    Game.sceneManager.push(MainMenu);
    Ticker.addListener(function(dt) {
      Game.sceneManager.update(dt);
      Game.sceneManager.draw();
    });
  },
  pause: function() {
    Game.sceneManager.push(PauseScreen);
  },
  sceneManager: {
    sceneStack: [],
    currentScene: null,
    update: function(delta) {
      if(this.currentScene) this.currentScene._update(delta);
    },
    draw: function() {
      if(this.currentScene) this.currentScene._draw();
    },
    push: function(scene) {
      if(this.currentScene) this.currentScene.pause();
      this.sceneStack.push(scene);
      if(!scene.hasTicker) scene._init();
      scene.load();
      this.currentScene = scene;
    },
    pop: function() {
      var scene = this.sceneStack.pop();
      scene.unload();
      this.currentScene = this.sceneStack[this.sceneStack.length-1];
      this.currentScene.resume();
    }
  }
};

(function() {
  Game.context = Game.canvas.getContext('2d');

  addEventListener('keydown', function(e) {
    Game.keysDown[e.keyCode] = true;
  }, false);

  addEventListener('keyup', function(e) {
    delete Game.keysDown[e.keyCode];
  }, false);

  var soundDeferred = Q.defer();
  soundManager.setup({
    url: 'swf/',
    flashVersion: 9,
    onready: function() {
      soundDeferred.resolve(this);
    }
  });
  soundDeferred.promise
    .then(function() {
      return [
        createSound('confirm', 'sound/confirm.mp3'),
        createSound('back', 'sound/back.mp3'),
        createSound('pause', 'sound/pause.mp3')
      ]
    })
    .done(function() {
      Game.start();
    });
})();

function Scene() {}

Scene.prototype._init = function() {
  makeObservable(this);
};

Scene.prototype._update = function(dt) {
  this.notify(dt);
  this.update(dt);
};

Scene.prototype._draw = function() {
  this.draw();
};

Scene.prototype.tween = function(from) {
  var tween = new DeferredTween(from);
  tween.ticker = this.ticker;
  return tween;
};

var MainMenu = new Scene();
(function() {
  function onKeyUp() {
    var beats = [
      {url: 'sound/b1.mp3', duration: 4000},
      {url: 'sound/b2.mp3', duration: 4000},
      {url: 'sound/b3.mp3', duration: 4000},
      {url: 'sound/b4.mp3', duration: 4000},
      {url: 'sound/b5.mp3', duration: 4000}
    ];

    Game.sceneManager.push(new SoundSafari(beats));
    soundManager.play('confirm');
  }
  MainMenu.update = function() {};
  MainMenu.draw = function() {
    Game.context.fillStyle = 'black';
    Game.context.fillRect(0, 0, Game.canvas.width, Game.canvas.height);
    Game.context.fillStyle = 'white';
    Game.context.textAlign = 'center';
    Game.context.fillText('Audventure', Game.canvas.width/2, Game.canvas.height/2 - 20);
    Game.context.fillText('Press any key to start', Game.canvas.width/2, Game.canvas.height/2 + 20);
  };
  MainMenu.load = MainMenu.resume = function() {
    addEventListener('keypress', onKeyUp);
  };
  MainMenu.unload = MainMenu.pause = function() {
    removeEventListener('keypress', onKeyUp);
  };
})();

var PauseScreen = new Scene();
(function() {
  var onKeyUp = function(e) {
    switch(e.charCode) {
      case 81:
      case 113:
      case 27:
        Game.sceneManager.pop();
      case 80:
      case 112:
      case 32:
        Game.sceneManager.pop();
        soundManager.play('back');
    }
  };
  PauseScreen.load = PauseScreen.resume = function() {
    addEventListener('keypress', onKeyUp);
  };
  PauseScreen.unload = PauseScreen.pause = function() {
    removeEventListener('keypress', onKeyUp);
  };
  PauseScreen.update = function() {};
  PauseScreen.draw = function() {
    Game.context.fillStyle = 'black';
    Game.context.fillRect(0, 0, Game.canvas.width, Game.canvas.height);
    Game.context.fillStyle = 'white';
    Game.context.textAlign = 'center';
    Game.context.fillText('Paused', Game.canvas.width/2, Game.canvas.height/2 - 30);
    Game.context.fillText('P to unpause', Game.canvas.width/2, Game.canvas.height/2);
    Game.context.fillText('Q to quit', Game.canvas.width/2, Game.canvas.height/2 + 20);
  };
})();