/*

	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.
	
	
Copyright (c) 2009 John Anderson III

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
	
*/
(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>');}
			
			if(!has_filmstrip) {
				//Add navigation buttons
				$('<img />').addClass('nav-next').attr('src',img_path+'/next_slide.png').appendTo(j_gallery).css({
					'position':'absolute',
					'zIndex':'1100',
					'cursor':'pointer',
					'top':((opts.panel_height-60)/2)+'px',
					'right':'10px',
					'display':'none'
				}).click(showNextItem);
				$('<img />').addClass('nav-prev').attr('src',img_path+'/prev_slide.png').appendTo(j_gallery).css({
					'position':'absolute',
					'zIndex':'1100',
					'cursor':'pointer',
					'top':((opts.panel_height-60)/2)+'px',
					'left':'10px',
					'display':'none'
				}).click(showPrevItem);
						
			}
			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.overlay_width+'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.overlay_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 = $('<img />');
				pointerArrow.attr('src',img_path+'/pointer'+(opts.filmstrip_position=='top'?'-down':'')+'.png').appendTo($('#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+'/next_slide.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+'/prev_slide.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 = 'images';	
				}
			});
			
			//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 = {
		frame_width: 80,
		frame_height: 80,
		filmstrip_size: 3,
		overlay_width: 50,
		overlay_height: 50,
		overlay_font_size: '1em',
		transition_speed: 400,
		transition_interval: 6000,
		overlay_opacity: 0.2,
		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);