// JavaScript Document
// Written by Chris Converse
// for Lynda.com
var marqueeTimeout = null;

$(document).ready(function(){

	// Generate Navigation links
	$('.marquee_panels .marquee_panel').each(function(index){
		$('.marquee_nav').append('<a class="marquee_nav_item"></a>');
	});
	
	// Generate Photo Lineup
	$('img.marquee_panel_photo').each(function(index){
		var photoWidth = $('.marquee_container').width();
		var photoPosition = index * photoWidth;
		$('.marquee_photos').append('<img class="marquee_photo" style="left: '+photoPosition+'" src="'+$(this).attr('src')+'" alt="'+$(this).attr('alt')+'" width="620" height="350" />');
		$('.marquee_photos').css('width', photoPosition+photoWidth);
	});

	// Set up Navigation Links
	$('.marquee_nav a.marquee_nav_item').click(function(){
		clearTimeout(marqueeTimeout);
		// Set the navigation state
		$('.marquee_nav a.marquee_nav_item').removeClass('selected');
		$(this).addClass('selected');
		
		var navClicked = $(this).index();
		var marqueeWidth = $('.marquee_container').width();
		var distanceToMove = marqueeWidth*(-1);
		var newPhotoPosition = navClicked*distanceToMove + 'px';
		var newCaption = $('.marquee_panel_caption').get(navClicked);
		
		// Animate the photos and caption
		$('.marquee_photos').animate({left: newPhotoPosition}, 1000);
		$('.marquee_caption').animate({top: '340px'}, 500, function(){
			var newHTML = $(newCaption).html();
			$('.marquee_caption_content').html(newHTML);
			setCaption();
		});
	});
	
	// Preload all images, then initialize marquee
	$('.marquee_panels img').imgpreload(function(){
		initializeMarquee();
	});

	activeMarqueePage = 0;
	marqueeTimeout = setTimeout(function(){ animateMarquee(); }, 10000);
});

function animateMarquee()
{
	activeMarqueePage++;
	if(activeMarqueePage == 4)
	{
		activeMarqueePage = 0;
	}
	$(".marquee_nav a.marquee_nav_item").each(function(i){
		if(i==activeMarqueePage)
		{
			$(this).click();
		}
	});
	marqueeTimeout = setTimeout(function(){ animateMarquee(); }, 10000);
}

function initializeMarquee(){
	$('.marquee_caption_content').html(
		$('.marquee_panels .marquee_panel:first .marquee_panel_caption').html()
	);
	$('.marquee_nav a.marquee_nav_item:first').addClass('selected');
	$('.marquee_photos').fadeIn(1500);
	setCaption();
}

function setCaption(){
	var captionHeight = $('.marquee_caption').height();
	var marqueeHeight = $('.marquee_container').height();
	var newCaptionTop = marqueeHeight - captionHeight - 15;
	$('.marquee_caption').delay(100).animate({top: newCaptionTop}, 500);
}