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

// Variable to store the img we need to set as background
var photos = [ {
		"image" : "photo_01.jpg"
	}, {
		"image" : "photo_02.jpg"
	}, {
		"image" : "photo_03.jpg"
	}, {
		"image" : "photo_04.jpg"
	}, {
		"image" : "photo_05.jpg"
	}
];

$(document).ready(function() {
	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(img/" + photoObject.image + ")",
			"display" : "block",
			"z-index" : currentZindex
		});
		
		// Fade out the current container
		$("#headerimg" + currentContainer).fadeOut(4000 , function() {
			setTimeout(function() {
				$("#headertxt").css({"display" : "block"});
				animating = false;
			}, 6000);
		});
	};
		
	// We should statically set the first image
	navigate("next");
	
	// Start playing the animation
	interval = setInterval(function() {
		navigate("next");
	}, 100);
	
});