/*
* 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.

$(document).ready(function() {

  if(typeof photos != "undefined") { 
		
	// 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(/components/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;

  /* Function: navigate
   *
   */
	var navigate = function(direction) {
		// Check if no animation is running. If it is, prevent the action
		if(animating) {
			return;
		}


    $("#slidepage"+(currentImg-1)).removeClass('active');

		// Check which current image we need to show
		if(direction == "next") {
			currentImg++;
			if(currentImg == photos.length + 1) {
				currentImg = 1;
			}
		} else if (direction == "back") {
			currentImg--;
			if(currentImg == 0) {
				currentImg = photos.length;
			}
		} else {
      // direction is not next or back, so imageNumber is passed
      currentImg = direction+1;
    }

    $("#slidepage"+(currentImg-1)).addClass('active');
		
		// 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 = 999;

  /* Function: showImage
   *
   */
	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
		});
		
		// 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"});
        $("#headertxt").css({"z-index" : currentZindex+1});
				animating = false;
			}, 500);
		});
	};

  /* Function: stopAnimation
   *
   */	
	var stopAnimation = function() {
		// Change the background image to "play"
		$("#control").css({ "background-image" : "url(/components/images/btn_play.png)" });
		
		// Clear the interval
		clearInterval(interval);
	};
	
	// We should statically set the first image
	navigate("next");

  // Build paging
  var slidelist = $("#slideshow_paging");
  $.each(
    photos, 
    function( intIndex, objValue ){
  
      // Create a new LI HTML element out of the
      // current value (in the iteration) and then
      // add this value to the list.
      slidelist.append( '<a href="#backgroundimageslideshow" class="pagingno" id="slidepage'+intIndex+'">'+(intIndex+1)+'</a>' );

      // Generate funtion for this slide
      $("#slidepage"+intIndex).click(function() {
        stopAnimation();
        navigate(intIndex);
      });
    }
  );  
	
	// Start playing the animation
	interval = setInterval(function() {
		navigate("next");
	}, slideshowSpeed);
  }	
});