/**
 *	ImageFlow 0.9 modified to work with Lightbox 
 *
 *    This is a combination of the ImageFlow gallery with Lightbox pop-ups when linking to an image.
 *    Copyright Bev Stofko 
 *
 *    Original ImageFlow 0.9 Comments-----------------------------:
 *	This code is based on Michael L. Perrys Cover flow in Javascript.
 *	For he wrote that "You can take this code and use it as your own" [1]
 *	this is my attempt to improve some things. Feel free to use it! If
 *	you have any questions on it leave me a message in my shoutbox [2].
 *
 *	The reflection is generated server-sided by a slightly hacked  
 *	version of Richard Daveys easyreflections [3] written in PHP.
 *	
 *	The mouse wheel support is an implementation of Adomas Paltanavicius
 *	JavaScript mouse wheel code [4].
 *
 *	Thanks to Stephan Droste ImageFlow is now compatible with Safari 1.x.
 *    --------------------------------------------------------------
 *
 *
 *	[1] http://www.adventuresinsoftware.com/blog/?p=104#comment-1981
 *	[2] http://shoutbox.finnrudolph.de/
 *	[3] http://reflection.corephp.co.uk/v2.php
 *	[4] http://adomas.org/javascript-mouse-wheel/
 */


/* Configuration variables */
var conf_reflection_p = 0.5;         // Sets the height of the reflection in % of the source image 
var conf_focus = 4;                  // Sets the numbers of images on each side of the focussed one
var conf_wpif2_slider_width = 14;          // Sets the px width of the slider div
var conf_wpif2_images_cursor = 'pointer';  // Sets the cursor type for all images default is 'default'
var conf_wpif2_slider_cursor = 'default';  // Sets the slider cursor type: try "e-resize" default is 'default'

/* HTML div ids that we manipulate here */
var wpif2_imageflowdiv     = 'wpif2_imageflow';
var wpif2_loadingdiv       = 'wpif2_loading';
var wpif2_imagesdiv        = 'wpif2_images';
var wpif2_captionsdiv      = 'wpif2_captions';
var wpif2_sliderdiv        = 'wpif2_slider';
var wpif2_scrollbardiv     = 'wpif2_scrollbar';
var wpif2_overlaydiv       = 'wpif2_overlay';
var wpif2_overlayclosediv  = 'wpif2_overlayclose';
var wpif2_topboxdiv        = 'wpif2_topbox';
var wpif2_topboximgdiv     = 'wpif2_topboximg';
var wpif2_topboxcaptiondiv = 'wpif2_topboxcaption';
var wpif2_topboxclosediv   = 'wpif2_topboxclose';

/* Define global variables */
var caption_id = 0;
var new_caption_id = 0;
var current = 0;
var target = 0;
var mem_target = 0;
var timer = 0;
var array_images = new Array();
var new_slider_pos = 0;
var dragging = false;
var dragobject = null;
var dragx = 0;
var posx = 0;
var new_posx = 0;
var xstep = 150;


function step()
{
	switch (target < current-1 || target > current+1) 
	{
		case true:
			moveTo(current + (target-current)/3);
			window.setTimeout(step, 50);
			timer = 1;
			break;

		default:
			timer = 0;
			break;
	}
}

function glideTo(x, new_caption_id)
{	
	/* Animate gliding to new x position */
	target = x;
	mem_target = x;
	if (timer == 0)
	{
		window.setTimeout(step, 50);
		timer = 1;
	}
	
	/* Display new caption */
	caption_id = new_caption_id;
	caption = img_div.childNodes.item(array_images[caption_id]).getAttribute('alt');
	if (caption == '') caption = '&nbsp;';
	caption_div.innerHTML = caption;

	/* Set scrollbar slider to new position */
	if (dragging == false)
	{
		new_slider_pos = (scrollbar_width * (-(x*100/((max-1)*xstep))) / 100) - new_posx;
		slider_div.style.marginLeft = (new_slider_pos - conf_wpif2_slider_width) + 'px';
	}
}

function moveTo(x)
{
	current = x;
	var zIndex = max;
	
	/* Main loop */
	for (var index = 0; index < max; index++)
	{
		var image = img_div.childNodes.item(array_images[index]);
		var current_image = index * -xstep;

		/* Don't display images that are not conf_focussed */
		if ((current_image+max_conf_focus) < mem_target || (current_image-max_conf_focus) > mem_target)
		{
			image.style.visibility = 'hidden';
			image.style.display = 'none';
		}
		else 
		{
			var z = Math.sqrt(10000 + x * x) + 100;
			var xs = x / z * size + size;

			/* Still hide images until they are processed, but set display style to block */
			image.style.display = 'block';
		
			/* Process new image height and image width */
			var new_img_h = (image.h / image.w * image.pc) / z * size;
			switch ( new_img_h > max_height )
			{
				case false:
					var new_img_w = image.pc / z * size;
					break;

				default:
					new_img_h = max_height;
					var new_img_w = image.w * new_img_h / image.h;
					break;
			}
			var new_img_top = (images_width * 0.34 - new_img_h) + images_top + ((new_img_h / (conf_reflection_p + 1)) * conf_reflection_p);

			/* Set new image properties */
			image.style.left = xs - (image.pc / 2) / z * size + images_left + 'px';
			if(new_img_w && new_img_h)
			{ 
				image.style.height = new_img_h + 'px'; 
				image.style.width = new_img_w + 'px'; 
				image.style.top = new_img_top + 'px';
			}
			image.style.visibility = 'visible';

			/* Set image layer through zIndex */
			switch ( x < 0 )
			{
				case true:
					zIndex++;
					break;

				default:
					zIndex = zIndex - 1;
					break;
			}
			
			/* Change zIndex and onclick function of the focussed image */
			switch ( image.i == caption_id )
			{
				case false:
					image.onclick = function() { glideTo(this.x_pos, this.i); }
					break;

				default:
					zIndex = zIndex + 1;
  					if (image.getAttribute("rel") && (image.getAttribute("rel") == 'wpif2_lightbox')) {
						image.setAttribute("title",image.getAttribute('alt'));
						image.onclick = function () { showTop(this);return false; }
					} else {
						image.onclick = function() { window.open (this.url); }
					}
					break;
			}
			image.style.zIndex = zIndex;
		}
		x += xstep;
	}
}

/* Main function */
function refresh(onload)
{
	/* Cache document objects in global variables */
	imageflow_div = document.getElementById(wpif2_imageflowdiv);
	img_div = document.getElementById(wpif2_imagesdiv);
	scrollbar_div = document.getElementById(wpif2_scrollbardiv);
	slider_div = document.getElementById(wpif2_sliderdiv);
	caption_div = document.getElementById(wpif2_captionsdiv);

	/* Cache global variables, that only change on refresh */
	images_width = img_div.offsetWidth;
	images_top = imageflow_div.offsetTop;
	images_left = imageflow_div.offsetLeft;

	max_conf_focus = conf_focus * xstep;
	size = images_width * 0.5;
	scrollbar_width = images_width * 0.6;
	conf_wpif2_slider_width = conf_wpif2_slider_width * 0.5;
	max_height = images_width * 0.51;

	/* Change imageflow div properties */
	imageflow_div.style.height = max_height + 'px';

	/* Change images div properties */
	img_div.style.height = images_width * 0.338 + 'px';

	/* Change captions div properties */
	caption_div.style.width = images_width + 'px';
	caption_div.style.marginTop = images_width * 0.03 + 'px';

	/* Change scrollbar div properties */
	scrollbar_div.style.marginTop = images_width * 0.02 + 'px';
	scrollbar_div.style.marginLeft = images_width * 0.2 + 'px';
	scrollbar_div.style.width = scrollbar_width + 'px';
	
	/* Set slider attributes */
	slider_div.onmousedown = function () { dragstart(this); };
	slider_div.style.cursor = conf_wpif2_slider_cursor;

	/* Cache EVERYTHING! */
	max = img_div.childNodes.length;
	var i = 0;
	for (var index = 0; index < max; index++)
	{ 
		var image = img_div.childNodes.item(index);
		if ((image.nodeType == 1) && (image.nodeName != "NOSCRIPT"))
		{
			array_images[i] = index;
			
			/* Set image onclick by adding i and x_pos as attributes! */
			image.onclick = function() { glideTo(this.x_pos, this.i); }
			image.x_pos = (-i * xstep);
			image.i = i;
			
			/* Add width and height as attributes ONLY once onload */
			if(onload == true)
			{
				image.w = image.width;
				image.h = image.height;
			}

			/* Check source image format. Get image height minus reflection height! */
			switch ((image.w + 1) > (image.h / (conf_reflection_p + 1))) 
			{
				/* Landscape format */
				case true:
					image.pc = 118;
					break;

				/* Portrait and square format */
				default:
					image.pc = 100;
					break;
			}

			/* Set ondblclick event */
			image.url = image.getAttribute('longdesc');
			if (image.getAttribute("rel") && (image.getAttribute("rel") == 'wpif2_lightbox')) {
				image.setAttribute("title",image.getAttribute('alt'));
				image.ondblclick = function () { showTop(this);return false; }
			} else {
				image.ondblclick = function() { window.open (this.url); }
			}
			/* Set image cursor type */
			image.style.cursor = conf_wpif2_images_cursor;

			i++;
		}
	}
	max = array_images.length;

	/* Display images in current order */
	moveTo(current);
	glideTo(current, caption_id);
}

/* Show/hide element functions */
function show(id)
{
	var element = document.getElementById(id);
	element.style.visibility = 'visible';
}
function hide(id)
{
	var element = document.getElementById(id);
	element.style.visibility = 'hidden';
	element.style.display = 'none';
}

/* Show loading bar while page is loading */
document.observe("dom:loaded", loading);
function loading()
{
	show(wpif2_loadingdiv);

	/* set up onload function */
	if(typeof window.onload === "function")
	  {
		var oldonload = window.onload;
		window.onload = function()
		{
			loaded();
			oldonload();
		};
	} else window.onload = loaded;

	window.onunload = function(){
		/* Fixes the back button issue */
		document = null;
	}
}

/* Hide loading bar, show content and initialize mouse event listening after loading */
function loaded ()
{
      var objBody = $$('body')[0];

	objBody.appendChild(Builder.node('div',{id:wpif2_overlaydiv}, Builder.node('a',{id:wpif2_overlayclosediv, href: '#' })));
	
      objBody.appendChild(Builder.node('div',{id:wpif2_topboxdiv}, [
                Builder.node('img',{id:wpif2_topboximgdiv}), 
                Builder.node('div',{id:wpif2_topboxcaptiondiv}),
                Builder.node('a',{id:wpif2_topboxclosediv, href: '#' }) ]));

	close_div = document.getElementById(wpif2_topboxclosediv);
	close_div.onclick = function () { closeTop(); return false; };
	close_div.innerHTML = "Close";
	close2_div = document.getElementById(wpif2_overlayclosediv);
	close2_div.onclick = function () { closeTop(); return false; };
	close2_div.innerHTML = "Close";
		
	if(document.getElementById(wpif2_imageflowdiv))
	{
		hide(wpif2_loadingdiv);
		refresh(true);
		show(wpif2_imagesdiv);
		show(wpif2_scrollbardiv);
		initMouseWheel();
		initMouseDrag();
	}
}

/* Refresh ImageFlow on window resize */
window.onresize = function()
{
	if(document.getElementById(wpif2_imageflowdiv)) refresh();
}


/* Handle the wheel angle change (delta) of the mouse wheel */
function handle(delta)
{
	var change = false;
	switch (delta > 0)
	{
		case true:
			if(caption_id >= 1)
			{
				target = target + xstep;
				new_caption_id = caption_id - 1;
				change = true;
			}
			break;

		default:
			if(caption_id < (max-1))
			{
				target = target - xstep;
				new_caption_id = caption_id + 1;
				change = true;
			}
			break;
	}

	/* Glide to next (mouse wheel down) / previous (mouse wheel up) image */
	if (change == true)
	{
		glideTo(target, new_caption_id);
	}
}

/* Event handler for mouse wheel event */
function wheel(event)
{
	var delta = 0;
	if (!event) event = window.event;
	if (event.wheelDelta)
	{
		delta = event.wheelDelta / 120;
	}
	else if (event.detail)
	{
		delta = -event.detail / 3;
	}
	if (delta) handle(delta);
	if (event.preventDefault) event.preventDefault();
	event.returnValue = false;
}

/* Initialize mouse wheel event listener */
function initMouseWheel()
{
	if(window.addEventListener) imageflow_div.addEventListener('DOMMouseScroll', wheel, false);
	imageflow_div.onmousewheel = wheel;
}

/* This function is called to drag an object (= slider div) */
function dragstart(element)
{
	dragobject = element;
	dragx = posx - dragobject.offsetLeft + new_slider_pos;
}

/* This function is called to stop dragging an object */
function dragstop()
{
	dragobject = null;
	dragging = false;
}

/* This function is called on mouse movement and moves an object (= slider div) on user action */
function drag(e)
{
	posx = document.all ? window.event.clientX : e.pageX;
	if(dragobject != null)
	{
		dragging = true;
		new_posx = (posx - dragx) + conf_wpif2_slider_width;

		/* Make sure, that the slider is moved in proper relation to previous movements by the glideTo function */
		if(new_posx < ( - new_slider_pos)) new_posx = - new_slider_pos;
		if(new_posx > (scrollbar_width - new_slider_pos)) new_posx = scrollbar_width - new_slider_pos;
		
		var slider_pos = (new_posx + new_slider_pos);
		var step_width = slider_pos / ((scrollbar_width) / (max-1));
		var image_number = Math.round(step_width);
		var new_target = (image_number) * -xstep;
		var new_caption_id = image_number;

		dragobject.style.left = new_posx + 'px';
		glideTo(new_target, new_caption_id);
	}
}

/* Initialize mouse event listener */
function initMouseDrag()
{
	document.onmousemove = drag;
	document.onmouseup = dragstop;

	/* Avoid text and image selection while dragging  */
	document.onselectstart = function () 
	{
		if (dragging == true)
		{
			return false;
		}
		else
		{
			return true;
		}
	}
}

function getKeyCode(event)
{
	event = event || window.event;
	return event.keyCode;
}

document.onkeydown = function(event)
{
	var charCode  = getKeyCode(event);
	switch (charCode)
	{
		/* Right arrow key */
		case 39:
			handle(-1);
			break;
		
		/* Left arrow key */
		case 37:
			handle(1);
			break;
	}
}

function getPageScroll(){
	var xScroll, yScroll;
	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
		xScroll = self.pageXOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
		xScroll = document.documentElement.scrollLeft;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
		xScroll = document.body.scrollLeft;	
	}
	arrayPageScroll = new Array(xScroll,yScroll) 
	return arrayPageScroll;
}

function getPageSize(){
	var xScroll, yScroll;
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = window.innerWidth + window.scrollMaxX;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		if(document.documentElement.clientWidth){
			windowWidth = document.documentElement.clientWidth; 
		} else {
			windowWidth = self.innerWidth;
		}
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}
	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = xScroll;		
	} else {
		pageWidth = windowWidth;
	}
	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}

function showFlash(){
	var flashObjects = document.getElementsByTagName("object");
	for (i = 0; i < flashObjects.length; i++) {
		flashObjects[i].style.visibility = "visible";
	}
	var flashEmbeds = document.getElementsByTagName("embed");
	for (i = 0; i < flashEmbeds.length; i++) {
		flashEmbeds[i].style.visibility = "visible";
	}
}

function hideFlash(){
	var flashObjects = document.getElementsByTagName("object");
	for (i = 0; i < flashObjects.length; i++) {
		flashObjects[i].style.visibility = "hidden";
	}
	var flashEmbeds = document.getElementsByTagName("embed");
	for (i = 0; i < flashEmbeds.length; i++) {
		flashEmbeds[i].style.visibility = "hidden";
	}
}

function showTop(image)
{
	topbox_div = document.getElementById(wpif2_topboxdiv);
	overlay_div = document.getElementById(wpif2_overlaydiv);
	topboximg_div = document.getElementById(wpif2_topboximgdiv);

	// Hide flash objects
	hideFlash();

	// Show the background overlay ...
	var arrayPageSize = getPageSize();
	overlay_div.style.width = arrayPageSize[0] + "px";
	overlay_div.style.height = arrayPageSize[1] + "px";
	overlay_div.style.visibility = 'visible';

	// Get the top box data set up first
	topboximg_div.src = image.url;
	document.getElementById(wpif2_topboxcaptiondiv).innerHTML = image.getAttribute('title');

	// get the image actual size by preloading into 't'
	var t = new Image();
      t.onload = (function(){	showImg(image, t.width, t.height); });
	t.src = image.url;

	// Now wait until 't' is loaded
}


function showImg(image, img_width, img_height) 
{	
	// Do nothing if the overlay was closed in the meantime
	if (document.getElementById(wpif2_overlaydiv).style.visibility == 'hidden') return;
	
	// Go ahead with the fade up
	topbox_div = document.getElementById(wpif2_topboxdiv);
	overlay_div = document.getElementById(wpif2_overlaydiv);
	topboximg_div = document.getElementById(wpif2_topboximgdiv);

	// Size the box a bit taller than the image
	boxWidth = img_width;
	boxHeight = img_height + 30;

	// Set the image width property
	topboximg_div.width = boxWidth;

	var arrayPageSize = getPageSize();
	var screenWidth = arrayPageSize[2];
	var screenHeight = arrayPageSize[3];

	var arrayPageScroll = getPageScroll();

	// scale the box if the image is larger than the screen
	if (boxWidth > screenWidth) {
		boxHeight = Math.floor(boxHeight * screenWidth / boxWidth);
		boxWidth = screenWidth - 100;
		topboximg_div.width = boxWidth;
	}
	if (boxHeight > screenHeight) {
		boxWidth = Math.floor(boxWidth * screenHeight / boxHeight);
		boxHeight = screenHeight - 100;
		topboximg_div.width = boxWidth;
	}

	xPos = Math.floor((screenWidth - boxWidth) * 0.5) + arrayPageScroll[0];
	yPos = Math.floor((screenHeight - boxHeight) * 0.5) + arrayPageScroll[1];

	topbox_div.style.left = xPos + 'px';
	topbox_div.style.top = yPos + 'px';
	topbox_div.style.width = boxWidth + 'px';

	// Finally show the topbox...
	topbox_div.style.display = 'none';
	topbox_div.style.visibility = 'visible';
	new Effect.Appear(topbox_div, { from: 0.0, to: 1.0, duration: .4 });

}

function closeTop()
{
	//Hide the overlay and tobox...
	document.getElementById(wpif2_overlaydiv).style.visibility='hidden';
	document.getElementById(wpif2_topboxdiv).style.visibility='hidden';

	// Show hidden objects
	showFlash();
}