/*
 * Swipe 1.0
 *
 * Brad Birdsall, Prime
 * Copyright 2011, Licensed GPL & MIT
 *
*/

window.Swipe = function(){

  var _this = this;

  // // retreive options
  this.options = {};
  this.index = this.options.startSlide || 0;
  this.speed = this.options.speed || 300;
  this.callback = this.options.callback || function() {};
  this.delay = this.options.auto || 0;

  // // reference dom elements
  // this.container = element;
  // this.element = this.container.children[0]; // the slide pane

  // // static css
  // this.container.style.overflow = 'hidden';
  // this.element.style.listStyle = 'none';

  // // trigger slider initialization
  // this.setup();

  // // begin auto slideshow
  this.begin();

  // add event listeners
  if (document.addEventListener) {
    document.addEventListener('touchstart', this, false);
    document.addEventListener('touchmove', this, false);
    document.addEventListener('touchend', this, false);
    document.addEventListener('webkitTransitionEnd', this, false);
    document.addEventListener('msTransitionEnd', this, false);
    document.addEventListener('oTransitionEnd', this, false);
    document.addEventListener('transitionend', this, false);
    window.addEventListener('resize', this, false);
  }

};

Swipe.prototype = {

  // setup: function() {

  //   // get and measure amt of slides
  //   this.slides = this.element.children;
  //   this.length = this.slides.length;

  //   // return immediately if their are less than two slides
  //   if (this.length < 2) return null;

  //   // determine width of each slide
  //   this.width = this.container.getBoundingClientRect().width;

  //   // return immediately if measurement fails
  //   if (!this.width) return null;

  //   // hide slider element but keep positioning during setup
  //   this.container.style.visibility = 'hidden';

  //   // dynamic css
  //   this.element.style.width = (this.slides.length * this.width) + 'px';
  //   var index = this.slides.length;
  //   while (index--) {
  //     var el = this.slides[index];
  //     el.style.width = this.width + 'px';
  //     el.style.display = 'table-cell';
  //     el.style.verticalAlign = 'top';
  //   }

  //   // set start position and force translate to remove initial flickering
  //   this.slide(this.index, 0);

  //   // show slider element
  //   this.container.style.visibility = 'visible';

  // },

  // slide: function(index, duration) {

  //   var style = this.element.style;

  //   // set duration speed (0 represents 1-to-1 scrolling)
  //   style.webkitTransitionDuration = style.MozTransitionDuration = style.msTransitionDuration = style.OTransitionDuration = style.transitionDuration = duration + 'ms';

  //   // translate to given index position
  //   style.webkitTransform = 'translate3d(' + -(index * this.width) + 'px,0,0)';
  //   style.msTransform = style.MozTransform = style.OTransform = 'translateX(' + -(index * this.width) + 'px)';

  //   // set new index to allow for expression arguments
  //   this.index = index;

  // },

  // getPos: function() {

  //   // return current index position
  //   return this.index;

  // },

  // prev: function(delay) {

  //   // cancel slideshow
  //   this.delay = delay || 0;
  //   clearTimeout(this.interval);

  //   // if not at first slide
  //   if (this.index) this.slide(this.index-1, this.speed);

  // },

  // next: function(delay) {

  //   // cancel slideshow
  //   this.delay = delay || 0;
  //   clearTimeout(this.interval);

  //   if (this.index < this.length - 1) this.slide(this.index+1, this.speed); // if not last slide
  //   else this.slide(0, this.speed); //if last slide return to start

  // },

  begin: function() {

    var _this = this;

    this.interval = (this.delay)
      ? setTimeout(function() {
        _this.next(_this.delay);
      }, this.delay)
      : 0;

  },

  handleEvent: function(e) {
    switch (e.type) {
      case 'touchstart': this.onTouchStart(e); break;
      case 'touchmove': this.onTouchMove(e); break;
      case 'touchend': this.onTouchEnd(e); break;
      case 'webkitTransitionEnd':
      case 'msTransitionEnd':
      case 'oTransitionEnd':
      case 'transitionend': this.transitionEnd(e); break;
      // case 'resize': this.setup(); break;
    }
  },

  transitionEnd: function(e) {

    if (this.delay) this.begin();

    // this.callback(e, this.index, this.slides[this.index]);
    this.callback(e);

  },

  onTouchStart: function(e) {

    this.start = {

      // get touch coordinates for delta calculations in onTouchMove
      pageX: e.touches[0].pageX,
      pageY: e.touches[0].pageY,

      // set initial timestamp of touch sequence
      time: Number( new Date() )

    };

    // used for testing first onTouchMove event
    this.isScrolling = undefined;

    // reset deltaX
    this.deltaX = 0;

    // set transition time to 0 for 1-to-1 touch movement
    // this.element.style.webkitTransitionDuration = 0;

  },

  onTouchMove: function(e) {

    // ensure swiping with one touch and not pinching
    if(e.touches.length > 1 || e.scale && e.scale !== 1) return;

    this.deltaX = e.touches[0].pageX - this.start.pageX;

    // determine if scrolling test has run - one time test
    if ( typeof this.isScrolling == 'undefined') {
      this.isScrolling = !!( this.isScrolling || Math.abs(this.deltaX) < Math.abs(e.touches[0].pageY - this.start.pageY) );
    }

    // if user is not trying to scroll vertically
    if (!this.isScrolling) {

      // prevent native scrolling
      e.preventDefault();

      // // cancel slideshow
      // clearTimeout(this.interval);

      // // increase resistance if first or last slide
      // this.deltaX =
      //   this.deltaX /
      //     ( (!this.index && this.deltaX > 0               // if first slide and sliding left
      //       || this.index == this.length - 1              // or if last slide and sliding right
      //       && this.deltaX < 0                            // and if sliding at all
      //     ) ?
      //     ( Math.abs(this.deltaX) / this.width + 1 )      // determine resistance level
      //     : 1 );                                          // no resistance if false

      // translate immediately 1-to-1
      // this.element.style.webkitTransform = 'translate3d(' + (this.deltaX - this.index * this.width) + 'px,0,0)';

    }

  },

  onTouchEnd: function(e) {

    // determine if slide attempt triggers next/prev slide
    var isValidSlide =
          Number(new Date()) - this.start.time < 250      // if slide duration is less than 250ms
          && Math.abs(this.deltaX) > 20,                   // and if slide amt is greater than 20px

    // determine if slide attempt is past start and end
        isPastBounds =
          !this.index && this.deltaX > 0                          // if first slide and slide amt is greater than 0
          || this.index == this.length - 1 && this.deltaX < 0;    // or if last slide and slide amt is less than 0

    // if not scrolling vertically
    if (!this.isScrolling && isValidSlide) {
      // call slide function with slide end value based on isValidSlide and isPastBounds tests
      // this.slide( this.index + ( isValidSlide && !isPastBounds ? (this.deltaX < 0 ? 1 : -1) : 0 ), this.speed );
      (this.deltaX < 0) ? slideLeft() : slideRight();
    }

  }

};
new Swipe();