/*

	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);
		
		// Obtenemos los valores de las css
		opts.panel_width = $(".panel").width();
		opts.panel_height = $(".panel").height();
		
		if($(".filmstrip li img").length) {
			opts.frame_width =  $(".filmstrip li img").width();
			opts.frame_height = $(".filmstrip li img").height();
		}
		else {
			opts.frame_width =  $(".filmstrip li div").width();
			opts.frame_height = $(".filmstrip li div").height();
		}
		
		// Deshabilitamos los fades en el explorer 6 (problemas con los pngs de fongo)
		var userAgent = navigator.userAgent.toLowerCase();
		jQuery.browser = {
			version: (userAgent.match( /.+(?:rv|it|ra|ie|me)[\/: ]([\d.]+)/ ) || [])[1],
			chrome: /chrome/.test( userAgent ),
			safari: /webkit/.test( userAgent ) && !/chrome/.test( userAgent ),
			opera: /opera/.test( userAgent ),
			msie: /msie/.test( userAgent ) && !/opera/.test( userAgent ),
			mozilla: /mozilla/.test( userAgent ) && !/(compatible|webkit)/.test( userAgent )
		};
		
		if ($.browser.msie){
			if ($.browser.version<=6) opts.fade_panels = false;
		}
		
		var id;
		var iterator = 0;
		var gallery_width;
		var gallery_height;
		var frame_margin = 12;
		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 = 0;
		
		//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+pointer_width);
					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-pointer_width+'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;}
			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(!has_filmstrip && !$(".nav-next").length) {
				
				//Add navigation buttons
				$('<img />').addClass('nav-next').attr('src',img_path+opts.nav_theme+'/next.gif').appendTo(j_gallery).css({
					'right':'10px',
					'display':'none'
				}).click(showNextItem);
				$('<img />').addClass('nav-prev').attr('src',img_path+opts.nav_theme+'/prev.gif').appendTo(j_gallery).css({
					'left':'10px',
					'display':'none'
				}).click(showPrevItem);
				$('<img />').addClass('nav-overlay').attr('src',img_path+opts.nav_theme+'/panel-nav-next.gif').appendTo(j_gallery).css({
					'position':'absolute',
					'zIndex':'1099',
					'top':((opts.panel_height-opts.anchoBotones)/2)-10+'px',
					'right':'0',
					'display':'none'
				});
				$('<img />').addClass('nav-overlay').attr('src',img_path+opts.nav_theme+'/panel-nav-prev.gif').appendTo(j_gallery).css({
					'position':'absolute',
					'zIndex':'1099',
					'top':((opts.panel_height-opts.anchoBotones)/2)-10+'px',
					'left':'0',
					'display':'none'
					
				});
			}
		};
		
		function buildFilmstrip() {
			//Add wrapper to filmstrip to hide extra frames
			if(!$('.strip_wrapper').length) {
				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({
				'width':strip_width+'px',
				'visibility':'visible'
			});
			
			$('.strip_wrapper',j_gallery).css({
				'width':wrapper_width+'px'
			});
			
			// Calcular la posicion
			switch(opts.posicion_navegacion) {
				case "left":		
					$('.strip_wrapper',j_gallery).css({'left': opts.anchoBotones + (frame_margin * 2) + 'px'});
				break;
				case "right":		
					$('.strip_wrapper',j_gallery).css({'right': opts.anchoBotones + (frame_margin * 2) + 'px'});
				break;
				case "center":	
					$('.strip_wrapper',j_gallery).css({'left': ((gallery_width-wrapper_width)/2) + 'px'});
				break;
			}

			var pointer = $('<div></div>');
			if(!$('#pointer').length) {
				pointer.attr('id','pointer').appendTo(j_gallery).css({
					 'left':getPos(j_frames[0]).left-(pointer_width/2)+'px',
					 'width':opts.frame_width-pointer_width-2+'px'
				});
			}
			j_pointer = $('#pointer',j_gallery);
			if(!$('#pointer img').length) {
				if(has_panels) {
					var pointerArrow = $('<img />');
					pointerArrow.attr('src',img_path+opts.nav_theme+'/pointer.gif').appendTo($('#pointer'));
				}
			}
			
			//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
			if(!$('.nav-next').length) {

				$('<img />').addClass('nav-next').attr('src',img_path+opts.nav_theme+'/next.gif').appendTo(j_gallery).click(showNextItem);
				
				// Calcular la posicion del boton
				switch(opts.posicion_navegacion) {
					case "left":		$('.nav-next').css({'left':wrapper_width + opts.anchoBotones + (3 * frame_margin) +'px'});
													break;
					case "right":		$('.nav-next').css({'right':frame_margin + 'px'});
													break;
					case "center":	$('.nav-next').css({'right':(gallery_width/2)-(wrapper_width/2)-10-opts.anchoBotones +'px'});
													break;
				}

			}
			if(!$('.nav-prev').length) {
				
				$('<img />').addClass('nav-prev').attr('src',img_path+opts.nav_theme+'/prev.gif').appendTo(j_gallery).click(showPrevItem);
				
				// Calcular la posicion del boton
				switch(opts.posicion_navegacion) {
					case "left":		$('.nav-prev').css({'left':frame_margin + 'px'});
													break;
					case "right":		$('.nav-prev').css({'right':wrapper_width + opts.anchoBotones + (3 * frame_margin) +'px'});
													break;
					case "center":	$('.nav-prev').css({'left':(gallery_width/2)-(wrapper_width/2)-10-opts.anchoBotones+'px'});
													break;
				}

			}
		};
		
		//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*opts.tam_navegacion)-64)/(opts.frame_width+frame_margin)):Math.min(item_count,opts.filmstrip_size);
			
			// Ajustar el número de miniaturas a mostrar
			if (opts.miniaturas_a_mostrar >0 && strip_size > opts.miniaturas_a_mostrar) strip_size = opts.miniaturas_a_mostrar
			
			/************************************************/
			/*	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));
			
			/************************************************/
			/*	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 = {
		filmstrip_size: 3,
		transition_speed: 400,
		transition_interval: 3000,
		anchoBotones: 20,
		nav_theme: 'dark',
		posicion_navegacion: 'center',
		tam_navegacion: 0.5,
		easing: 'swing',
		show_captions: false,
		fade_panels: true,
		pause_on_hover: true,
		miniaturas_a_mostrar: 0
	};
})(jQuery);