/*! responsive-nav.js 1.0.25
 * https://github.com/viljamis/responsive-nav.js
 * http://responsive-nav.com
 *
 * Copyright (c) 2013 @viljamis
 * Available under the MIT license
 */

(function () {

  "use strict";

  /* exported responsiveNav */
  var responsiveNav = function (el, options) {
  
    var computed = !!window.getComputedStyle;
    
    // getComputedStyle polyfill
    if (!computed) {
      window.getComputedStyle = function(el) {
        this.el = el;
        this.getPropertyValue = function(prop) {
          var re = /(\-([a-z]){1})/g;
          if (prop === "float") {
            prop = "styleFloat";
          }
          if (re.test(prop)) {
            prop = prop.replace(re, function () {
              return arguments[2].toUpperCase();
            });
          }
          return el.currentStyle[prop] ? el.currentStyle[prop] : null;
        };
        return this;
      };
    }
    /* exported addEvent, removeEvent, getChildren, setAttributes, addClass, removeClass */
    // fn arg can be an object or a function, thanks to handleEvent
    // read more at: http://www.thecssninja.com/javascript/handleevent
    var addEvent = function (el, evt, fn, bubble) {
        if ("addEventListener" in el) {
          // BBOS6 doesn't support handleEvent, catch and polyfill
          try {
            el.addEventListener(evt, fn, bubble);
          } catch (e) {
            if (typeof fn === "object" && fn.handleEvent) {
              el.addEventListener(evt, function (e) {
                // Bind fn as this and set first arg as event object
                fn.handleEvent.call(fn, e);
              }, bubble);
            } else {
              throw e;
            }
          }
        } else if ("attachEvent" in el) {
          // check if the callback is an object and contains handleEvent
          if (typeof fn === "object" && fn.handleEvent) {
            el.attachEvent("on" + evt, function () {
              // Bind fn as this
              fn.handleEvent.call(fn);
            });
          } else {
            el.attachEvent("on" + evt, fn);
          }
        }
      },
    
      removeEvent = function (el, evt, fn, bubble) {
        if ("removeEventListener" in el) {
          try {
            el.removeEventListener(evt, fn, bubble);
          } catch (e) {
            if (typeof fn === "object" && fn.handleEvent) {
              el.removeEventListener(evt, function (e) {
                fn.handleEvent.call(fn, e);
              }, bubble);
            } else {
              throw e;
            }
          }
        } else if ("detachEvent" in el) {
          if (typeof fn === "object" && fn.handleEvent) {
            el.detachEvent("on" + evt, function () {
              fn.handleEvent.call(fn);
            });
          } else {
            el.detachEvent("on" + evt, fn);
          }
        }
      },
    
      getChildren = function (e) {
        if (e.children.length < 1) {
          throw new Error("The Nav container has no containing elements");
        }
        // Store all children in array
        var children = [];
        // Loop through children and store in array if child != TextNode
        for (var i = 0; i < e.children.length; i++) {
          if (e.children[i].nodeType === 1) {
            children.push(e.children[i]);
          }
        }
        return children;
      },
    
      setAttributes = function (el, attrs) {
        for (var key in attrs) {
          el.setAttribute(key, attrs[key]);
        }
      },
    
      addClass = function (el, cls) {
        if (el.className.indexOf(cls) !== 0) {
          el.className += " " + cls;
          el.className = el.className.replace(/(^\s*)|(\s*$)/g,"");
        }
      },
    
      removeClass = function (el, cls) {
        var reg = new RegExp("(\\s|^)" + cls + "(\\s|$)");
        el.className = el.className.replace(reg, " ").replace(/(^\s*)|(\s*$)/g,"");
      };
  
    var nav,
      opts,
      navToggle,
      styleElement = document.createElement("style"),
      hasAnimFinished,
      navOpen;
  
    var ResponsiveNav = function (el, options) {
        var i;
  
        // Default options
        this.options = {
          animate: true,             // Boolean: Use CSS3 transitions, true or false
          transition: 250,           // Integer: Speed of the transition, in milliseconds
          label: "Menu",             // String: Label for the navigation toggle
          insert: "after",           // String: Insert the toggle before or after the navigation
          customToggle: "",          // Selector: Specify the ID of a custom toggle
          openPos: "relative",       // String: Position of the opened nav, relative or static
          navClass: "nav-collapse",  // String: Default CSS class. If changed, you need to edit the CSS too!
          jsClass: "js",             // String: 'JS enabled' class which is added to <html> element
          init: function(){},        // Function: Init callback
          open: function(){},        // Function: Open callback
          close: function(){}        // Function: Close callback
        };
  
        // User defined options
        for (i in options) {
          this.options[i] = options[i];
        }
  
        // Adds "js" class for <html>
        addClass(document.documentElement, this.options.jsClass);
  
        // Wrapper
        this.wrapperEl = el.replace("#", "");
        if (document.getElementById(this.wrapperEl)) {
          this.wrapper = document.getElementById(this.wrapperEl);
        } else if (document.querySelector(this.wrapperEl)) {
          this.wrapper = document.querySelector(this.wrapperEl);
        } else {
          // If el doesn't exists, stop here.
          throw new Error("The nav element you are trying to select doesn't exist");
        }
  
        // Inner wrapper
        this.wrapper.inner = getChildren(this.wrapper);
  
        // For minification
        opts = this.options;
        nav = this.wrapper;
  
        // Init
        this._init(this);
      };
  
    ResponsiveNav.prototype = {
  
      // Public methods
      destroy: function () {
        this._removeStyles();
        removeClass(nav, "closed");
        removeClass(nav, "opened");
        removeClass(nav, opts.navClass);
        nav.removeAttribute("style");
        nav.removeAttribute("aria-hidden");
  
        removeEvent(window, "resize", this, false);
        removeEvent(document.body, "touchmove", this, false);
        removeEvent(navToggle, "touchstart", this, false);
        removeEvent(navToggle, "touchend", this, false);
        removeEvent(navToggle, "mouseup", this, false);
        removeEvent(navToggle, "keyup", this, false);
        removeEvent(navToggle, "click", this, false);
  
        if (!opts.customToggle) {
          navToggle.parentNode.removeChild(navToggle);
        } else {
          navToggle.removeAttribute("aria-hidden");
        }
      },
  
      toggle: function () {
        if (hasAnimFinished === true) {
          if (!navOpen) {
            removeClass(nav, "closed");
            addClass(nav, "opened");
            nav.style.position = opts.openPos;
            setAttributes(nav, {"aria-hidden": "false"});
  
            navOpen = true;
            opts.open();
          } else {
            removeClass(nav, "opened");
            addClass(nav, "closed");
            setAttributes(nav, {"aria-hidden": "true"});
  
            if (opts.animate) {
              hasAnimFinished = false;
              setTimeout(function () {
                nav.style.position = "absolute";
                hasAnimFinished = true;
              }, opts.transition + 10);
            } else {
              nav.style.position = "absolute";
            }
  
            navOpen = false;
            opts.close();
          }
        }
      },
  
      resize: function () {
        if (window.getComputedStyle(navToggle, null).getPropertyValue("display") !== "none") {
          setAttributes(navToggle, {"aria-hidden": "false"});
  
          // If the navigation is hidden
          if (nav.className.match(/(^|\s)closed(\s|$)/)) {
            setAttributes(nav, {"aria-hidden": "true"});
            nav.style.position = "absolute";
          }
  
          this._createStyles();
          this._calcHeight();
        } else {
          setAttributes(navToggle, {"aria-hidden": "true"});
          setAttributes(nav, {"aria-hidden": "false"});
          nav.style.position = opts.openPos;
          this._removeStyles();
        }
      },
  
      handleEvent: function (e) {
        var evt = e || window.event;
  
        switch (evt.type) {
        case "touchstart":
          this._onTouchStart(evt);
          break;
        case "touchmove":
          this._onTouchMove(evt);
          break;
        case "touchend":
        case "mouseup":
          this._onTouchEnd(evt);
          break;
        case "click":
          this._preventDefault(evt);
          break;
        case "keyup":
          this._onKeyUp(evt);
          break;
        case "resize":
          this.resize(evt);
          break;
        }
      },
  
      // Private methods
      _init: function () {
        addClass(nav, opts.navClass);
        addClass(nav, "closed");
        hasAnimFinished = true;
        navOpen = false;
  
        this._createToggle();
        this._transitions();
        this.resize();
  
        // IE8 hack
        var self = this;
        setTimeout(function () {
          self.resize();
        }, 20);
  
        addEvent(window, "resize", this, false);
        addEvent(document.body, "touchmove", this, false);
        addEvent(navToggle, "touchstart", this, false);
        addEvent(navToggle, "touchend", this, false);
        addEvent(navToggle, "mouseup", this, false);
        addEvent(navToggle, "keyup", this, false);
        addEvent(navToggle, "click", this, false);
  
        // Init callback
        opts.init();
      },
  
      _createStyles: function () {
        if (!styleElement.parentNode) {
          styleElement.type = "text/css";
          document.getElementsByTagName("head")[0].appendChild(styleElement);
        }
      },
  
      _removeStyles: function () {
        if (styleElement.parentNode) {
          styleElement.parentNode.removeChild(styleElement);
        }
      },
  
      _createToggle: function () {
        if (!opts.customToggle) {
          var toggle = document.createElement("a");
          toggle.innerHTML = opts.label;
          setAttributes(toggle, {
            "href": "#",
            "class": "nav-toggle"
          });
  
          if (opts.insert === "after") {
            nav.parentNode.insertBefore(toggle, nav.nextSibling);
          } else {
            nav.parentNode.insertBefore(toggle, nav);
          }
  
          navToggle = toggle;
        } else {
          var toggleEl = opts.customToggle.replace("#", "");
  
          if (document.getElementById(toggleEl)) {
            navToggle = document.getElementById(toggleEl);
          } else if (document.querySelector(toggleEl)) {
            navToggle = document.querySelector(toggleEl);
          } else {
            throw new Error("The custom nav toggle you are trying to select doesn't exist");
          }
        }
      },
  
      _preventDefault: function(e) {
        if (e.preventDefault) {
          e.preventDefault();
          e.stopPropagation();
        } else {
          e.returnValue = false;
        }
      },
  
      _onTouchStart: function (e) {
        e.stopPropagation();
        addClass(nav, "disable-pointer-events");
        this.startX = e.touches[0].clientX;
        this.startY = e.touches[0].clientY;
        this.touchHasMoved = false;
        removeEvent(navToggle, "mouseup", this, false);
      },
  
      _onTouchMove: function (e) {
        if (Math.abs(e.touches[0].clientX - this.startX) > 10 ||
        Math.abs(e.touches[0].clientY - this.startY) > 10) {
          this.touchHasMoved = true;
        }
      },
  
      _onTouchEnd: function (e) {
        this._preventDefault(e);
        if (!this.touchHasMoved) {
          if (e.type === "touchend") {
            this.toggle(e);
            setTimeout(function () {
              removeClass(nav, "disable-pointer-events");
            }, opts.transition + 300);
            return;
          } else {
            var evt = e || window.event;
            // If it isn't a right click
            if (!(evt.which === 3 || evt.button === 2)) {
              this.toggle(e);
            }
          }
        }
      },
  
      _onKeyUp: function (e) {
        var evt = e || window.event;
        if (evt.keyCode === 13) {
          this.toggle(e);
        }
      },
  
      _transitions: function () {
        if (opts.animate) {
          var objStyle = nav.style,
            transition = "max-height " + opts.transition + "ms";
  
          objStyle.WebkitTransition = transition;
          objStyle.MozTransition = transition;
          objStyle.OTransition = transition;
          objStyle.transition = transition;
        }
      },
  
      _calcHeight: function () {
        var savedHeight = 0;
        for (var i = 0; i < nav.inner.length; i++) {
          savedHeight += nav.inner[i].offsetHeight;
        }
        var innerStyles = "." + opts.navClass + ".opened{max-height:" + savedHeight + "px !important}";
  
        if (styleElement.styleSheet) {
          styleElement.styleSheet.cssText = innerStyles;
        } else {
          styleElement.innerHTML = innerStyles;
        }
  
        innerStyles = "";
      }
  
    };
  
    return new ResponsiveNav(el, options);
  
  };

  window.responsiveNav = responsiveNav;

}());