/*
    Slideshow(string:id, int:index, boolean:wrap)
    usage: mySlideshow = new Slideshow("coming-soon", 0, true);
*/
function Slideshow(_id, _totalslides, _wrap) {
    var totalslides, index, wrap, prefix, suffix, image, src, context, current;
    var slideshow = document.getElementById(_id);
    var _images = slideshow.getElementsByTagName("img");
    image = _images[0];
    context = this;
    
    src = image.getAttribute("src");
    // parse the url
    // assumes image_001@640.jpg
    var _a = src.indexOf("_");
    var _b = src.indexOf("@");
    if (_b < 0) {
        _b = src.indexOf(".");
    } 
    
    prefix = src.substring(0,_a+1);
    suffix = src.substring(_b,src.length);
    index = parseInt(src.substring(_a+1, _b));
    totalslides = _totalslides;
    
    // does the slideshow wrap around at the beginning and end?
    (_wrap)? wrap = _wrap : wrap = false;
    
    // if the slideshow id isn't found do nothing (false)...
    (slideshow)?init():false;
    
    function init() {

        // find and enable the previous and next controls, and current slide display
        var _ul = slideshow.getElementsByTagName("ul");
        for (var i=0; i < _ul.length; i++) {
            var _li = _ul[0].getElementsByTagName("li");
            for (var j=0; j < _li.length; j++) {
                var isCurrent = _li[j].className.search(/current/)+1;
                if (isCurrent) {
                    current = _li[j];
                }
                var isPrevious = _li[j].className.search(/previous/)+1;
                if (isPrevious) {
                    var _a = _li[j].getElementsByTagName("a");
                    _a[0].onclick = function() {
                        context.previous();
                        return false;
                    }
                }
                
                var isNext = _li[j].className.search(/next/)+1;
                if (isNext) {
                    var _a = _li[j].getElementsByTagName("a");
                    _a[0].onclick = function() {
                        context.next();
                        return false;
                    }
                }
            }
        }
        // kick things off with an initial update
        update();
    }

    function update() {
        // tweak index if at start or end based on wrap property
        (index<1)?((wrap)?index=totalslides:index=1):false;
        (index>totalslides)?((wrap)?index=1:index=totalslides):false;
        // update the view
        image.setAttribute("src", prefix+(("00" + index).slice (-3))+suffix);
        current.innerHTML = index + "/" + totalslides;
    }
    this.previous = function () {
        // select the previous image by index and update the view
        index--;update();
    }
    
    this.next = function () {
        // select the next image by index and update the view
        index++;update();
    }
}
/*
    Cookies
    http://www.yourhtmlsource.com/javascript/cookies.html
*/
function createCookie(name,value,days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires = "; expires="+date.toGMTString();
    }
    else var expires = "";
    document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}
function eraseCookie(name) {
    createCookie(name,"",-1);
}
/*
    Detecting Flash Player with JavaScript
    http://www.prodevtips.com/2008/11/20/detecting-flash-player-version-with-javascript/
*/
function supports_flash() {
      // ie
      try {
        try {
          // avoid fp6 minor version lookup issues
          // see: http://blog.deconcept.com/2006/01/11/getvariable-setvariable-crash-internet-explorer-flash-6/
          var axo = new ActiveXObject('ShockwaveFlash.ShockwaveFlash.6');
          try { axo.AllowScriptAccess = 'always'; }
          catch(e) { return '6,0,0'; }
        } catch(e) {}
            var v = new ActiveXObject('ShockwaveFlash.ShockwaveFlash').GetVariable('$version').replace(/\D+/g, ',').match(/^,?(.+),?$/)[1] ;
            return v.replace(/,/gi, '.');
      // other browsers
      } catch(e) {
        try {
          if(navigator.mimeTypes["application/x-shockwave-flash"].enabledPlugin){
            var v = (navigator.plugins["Shockwave Flash 2.0"] || navigator.plugins["Shockwave Flash"]).description.replace(/\D+/g, ",").match(/^,?(.+),?$/)[1];
            return v.replace(/,/gi, '.');
          }
        } catch(e) {}
      }
      return '0.0.0';
}
/*
    Detecting XMLHttpRequest Object
    http://en.wikipedia.org/wiki/XMLHttpRequest
*/
function supports_XMLHttpRequest() {
    var xhr = null;
    try { xhr = new XMLHttpRequest(); } catch (e) {}
    try { xhr = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {}
    try { xhr = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) {}
    return (xhr!=null); 
}
/*
    Detecting HTML5 Features
    http://diveintohtml5.org/detect.html by Mark Pilgrim
*/
function supports_canvas() {
  return !!document.createElement('canvas').getContext;
}
function supports_video() {
  return !!document.createElement('video').canPlayType;
}
function supports_h264_baseline_video() {
  if (!supports_video()) { return false; }
  var v = document.createElement("video");
  return v.canPlayType('video/mp4; codecs="avc1.42E01E, mp4a.40.2"');
}
function supports_ogg_theora_video() {
  if (!supports_video()) { return false; }
  var v = document.createElement("video");
  return v.canPlayType('video/ogg; codecs="theora, vorbis"');
}
function supports_webm_video() {
  if (!supports_video()) { return false; }
  var v = document.createElement("video");
  return v.canPlayType('video/webm; codecs="vp8, vorbis"');
}
function supports_offline() {
  return !!window.applicationCache;
}
function supports_geolocation() {
  return !!navigator.geolocation;
}
function supports_local_storage() {
  try {
    return 'localStorage' in window && window['localStorage'] !== null;
  } catch(e){
    return false;
  }
}
/*
    Unobtrusive JavaScript
    http://www.onlinetools.org/articles/unobtrusivejavascript/chapter4.html 
*/
function addEvent(obj, evType, fn){ 
 if (obj.addEventListener){ 
   obj.addEventListener(evType, fn, false); 
   return true; 
 } else if (obj.attachEvent){ 
   var r = obj.attachEvent("on"+evType, fn); 
   return r; 
 } else { 
   return false; 
 } 
}
/*
{ width: {
    screen: x, 
    document: x
    },
  xhr: boolean,
  canvas: boolean, 
  flash: 10.1.1,
  video: boolean {
    h264: string,
    ogg: string,
    webm: string
    },
  offline: true,
  geolocation: true,
  storage: true
}
*/
function update() {
    var properties = "{width:{screen:"+screen.width+",document:"+document.body.clientWidth+"},xhr:"+supports_XMLHttpRequest()
    +",canvas:"+supports_canvas()
    +",flash:"+supports_flash()
    +",video:"+supports_video()+",formats:{h264:"+supports_h264_baseline_video()+",ogg:"+supports_ogg_theora_video()+",webm:"+supports_webm_video()+"}"
    +",offline:"+supports_offline()
    +"}";
    createCookie('properties',properties,30);
}

addEvent(window, 'load', update);
addEvent(window, 'resize', update);