/*

       GalleryView - jQuery Content Gallery Plugin
       Author:               Jack Anderson
       Version:              1.1 (April 5, 2009)
       Documentation:        http://www.spaceforaname.com/jquery/galleryview/
       
       Please use this development script if you intend to make changes to the
       plugin code.  For production sites, please use jquery.galleryview-1.0.1-pack.js.
       
*/
(function($){
       $.fn.galleryView = function(options) {
              var opts = $.extend($.fn.galleryView.defaults,options);
              
              var id;
              var iterator = 0;
              var gallery_width;
              var gallery_height;
              var frame_margin = 10;
              var strip_width;
              var wrapper_width;
              var item_count = 0;
              var slide_method;
              var img_path;
              var paused = false;
              var frame_caption_size = 20;
              var frame_margin_top = 5;
              var pointer_width = 2;
              
              //Define jQuery objects for reuse
              var j_gallery;
              var j_filmstrip;
              var j_frames;
              var j_panels;
              var j_pointer;
              
/************************************************/
/*       Plugin Methods                                                        */
/************************************************/       
              function showItem(i) {
                     //Disable next/prev buttons until transition is complete
                     $('img.nav-next').unbind('click');
                     $('img.nav-prev').unbind('click');
                     j_frames.unbind('click');
                     if(has_panels) {
                            if(opts.fade_panels) {
                                   //Fade out all panels and fade in target panel
                                   j_panels.fadeOut(opts.transition_speed).eq(i%item_count).fadeIn(opts.transition_speed,function(){
                                          if(!has_filmstrip) {
                                                 $('img.nav-prev').click(showPrevItem);
                                                 $('img.nav-next').click(showNextItem);              
                                          }
                                   });
                            } 
                     }
                     
                     if(has_filmstrip) {
                            //Slide either pointer or filmstrip, depending on transition method
                            if(slide_method=='strip') {
                                   //Stop filmstrip if it's currently in motion
                                   j_filmstrip.stop();
                                   
                                   //Determine distance between pointer (eventual destination) and target frame
                                   var distance = getPos(j_frames[i]).left - (getPos(j_pointer[0]).left+2);
                                   var leftstr = (distance>=0?'-=':'+=')+Math.abs(distance)+'px';
                                   
                                   //Animate filmstrip and slide target frame under pointer
                                   //If target frame is a duplicate, jump back to 'original' frame
                                   j_filmstrip.animate({
                                          'left':leftstr
                                   },opts.transition_speed,opts.easing,function(){
                                          //Always ensure that there are a sufficient number of hidden frames on either
                                          //side of the filmstrip to avoid empty frames
                                          if(i>item_count) {
                                                 i = i%item_count;
                                                 iterator = i;
                                                 j_filmstrip.css('left','-'+((opts.frame_width+frame_margin)*i)+'px');
                                          } else if (i<=(item_count-strip_size)) {
                                                 i = (i%item_count)+item_count;
                                                 iterator = i;
                                                 j_filmstrip.css('left','-'+((opts.frame_width+frame_margin)*i)+'px');
                                          }
                                          
                                          if(!opts.fade_panels) {
                                                 j_panels.hide().eq(i%item_count).show();
                                          }
                                          $('img.nav-prev').click(showPrevItem);
                                          $('img.nav-next').click(showNextItem);
                                          enableFrameClicking();
                                   });
                            } else if(slide_method=='pointer') {
                                   //Stop pointer if it's currently in motion
                                   j_pointer.stop();
                                   //Get position of target frame
                                   var pos = getPos(j_frames[i]);
                                   //Slide the pointer over the target frame
                                   j_pointer.animate({
                                          'left':(pos.left-2+'px')
                                   },opts.transition_speed,opts.easing,function(){       
                                          if(!opts.fade_panels) {
                                                 j_panels.hide().eq(i%item_count).show();
                                          }       
                                          $('img.nav-prev').click(showPrevItem);
                                          $('img.nav-next').click(showNextItem);
                                          enableFrameClicking();
                                   });
                            }
                     
                            if($('a',j_frames[i])[0]) {
                                   j_pointer.unbind('click').click(function(){
                                          var a = $('a',j_frames[i]).eq(0);
                                          if(a.attr('target')=='_blank') {window.open(a.attr('href'));}
                                          else {location.href = a.attr('href');}
                                   });
                            }
                     }
              };
              function showNextItem() {
                     $(document).stopTime("transition");
                     if(++iterator==j_frames.length) {iterator=0;}
                     showItem(iterator);
                     $(document).everyTime(opts.transition_interval,"transition",function(){
                            showNextItem();
                     });
              };
              function showPrevItem() {
                     $(document).stopTime("transition");
                     if(--iterator<0) {iterator = item_count-1;}
                     //alert(iterator);
                     showItem(iterator);
                     $(document).everyTime(opts.transition_interval,"transition",function(){
                            showNextItem();
                     });
              };
              function getPos(el) {
                     var left = 0, top = 0;
                     var el_id = el.id;
                     if(el.offsetParent) {
                            do {
                                   left += el.offsetLeft;
                                   top += el.offsetTop;
                            } while(el = el.offsetParent);
                     }
                     //If we want the position of the gallery itself, return it
                     if(el_id == id) {return {'left':left,'top':top};}
                     //Otherwise, get position of element relative to gallery
                     else {
                            var gPos = getPos(j_gallery[0]);
                            var gLeft = gPos.left;
                            var gTop = gPos.top;
                            
                            return {'left':left-gLeft,'top':top-gTop};
                     }
              };
              function enableFrameClicking() {
                     j_frames.each(function(i){
                            //If there isn't a link in this frame, set up frame to slide on click
                            //Frames with links will handle themselves
                            if($('a',this).length==0) {
                                   $(this).click(function(){
                                          $(document).stopTime("transition");
                                          showItem(i);
                                          iterator = i;
                                          $(document).everyTime(opts.transition_interval,"transition",function(){
                                                 showNextItem();
                                          });
                                   });
                            }
                     });
              };
              
              function buildPanels() {
                     //If there are panel captions, add overlay divs
                     if($('.panel-overlay').length>0) {j_panels.append('<div class="overlay"></div>');}
                     
   
                     j_panels.css({
                            'width':(opts.panel_width-parseInt(j_panels.css('paddingLeft').split('px')[0],10)-parseInt(j_panels.css('paddingRight').split('px')[0],10))+'px',
                            'height':(opts.panel_height-parseInt(j_panels.css('paddingTop').split('px')[0],10)-parseInt(j_panels.css('paddingBottom').split('px')[0],10))+'px',
                            'position':'absolute',
                            'top':(opts.filmstrip_position=='top'?(opts.frame_height+frame_margin_top+(opts.show_captions?frame_caption_size:frame_margin_top))+'px':'0px'),
                            'left':'0px',
                            'overflow':'hidden',
                            'background':'white',
                            'display':'none'
                     });
                     $('.panel-overlay',j_panels).css({
                            'position':'absolute',
                            'zIndex':'999',
                            'width':(opts.panel_width-20)+'px',
                            'height':opts.overlay_height+'px',
                            'top':(opts.overlay_position=='top'?'0':opts.panel_height-opts.overlay_height+'px'),
                            'left':'0',
                            'padding':'0 10px',
                            'color':opts.overlay_text_color,
                            'fontSize':opts.overlay_font_size
                     });
                     $('.panel-overlay a',j_panels).css({
                            'color':opts.overlay_text_color,
                            'textDecoration':'underline',
                            'fontWeight':'bold'
                     });
                     $('.overlay',j_panels).css({
                            'position':'absolute',
                            'zIndex':'998',
                            'width':opts.panel_width+'px',
                            'height':opts.overlay_height+'px',
                            'top':(opts.overlay_position=='top'?'0':opts.panel_height-opts.overlay_height+'px'),
                            'left':'0',
                            'background':opts.overlay_color,
                            'opacity':opts.overlay_opacity
                     });
                     $('.panel iframe',j_panels).css({
                            'width':opts.panel_width+'px',
                            'height':(opts.panel_height-opts.overlay_height)+'px',
                            'border':'0'
                     });
              };
              
              function buildFilmstrip() {
                     //Add wrapper to filmstrip to hide extra frames
                     j_filmstrip.wrap('<div class="strip_wrapper"></div>');
                     if(slide_method=='strip') {
                            j_frames.clone().appendTo(j_filmstrip);
                            j_frames.clone().appendTo(j_filmstrip);
                            j_frames = $('li',j_filmstrip);
                     }
                     //If captions are enabled, add caption divs and fill with the image titles
                     if(opts.show_captions) {
                            j_frames.append('<div class="caption"></div>').each(function(i){
                                   $(this).find('.caption').html($(this).find('img').attr('title'));                        
                            });
                     }
                     
                     j_filmstrip.css({
                            'listStyle':'none',
                            'margin':'0',
                            'padding':'0',
                            'width':strip_width+'px',
                            'position':'absolute',
                            'zIndex':'900',
                            'top':'0',
                            'left':'0',
                            'height':(opts.frame_height+10)+'px',
                            'background':opts.background_color
                     });
                     j_frames.css({
                            'float':'left',
                            'position':'relative',
                            'height':opts.frame_height+'px',
                            'zIndex':'901',
                            'marginTop':frame_margin_top+'px',
                            'marginBottom':'0px',
                            'marginRight':frame_margin+'px',
                            'padding':'0',
                            'cursor':'pointer'
                     });
                     $('img',j_frames).css({
                            'border':'none'
                     });
                     $('.strip_wrapper',j_gallery).css({
                            'position':'absolute',
                            'top':(opts.filmstrip_position=='top'?'0px':opts.panel_height+'px'),
                            'left':((gallery_width-wrapper_width)/2)+'px',
                            'width':wrapper_width+'px',
                            'height':(opts.frame_height+frame_margin_top+(opts.show_captions?frame_caption_size:frame_margin_top))+'px',
                            'overflow':'hidden'
                     });
                     $('.caption',j_gallery).css({
                            'position':'absolute',
                            'top':opts.frame_height+'px',
                            'left':'0',
                            'margin':'0',
                            'width':opts.frame_width+'px',
                            'padding':'0',
                            'color':opts.caption_text_color,
                            'textAlign':'center',
                            'fontSize':'10px',
                            'height':frame_caption_size+'px',
                            
                            'lineHeight':frame_caption_size+'px'
                     });
                     var pointer = $('<div></div>');
                     pointer.attr('id','pointer').appendTo(j_gallery).css({
                             'position':'absolute',
                             'zIndex':'1000',
                             'cursor':'pointer',
                             'top':getPos(j_frames[0]).top-(pointer_width/2)+'px',
                             'left':getPos(j_frames[0]).left-(pointer_width/2)+'px',
                             'height':opts.frame_height-pointer_width+'px',
                             'width':opts.frame_width-pointer_width+'px',
                             'border':(has_panels?pointer_width+'px solid '+(opts.nav_theme=='dark'?'black':'white'):'none')
                     });
                     j_pointer = $('#pointer',j_gallery);
                     if(has_panels) {
                            var pointerArrow = $('<img />');
                            pointerArrow.attr('src',img_path+opts.nav_theme+'/pointer'+(opts.filmstrip_position=='top'?'-down':'')+'.png').appendTo($('#pointer')).css({
                                   'position':'absolute',
                                   'zIndex':'1001',
                                   'top':(opts.filmstrip_position=='bottom'?'-'+(10+pointer_width)+'px':opts.frame_height+'px'),
                                   'left':((opts.frame_width/2)-10)+'px'
                            });
                     }
                     
                     //If the filmstrip is animating, move the strip to the middle third
                     if(slide_method=='strip') {
                            j_filmstrip.css('left','-'+((opts.frame_width+frame_margin)*item_count)+'px');
                            iterator = item_count;
                     }
                     //If there's a link under the pointer, enable clicking on the pointer
                     if($('a',j_frames[iterator])[0]) {
                            j_pointer.click(function(){
                                   var a = $('a',j_frames[iterator]).eq(0);
                                   if(a.attr('target')=='_blank') {window.open(a.attr('href'));}
                                   else {location.href = a.attr('href');}
                            });
                     }
                     
                     //Add navigation buttons
                     $('<img />').addClass('nav-next').attr('src',img_path+opts.nav_theme+'/next.png').appendTo(j_gallery).css({
                            'position':'absolute',
                            'cursor':'pointer',
                            'top':(opts.filmstrip_position=='top'?0:opts.panel_height)+frame_margin_top+((opts.frame_height-22)/2)+'px',
                            'right':(gallery_width/2)-(wrapper_width/2)-10-22+'px'
                     }).click(showNextItem);
                     $('<img />').addClass('nav-prev').attr('src',img_path+opts.nav_theme+'/prev.png').appendTo(j_gallery).css({
                            'position':'absolute',
                            'cursor':'pointer',
                            'top':(opts.filmstrip_position=='top'?0:opts.panel_height)+frame_margin_top+((opts.frame_height-22)/2)+'px',
                            'left':(gallery_width/2)-(wrapper_width/2)-10-22+'px'
                     }).click(showPrevItem);
              };
              
              //Check mouse to see if it is within the borders of the panel
              //More reliable than 'mouseover' event when elements overlay the panel
              function mouseIsOverPanels(x,y) {              
                     var pos = getPos(j_gallery[0]);
                     var top = pos.top;
                     var left = pos.left;
                     return x > left && x < left+opts.panel_width && y > top && y < top+opts.panel_height;                            
              };
              
/************************************************/
/*       Main Plugin Code                                                 */
/************************************************/
              return this.each(function() {
                     j_gallery = $(this);
                     //Determine path between current page and filmstrip images
                     //Scan script tags and look for path to GalleryView plugin
                     $('script').each(function(i){
                            var s = $(this);
                            if(s.attr('src') && s.attr('src').match(/jquery\.galleryview/)){
                                   img_path = s.attr('src').split('jquery.galleryview')[0]+'themes/';       
                            }
                     });
                     
                     //Hide gallery to prevent Flash of Unstyled Content (FoUC) in IE
                     j_gallery.css('visibility','hidden');
                     
                     //Assign elements to variables for reuse
                     j_filmstrip = $('.filmstrip',j_gallery);
                     j_frames = $('li',j_filmstrip);
                     j_panels = $('.panel',j_gallery);
                     
                     id = j_gallery.attr('id');
                     
                     has_panels = j_panels.length > 0;
                     has_filmstrip = j_frames.length > 0;
                     
                     if(!has_panels) opts.panel_height = 0;
                     
                     //Number of frames in filmstrip
                     item_count = has_panels?j_panels.length:j_frames.length;
                     
                     //Number of frames that can display within the screen's width
                     //64 = width of block for navigation button * 2
                     //5 = minimum frame margin
                     strip_size = has_panels?Math.floor((opts.panel_width-64)/(opts.frame_width+frame_margin)):Math.min(item_count,opts.filmstrip_size); 
                     
                     
                     /************************************************/
                     /*       Determine transition method for filmstrip       */
                     /************************************************/
                                   //If more items than strip size, slide filmstrip
                                   //Otherwise, slide pointer
                                   if(strip_size >= item_count) {
                                          slide_method = 'pointer';
                                          strip_size = item_count;
                                   }
                                   else {slide_method = 'strip';}
                     
                     /************************************************/
                     /*       Determine dimensions of various elements       */
                     /************************************************/
                                   
                                   //Width of gallery block
                                   gallery_width = has_panels?opts.panel_width:(strip_size*(opts.frame_width+frame_margin))-frame_margin+64;
                                   
                                   //Height of gallery block = screen + filmstrip + captions (optional)
                                   gallery_height = (has_panels?opts.panel_height:0)+(has_filmstrip?opts.frame_height+frame_margin_top+(opts.show_captions?frame_caption_size:frame_margin_top):0);
                                   
                                   //Width of filmstrip
                                   if(slide_method == 'pointer') {strip_width = (opts.frame_width*item_count)+(frame_margin*(item_count));}
                                   else {strip_width = (opts.frame_width*item_count*3)+(frame_margin*(item_count*3));}
                                   
                                   //Width of filmstrip wrapper (to hide overflow)
                                   wrapper_width = ((strip_size*opts.frame_width)+((strip_size-1)*frame_margin));
                     
                     /************************************************/
                     /*       Apply CSS Styles                                                 */
                     /************************************************/
                                   j_gallery.css({
                                          'position':'relative',
                                          'margin':'0',
                                          'background':opts.background_color,
                                          'border':opts.border,
                                          'width':gallery_width+'px',
                                          'height':gallery_height+'px'
                                   });
                     
                     /************************************************/
                     /*       Build filmstrip and/or panels                            */
                     /************************************************/
                                   if(has_filmstrip) {
                                          buildFilmstrip();
                                   }
                                   if(has_panels) {
                                          buildPanels();
                                   }

                     
                     /************************************************/
                     /*       Add events to various elements                            */
                     /************************************************/
                                   if(has_filmstrip) enableFrameClicking();
                                   
                                          
                                          
                                          $().mousemove(function(e){                                                 
                                                 if(mouseIsOverPanels(e.pageX,e.pageY)) {
                                                        if(opts.pause_on_hover) {
                                                               $(document).oneTime(500,"animation_pause",function(){
                                                                      $(document).stopTime("transition");
                                                                      paused=true;
                                                               });
                                                        }
                                                        if(has_panels && !has_filmstrip) {
                                                               $('.nav-overlay').fadeIn('fast');
                                                               $('.nav-next').fadeIn('fast');
                                                               $('.nav-prev').fadeIn('fast');
                                                        }
                                                 } else {
                                                        if(opts.pause_on_hover) {
                                                               $(document).stopTime("animation_pause");
                                                               if(paused) {
                                                                      $(document).everyTime(opts.transition_interval,"transition",function(){
                                                                             showNextItem();
                                                                      });
                                                                      paused = false;
                                                               }
                                                        }
                                                        if(has_panels && !has_filmstrip) {
                                                               $('.nav-overlay').fadeOut('fast');
                                                               $('.nav-next').fadeOut('fast');
                                                               $('.nav-prev').fadeOut('fast');
                                                        }
                                                 }
                                          });
                     
                     
                     /************************************************/
                     /*       Initiate Automated Animation                            */
                     /************************************************/
                                   //Show the first panel
                                   j_panels.eq(0).show();

                                   //If we have more than one item, begin automated transitions
                                   if(item_count > 1) {
                                          $(document).everyTime(opts.transition_interval,"transition",function(){
                                                 showNextItem();
                                          });
                                   }
                                   
                                   //Make gallery visible now that work is complete
                                   j_gallery.css('visibility','visible');
              });
       };
       
       $.fn.galleryView.defaults = {
              panel_width: 400,
              panel_height: 300,
              frame_width: 80,
              frame_height: 80,
              filmstrip_size: 3,
              overlay_height: 70,
              overlay_font_size: '1em',
              transition_speed: 400,
              transition_interval: 6000,
              overlay_opacity: 0.6,
              overlay_color: 'black',
              background_color: 'black',
              overlay_text_color: 'white',
              caption_text_color: 'white',
              border: '1px solid black',
              nav_theme: 'light',
              easing: 'swing',
              filmstrip_position: 'bottom',
              overlay_position: 'bottom',
              show_captions: false,
              fade_panels: true,
              pause_on_hover: false
       };
})(jQuery);