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

// Speed of the automatic slideshow
var slideshowSpeed = 8000;

// Variable to store the images we need to set as background
// which also includes some text and url's.
var photos = [ {
		"title" : "",
		"image" : "bgBody.jpg",
		"url" : "",
		"firstline" : "<h2>Palazzo Farnese, <a href=\"http://www.piacenzamusei.it/index/it/attrazioni/show/palazzo-farnese/.html\">Sede dei Musei Civici di Palazzo Farnese</a></h2>",
		"secondline" : "vacation?"
	}, {
		"title" : "",
		"image" : "bgBody1.jpg",
		"url" : "",
		"firstline" : "<h2>Basilica di Sant'Antonino, <a href=\"http://www.piacenzamusei.it/index/it/attrazioni/show/basilica-di-s-antonino/.html\">Sede del Museo Capitolare di Sant'Antonino</a></h2>",
		"secondline" : "work?"
	}, {
		"title" : "",
		"image" : "bgBody2.jpg",
		"url" : "",
		"firstline" : "<h2>Castell'Arquato, Rocca Viscontea, <a href=\"http://www.piacenzamusei.it/index/it/attrazioni/show/rocca-viscontea/.html\">Sede del Museo della Rocca</a></h2>",
		"secondline" : "work?"
	}, {
		"title" : "",
		"image" : "bgBody3.jpg",
		"url" : "",
		"firstline" : "<h2>Piacenza, Piazza Cavalli</h2>",
		"secondline" : "work?"
	}, {
		"title" : "",
		"image" : "bgBody4.jpg",
		"url" : "",
		"firstline" : "<h2>Bobbio, Ponte Gobbo</h2>",
		"secondline" : "work?"
	}, {
		"title" : "",
		"image" : "bgBody5.jpg",
		"url" : "",
		"firstline" : "<h2><a href=\"http://www.piacenzamusei.it/index/it/attrazioni/show/rocca-d-olgisio/.html\">Rocca d'Olgisio</a>, veduta aerea</h2>",
		"secondline" : "work?"
	}, {
		"title" : "",
		"image" : "bgBody6.jpg",
		"url" : "",
		"firstline" : "<h2><a href=\"http://www.piacenzamusei.it/index/it/attrazioni/show/castello-di-rivalta/.html\">Castello di Rivalta</a>, veduta dal fiume Trebbia</h2>",
		"secondline" : "work?"
	}, {
		"title" : "",
		"image" : "bgBody7.jpg",
		"url" : "",
		"firstline" : "<h2><a href=\"http://www.piacenzamusei.it/index/it/attrazioni/show/abbazia-di-chiaravalle-della-colomba/.html\">Abbazia di Chiaravalle della Colomba</a>, chiostro</h2>",
		"secondline" : "work?"
	}, {
		"title" : "",
		"image" : "bgBody8.jpg",
		"url" : "",
		"firstline" : "<h2><a href=\"http://www.piacenzamusei.it/index/it/pagine/pinacoteca-33/musei-civici-di-palazzo-farnese/.html\">Madonna adorante il figlio, Botticelli, Palazzo Farnese</a></h2>",
		"secondline" : "work?"
	}
	
];



$(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(images/grafica/" + photoObject.image + ")",
			"display" : "block",
			"z-index" : currentZindex
		});
		
		// Hide the header text
		//$("#descrizione_header").css({"display" : "none"});
		$("#descrizione_header").fadeOut(function() {
			$("#descrizione_header").html(photoObject.firstline);
		});
		// Set the new header text
		
		/*$("#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
		$("#headerimg" + currentContainer).fadeOut(1000, function() {
			setTimeout(function() {
				//$("#descrizione_header").css({"display" : "block"});
				$("#descrizione_header").fadeIn();
				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);
	
});