/*
* Author:      Marco Kuiper (http://www.marcofolio.net/)
*/
var $j = jQuery.noConflict();
$j(document).ready(function() {
		
	// Backwards navigation
	$j("#back").click(function() {
		stopAnimation();
		navigate("back");
	});
	
	// Forward navigation
	$j("#next_btn").click(function() {
		stopAnimation();
		navigate("next_btn");
	});
	
	var interval;
	$j("#control").toggle(function(){
		stopAnimation();
	}, function() {
		// Change the background image to "pause"
		$j(this).addClass("selected_pause").removeClass("selected_play");
		
		// Show the next_btn image
		navigate("next_btn");
		
		// Start playing the animation
		interval = setInterval(function() {
			navigate("next_btn");
		}, 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;
		}
		
		if(typeof(photos) != 'undefined') {
			// Check which current image we need to show
			if(direction == "next_btn") {
				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
		$j("#headerimg" + activeContainer).css({
			"background-image" : "url(" + photoObject.image + ")",
			"display" : "block",
			"z-index" : currentZindex
		});
		
		// Hide the header text
		$j("#headertxt").css({opacity: 0,left: '-1000px'});
		
		$j("#images_preload")
			.attr("href", photoObject.image)
		
		// Set the new header text
		$j("#firstline").html(photoObject.firstline);
		$j("#secondline")
			.html(photoObject.secondline);
		$j("#pictureduri")
			.attr("href", photoObject.url)
			.html(photoObject.title);
		
		$j("#firstline, #secondline, #pictureduri").each(function () {
			if ( $j(this).text() == "") { $j(this).addClass("empty"); } else { $j(this).removeClass("empty"); }
		})
		
		// Fade out the current container
		// and display the header text when animation is complete
		$j("#headerimg" + currentContainer).fadeOut(function() {
			setTimeout(function() {
				$j("#headertxt").animate({opacity: 1,left: '0px'}, "500");
				animating = false;
			}, 100);
		});
	};
	
	var stopAnimation = function() {
		// Change the background image to "play"
		$j("#control").addClass("selected_play").removeClass("selected_pause");
		
		// Clear the interval
		clearInterval(interval);
	};
	
	// We should statically set the first image
	navigate("next_btn");
	
	if(typeof(slideshowSpeed) != 'undefined') {
		// Start playing the animation
		interval = setInterval(function() {
			navigate("next_btn");
		}, slideshowSpeed);
	}
});