var $jq 			= jQuery.noConflict();

/*
* Author:      Marco Kuiper (http://www.marcofolio.net/)
*/

// Speed of the automatic slideshow
var slideshowSpeed = 6000;

$jq(document).ready(function() {
	// Backwards navigation
	$jq("#back").click(function() {
		stopAnimation();
		navigate("back");
	});
	
	// Forward navigation
	$jq("#next").click(function() {
		stopAnimation();
		navigate("next");
	});
	
	var interval;
	$jq("#control").toggle(function(){
		stopAnimation();
	}, function() {
		// Change the background image to "pause"
		$jq(this).css({ "background-image" : "url(images/btn_pause.png)" });
		
		// Show the next image
		navigate("next");
		
		// Start playing the animation
		interval = setInterval(function() {
			navigate("next");
		}, slideshowSpeed);
	});
	
	
	var activeContainer = 1;	
	var currentImg = 0;
	var animating = false;
	var navigate = function(direction) {
		if(photos && photos.length){
			// Check if no animation is running. If it is, prevent the action
			if(animating) {
				return;
			}
			
			// Check which current image we need to show
			if(direction == "next") {
				currentImg++;
				if(currentImg == photos.length + 1) {
					currentImg = 1;
				}
			} else {
				currentImg--;
				if(currentImg == 0) {
					currentImg = photos.length;
				}
			}
			
			// Check which container we need to use
			var currentContainer = activeContainer;
			if(activeContainer == 1) {
				activeContainer = 2;
			} else {
				activeContainer = 1;
			}
			showImage(photos[currentImg - 1], currentContainer, activeContainer);
		}
	};
	
	var currentZindex = 1000;
	var showImage = function(photoObject, currentContainer, activeContainer) {
		animating = true;
		
		// Make sure the new container is always on the background
		currentZindex--;
		
		// Set the background image of the new active container
		var atual = $jq("#headerimg" + activeContainer);
		atual.css({
			"background-image" : "url(" + photoObject.image + ")",
			"display" : "block",
			"z-index" : currentZindex
		});
		atual.parent().attr('href',photoObject.url)
		
		// Hide the header text
		$jq("#headertxt").css({"display" : "none"});
		
		// Set the new header text
		$jq("#firstline").html(photoObject.firstline);
		$jq("#secondline")
			.attr("href", photoObject.url)
			.html(photoObject.secondline);
		$jq("#pictureduri")
			.attr("href", photoObject.url)
			.html(photoObject.title);
		
		
		// Fade out the current container
		// and display the header text when animation is complete
		$jq("#headerimg" + currentContainer).fadeOut(function() {
			setTimeout(function() {
				$jq("#headertxt").css({"display" : "block"});
				animating = false;
			}, 500);
		});
	};
	
	var stopAnimation = function() {
		// Change the background image to "play"
		$jq("#control").css({ "background-image" : "url(images/btn_play.png)" });
		
		// Clear the interval
		clearInterval(interval);
	};
	
	// We should statically set the first image
	navigate("next");
	
	// Start playing the animation
	interval = setInterval(function() {
		navigate("next");
	}, slideshowSpeed);
	
});