/**
 *	ImageFlow 0.9
 *
 *	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_slider_width = 14;          // Sets the px width of the slider div
var conf_images_cursor = 'pointer';  // Sets the cursor type for all images default is 'default'
var conf_slider_cursor = 'default';  // Sets the slider cursor type: try "e-resize" default is 'default'

/* Id names used in the HTML */
var conf_imageflow = 'imageflow';    // Default is 'imageflow'
var conf_loading = 'loadingWedding';        // Default is 'loading'
var conf_images = 'images';          // Default is 'images'
var conf_captions = 'captions';      // Default is 'captions'
var conf_scrollbar = 'scrollbar';    // Default is 'scrollbar'
var conf_slider = 'slider';          // Default is 'slider'

/* 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;

//ADDED
var currentCategory = 0;
var max_images = 0;
var preloadAnimTimer = false;
var enlargeTimer = false;
var enlargeImage = false;

var glideTimer = false;
var glideX = false;
var glideNew_caption_id = false;

var preloadImageIndex = 0;
var preloadActive = false;
var initialized = false;

var imageflow_div = '';
var img_div = '';
var scrollbar_div = '';
var slider_div = '';
var caption_div = '';
var imgPreload = '';

var overlayOpacity = 0.8;
var overlayDuration = 0.2;

var enlargedImage = '';
var enlargedArray = '';
var isEnlarged = false;
//***************
var debugit = 1;

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 glideInit(x, new_caption_id) {
	glideX = x;
	glideNew_caption_id = new_caption_id;
	if(isEnlarged) {
		reduce();
		glideTimer = setInterval("glideTo()", 50);
	}else{
		glideTo();
	}
}

function glideTo() {
	if(isEnlarged) {
		return;	
	}else{
		if(glideTimer) {
			clearInterval(glideTimer);
			glideTimer = false;
		}
	}
	
	/* Animate gliding to new x position */
	target = glideX;
	mem_target = glideX;
	if (timer == 0)
	{
		window.setTimeout(step, 50);
		timer = 1;
	}
	
	/* Display new caption */
	caption_id = glideNew_caption_id;
	caption = img_div.childNodes.item(array_images[caption_id]).getAttribute('alt');
	if (caption == '') caption = '&nbsp;';
	
	Element.update(caption_div, caption);
	
	/* Set scrollbar slider to new position */
	if (dragging == false)
	{
		new_slider_pos = (scrollbar_width * (-(glideX*100/((max_images-1)*xstep))) / 100) - new_posx;
		slider_div.style.marginLeft = (new_slider_pos - conf_slider_width) + 'px';
	}
}

function moveTo(x)
{
	current = x;
	var zIndex = max_images;

	/* Main loop */
	for (var index = 0; index < max_images; index++)
	{
		var image = img_div.childNodes.item(array_images[index]);
		var current_image = index * -xstep;
//Element.update($('debug'), size);
		/* 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;
//alert(image.h + "--" + image.w);
			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 = (Math.floor(images_width * 0.22) - new_img_h) + images_top + ((new_img_h / (conf_reflection_p + 1)) * conf_reflection_p);

			/* Set new image properties */
			image.style.left = Math.floor(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() { glideInit(this.x_pos, this.i); }
					break;

				default:
					zIndex = zIndex + 1;
					image.onclick = function() { enlargeInit(this); }
					break;
			}
			image.style.zIndex = zIndex;
		}
		x += xstep;
	}
}

function enlargeInit(image) {
	enlargeImage = image;
	enlargeTimer = setInterval("enlarge()", 50);
}

function enlarge() {
	if(timer) {
		return;	
	}else{
		clearInterval(enlargeTimer);
		enlargeTimer = false;
	}
	isEnlarged = true;
	var image = enlargeImage;
	var arrayPageSize = getPageSize();
	$('overlay').style.height = arrayPageSize[1] + 'px';
	$('overlay').style.width = arrayPageSize[0] + 'px';

	
	new Effect.Appear('overlay', { duration: overlayDuration, from: 0.0, to: overlayOpacity });
	
	enlargedImage = image;
	enlargedArray = new Array(image.style.height, image.style.width, image.style.top, image.style.left, image.style.zIndex);
	
	imageID = image.id;
	
	image.style.zIndex = 91;
	
	//Figure out top positioning and possible restriction of image height
	newTop = '';
	newHeight = '';
	if(image.h > arrayPageSize[3]) {
		newTop = 0;
		
		heightRatio = arrayPageSize[3]/image.h;
		newHeight = arrayPageSize[3];
		newWidth = Math.floor(image.w * heightRatio);
	}else{
		newHeight = image.h;
		newWidth = image.w;
		newTop = (arrayPageSize[3] - image.h) / 2;
	}
	
	
	new Effect.Morph(imageID, {
	  style: {
		height: newHeight + 'px',
		width: newWidth + 'px',
		top: newTop + 'px',
		left: (image.offsetLeft - ((newWidth - image.offsetWidth)/2)) + 'px'
		}, // CSS Properties
	  duration: 0.8 // Core Effect properties
	});
	
	image.onclick = function() { reduce(); }
}

function reduce() {
	new Effect.Fade('overlay', { duration: overlayDuration});
	imageID = enlargedImage.id;
	new Effect.Morph(imageID, {
	  style: {
		height: enlargedArray[0],
		width: enlargedArray[1],
		top: enlargedArray[2],
		left: enlargedArray[3]
	}, // CSS Properties
	  duration: 0.8, // Core Effect properties
	  afterFinish: function() {
		  isEnlarged = false;
	  }
	});
	enlargedImage.style.zIndex = enlargedArray[4];
	enlargedImage.onclick = function() { enlarge(enlargedImage); }
}

/* Main function */
function refresh(onload)
{
	/* 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 = Math.floor(images_width * 0.5);
	scrollbar_width = Math.floor(images_width * 0.6);
	conf_slider_width = Math.floor(conf_slider_width * 0.5);

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

	/* Change captions div properties */
	caption_div.style.width = images_width + 'px';
	caption_div.style.marginTop = Math.floor(images_width * -0.044) + 'px';

	/* Change scrollbar div properties */
	var arrayPageSize = getPageSize();
	pageWidth = arrayPageSize[0];
	scrollbar_div.style.marginTop = Math.floor(pageWidth * 0.022) + 'px';
	scrollbar_div.style.marginLeft = Math.floor(pageWidth * 0.2) + 'px';
	scrollbar_div.style.width = scrollbar_width + 'px';
	
	max_height = Math.floor(images_width * 0.30);

	/* Change imageflow div properties */
	imageflow_div.style.height = max_height + 'px';
	
	/* Set slider attributes */
	slider_div.onmousedown = function () { dragstart(this); };
	slider_div.style.cursor = conf_slider_cursor;
	
	array_images = new Array();
	
	//***************************************

	/* Cache EVERYTHING! */
	max_images = img_div.childNodes.length;
	var i = 0;
	for (var index = 0; index < max_images; index++)
	{ 
		var image = img_div.childNodes.item(index);
		if (image.nodeType == 1)
		{
			array_images[i] = index;
			
			/* Set image onclick by adding i and x_pos as attributes! */
			image.onclick = function() { glideInit(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 = 50;
					break;
			}

			/* Set ondblclick event */
			//image.url = image.getAttribute('longdesc');
			//image.ondblclick = function() { document.location = this.url; }

			/* Set image cursor type */
			image.style.cursor = conf_images_cursor;

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

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

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

/* Hide loading bar, show content and initialize mouse event listening after loading */
window.onload = function()
{
	if(document.getElementById(conf_imageflow))
	{
		var objBody = document.getElementsByTagName("body").item(0);
	
		var objOverlay = document.createElement("div");
		objOverlay.setAttribute('id','overlay');
		objOverlay.style.display = 'none';
		objOverlay.onclick = function() { reduce(); }
		objBody.appendChild(objOverlay);

		
		/* Cache document objects in global variables */
		imageflow_div = document.getElementById(conf_imageflow);
		img_div = document.getElementById(conf_images);
		scrollbar_div = document.getElementById(conf_scrollbar);
		slider_div = document.getElementById(conf_slider);
		caption_div = document.getElementById(conf_captions);
		
		Event.observe($('closeBox'),'click',function(){
			self.close();
		});
		
		images_width = img_div.offsetWidth;

		max_height = Math.floor(images_width * 0.35);
		
		$(conf_loading).style.height = Math.floor(max_height * 0.338) + 'px';
		
		/* Change imageflow div properties */
		imageflow_div.style.height = max_height + 'px';
		
		/* Change images div properties */
		img_div.style.height = Math.floor(images_width * 0.338) + 'px';
		
		/*var zoom_slider = $('zoom_slider');

		new Control.Slider(zoom_slider.down('.handle'), zoom_slider, {
		  range: $R(40, 160),
		  sliderValue: 50,
		  onSlide: function(value) {
				Element.update($('debug'), value);
			},
		  	onChange: function(value) { 
				Element.update($('debug'), value);
			}
		});*/

		//ADDED: create and display categories
		setupCategories();
		positionCategories();
		//************************************
		loadDelay();
	}
}

/* Refresh ImageFlow on window resize */

/*window.onresize = function()
{
	if(document.getElementById(conf_imageflow)) refresh();
}*/

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

/* 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_images-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) {
		glideInit(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_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_images-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';
		glideInit(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 setupImages() {
	var imageList = '';
	
	for(y=0;y<categoryArray[currentCategory][1].length;y++) {
		imageList += '<img id="image'+y+'" src="' + categoryArray[currentCategory][1][y] + '" rel="lightbox" alt="' + categoryArray[currentCategory][2][y] + '" />';
	}
	Element.update($('images'), imageList);
}

function setupCategories() {
	var categoryText = '';
	for(x=0;x<categoryArray.length;x++) {
		if(x != 0) {
			categoryText += ' | ';
		}
		categoryText += '<span class="category" id="category'+x+'" onClick="changeCategory('+x+');" onmouseover="categoryHighlight(true, '+x+');" onmouseout="categoryHighlight(false, '+x+');">' + categoryArray[x][0] + '</span>';
	}
	
	Element.update($('categoryList'), categoryText);
	categoryDiv = $('category0');
	categoryDiv.style.color = "red";
}

function positionCategories() {
	categoryWidth = $('categoryList').offsetWidth;
	$('categoryList').style.top = (Math.floor(images_width * 0.31894) + 135) + 'px';
	$('categoryList').style.left = (Math.floor((images_width/2) - (categoryWidth/2))) + "px";
}

function changeCategory(newCategory) {
	categoryDiv = $('category'+currentCategory);
	categoryDiv.style.color = "#3388cc";
	currentCategory = newCategory;
	categoryDiv = $('category'+newCategory);
	categoryDiv.style.color = "red";
	current = 0;
	caption_id = 0;
	mem_target = 0;
	loadDelay();
}

function categoryHighlight(mouseover, index) {
	categoryDiv = $('category'+index);
	if(currentCategory != index) {
		if(mouseover) {
			categoryDiv.style.color = "red";
		}else{
			categoryDiv.style.color = "#3388cc";
		}
	}
}

function loadDelay() {
	//ADDED: dynamically create image tags to be placed within the image div
	images_width = img_div.offsetWidth;
	
	$('loadingWedding').style.top = Math.floor(images_width * 0.30) + 'px';
	$('loadingWedding').style.left = (Math.floor(images_width/2) - 104) + "px";
	
	show(conf_loading);
	hide(conf_images);
	hide(conf_scrollbar);
	hide("captions");

	preloadImageIndex = 0;
	
	if(!preloadAnimTimer) {
		preloadActive = false;
		preloadAnimTimer = setInterval("loadDelayWorker()", 25);
	}
}

function imageLoaded() {
	Element.update($('counter'), preloadImageIndex+1 + " of " + max_images);
	preloadActive = false;
	preloadImageIndex++;
}

function loadDelayWorker() {
	//Revalidate total number ofimages
	max_images = categoryArray[currentCategory][1].length;
	
	if(preloadImageIndex < max_images) {

		if(!preloadActive) {
			imgPreload = new Image();
			preloadActive = true;	
			imgPreload.src = categoryArray[currentCategory][1][preloadImageIndex];
		}else{
			if(imgPreload.width) {
				imageLoaded();
			}
		}
	}else{
		clearInterval(preloadAnimTimer);
		preloadAnimTimer = false;	
		setupImages();
		hide(conf_loading);
		show(conf_images);
		show(conf_scrollbar);
		show("captions");
		if(!initialized) {
			initMouseWheel();
			initMouseDrag();
			initialized = true;
			show("categoryList");
		}
		refresh(true);
	}
}

// -----------------------------------------------------------------------------------

//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.com
//
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;
}

// -----------------------------------------------------------------------------------

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.com
// Edit for Firefox by pHaez
//
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;
	
//	console.log(self.innerWidth);
//	console.log(document.documentElement.clientWidth);

	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;
	}

//	console.log("xScroll " + xScroll)
//	console.log("windowWidth " + windowWidth)

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = xScroll;		
	} else {
		pageWidth = windowWidth;
	}
//	console.log("pageWidth " + pageWidth)

	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}

// -----------------------------------------------------------------------------------