/*
* 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 = [ {
		"title" : "Stairs",
		"image" : "01.jpg",
		"url" : "http://www.sxc.hu/photo/1271909",
		"firstline" : "Going on",
		"secondline" : "vacation?"
	}, {
		"title" : "Office Appartments",
		"image" : "02.jpg",
		"url" : "http://www.sxc.hu/photo/1265695",
		"firstline" : "Or still busy at",
		"secondline" : "work?"
	}, {
		"title" : "Mountainbiking",
		"image" : "03.jpg",
		"url" : "http://www.sxc.hu/photo/1221065",
		"firstline" : "Get out and be",
		"secondline" : "active"
	}, {
		"title" : "Mountains Landscape",
		"image" : "04.jpg",
		"url" : "http://www.sxc.hu/photo/1042413",
		"firstline" : "Enjoy some delicious",
		"secondline" : "food"
	}
];



$(document).ready(function() {
		
	// Alberto navigation
	$("#p1").click(function() {
		stopAnimation();
		navigate("p1");
	});

	$("#p2").click(function() {
		stopAnimation();
		navigate("p2");
	});

	$("#p3").click(function() {
		stopAnimation();
		navigate("p3");
	});

	$("#p4").click(function() {
		stopAnimation();
		navigate("p4");
	});

	// 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;
			}
		} if (direction == "back") {
			currentImg--;
			if(currentImg == 0) {
				currentImg = photos.length;
			}
		}
		if (direction == "p1") {
			currentImg = 1;
			$("#p4").css({"background-image" : "url(images/nchosen.png)"});
			$("#p3").css({"background-image" : "url(images/nchosen.png)"});
			$("#p2").css({"background-image" : "url(images/nchosen.png)"});
			$("#p1").css({"background-image" : "url(images/chosen.png)"});
		}
		if (direction == "p2") {
			currentImg = 2;
			$("#p4").css({"background-image" : "url(images/nchosen.png)"});
			$("#p3").css({"background-image" : "url(images/nchosen.png)"});
			$("#p2").css({"background-image" : "url(images/chosen.png)"});
			$("#p1").css({"background-image" : "url(images/nchosen.png)"});
		}

		if (direction == "p3") {
			currentImg = 3;
			$("#p4").css({"background-image" : "url(images/nchosen.png)"});
			$("#p3").css({"background-image" : "url(images/chosen.png)"});
			$("#p2").css({"background-image" : "url(images/nchosen.png)"});
			$("#p1").css({"background-image" : "url(images/nchosen.png)"});
		}

		if (direction == "p4") {
			currentImg = 4;
			$("#p4").css({"background-image" : "url(images/chosen.png)"});
			$("#p3").css({"background-image" : "url(images/nchosen.png)"});
			$("#p2").css({"background-image" : "url(images/nchosen.png)"});
			$("#p1").css({"background-image" : "url(images/nchosen.png)"});
		}

		
		// Check which container we need to use
		var currentContainer = activeContainer;
		if(activeContainer == 1) {
			activeContainer = 2;
		} else {
			activeContainer = 1;
		}
		
		showImage(photos[currentImg - 1], currentContainer, activeContainer, currentImg);
		
	};
	
	var currentZindex = -1;
	var showImage = function(photoObject, currentContainer, activeContainer, photos) {
		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 + ")",
			"display" : "block",
			"z-index" : currentZindex
		}, 500);
		
		$("#p" + photos).css({"background-image" : "url(images/chosen.png)",});
		$("#p" + (photos-1)).css({"background-image" : "url(images/nchosen.png)",});
		
		$("#p" + (photos+3)).css({"background-image" : "url(images/nchosen.png)",});
		
		
		
		
		
		// Fade out the current container
		// and display the header text when animation is complete
		$("#headerimg" + currentContainer).fadeOut(1000, function () {
			setTimeout(function() {
				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("p1");
	
	// Start playing the animation
	interval = setInterval(function() {
		navigate("next") 	}, slideshowSpeed);
	
});