var Tracker = Fiber.extend(function(base){

	var exports = {
		init: function(opt){
		  this.wall_id = null
		  this.scenery_id = null
		  this.clicks = 0
		  
		  this.wallTimer = new Timer ()
		  this.roomTimer = new Timer ()
		  this.sceneryTimer = new Timer ()

		  this.events = []
		  
		  this.bind()
		  this.trackPageview()
		},
		
		bind: function () {
		  window.addEventListener("click", this.trackClick.bind(this), true)
		  app.on("change-wall", this.changeWall.bind(this))
		  app.on("pick-scenery", this.pickScenery.bind(this))
		  app.on("close-scenery", this.trackScenery.bind(this))
		  app.on("change-room", this.changeRoom.bind(this))
		},

		pushEvent: function(event){
		  this.events.push(event)
		},
		
		trackPageview: function(opt){
      this.pushEvent([ "view" ])
		},

    //
    // how long they spend in front of each wall

		changeWall: function(opt){
		  var duration = this.wallTimer.currentTime()
		  if (this.wall_id && duration > 5000) {
        this.pushEvent([ "wall", this.wall_id, duration ])
		  }
      this.wall_id = opt.wall.id
      this.wallTimer.start()
		},
		
    //
    // how long the user spends on each item they click
    
		pickScenery: function(opt){
		  if (this.scenery_id && opt.scenery.id !== this.scenery_id) {
		    this.trackScenery()
		  }
		  else {
        this.sceneryTimer.start()
		  }
		  this.scenery_id = opt.scenery.id
		},
		
		trackScenery: function(){
		  var duration = this.sceneryTimer.currentTime()
		  if (this.scenery_id && duration > 5000) {
        this.pushEvent([ "scenery", this.scenery_id, duration ])
		  }
      this.scenery_id = null
      this.sceneryTimer.reset()
		},

		//
    // how long they spend in the room

		changeRoom: function(opt){
		  var duration = this.roomTimer.currentTime()
		  if (this.room_id !== opt.room.id) {
		    if (this.room_id && duration > 5000) {
          this.pushEvent([ "room", this.room_id, duration ])
        }
        this.roomTimer.start()
        this.room_id = opt.room.id
		  }
		},
		
    //
    // how many clicks per room

		trackClick: function(opt){
      this.clicks += 1
		},
		
		save: function () {
		  // possibly just push to google analytics
		},
		
  }
  
  return exports
})


var Timer = Fiber.extend(function(base){
  var exports = {

    init: function(opt){
      this.time = 0
    },
    
    reset: function(){
      this.time = 0
    },
    
    start: function(){
      this.time = Date.now()
    },

    currentTime: function(){
      return this.time ? Date.now() - this.time : 0
    },
  }
  
  return exports
})