// Pictures
var photos = [ {
		"image" : "/sites/all/themes/longwaydown/images/titles/title_5.png"
	}, {
		"image" : "/sites/all/themes/longwaydown/images/titles/title_1.png"
	}, {
		"image" : "/sites/all/themes/longwaydown/images/titles/title_2.png"
	}, {
		"image" : "/sites/all/themes/longwaydown/images/titles/title_3.png"
	}, {
		"image" : "/sites/all/themes/longwaydown/images/titles/title_4.png"
	}
];

// Preload all images
(function($) {
  var cache = [];
  // Arguments are image paths relative to the current page.
  $.preLoadImages = function() {
    var args_len = photos.length;
    for (var i = args_len; i--;) {
      var cacheImage = document.createElement('img');
      cacheImage.src = photos[i].image;
      cache.push(cacheImage);
    }
  }
})(jQuery)

jQuery.preLoadImages();

$(document).ready(function() {
	var interval;
	var activeContainer = 1;	
	var currentImg = 0;
	var animating = false;
	var navigate = function(direction) {
		// Select next image
		currentImg++;
		if(currentImg == photos.length + 1) {
			currentImg = 1;
		}
		
		// 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 + ")",
			"display" : "block",
			"z-index" : currentZindex
		});
		
		// Fade out the current container
		$("#headerimg" + currentContainer).fadeOut(1000, function() {
			setTimeout(function() {
				animating = false;
			}, 500);
		});
	};
	
	// We should statically set the first image
	navigate("next");
	
	// Start playing the animation
	interval = setInterval(function() {
		navigate("next");
	}, 6000);
});