(function() {
  
    var currentToast;
  
    Polymer('paper-toast', {
  
      /**
       * The text shows in a toast.
       *
       * @attribute text
       * @type string
       * @default ''
       */
      text: '',
      
      /**
       * The duration in milliseconds to show the toast.
       *
       * @attribute duration
       * @type number
       * @default 3000
       */
      duration: 3000,
      
      /**
       * Set opened to true to show the toast and to false to hide it.
       *
       * @attribute opened
       * @type boolean
       * @default false
       */
      opened: false,
      
      /**
       * Min-width when the toast changes to narrow layout.  In narrow layout,
       * the toast fits at the bottom of the screen when opened.
       *
       * @attribute responsiveWidth
       * @type string
       * @default '480px'
       */
      responsiveWidth: '480px',
      
      /**
       * If true, the toast can't be swiped.
       *
       * @attribute swipeDisabled
       * @type boolean
       * @default false
       */
      swipeDisabled: false,
      
      eventDelegates: {
        trackstart: 'trackStart',
        track: 'track',
        trackend: 'trackEnd',
        transitionend: 'transitionEnd'
      },
      
      narrowModeChanged: function() {
        this.classList.toggle('fit-bottom', this.narrowMode);
      },
      
      openedChanged: function() {
        if (this.opened) {
          this.dismissJob = this.job(this.dismissJob, this.dismiss, this.duration);
        } else {
          this.dismissJob && this.dismissJob.stop();
          this.dismiss();
        }
      },
      
      /** 
       * Toggle the opened state of the toast.
       * @method toggle
       */
      toggle: function() {
        this.opened = !this.opened;
      },
      
      /** 
       * Show the toast for the specified duration
       * @method show
       */
      show: function() {
        if (currentToast) {
          currentToast.dismiss();
        }
        currentToast = this;
        this.opened = true;
      },
      
      /** 
       * Dismiss the toast and hide it.
       * @method dismiss
       */
      dismiss: function() {
        if (this.dragging) {
          this.shouldDismiss = true;
        } else {
          this.opened = false;
          if (currentToast === this) {
            currentToast = null;
          }
        }
      },
      
      trackStart: function(e) {
        if (!this.swipeDisabled) {
          e.preventTap();
          this.vertical = e.yDirection;
          this.w = this.offsetWidth;
          this.h = this.offsetHeight;
          this.dragging = true;
          this.classList.add('dragging');
        }
      },
      
      track: function(e) {
        if (this.dragging) {
          var s = this.style;
          if (this.vertical) {
            var y = e.dy;
            s.opacity = (this.h - Math.abs(y)) / this.h;
            s.webkitTransform = s.transform =  'translate3d(0, ' + y + 'px, 0)';
          } else {
            var x = e.dx;
            s.opacity = (this.w - Math.abs(x)) / this.w;
            s.webkitTransform = s.transform = 'translate3d(' + x + 'px, 0, 0)';
          }
        }
      },
      
      trackEnd: function(e) {
        if (this.dragging) {
          this.classList.remove('dragging');
          this.style.opacity = null;
          this.style.webkitTransform = this.style.transform = null;
          var cl = this.classList;
          if (this.vertical) {
            cl.toggle('fade-out-down', e.yDirection === 1 && e.dy > 0);
            cl.toggle('fade-out-up', e.yDirection === -1 && e.dy < 0);
          } else {
            cl.toggle('fade-out-right', e.xDirection === 1 && e.dx > 0);
            cl.toggle('fade-out-left', e.xDirection === -1 && e.dx < 0);
          }
          this.dragging = false;
        }
      },
      
      transitionEnd: function() {
        var cl = this.classList;
        if (cl.contains('fade-out-right') || cl.contains('fade-out-left') || 
            cl.contains('fade-out-down') || cl.contains('fade-out-up')) {
          this.dismiss();
          cl.remove('fade-out-right', 'fade-out-left', 
              'fade-out-down', 'fade-out-up');
        } else if (this.shouldDismiss) {
          this.dismiss();
        }
        this.shouldDismiss = false;
      }
  
    });
    
  })();