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

Event.observe(window, 'load', function() {
	(function($) {
		
		// Backwards navigation
		$("#back").click(function() {
			stopAnimation();
			navigate("back");
		});
	
		// Forward navigation
		$("#next").click(function() {
			stopAnimation();
			navigate("next");
		});
	
		var interval;
		$("#control").toggle(function(){
			stopAnimation();
		}, function() {
			// Change the background image to "pause"
			$(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) {
			// 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 = -1;
		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
			$("#headerimg" + activeContainer).css({
				"background-image" : "url(" + photoObject.image + ")",
				"background-color" : photoObject.bgcolor,
				"display" : "block",
				"z-index" : currentZindex
			});
		
			// Hide the header text
			$("#headertxt").css({"display" : "none"});
		
			// Set the new header text
			//$("#firstline").html(photoObject.firstline);
			$("#secondline")
				.attr("href", photoObject.url)
				.html(photoObject.secondline);
			/*$("#pictureduri")
				.attr("href", photoObject.url)
				.html(photoObject.title);*/
		
		
			// Fade out the current container
			// and display the header text when animation is complete
			$("#headerimg" + currentContainer).fadeOut(function() {
				setTimeout(function() {
					$("#headertxt").css({"display" : "block"});
					animating = false;
				}, 500);
			});
		};
	
		var stopAnimation = function() {
			// Change the background image to "play"
			$("#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);
	
	})(jQuery);
});