/*

Title:		jShowOff: a jQuery Content Rotator Plugin
Author:		Erik Kallevig
Version:	0.1.1
Website:	http://ekallevig.com/jshowoff
License: 	Dual licensed under the MIT and GPL licenses.

jShowOff Options

speed : 		time each slide is shown [integer, milliseconds, defaults to 3000]
changeSpeed : 	speed of transition [integer, milliseconds, defaults to 600]
controls : 		whether to create & display controls (Previous, Next, Play/Pause) [boolean, defaults to true]
links : 		whether to create & display numeric links to each slide [boolean, defaults to true]
autoPlay : 		whether to start playing immediately [boolean, defaults to true]
cssClass :		custom class to add to .jshowoff wrapper [string]


Luke Lowrey: luke@chamsys.co.uk

Modified the code to work with divs inside each frame, as originally it screwed them up in the gallery *.remove stage.
Each content slide div has its own class (rotatoritem).
The encapsulating div is now hard coded into the source (rotatoritems). This was because cufon was screwing up when copying the divs across
and was failing to render the styling, so now the items are faded in-situ, rather than being cloned first.


*/

(function($) {


	$.fn.jshowoff = function(settings) {

		// default variable values
		var config = {
			speed : 3000,
			changeSpeed : 1000,
			controls : true,
			links : true,
			autoPlay : true
		};
		
		// merge default variables with custom variables, modifying 'config'
		if (settings) $.extend(config, settings);

		// make sure speed is at least 20ms longer than changeSpeed
		if (config.speed < (config.changeSpeed+20)) {
			alert('jShowOff: Make speed at least 20ms longer than changeSpeed; the fades aren\'t always right on time.');
			return this;
		};
		
		// create slideshow for each matching element invoked by jshowoff()
		this.each(function(i) {
			
			// invoke variables
			var cont = this;
			var gallery = $(this).children('div.rotatoritems').children();//.remove();
			var timer = '';
			var counter = 0;
			var preloaded = [];
			var howManyInstances = $('.jshowoff').length+1;
			var cssClass = config.cssClass !== undefined ? 'jshowoff-custom-'+howManyInstances+' '+config.cssClass : 'jshowoff-'+howManyInstances;
			var uniqueClass = cssClass.split(' ')[0];
			
			// set up rotator and start playing
			function start() {
				
				// add .jshowoff wrapper inside container
				//$(cont).css('position','relative').append('<div class="jshowoff '+cssClass+'"></div>');
				$(cont).children('div.rotatoritems').addClass('jshowoff '+cssClass);
				
				gallery = $('.' + cssClass + ' div.rotatoritem');//.remove();
				
				// copy slides, then add to wrapper
				//$(gallery[0]).clone().appendTo('.'+uniqueClass);
				
				// preload slide images
				preload();
				
				// add controls
			//	if(config.controls){ addControls(); if(config.autoPlay==false){ $('.'+uniqueClass+'-play').addClass(uniqueClass+'-paused jshowoff-paused').text('Play'); } }
				
				// add links
				if(config.links){ addLinks(); $('.'+uniqueClass+'-slidelinks a').eq(0).addClass(uniqueClass+'-active jshowoff-active'); }
				
				// load slides into hidden 'cache' div
				//$('<div class="'+uniqueClass+'-cache jshowoff-cache"></div>').appendTo(cont);
//				$(gallery).each(function(){$(this).appendTo($('.'+uniqueClass+'-cache')).hide();});
				$(gallery).each(  function(i){ if(i > 0){$(this).hide();}  }  );
				
				
				transitionTo(gallery, 0);
				
				// determine autoPlay
				if(config.autoPlay && gallery.length>1) { timer = setTimeout( function(){play();}, config.speed ); };
				
				// display error message if no slides present
				if(gallery.length<1){ $('.'+uniqueClass).append('<p>For the banner to work, you must have at least one item</p>'); }
				
			};
			
			// utility for loading 'slides'
			function transitionTo(gallery,index) {
				if((counter >= gallery.length) || (index >= gallery.length)) { counter = 0; }
				else if((counter < 0) || (index < 0)) { counter = gallery.length-1; }
				else { counter = index; }
				
				//alert($('.'+uniqueClass+' .jshowoff-active-panel').length);
				if($('.'+uniqueClass+' .jshowoff-active-panel').length >= 1){
					$('.'+uniqueClass+' .jshowoff-active-panel').fadeOut(config.changeSpeed,function(){ });
					$('.'+uniqueClass+' .jshowoff-active-panel').removeClass('jshowoff-active-panel');
				};
				
				$(gallery[counter]).fadeIn(config.changeSpeed);
				$(gallery[counter]).addClass('jshowoff-active-panel');	
				
				// update active class on slide link
				if(config.links){
					$('.'+uniqueClass+'-active').removeClass(uniqueClass+'-active jshowoff-active');
					$('.'+uniqueClass+'-slidelinks a').eq(counter).addClass(uniqueClass+'-active jshowoff-active');
				}
			};
			
			// generate and add play/pause, prev, next controls
			function addControls() {
				$(cont).append('<p class="jshowoff-controls '+uniqueClass+'-controls"><a class="jshowoff-play '+uniqueClass+'-play" href="#null">Pause</a> <a class="jshowoff-prev '+uniqueClass+'-prev" href="#null">Previous</a> <a class="jshowoff-next '+uniqueClass+'-next" href="#null">Next</a></p>');
				$('.'+uniqueClass+'-controls a').each(function(){

						if($(this).hasClass('jshowoff-play')) $(this).click(function(){ updatePlayPause(); return false; } );
						if($(this).hasClass('jshowoff-prev')) $(this).click(function(){ previous(); return false; });
						if($(this).hasClass('jshowoff-next')) $(this).click(function(){ next(); return false; });
	
				});
			};

			// modify play/pause button text/event depending on state
			function updatePlayPause() {
				if(isPlaying()){ pause(); $('.'+uniqueClass+'-play').text('Play').toggleClass('jshowoff-paused '+uniqueClass+'-paused'); }
				else { play(); $('.'+uniqueClass+'-play').text('Pause').toggleClass('jshowoff-paused '+uniqueClass+'-paused'); };
			};
			
			// is the rotator currently in 'play' mode
			function isPlaying(){
				if($('.'+uniqueClass+'-play').hasClass('jshowoff-paused')){ return false; }
				else { return true; };
			};
			
			// start rotating slides on a specified interval
			function play() {
				
				if(!isBusy()){
					counter++;
					transitionTo(gallery,counter);
					clearTimeout(timer);
					timer = setTimeout(function(){ play(gallery); },config.speed);
				}
			};
			
			// stop auto rotation & invoke pause animation
			function pause() {
				clearTimeout(timer);
				$('<p class="'+uniqueClass+'-pausetext">Pause</p>').css({ fontSize:'62%', color:'#fff', textAlign:'center', position:'absolute', top:'40%', lineHeight:'100%', width:'100%' }).appendTo('.'+uniqueClass).animate({ fontSize:'600%', top:'30%', opacity:0 }, {duration:400,complete:function(){$(this).remove();}});
			};
			
			// stop auto rotation
			function stopit() {
				clearTimeout(timer);
			};
			
			// load the next slide
			function next() {
				goToAndPause(counter+1);
			};
		
			// load the previous slide
			function previous() {
				goToAndPause(counter-1);
			};
			
			
			// is the rotator in mid-transition
			function isBusy() {
				return $('.'+uniqueClass+' div.banneritem').length>1 ? true : false;
			};
			
			// load a specific slide
			function goToAndPause(index) {
				$('.'+uniqueClass+' div.banneritem').stop(true);
				stopit();
				$('.'+uniqueClass+'-play').text('Play').addClass('jshowoff-paused '+uniqueClass+'-paused');
				if((counter != index) || ((counter == index) && isBusy())){
					if(isBusy()) $('.'+uniqueClass+' div.banneritem').remove();
					transitionTo(gallery,index);
				}
			};
			
			// generate and add slide links
			function addLinks() {
				$(cont).append('<p class="jshowoff-slidelinks '+uniqueClass+'-slidelinks"></p>');
				$.each(gallery, function(i, val) {
					$('<a class="jshowoff-slidelink-'+i+' '+uniqueClass+'-slidelink-'+i+'" href="#null">'+(i+1)+'</a>').bind('click', {index:i}, function(e){ goToAndPause(e.data.index); return false; }).appendTo('.'+uniqueClass+'-slidelinks');
				});
			};			

			function preload() {
				$(gallery).each(function(i){
					$(this).find('img').each(function(i){
						preloaded[i] = $('<img>').attr('src',$(this).attr('src'));					
					});
				});
			};
			
			start();	
	
	
	
		// end .each
		});
	
		return this;

	// end .jshowoff
	};

// end closure
})(jQuery);