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

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

// Variable to store the images we need to set as background
// which also includes some text and url's.
var photos = [];

$(document).ready(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('/media/" + photoObject.image + "')",
			"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);

});