(function ($) {

  var focused = true;

  //flexslider: object instance
  $.flexslider = function(el, options) {
    var slider = $(el);

    // making variables public
    slider.vars = $.extend({}, $.flexslider.defaults, options);

    var namespace = slider.vars.namespace,
        msgesture = window.navigator && window.navigator.mspointerenabled && window.msgesture,
        touch = (( "ontouchstart" in window ) || msgesture || window.documenttouch && document instanceof documenttouch) && slider.vars.touch,
        // depricating this idea, as devices are being released with both of these events
        eventtype = "click touchend mspointerup keyup",
        watchedevent = "",
        watchedeventcleartimer,
        vertical = slider.vars.direction === "vertical",
        reverse = slider.vars.reverse,
        carousel = (slider.vars.itemwidth > 0),
        fade = slider.vars.animation === "fade",
        asnav = slider.vars.asnavfor !== "",
        methods = {};

    // store a reference to the slider object
    $.data(el, "flexslider", slider);

    // private slider methods
    methods = {
      init: function() {
        slider.animating = false;
        // get current slide and make sure it is a number
        slider.currentslide = parseint( ( slider.vars.startat ? slider.vars.startat : 0), 10 );
        if ( isnan( slider.currentslide ) ) { slider.currentslide = 0; }
        slider.animatingto = slider.currentslide;
        slider.atend = (slider.currentslide === 0 || slider.currentslide === slider.last);
        slider.containerselector = slider.vars.selector.substr(0,slider.vars.selector.search(' '));
        slider.slides = $(slider.vars.selector, slider);
        slider.container = $(slider.containerselector, slider);
        slider.count = slider.slides.length;
        // sync:
        slider.syncexists = $(slider.vars.sync).length > 0;
        // slide:
        if (slider.vars.animation === "slide") { slider.vars.animation = "swing"; }
        slider.prop = (vertical) ? "top" : "marginleft";
        slider.args = {};
        // slideshow:
        slider.manualpause = false;
        slider.stopped = false;
        //pause when invisible
        slider.started = false;
        slider.starttimeout = null;
        // touch/usecss:
        slider.transitions = !slider.vars.video && !fade && slider.vars.usecss && (function() {
          var obj = document.createelement('div'),
              props = ['perspectiveproperty', 'webkitperspective', 'mozperspective', 'operspective', 'msperspective'];
          for (var i in props) {
            if ( obj.style[ props[i] ] !== undefined ) {
              slider.pfx = props[i].replace('perspective','').tolowercase();
              slider.prop = "-" + slider.pfx + "-transform";
              return true;
            }
          }
          return false;
        }());
        slider.ensureanimationend = '';
        // controlscontainer:
        if (slider.vars.controlscontainer !== "") slider.controlscontainer = $(slider.vars.controlscontainer).length > 0 && $(slider.vars.controlscontainer);
        // manual:
        if (slider.vars.manualcontrols !== "") slider.manualcontrols = $(slider.vars.manualcontrols).length > 0 && $(slider.vars.manualcontrols);

        // custom direction nav:
        if (slider.vars.customdirectionnav !== "") slider.customdirectionnav = $(slider.vars.customdirectionnav).length === 2 && $(slider.vars.customdirectionnav);

        // randomize:
        if (slider.vars.randomize) {
          slider.slides.sort(function() { return (math.round(math.random())-0.5); });
          slider.container.empty().append(slider.slides);
        }

        slider.domath();

        // init
        slider.setup("init");

        // controlnav:
        if (slider.vars.controlnav) { methods.controlnav.setup(); }

        // directionnav:
        if (slider.vars.directionnav) { methods.directionnav.setup(); }

        // keyboard:
        if (slider.vars.keyboard && ($(slider.containerselector).length === 1 || slider.vars.multiplekeyboard)) {
          $(document).bind('keyup', function(event) {
            var keycode = event.keycode;
            if (!slider.animating && (keycode === 39 || keycode === 37)) {
              var target = (keycode === 39) ? slider.gettarget('next') :
                           (keycode === 37) ? slider.gettarget('prev') : false;
              slider.flexanimate(target, slider.vars.pauseonaction);
            }
          });
        }
        // mousewheel:
        if (slider.vars.mousewheel) {
          slider.bind('mousewheel', function(event, delta, deltax, deltay) {
            event.preventdefault();
            var target = (delta < 0) ? slider.gettarget('next') : slider.gettarget('prev');
            slider.flexanimate(target, slider.vars.pauseonaction);
          });
        }

        // pauseplay
        if (slider.vars.pauseplay) { methods.pauseplay.setup(); }

        //pause when invisible
        if (slider.vars.slideshow && slider.vars.pauseinvisible) { methods.pauseinvisible.init(); }

        // slidseshow
        if (slider.vars.slideshow) {
          if (slider.vars.pauseonhover) {
            slider.hover(function() {
              if (!slider.manualplay && !slider.manualpause) { slider.pause(); }
            }, function() {
              if (!slider.manualpause && !slider.manualplay && !slider.stopped) { slider.play(); }
            });
          }
          // initialize animation
          //if we're visible, or we don't use pagevisibility api
          if(!slider.vars.pauseinvisible || !methods.pauseinvisible.ishidden()) {
            (slider.vars.initdelay > 0) ? slider.starttimeout = settimeout(slider.play, slider.vars.initdelay) : slider.play();
          }
        }

        // asnav:
        if (asnav) { methods.asnav.setup(); }

        // touch
        if (touch && slider.vars.touch) { methods.touch(); }

        // fade&&smoothheight || slide:
        if (!fade || (fade && slider.vars.smoothheight)) { $(window).bind("resize orientationchange focus", methods.resize); }

        slider.find("img").attr("draggable", "false");

        // api: start() callback
        settimeout(function(){
          slider.vars.start(slider);
        }, 200);
      },
      asnav: {
        setup: function() {
          slider.asnav = true;
          slider.animatingto = math.floor(slider.currentslide/slider.move);
          slider.currentitem = slider.currentslide;
          slider.slides.removeclass(namespace + "active-slide").eq(slider.currentitem).addclass(namespace + "active-slide");
          if(!msgesture){
              slider.slides.on(eventtype, function(e){
                e.preventdefault();
                var $slide = $(this),
                    target = $slide.index();
                var posfromleft = $slide.offset().left - $(slider).scrollleft(); // find position of slide relative to left of slider container
                if( posfromleft <= 0 && $slide.hasclass( namespace + 'active-slide' ) ) {
                  slider.flexanimate(slider.gettarget("prev"), true);
                } else if (!$(slider.vars.asnavfor).data('flexslider').animating && !$slide.hasclass(namespace + "active-slide")) {
                  slider.direction = (slider.currentitem < target) ? "next" : "prev";
                  slider.flexanimate(target, slider.vars.pauseonaction, false, true, true);
                }
              });
          }else{
              el._slider = slider;
              slider.slides.each(function (){
                  var that = this;
                  that._gesture = new msgesture();
                  that._gesture.target = that;
                  that.addeventlistener("mspointerdown", function (e){
                      e.preventdefault();
                      if(e.currenttarget._gesture) {
                        e.currenttarget._gesture.addpointer(e.pointerid);
                      }
                  }, false);
                  that.addeventlistener("msgesturetap", function (e){
                      e.preventdefault();
                      var $slide = $(this),
                          target = $slide.index();
                      if (!$(slider.vars.asnavfor).data('flexslider').animating && !$slide.hasclass('active')) {
                          slider.direction = (slider.currentitem < target) ? "next" : "prev";
                          slider.flexanimate(target, slider.vars.pauseonaction, false, true, true);
                      }
                  });
              });
          }
        }
      },
      controlnav: {
        setup: function() {
          if (!slider.manualcontrols) {
            methods.controlnav.setuppaging();
          } else { // manualcontrols:
            methods.controlnav.setupmanual();
          }
        },
        setuppaging: function() {
          var type = (slider.vars.controlnav === "thumbnails") ? 'control-thumbs' : 'control-paging',
              j = 1,
              item,
              slide;

          slider.controlnavscaffold = $('<ol class="'+ namespace + 'control-nav ' + namespace + type + '"></ol>');

          if (slider.pagingcount > 1) {
            for (var i = 0; i < slider.pagingcount; i++) {
              slide = slider.slides.eq(i);
              if ( undefined === slide.attr( 'data-thumb-alt' ) ) { slide.attr( 'data-thumb-alt', '' ); }
              alttext = ( '' !== slide.attr( 'data-thumb-alt' ) ) ? alttext = ' alt="' + slide.attr( 'data-thumb-alt' ) + '"' : '';
              item = (slider.vars.controlnav === "thumbnails") ? '<img src="' + slide.attr( 'data-thumb' ) + '"' + alttext + '/>' : '<a href="#"><span>' + j + '</span></a>';
              if ( 'thumbnails' === slider.vars.controlnav && true === slider.vars.thumbcaptions ) {
                var captn = slide.attr( 'data-thumbcaption' );
                if ( '' !== captn && undefined !== captn ) { item += '<span class="' + namespace + 'caption">' + captn + '</span>'; }
              }
              slider.controlnavscaffold.append('<li>' + item + '</li>');
              j++;
            }
          }

          // controlscontainer:
          (slider.controlscontainer) ? $(slider.controlscontainer).append(slider.controlnavscaffold) : slider.append(slider.controlnavscaffold);
          methods.controlnav.set();

          methods.controlnav.active();

          slider.controlnavscaffold.delegate('a, img', eventtype, function(event) {
            event.preventdefault();

            if (watchedevent === "" || watchedevent === event.type) {
              var $this = $(this),
                  target = slider.controlnav.index($this);

              if (!$this.hasclass(namespace + 'active')) {
                slider.direction = (target > slider.currentslide) ? "next" : "prev";
                slider.flexanimate(target, slider.vars.pauseonaction);
              }
            }

            // setup flags to prevent event duplication
            if (watchedevent === "") {
              watchedevent = event.type;
            }
            methods.settoclearwatchedevent();

          });
        },
        setupmanual: function() {
          slider.controlnav = slider.manualcontrols;
          methods.controlnav.active();

          slider.controlnav.bind(eventtype, function(event) {
            event.preventdefault();

            if (watchedevent === "" || watchedevent === event.type) {
              var $this = $(this),
                  target = slider.controlnav.index($this);

              if (!$this.hasclass(namespace + 'active')) {
                (target > slider.currentslide) ? slider.direction = "next" : slider.direction = "prev";
                slider.flexanimate(target, slider.vars.pauseonaction);
              }
            }

            // setup flags to prevent event duplication
            if (watchedevent === "") {
              watchedevent = event.type;
            }
            methods.settoclearwatchedevent();
          });
        },
        set: function() {
          var selector = (slider.vars.controlnav === "thumbnails") ? 'img' : 'a';
          slider.controlnav = $('.' + namespace + 'control-nav li ' + selector, (slider.controlscontainer) ? slider.controlscontainer : slider);
        },
        active: function() {
          slider.controlnav.removeclass(namespace + "active").eq(slider.animatingto).addclass(namespace + "active");
        },
        update: function(action, pos) {
          if (slider.pagingcount > 1 && action === "add") {
            slider.controlnavscaffold.append($('<li><a href="#">' + slider.count + '</a></li>'));
          } else if (slider.pagingcount === 1) {
            slider.controlnavscaffold.find('li').remove();
          } else {
            slider.controlnav.eq(pos).closest('li').remove();
          }
          methods.controlnav.set();
          (slider.pagingcount > 1 && slider.pagingcount !== slider.controlnav.length) ? slider.update(pos, action) : methods.controlnav.active();
        }
      },
      directionnav: {
        setup: function() {
          var directionnavscaffold = $('<ul class="' + namespace + 'direction-nav"><li class="' + namespace + 'nav-prev"><a class="' + namespace + 'prev" href="#">' + slider.vars.prevtext + '</a></li><li class="' + namespace + 'nav-next"><a class="' + namespace + 'next" href="#">' + slider.vars.nexttext + '</a></li></ul>');

          // custom direction nav:
          if (slider.customdirectionnav) {
            slider.directionnav = slider.customdirectionnav;
          // controlscontainer:
          } else if (slider.controlscontainer) {
            $(slider.controlscontainer).append(directionnavscaffold);
            slider.directionnav = $('.' + namespace + 'direction-nav li a', slider.controlscontainer);
          } else {
            slider.append(directionnavscaffold);
            slider.directionnav = $('.' + namespace + 'direction-nav li a', slider);
          }

          methods.directionnav.update();

          slider.directionnav.bind(eventtype, function(event) {
            event.preventdefault();
            var target;

            if (watchedevent === "" || watchedevent === event.type) {
              target = ($(this).hasclass(namespace + 'next')) ? slider.gettarget('next') : slider.gettarget('prev');
              slider.flexanimate(target, slider.vars.pauseonaction);
            }

            // setup flags to prevent event duplication
            if (watchedevent === "") {
              watchedevent = event.type;
            }
            methods.settoclearwatchedevent();
          });
        },
        update: function() {
          var disabledclass = namespace + 'disabled';
          if (slider.pagingcount === 1) {
            slider.directionnav.addclass(disabledclass).attr('tabindex', '-1');
          } else if (!slider.vars.animationloop) {
            if (slider.animatingto === 0) {
              slider.directionnav.removeclass(disabledclass).filter('.' + namespace + "prev").addclass(disabledclass).attr('tabindex', '-1');
            } else if (slider.animatingto === slider.last) {
              slider.directionnav.removeclass(disabledclass).filter('.' + namespace + "next").addclass(disabledclass).attr('tabindex', '-1');
            } else {
              slider.directionnav.removeclass(disabledclass).removeattr('tabindex');
            }
          } else {
            slider.directionnav.removeclass(disabledclass).removeattr('tabindex');
          }
        }
      },
      pauseplay: {
        setup: function() {
          var pauseplayscaffold = $('<div class="' + namespace + 'pauseplay"><a href="#"></a></div>');

          // controlscontainer:
          if (slider.controlscontainer) {
            slider.controlscontainer.append(pauseplayscaffold);
            slider.pauseplay = $('.' + namespace + 'pauseplay a', slider.controlscontainer);
          } else {
            slider.append(pauseplayscaffold);
            slider.pauseplay = $('.' + namespace + 'pauseplay a', slider);
          }

          methods.pauseplay.update((slider.vars.slideshow) ? namespace + 'pause' : namespace + 'play');

          slider.pauseplay.bind(eventtype, function(event) {
            event.preventdefault();

            if (watchedevent === "" || watchedevent === event.type) {
              if ($(this).hasclass(namespace + 'pause')) {
                slider.manualpause = true;
                slider.manualplay = false;
                slider.pause();
              } else {
                slider.manualpause = false;
                slider.manualplay = true;
                slider.play();
              }
            }

            // setup flags to prevent event duplication
            if (watchedevent === "") {
              watchedevent = event.type;
            }
            methods.settoclearwatchedevent();
          });
        },
        update: function(state) {
          (state === "play") ? slider.pauseplay.removeclass(namespace + 'pause').addclass(namespace + 'play').html(slider.vars.playtext) : slider.pauseplay.removeclass(namespace + 'play').addclass(namespace + 'pause').html(slider.vars.pausetext);
        }
      },
      touch: function() {
        var startx,
          starty,
          offset,
          cwidth,
          dx,
          startt,
          ontouchstart,
          ontouchmove,
          ontouchend,
          scrolling = false,
          localx = 0,
          localy = 0,
          accdx = 0;

        if(!msgesture){
            ontouchstart = function(e) {
              if (slider.animating) {
                e.preventdefault();
              } else if ( ( window.navigator.mspointerenabled ) || e.touches.length === 1 ) {
                slider.pause();
                // carousel:
                cwidth = (vertical) ? slider.h : slider. w;
                startt = number(new date());
                // carousel:

                // local vars for x and y points.
                localx = e.touches[0].pagex;
                localy = e.touches[0].pagey;

                offset = (carousel && reverse && slider.animatingto === slider.last) ? 0 :
                         (carousel && reverse) ? slider.limit - (((slider.itemw + slider.vars.itemmargin) * slider.move) * slider.animatingto) :
                         (carousel && slider.currentslide === slider.last) ? slider.limit :
                         (carousel) ? ((slider.itemw + slider.vars.itemmargin) * slider.move) * slider.currentslide :
                         (reverse) ? (slider.last - slider.currentslide + slider.cloneoffset) * cwidth : (slider.currentslide + slider.cloneoffset) * cwidth;
                startx = (vertical) ? localy : localx;
                starty = (vertical) ? localx : localy;

                el.addeventlistener('touchmove', ontouchmove, false);
                el.addeventlistener('touchend', ontouchend, false);
              }
            };

            ontouchmove = function(e) {
              // local vars for x and y points.

              localx = e.touches[0].pagex;
              localy = e.touches[0].pagey;

              dx = (vertical) ? startx - localy : startx - localx;
              scrolling = (vertical) ? (math.abs(dx) < math.abs(localx - starty)) : (math.abs(dx) < math.abs(localy - starty));

              var fxms = 500;

              if ( ! scrolling || number( new date() ) - startt > fxms ) {
                e.preventdefault();
                if (!fade && slider.transitions) {
                  if (!slider.vars.animationloop) {
                    dx = dx/((slider.currentslide === 0 && dx < 0 || slider.currentslide === slider.last && dx > 0) ? (math.abs(dx)/cwidth+2) : 1);
                  }
                  slider.setprops(offset + dx, "settouch");
                }
              }
            };

            ontouchend = function(e) {
              // finish the touch by undoing the touch session
              el.removeeventlistener('touchmove', ontouchmove, false);

              if (slider.animatingto === slider.currentslide && !scrolling && !(dx === null)) {
                var updatedx = (reverse) ? -dx : dx,
                    target = (updatedx > 0) ? slider.gettarget('next') : slider.gettarget('prev');

                if (slider.canadvance(target) && (number(new date()) - startt < 550 && math.abs(updatedx) > 50 || math.abs(updatedx) > cwidth/2)) {
                  slider.flexanimate(target, slider.vars.pauseonaction);
                } else {
                  if (!fade) { slider.flexanimate(slider.currentslide, slider.vars.pauseonaction, true); }
                }
              }
              el.removeeventlistener('touchend', ontouchend, false);

              startx = null;
              starty = null;
              dx = null;
              offset = null;
            };

            el.addeventlistener('touchstart', ontouchstart, false);
        }else{
            el.style.mstouchaction = "none";
            el._gesture = new msgesture();
            el._gesture.target = el;
            el.addeventlistener("mspointerdown", onmspointerdown, false);
            el._slider = slider;
            el.addeventlistener("msgesturechange", onmsgesturechange, false);
            el.addeventlistener("msgestureend", onmsgestureend, false);

            function onmspointerdown(e){
                e.stoppropagation();
                if (slider.animating) {
                    e.preventdefault();
                }else{
                    slider.pause();
                    el._gesture.addpointer(e.pointerid);
                    accdx = 0;
                    cwidth = (vertical) ? slider.h : slider. w;
                    startt = number(new date());
                    // carousel:

                    offset = (carousel && reverse && slider.animatingto === slider.last) ? 0 :
                        (carousel && reverse) ? slider.limit - (((slider.itemw + slider.vars.itemmargin) * slider.move) * slider.animatingto) :
                            (carousel && slider.currentslide === slider.last) ? slider.limit :
                                (carousel) ? ((slider.itemw + slider.vars.itemmargin) * slider.move) * slider.currentslide :
                                    (reverse) ? (slider.last - slider.currentslide + slider.cloneoffset) * cwidth : (slider.currentslide + slider.cloneoffset) * cwidth;
                }
            }

            function onmsgesturechange(e) {
                e.stoppropagation();
                var slider = e.target._slider;
                if(!slider){
                    return;
                }
                var transx = -e.translationx,
                    transy = -e.translationy;

                //accumulate translations.
                accdx = accdx + ((vertical) ? transy : transx);
                dx = accdx;
                scrolling = (vertical) ? (math.abs(accdx) < math.abs(-transx)) : (math.abs(accdx) < math.abs(-transy));

                if(e.detail === e.msgesture_flag_inertia){
                    setimmediate(function (){
                        el._gesture.stop();
                    });

                    return;
                }

                if (!scrolling || number(new date()) - startt > 500) {
                    e.preventdefault();
                    if (!fade && slider.transitions) {
                        if (!slider.vars.animationloop) {
                            dx = accdx / ((slider.currentslide === 0 && accdx < 0 || slider.currentslide === slider.last && accdx > 0) ? (math.abs(accdx) / cwidth + 2) : 1);
                        }
                        slider.setprops(offset + dx, "settouch");
                    }
                }
            }

            function onmsgestureend(e) {
                e.stoppropagation();
                var slider = e.target._slider;
                if(!slider){
                    return;
                }
                if (slider.animatingto === slider.currentslide && !scrolling && !(dx === null)) {
                    var updatedx = (reverse) ? -dx : dx,
                        target = (updatedx > 0) ? slider.gettarget('next') : slider.gettarget('prev');

                    if (slider.canadvance(target) && (number(new date()) - startt < 550 && math.abs(updatedx) > 50 || math.abs(updatedx) > cwidth/2)) {
                        slider.flexanimate(target, slider.vars.pauseonaction);
                    } else {
                        if (!fade) { slider.flexanimate(slider.currentslide, slider.vars.pauseonaction, true); }
                    }
                }

                startx = null;
                starty = null;
                dx = null;
                offset = null;
                accdx = 0;
            }
        }
      },
      resize: function() {
        if (!slider.animating && slider.is(':visible')) {
          if (!carousel) { slider.domath(); }

          if (fade) {
            // smooth height:
            methods.smoothheight();
          } else if (carousel) { //carousel:
            slider.slides.width(slider.computedw);
            slider.update(slider.pagingcount);
            slider.setprops();
          }
          else if (vertical) { //vertical:
            slider.viewport.height(slider.h);
            slider.setprops(slider.h, "settotal");
          } else {
            // smooth height:
            if (slider.vars.smoothheight) { methods.smoothheight(); }
            slider.newslides.width(slider.computedw);
            slider.setprops(slider.computedw, "settotal");
          }
        }
      },
      smoothheight: function(dur) {
        if (!vertical || fade) {
          var $obj = (fade) ? slider : slider.viewport;
          (dur) ? $obj.animate({"height": slider.slides.eq(slider.animatingto).height()}, dur) : $obj.height(slider.slides.eq(slider.animatingto).height());
        }
      },
      sync: function(action) {
        var $obj = $(slider.vars.sync).data("flexslider"),
            target = slider.animatingto;

        switch (action) {
          case "animate": $obj.flexanimate(target, slider.vars.pauseonaction, false, true); break;
          case "play": if (!$obj.playing && !$obj.asnav) { $obj.play(); } break;
          case "pause": $obj.pause(); break;
        }
      },
      uniqueid: function($clone) {
        // append _clone to current level and children elements with id attributes
        $clone.filter( '[id]' ).add($clone.find( '[id]' )).each(function() {
          var $this = $(this);
          $this.attr( 'id', $this.attr( 'id' ) + '_clone' );
        });
        return $clone;
      },
      pauseinvisible: {
        visprop: null,
        init: function() {
          var visprop = methods.pauseinvisible.gethiddenprop();
          if (visprop) {
            var evtname = visprop.replace(/[h|h]idden/,'') + 'visibilitychange';
            document.addeventlistener(evtname, function() {
              if (methods.pauseinvisible.ishidden()) {
                if(slider.starttimeout) {
                  cleartimeout(slider.starttimeout); //if clock is ticking, stop timer and prevent from starting while invisible
                } else {
                  slider.pause(); //or just pause
                }
              }
              else {
                if(slider.started) {
                  slider.play(); //initiated before, just play
                } else {
                  if (slider.vars.initdelay > 0) {
                    settimeout(slider.play, slider.vars.initdelay);
                  } else {
                    slider.play(); //didn't init before: simply init or wait for it
                  }
                }
              }
            });
          }
        },
        ishidden: function() {
          var prop = methods.pauseinvisible.gethiddenprop();
          if (!prop) {
            return false;
          }
          return document[prop];
        },
        gethiddenprop: function() {
          var prefixes = ['webkit','moz','ms','o'];
          // if 'hidden' is natively supported just return it
          if ('hidden' in document) {
            return 'hidden';
          }
          // otherwise loop over all the known prefixes until we find one
          for ( var i = 0; i < prefixes.length; i++ ) {
              if ((prefixes[i] + 'hidden') in document) {
                return prefixes[i] + 'hidden';
              }
          }
          // otherwise it's not supported
          return null;
        }
      },
      settoclearwatchedevent: function() {
        cleartimeout(watchedeventcleartimer);
        watchedeventcleartimer = settimeout(function() {
          watchedevent = "";
        }, 3000);
      }
    };


})(jquery);