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...................................................................................................................................../**
 * jQuery || Zepto Parallax Plugin
 * @author Matthew Wagerfield - @wagerfield
 * @description Creates a parallax effect between an array of layers,
 *              driving the motion from the gyroscope output of a smartdevice.
 *              If no gyroscope is available, the cursor position is used.
 */
;(function($, window, document, undefined) {

  // Strict Mode
  'use strict';

  // Constants
  var NAME = 'parallax';
  var MAGIC_NUMBER = 30;
  var DEFAULTS = {
    relativeInput: false,
    clipRelativeInput: false,
    calibrationThreshold: 100,
    calibrationDelay: 500,
    supportDelay: 500,
    calibrateX: false,
    calibrateY: true,
    invertX: true,
    invertY: true,
    limitX: false,
    limitY: false,
    scalarX: 10.0,
    scalarY: 10.0,
    frictionX: 0.1,
    frictionY: 0.1,
    originX: 0.5,
    originY: 0.5,
    pointerEvents: true,
    precision: 1
  };

  function Plugin(element, options) {

    // DOM Context
    this.element = element;

    // Selections
    this.$context = $(element).data('api', this);
    this.$layers = this.$context.find('.layer');

    // Data Extraction
    var data = {
      calibrateX: this.$context.data('calibrate-x') || null,
      calibrateY: this.$context.data('calibrate-y') || null,
      invertX: this.$context.data('invert-x') || null,
      invertY: this.$context.data('invert-y') || null,
      limitX: parseFloat(this.$context.data('limit-x')) || null,
      limitY: parseFloat(this.$context.data('limit-y')) || null,
      scalarX: parseFloat(this.$context.data('scalar-x')) || null,
      scalarY: parseFloat(this.$context.data('scalar-y')) || null,
      frictionX: parseFloat(this.$context.data('friction-x')) || null,
      frictionY: parseFloat(this.$context.data('friction-y')) || null,
      originX: parseFloat(this.$context.data('origin-x')) || null,
      originY: parseFloat(this.$context.data('origin-y')) || null,
      pointerEvents: this.$context.data('pointer-events') || true,
      precision: parseFloat(this.$context.data('precision')) || 1
    };

    // Delete Null Data Values
    for (var key in data) {
      if (data[key] === null) delete data[key];
    }

    // Compose Settings Object
    $.extend(this, DEFAULTS, options, data);

    // States
    this.calibrationTimer = null;
    this.calibrationFlag = true;
    this.enabled = false;
    this.depthsX = [];
    this.depthsY = [];
    this.raf = null;

    // Element Bounds
    this.bounds = null;
    this.ex = 0;
    this.ey = 0;
    this.ew = 0;
    this.eh = 0;

    // Element Center
    this.ecx = 0;
    this.ecy = 0;

    // Element Range
    this.erx = 0;
    this.ery = 0;

    // Calibration
    this.cx = 0;
    this.cy = 0;

    // Input
    this.ix = 0;
    this.iy = 0;

    // Motion
    this.mx = 0;
    this.my = 0;

    // Velocity
    this.vx = 0;
    this.vy = 0;

    // Callbacks
    this.onMouseMove = this.onMouseMove.bind(this);
    this.onDeviceOrientation = this.onDeviceOrientation.bind(this);
    this.onOrientationTimer = this.onOrientationTimer.bind(this);
    this.onCalibrationTimer = this.onCalibrationTimer.bind(this);
    this.onAnimationFrame = this.onAnimationFrame.bind(this);
    this.onWindowResize = this.onWindowResize.bind(this);

    // Initialise
    this.initialise();
  }

  Plugin.prototype.transformSupport = function(value) {
    var element = document.createElement('div');
    var propertySupport = false;
    var propertyValue = null;
    var featureSupport = false;
    var cssProperty = null;
    var jsProperty = null;
    for (var i = 0, l = this.vendors.length; i < l; i++) {
      if (this.vendors[i] !== null) {
        cssProperty = this.vendors[i][0] + 'transform';
        jsProperty = this.vendors[i][1] + 'Transform';
      } else {
        cssProperty = 'transform';
        jsProperty = 'transform';
      }
      if (element.style[jsProperty] !== undefined) {
        propertySupport = true;
        break;
      }
    }
    switch(value) {
      case '2D':
        featureSupport = propertySupport;
        break;
      case '3D':
        if (propertySupport) {
          var body = document.body || document.createElement('body');
          var documentElement = document.documentElement;
          var documentOverflow = documentElement.style.overflow;
          var isCreatedBody = false;
          if (!document.body) {
            isCreatedBody = true;
            documentElement.style.overflow = 'hidden';
            documentElement.appendChild(body);
            body.style.overflow = 'hidden';
            body.style.background = '';
          }
          body.appendChild(element);
          element.style[jsProperty] = 'translate3d(1px,1px,1px)';
          propertyValue = window.getComputedStyle(element).getPropertyValue(cssProperty);
          featureSupport = propertyValue !== undefined && propertyValue.length > 0 && propertyValue !== "none";
          documentElement.style.overflow = documentOverflow;
          body.removeChild(element);
          if ( isCreatedBody ) {
            body.removeAttribute('style');
            body.parentNode.removeChild(body);
          }
        }
        break;
    }
    return featureSupport;
  };

  Plugin.prototype.ww = null;
  Plugin.prototype.wh = null;
  Plugin.prototype.wcx = null;
  Plugin.prototype.wcy = null;
  Plugin.prototype.wrx = null;
  Plugin.prototype.wry = null;
  Plugin.prototype.portrait = null;
  Plugin.prototype.desktop = !navigator.userAgent.match(/(iPhone|iPod|iPad|Android|BlackBerry|BB10|mobi|tablet|opera mini|nexus 7)/i);
  Plugin.prototype.vendors = [null,['-webkit-','webkit'],['-moz-','Moz'],['-o-','O'],['-ms-','ms']];
  Plugin.prototype.motionSupport = !!window.DeviceMotionEvent;
  Plugin.prototype.orientationSupport = !!window.DeviceOrientationEvent;
  Plugin.prototype.orientationStatus = 0;
  Plugin.prototype.transform2DSupport = Plugin.prototype.transformSupport('2D');
  Plugin.prototype.transform3DSupport = Plugin.prototype.transformSupport('3D');
  Plugin.prototype.propertyCache = {};

  Plugin.prototype.initialise = function() {

    // Configure Styles
    if (this.$context.css('position') === 'static') {
      this.$context.css({
        position:'relative'
      });
    }

    // Pointer events
    if(!this.pointerEvents){
      this.$context.css({
        pointerEvents: 'none'
      });
    }

    // Hardware Accelerate Context
    this.accelerate(this.$context);

    // Setup
    this.updateLayers();
    this.updateDimensions();
    this.enable();
    this.queueCalibration(this.calibrationDelay);
  };

  Plugin.prototype.updateLayers = function() {

    // Cache Layer Elements
    this.$layers = this.$context.find('.layer');
    this.depthsX = [];
    this.depthsY = [];

    // Configure Layer Styles
    this.$layers.css({
      position:'absolute',
      display:'block',
      left: 0,
      top: 0
    });
    this.$layers.first().css({
      position:'relative'
    });

    // Hardware Accelerate Layers
    this.accelerate(this.$layers);

    // Cache Depths
    this.$layers.each($.proxy(function(index, element) {
      //Graceful fallback on depth if depth-x or depth-y is absent
      var depth = $(element).data('depth') || 0;
      this.depthsX.push($(element).data('depth-x') || depth);
      this.depthsY.push($(element).data('depth-y') || depth);
    }, this));
  };

  Plugin.prototype.updateDimensions = function() {
    this.ww = window.innerWidth;
    this.wh = window.innerHeight;
    this.wcx = this.ww * this.originX;
    this.wcy = this.wh * this.originY;
    this.wrx = Math.max(this.wcx, this.ww - this.wcx);
    this.wry = Math.max(this.wcy, this.wh - this.wcy);
  };

  Plugin.prototype.updateBounds = function() {
    this.bounds = this.element.getBoundingClientRect();
    this.ex = this.bounds.left;
    this.ey = this.bounds.top;
    this.ew = this.bounds.width;
    this.eh = this.bounds.height;
    this.ecx = this.ew * this.originX;
    this.ecy = this.eh * this.originY;
    this.erx = Math.max(this.ecx, this.ew - this.ecx);
    this.ery = Math.max(this.ecy, this.eh - this.ecy);
  };

  Plugin.prototype.queueCalibration = function(delay) {
    clearTimeout(this.calibrationTimer);
    this.calibrationTimer = setTimeout(this.onCalibrationTimer, delay);
  };

  Plugin.prototype.enable = function() {
    if (!this.enabled) {
      this.enabled = true;
      if (this.orientationSupport) {
        this.portrait = null;
        window.addEventListener('deviceorientation', this.onDeviceOrientation);
        setTimeout(this.onOrientationTimer, this.supportDelay);
      } else {
        this.cx = 0;
        this.cy = 0;
        this.portrait = false;
        window.addEventListener('mousemove', this.onMouseMove);
      }
      window.addEventListener('resize', this.onWindowResize);
      this.raf = requestAnimationFrame(this.onAnimationFrame);
    }
  };

  Plugin.prototype.disable = function() {
    if (this.enabled) {
      this.enabled = false;
      if (this.orientationSupport) {
        window.removeEventListener('deviceorientation', this.onDeviceOrientation);
      } else {
        window.removeEventListener('mousemove', this.onMouseMove);
      }
      window.removeEventListener('resize', this.onWindowResize);
      cancelAnimationFrame(this.raf);
    }
  };

  Plugin.prototype.calibrate = function(x, y) {
    this.calibrateX = x === undefined ? this.calibrateX : x;
    this.calibrateY = y === undefined ? this.calibrateY : y;
  };

  Plugin.prototype.invert = function(x, y) {
    this.invertX = x === undefined ? this.invertX : x;
    this.invertY = y === undefined ? this.invertY : y;
  };

  Plugin.prototype.friction = function(x, y) {
    this.frictionX = x === undefined ? this.frictionX : x;
    this.frictionY = y === undefined ? this.frictionY : y;
  };

  Plugin.prototype.scalar = function(x, y) {
    this.scalarX = x === undefined ? this.scalarX : x;
    this.scalarY = y === undefined ? this.scalarY : y;
  };

  Plugin.prototype.limit = function(x, y) {
    this.limitX = x === undefined ? this.limitX : x;
    this.limitY = y === undefined ? this.limitY : y;
  };

  Plugin.prototype.origin = function(x, y) {
    this.originX = x === undefined ? this.originX : x;
    this.originY = y === undefined ? this.originY : y;
  };

  Plugin.prototype.clamp = function(value, min, max) {
    value = Math.max(value, min);
    value = Math.min(value, max);
    return value;
  };

  Plugin.prototype.css = function(element, property, value) {
    var jsProperty = this.propertyCache[property];
    if (!jsProperty) {
      for (var i = 0, l = this.vendors.length; i < l; i++) {
        if (this.vendors[i] !== null) {
          jsProperty = $.camelCase(this.vendors[i][1] + '-' + property);
        } else {
          jsProperty = property;
        }
        if (element.style[jsProperty] !== undefined) {
          this.propertyCache[property] = jsProperty;
          break;
        }
      }
    }
    element.style[jsProperty] = value;
  };

  Plugin.prototype.accelerate = function($element) {
    for (var i = 0, l = $element.length; i < l; i++) {
      var element = $element[i];
      this.css(element, 'transform', 'translate3d(0,0,0)');
      this.css(element, 'transform-style', 'preserve-3d');
      this.css(element, 'backface-visibility', 'hidden');
    }
  };

  Plugin.prototype.setPosition = function(element, x, y) {
    x += 'px';
    y += 'px';
    if (this.transform3DSupport) {
      this.css(element, 'transform', 'translate3d('+x+','+y+',0)');
    } else if (this.transform2DSupport) {
      this.css(element, 'transform', 'translate('+x+','+y+')');
    } else {
      element.style.left = x;
      element.style.top = y;
    }
  };

  Plugin.prototype.onOrientationTimer = function(event) {
    if (this.orientationSupport && this.orientationStatus === 0) {
      this.disable();
      this.orientationSupport = false;
      this.enable();
    }
  };

  Plugin.prototype.onCalibrationTimer = function(event) {
    this.calibrationFlag = true;
  };

  Plugin.prototype.onWindowResize = function(event) {
    this.updateDimensions();
  };

  Plugin.prototype.onAnimationFrame = function() {
    this.updateBounds();
    var dx = this.ix - this.cx;
    var dy = this.iy - this.cy;
    if ((Math.abs(dx) > this.calibrationThreshold) || (Math.abs(dy) > this.calibrationThreshold)) {
      this.queueCalibration(0);
    }
    if (this.portrait) {
      this.mx = this.calibrateX ? dy : this.iy;
      this.my = this.calibrateY ? dx : this.ix;
    } else {
      this.mx = this.calibrateX ? dx : this.ix;
      this.my = this.calibrateY ? dy : this.iy;
    }
    this.mx *= this.ew * (this.scalarX / 100);
    this.my *= this.eh * (this.scalarY / 100);
    if (!isNaN(parseFloat(this.limitX))) {
      this.mx = this.clamp(this.mx, -this.limitX, this.limitX);
    }
    if (!isNaN(parseFloat(this.limitY))) {
      this.my = this.clamp(this.my, -this.limitY, this.limitY);
    }
    this.vx += (this.mx - this.vx) * this.frictionX;
    this.vy += (this.my - this.vy) * this.frictionY;
    for (var i = 0, l = this.$layers.length; i < l; i++) {
      var depthX = this.depthsX[i];
      var depthY = this.depthsY[i];
      var layer = this.$layers[i];
      var xOffset = this.vx * (depthX * (this.invertX ? -1 : 1));
      var yOffset = this.vy * (depthY * (this.invertY ? -1 : 1));
      this.setPosition(layer, xOffset, yOffset);
    }
    this.raf = requestAnimationFrame(this.onAnimationFrame);
  };

  Plugin.prototype.onDeviceOrientation = function(event) {

    // Validate environment and event properties.
    if (!this.desktop && event.beta !== null && event.gamma !== null) {

      // Set orientation status.
      this.orientationStatus = 1;

      // Extract Rotation
      var x = (event.beta  || 0) / MAGIC_NUMBER; //  -90 :: 90
      var y = (event.gamma || 0) / MAGIC_NUMBER; // -180 :: 180

      // Detect Orientation Change
      var portrait = window.innerHeight > window.innerWidth;
      if (this.portrait !== portrait) {
        this.portrait = portrait;
        this.calibrationFlag = true;
      }

      // Set Calibration
      if (this.calibrationFlag) {
        this.calibrationFlag = false;
        this.cx = x;
        this.cy = y;
      }

      // Set Input
      this.ix = x;
      this.iy = y;
    }
  };

  Plugin.prototype.onMouseMove = function(event) {

    // Cache mouse coordinates.
    var clientX = event.clientX;
    var clientY = event.clientY;

    // Calculate Mouse Input
    if (!this.orientationSupport && this.relativeInput) {

      // Clip mouse coordinates inside element bounds.
      if (this.clipRelativeInput) {
        clientX = Math.max(clientX, this.ex);
        clientX = Math.min(clientX, this.ex + this.ew);
        clientY = Math.max(clientY, this.ey);
        clientY = Math.min(clientY, this.ey + this.eh);
      }

      // Calculate input relative to the element.
      this.ix = (clientX - this.ex - this.ecx) / this.erx;
      this.iy = (clientY - this.ey - this.ecy) / this.ery;

    } else {

      // Calculate input relative to the window.
      this.ix = (clientX - this.wcx) / this.wrx;
      this.iy = (clientY - this.wcy) / this.wry;
    }
  };

  var API = {
    enable: Plugin.prototype.enable,
    disable: Plugin.prototype.disable,
    updateLayers: Plugin.prototype.updateLayers,
    calibrate: Plugin.prototype.calibrate,
    friction: Plugin.prototype.friction,
    invert: Plugin.prototype.invert,
    scalar: Plugin.prototype.scalar,
    limit: Plugin.prototype.limit,
    origin: Plugin.prototype.origin
  };

  $.fn[NAME] = function (value) {
    var args = arguments;
    return this.each(function () {
      var $this = $(this);
      var plugin = $this.data(NAME);
      if (!plugin) {
        plugin = new Plugin(this, value);
        $this.data(NAME, plugin);
      }
      if (API[value]) {
        plugin[value].apply(plugin, Array.prototype.slice.call(args, 1));
      }
    });
  };

})(window.jQuery || window.Zepto, window, document);



$(function() {
    ParallaxScroll.init();
});

var ParallaxScroll = {
    /* PUBLIC VARIABLES */
    showLogs: false,
    round: 1000,

    /* PUBLIC FUNCTIONS */
    init: function() {
        this._log("init");
        if (this._inited) {
            this._log("Already Inited");
            this._inited = true;
            return;
        }
        this._requestAnimationFrame = (function(){
          return  window.requestAnimationFrame       || 
                  window.webkitRequestAnimationFrame || 
                  window.mozRequestAnimationFrame    || 
                  window.oRequestAnimationFrame      || 
                  window.msRequestAnimationFrame     || 
                  function(/* function */ callback, /* DOMElement */ element){
                      window.setTimeout(callback, 1000 / 60);
                  };
        })();
        this._onScroll(true);
    },

    /* PRIVATE VARIABLES */
    _inited: false,
    _properties: ['x', 'y', 'z', 'rotateX', 'rotateY', 'rotateZ', 'scaleX', 'scaleY', 'scaleZ', 'scale'],
    _requestAnimationFrame:null,

    /* PRIVATE FUNCTIONS */
    _log: function(message) {
        if (this.showLogs) console.log("Parallax Scroll / " + message);
    },
    _onScroll: function(noSmooth) {
        var scroll = $(document).scrollTop();
        var windowHeight = $(window).height();
        this._log("onScroll " + scroll);
        $("[data-parallax]").each($.proxy(function(index, el) {
            var $el = $(el);
            var properties = [];
            var applyProperties = false;
            var style = $el.data("style");
            if (style == undefined) {
                style = $el.attr("style") || "";
                $el.data("style", style);
            }
            var datas = [$el.data("parallax")];
            var iData;
            for(iData = 2; ; iData++) {
                if($el.data("parallax"+iData)) {
                    datas.push($el.data("parallax-"+iData));
                }
                else {
                    break;
                }
            }
            var datasLength = datas.length;
            for(iData = 0; iData < datasLength; iData ++) {
                var data = datas[iData];
                var scrollFrom = data["from-scroll"];
                if (scrollFrom == undefined) scrollFrom = Math.max(0, $(el).offset().top - windowHeight);
                scrollFrom = scrollFrom | 0;
                var scrollDistance = data["distance"];
                var scrollTo = data["to-scroll"];
                if (scrollDistance == undefined && scrollTo == undefined) scrollDistance = windowHeight;
                scrollDistance = Math.max(scrollDistance | 0, 1);
                var easing = data["easing"];
                var easingReturn = data["easing-return"];
                if (easing == undefined || !$.easing|| !$.easing[easing]) easing = null;
                if (easingReturn == undefined || !$.easing|| !$.easing[easingReturn]) easingReturn = easing;
                if (easing) {
                    var totalTime = data["duration"];
                    if (totalTime == undefined) totalTime = scrollDistance;
                    totalTime = Math.max(totalTime | 0, 1);
                    var totalTimeReturn = data["duration-return"];
                    if (totalTimeReturn == undefined) totalTimeReturn = totalTime;
                    scrollDistance = 1;
                    var currentTime = $el.data("current-time");
                    if(currentTime == undefined) currentTime = 0;
                }
                if (scrollTo == undefined) scrollTo = scrollFrom + scrollDistance;
                scrollTo = scrollTo | 0;
                var smoothness = data["smoothness"];
                if (smoothness == undefined) smoothness = 10;
                smoothness = smoothness | 0;
                if (noSmooth || smoothness == 0) smoothness = 1;
                smoothness = smoothness | 0;
                var scrollCurrent = scroll;
                scrollCurrent = Math.max(scrollCurrent, scrollFrom);
                scrollCurrent = Math.min(scrollCurrent, scrollTo);
                if(easing) {
                    if($el.data("sens") == undefined) $el.data("sens", "back");
                    if(scrollCurrent>scrollFrom) {
                        if($el.data("sens") == "back") {
                            currentTime = 1;
                            $el.data("sens", "go");
                        }
                        else {
                            currentTime++;
                        }
                    }
                    if(scrollCurrent<scrollTo) {
                        if($el.data("sens") == "go") {
                            currentTime = 1;
                            $el.data("sens", "back");
                        }
                        else {
                            currentTime++;
                        }
                    }
                    if(noSmooth) currentTime = totalTime;
                    $el.data("current-time", currentTime);
                }
                this._properties.map($.proxy(function(prop) {
                    var defaultProp = 0;
                    var to = data[prop];
                    if (to == undefined) return;
                    if(prop=="scale" || prop=="scaleX" || prop=="scaleY" || prop=="scaleZ" ) {
                        defaultProp = 1;
                    }
                    else {
                        to = to | 0;
                    }
                    var prev = $el.data("_" + prop);
                    if (prev == undefined) prev = defaultProp;
                    var next = ((to-defaultProp) * ((scrollCurrent - scrollFrom) / (scrollTo - scrollFrom))) + defaultProp;
                    var val = prev + (next - prev) / smoothness;
                    if(easing && currentTime>0 && currentTime<=totalTime) {
                        var from = defaultProp;
                        if($el.data("sens") == "back") {
                            from = to;
                            to = -to;
                            easing = easingReturn;
                            totalTime = totalTimeReturn;
                        }
                        val = $.easing[easing](null, currentTime, from, to, totalTime);
                    }
                    val = Math.ceil(val * this.round) / this.round;
                    if(val==prev&&next==to) val = to;
                    if(!properties[prop]) properties[prop] = 0;
                    properties[prop] += val;
                    if (prev != properties[prop]) {
                        $el.data("_" + prop, properties[prop]);
                        applyProperties = true;
                    }
                }, this));
            }
            if (applyProperties) {
                if (properties["z"] != undefined) {
                    var perspective = data["perspective"];
                    if (perspective == undefined) perspective = 800;
                    var $parent = $el.parent();
                    if(!$parent.data("style")) $parent.data("style", $parent.attr("style") || "");
                    $parent.attr("style", "perspective:" + perspective + "px; -webkit-perspective:" + perspective + "px; "+ $parent.data("style"));
                }
                if(properties["scaleX"] == undefined) properties["scaleX"] = 1;
                if(properties["scaleY"] == undefined) properties["scaleY"] = 1;
                if(properties["scaleZ"] == undefined) properties["scaleZ"] = 1;
                if (properties["scale"] != undefined) {
                    properties["scaleX"] *= properties["scale"];
                    properties["scaleY"] *= properties["scale"];
                    properties["scaleZ"] *= properties["scale"];
                }
                var translate3d = "translate3d(" + (properties["x"] ? properties["x"] : 0) + "px, " + (properties["y"] ? properties["y"] : 0) + "px, " + (properties["z"] ? properties["z"] : 0) + "px)";
                var rotate3d = "rotateX(" + (properties["rotateX"] ? properties["rotateX"] : 0) + "deg) rotateY(" + (properties["rotateY"] ? properties["rotateY"] : 0) + "deg) rotateZ(" + (properties["rotateZ"] ? properties["rotateZ"] : 0) + "deg)";
                var scale3d = "scaleX(" + properties["scaleX"] + ") scaleY(" + properties["scaleY"] + ") scaleZ(" + properties["scaleZ"] + ")";
                var cssTransform = translate3d + " " + rotate3d + " " + scale3d + ";";
                this._log(cssTransform);
                $el.attr("style", "transform:" + cssTransform + " -webkit-transform:" + cssTransform + " " + style);
            }
        }, this));
        if(window.requestAnimationFrame) {
            window.requestAnimationFrame($.proxy(this._onScroll, this, false));
        }
        else {
            this._requestAnimationFrame($.proxy(this._onScroll, this, false));
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    }
};