/*
 * Thickbox 2.1 - jQuery plugin for displaying content in a box above the page
 * 
 * Copyright (c) 2006, 2007 Cody Lindley (http://www.codylindley.com)
 *
 * Licensed under the MIT License:
 *   http://www.opensource.org/licenses/mit-license.php
 */

// on page load call TB_init
$(document).ready(TB_init);

// add thickbox to href elements that have a class of .thickbox
function TB_init(){
       $("a.thickbox").click(function(event){
              // stop default behaviour
              event.preventDefault();
              // remove click border
              this.blur();
       
              // get caption: either title or name attribute
              var caption = this.title || this.name || "";
              
              // get rel attribute for image groups
              var group = this.rel || false;
              
              // display the box for the elements href
              TB_show(caption, this.href, group);
       });
}

// called when the user clicks on a thickbox link
function TB_show(caption, url, rel) {

       // create iframe, overlay and box if non-existent
       if ( !$("#TB_HideSelect").length ) {
              $("body").append("<iframe id='TB_HideSelect'></iframe><div id='TB_overlay'></div><div id='TB_window'></div>");
              $("#TB_overlay").click(TB_remove);
       }
       // TODO replace or check if event is already assigned
       $(window).scroll(TB_position);
       
       // TODO replace
       TB_overlaySize();
       
       // TODO create loader only once, hide and show on demand
       $("body").append("<div id='TB_load'><img src='loadingAnimation.gif' /></div>");
       TB_load_position();
       
       // check if a query string is involved
       var baseURL = url.match(/(.+)?/)[1] || url;

       // regex to check if a href refers to an image
       var imageURL = /\.(jpe?g|png|gif|bmp)/gi;

       // check for images
       if ( baseURL.match(imageURL) ) {
              var dummy = { caption: "", url: "", html: "" };
              
              var prev = dummy,
                     next = dummy,
                     imageCount = "";
                     
              // if an image group is given
              if ( rel ) {
                     function getInfo(image, id, label) {
                            return {
                                   caption: image.title,
                                   url: image.href,
                                   html: "<span id='TB_" + id + "'>&nbsp;&nbsp;<a href='#'>" + label + "</a></span>"
                            }
                     }
              
                     // find the anchors that point to the group
                     var imageGroup = $("a[@rel="+rel+"]").get();
                     var foundSelf = false;
                     
                     // loop through the anchors, looking for ourself, saving information about previous and next image
                     for (var i = 0; i < imageGroup.length; i++) {
                            var image = imageGroup[i];
                            var urlTypeTemp = image.href.match(imageURL);
                            
                            // look for ourself
                            if ( image.href == url ) {
                                   foundSelf = true;
                                   imageCount = "Image " + (i + 1) + " of "+ (imageGroup.length);
                            } else {
                                   // when we found ourself, the current is the next image
                                   if ( foundSelf ) {
                                          next = getInfo(image, "next", "Next &gt;");
                                          // stop searching
                                          break;
                                   } else {
                                          // didn't find ourself yet, so this may be the one before ourself
                                          prev = getInfo(image, "prev", "&lt; Prev");
                                   }
                            }
                     }
              }
              
              imgPreloader = new Image();
              imgPreloader.onload = function() {
                     imgPreloader.onload = null;

                     // Resizing large images
                     var pagesize = TB_getPageSize();
                     var x = pagesize[0] - 150;
                     var y = pagesize[1] - 150;
                     var imageWidth = imgPreloader.width;
                     var imageHeight = imgPreloader.height;
                     if (imageWidth > x) {
                            imageHeight = imageHeight * (x / imageWidth); 
                            imageWidth = x; 
                            if (imageHeight > y) { 
                                   imageWidth = imageWidth * (y / imageHeight); 
                                   imageHeight = y; 
                            }
                     } else if (imageHeight > y) { 
                            imageWidth = imageWidth * (y / imageHeight); 
                            imageHeight = y; 
                            if (imageWidth > x) { 
                                   imageHeight = imageHeight * (x / imageWidth); 
                                   imageWidth = x;
                            }
                     }
                     // End Resizing
                     
                     // TODO don't use globals
                     TB_WIDTH = imageWidth + 30;
                     TB_HEIGHT = imageHeight + 60;
                     
                     // TODO empty window content instead
                     $("#TB_window").append("<a href='' id='TB_ImageOff' title='Close'><img id='TB_Image' src='"+url+"' width='"+imageWidth+"' height='"+imageHeight+"' alt='"+caption+"'/></a>" + "<div id='TB_caption'>"+caption+"<div id='TB_secondLine'>" + imageCount + prev.html + next.html + "</div></div><div id='TB_closeWindow'><a href='#' id='TB_closeWindowButton' title='Close'>close</a></div>");
                     
                     $("#TB_closeWindowButton").click(TB_remove);
                     
                     function buildClickHandler(image) {
                            return function() {
                                   $("#TB_window").remove();
                                   $("body").append("<div id='TB_window'></div>");
                                   TB_show(image.caption, image.url, rel);
                                   return false;
                            };
                     }
                     var goPrev = buildClickHandler(prev);
                     var goNext = buildClickHandler(next);
                     if ( prev.html ) {
                            $("#TB_prev").click(goPrev);
                     }
                     
                     if ( next.html ) {              
                            $("#TB_next").click(goNext);
                     }
                     
                     // TODO use jQuery, maybe with event fix plugin, or just get the necessary parts of it
                     document.onkeydown = function(e) {
                            if (e == null) { // ie
                                   keycode = event.keyCode;
                            } else { // mozilla
                                   keycode = e.which;
                            }
                            switch(keycode) {
                            case 27:
                                   TB_remove();
                                   break;
                            case 190:
                                   if( next.html ) {
                                          document.onkeydown = null;
                                          goNext();
                                   }
                                   break;
                            case 188:
                                   if( prev.html ) {
                                          document.onkeydown = null;
                                          goPrev();
                                   }
                                   break;
                            }
                     }
                     
                     // TODO don't remove loader etc., just hide and show later
                     TB_position();
                     $("#TB_load").remove();
                     $("#TB_ImageOff").click(TB_remove);
                     
                     // for safari using css instead of show
                     // TODO is that necessary? can't test safari
                     $("#TB_window").css({display:"block"});
              }
              imgPreloader.src = url;
              
       } else { //code to show html pages
              
              var queryString = url.match(/\?(.+)/)[1];
              var params = TB_parseQuery( queryString );
              
              TB_WIDTH = (params['width']*1) + 30;
              TB_HEIGHT = (params['height']*1) + 40;

              var ajaxContentW = TB_WIDTH - 30,
                     ajaxContentH = TB_HEIGHT - 45;
              
              if(url.indexOf('TB_iframe') != -1){                            
                     urlNoQuery = url.split('TB_');              
                     $("#TB_window").append("<div id='TB_title'><div id='TB_ajaxWindowTitle'>"+caption+"</div><div id='TB_closeAjaxWindow'><a href='#' id='TB_closeWindowButton' title='Close'>close</a></div></div><iframe frameborder='0' hspace='0' src='"+urlNoQuery[0]+"' id='TB_iframeContent' name='TB_iframeContent' style='width:"+(ajaxContentW + 29)+"px;height:"+(ajaxContentH + 17)+"px;' onload='TB_showIframe()'> </iframe>");
              } else {
                     $("#TB_window").append("<div id='TB_title'><div id='TB_ajaxWindowTitle'>"+caption+"</div><div id='TB_closeAjaxWindow'><a href='#' id='TB_closeWindowButton'>close</a></div></div><div id='TB_ajaxContent' style='width:"+ajaxContentW+"px;height:"+ajaxContentH+"px;'></div>");
              }
                            
              $("#TB_closeWindowButton").click(TB_remove);
              
                     if(url.indexOf('TB_inline') != -1){       
                            $("#TB_ajaxContent").html($('#' + params['inlineId']).html());
                            TB_position();
                            $("#TB_load").remove();
                            $("#TB_window").css({display:"block"}); 
                     }else if(url.indexOf('TB_iframe') != -1){
                            TB_position();
                            if(frames['TB_iframeContent'] == undefined){//be nice to safari
                                   $("#TB_load").remove();
                                   $("#TB_window").css({display:"block"});
                                   $(document).keyup( function(e){ var key = e.keyCode; if(key == 27){TB_remove()} });
                            }
                     }else{
                            $("#TB_ajaxContent").load(url, function(){
                                   TB_position();
                                   $("#TB_load").remove();
                                   $("#TB_window").css({display:"block"}); 
                            });
                     }
              
       }
       
       $(window).resize(TB_position);
       
       document.onkeyup = function(e){        
              if (e == null) { // ie
                     keycode = event.keyCode;
              } else { // mozilla
                     keycode = e.which;
              }
              if(keycode == 27){ // close
                     TB_remove();
              }       
       }
              
}

//helper functions below

function TB_showIframe(){
       $("#TB_load").remove();
       $("#TB_window").css({display:"block"});
}

function TB_remove() {
        $("#TB_imageOff").unbind("click");
       $("#TB_overlay").unbind("click");
       $("#TB_closeWindowButton").unbind("click");
       $("#TB_window").fadeOut("fast",function(){$('#TB_window,#TB_overlay,#TB_HideSelect').remove();});
       $("#TB_load").remove();
       return false;
}

function TB_position() {
       var pagesize = TB_getPageSize();       
       var arrayPageScroll = TB_getPageScrollTop();
       var style = {width: TB_WIDTH, left: (arrayPageScroll[0] + (pagesize[0] - TB_WIDTH)/2), top: (arrayPageScroll[1] + (pagesize[1]-TB_HEIGHT)/2)};
       $("#TB_window").css(style);
}

function TB_overlaySize(){
       if (window.innerHeight && window.scrollMaxY || window.innerWidth && window.scrollMaxX) {       
              yScroll = window.innerHeight + window.scrollMaxY;
              xScroll = window.innerWidth + window.scrollMaxX;
              var deff = document.documentElement;
              var wff = (deff&&deff.clientWidth) || document.body.clientWidth || window.innerWidth || self.innerWidth;
              var hff = (deff&&deff.clientHeight) || document.body.clientHeight || window.innerHeight || self.innerHeight;
              xScroll -= (window.innerWidth - wff);
              yScroll -= (window.innerHeight - hff);
       } else if (document.body.scrollHeight > document.body.offsetHeight || document.body.scrollWidth > document.body.offsetWidth){ // all but Explorer Mac
              yScroll = document.body.scrollHeight;
              xScroll = document.body.scrollWidth;
       } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
              yScroll = document.body.offsetHeight;
              xScroll = document.body.offsetWidth;
         }
       $("#TB_overlay").css({"height": yScroll, "width": xScroll});
       $("#TB_HideSelect").css({"height": yScroll,"width": xScroll});
}

function TB_load_position() {
       var pagesize = TB_getPageSize();
       var arrayPageScroll = TB_getPageScrollTop();
       $("#TB_load")
              .css({left: (arrayPageScroll[0] + (pagesize[0] - 100)/2), top: (arrayPageScroll[1] + ((pagesize[1]-100)/2)) })
              .css({display:"block"});
}

function TB_parseQuery ( query ) {
       // return empty object
       if( !query )
              return {};
       var params = {};
       
       // parse query
       var pairs = query.split(/[;&]/);
       for ( var i = 0; i < pairs.length; i++ ) {
              var pair = pairs[i].split('=');
              if ( !pair || pair.length != 2 )
                     continue;
              // unescape both key and value, replace "+" with spaces in value
              params[unescape(pair[0])] = unescape(pair[1]).replace(/\+/g, ' ');
   }
   return params;
}

function TB_getPageScrollTop(){
       var yScrolltop;
       var xScrollleft;
       if (self.pageYOffset || self.pageXOffset) {
              yScrolltop = self.pageYOffset;
              xScrollleft = self.pageXOffset;
       } else if (document.documentElement && document.documentElement.scrollTop || document.documentElement.scrollLeft ){        // Explorer 6 Strict
              yScrolltop = document.documentElement.scrollTop;
              xScrollleft = document.documentElement.scrollLeft;
       } else if (document.body) {// all other Explorers
              yScrolltop = document.body.scrollTop;
              xScrollleft = document.body.scrollLeft;
       }
       arrayPageScroll = new Array(xScrollleft,yScrolltop) 
       return arrayPageScroll;
}

function TB_getPageSize(){
       var de = document.documentElement;
       var w = window.innerWidth || self.innerWidth || (de&&de.clientWidth) || document.body.clientWidth;
       var h = window.innerHeight || self.innerHeight || (de&&de.clientHeight) || document.body.clientHeight
       arrayPageSize = new Array(w,h) 
       return arrayPageSize;
}