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

// Speed of the automatic slideshow
var slideshowSpeed = 10000;

var photos = [ {
		"image" : "header/green.jpg"
	}, {
		"image" : "header/blue.jpg"
	}, {
		"image" : "header/orange.jpg"
	}, {
		"image" : "header/purple.jpg"
	}, {
		"image" : "header/grey.jpg"
	}
];


$(document).ready(function() {
	
	
	var interval;

	
	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(/images/" + photoObject.image + ")",
			"background-position" : "center center",
			"display" : "block",
			"z-index" : currentZindex
		});

		$("#footimg" + activeContainer).css({
			"background-image" : "url(/images/" + photoObject.image + ")",
			"background-position" : "center center",
			"display" : "block",
			"z-index" : currentZindex
		});		


		
		// Fade out the current container
		// and display the header text when animation is complete
		$("#headerimg" + currentContainer).fadeOut(3000);

		$("#footimg" + currentContainer).fadeOut(3000);

	};
	
	navigate("next")
	
	// Start playing the animation
	interval = setInterval(function() {
		navigate("next");
	}, slideshowSpeed);
	
	
	$('header').css({"background-image" : "none"});

	
});