/**
 *	ImageFlow 0.8
 *
 *	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 = 11;          // 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 = 'loading';        // 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;

/*from andi new vars needed*/
var containerDiv = imgDiv = textDiv = imageLoader = imageLoaderInt = null;


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_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';
			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;
//					image.onclick = function() { document.location = this.url; }
					image.onclick = function() { showMedia(this); }
					break;
			}
			image.style.zIndex = zIndex;
		}
		x += xstep;
	}
}

/* Main function */
function refresh(onload)
{
	/* Cache document objects in global variables */
	imageflow_div = $(conf_imageflow);
	img_div = $(conf_images);
	scrollbar_div = $(conf_scrollbar);
	slider_div = $(conf_slider);
	caption_div = $(conf_captions);

	/* Cache global variables, that only change on refresh */
	images_width = img_div.offsetWidth;
	imagesOffsets = imageflow_div.cumulativeOffset();
	images_top = imagesOffsets.top;
	images_left = imagesOffsets.left;
	max_conf_focus = conf_focus * xstep;
	size = images_width * 0.5;
	scrollbar_width = images_width * 0.6;
	conf_slider_width = conf_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_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)
		{
			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');
//			image.ondblclick = function() { document.location = this.url; }
			image.ondblclick = function() { showMedia(this); }

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

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

	/* Display images in current order */
	moveTo(current);
	glideTo(current, caption_id);
	
	/*mod from andi: build the divs for the fancy zooming*/
	body = document.getElementsByTagName('body')[0];
	containerDiv = new Element('div', {'id': 'twmdf-zoom-container', 'style': 'display:none;'});	
	body.appendChild(containerDiv);
	$('toggle').setStyle({'visibility' : 'visible'});
	
}

/* 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';
}

/* Hide loading bar, show content and initialize mouse event listening after loading */
window.onload = function()
{
	if(document.getElementById(conf_imageflow))
	{
		hide(conf_loading);
		refresh(true);
		show(conf_images);
		show(conf_scrollbar);
		initMouseWheel();
		initMouseDrag();
	}
}

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

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;
	}
}


/*mod from andi starts here*/
function showMedia(el){
	imageLoader = new Image();
	imageLoader._width = el.getWidth();
	imageLoader._height = (el.getHeight() * 2 / 3);
	imageLoader.alt = el.alt;
	imageLoader.title = el.title;
	imageLoader.src = el.url;
	//alert(imageLoader._width);
	var pos = el.cumulativeOffset();
	containerDiv.update();
	containerDiv.setStyle({
		'backgroundColor': 'transparent',
		'top': (pos.top - 10) + 'px',
		'left': (pos.left - 10) + 'px',
		'width': (imageLoader._width + 20) + 'px',
		'height': (imageLoader._height + 20) + 'px'
	});
	containerDiv.show();
	imageLoaderInt = window.setInterval(zoomMedia, 50);
}

//with(){addParam('wmode','transparent');addParam('allowScriptAccess','sameDomain');addVariable('halt','0');addVariable('flv', '118');;write('flv403d58');}

function zoomMedia() {
	if (imageLoader.complete) {
		
		// Löschen des Intervalls
		window.clearInterval(imageLoaderInt);
		imageLoaderInt = null;

		var img = new Element('img', {'src': imageLoader.src});
		var imgDiv = new Element('div', {'id': 'twmdf-zoom-image'});
		imgDiv.appendChild(img);
		containerDiv.appendChild(imgDiv);
		var text = false, textDiv = new Element('div', {'id': 'twmdf-zoom-text', 'style': 'display:none;'});
		if(imageLoader.alt != ''){
			text = true;
			textDiv.appendChild((new Element('h3')).update(imageLoader.alt));
		}
		if((imageLoader.title != '') && (imageLoader.title != imageLoader.alt)) {
			text = true;
			textDiv.appendChild((new Element('p')).update(imageLoader.title));
		}
		var pos = containerDiv.cumulativeOffset();
		if (text) {
			containerDiv._text = textDiv;
			containerDiv.appendChild(textDiv);
		} else {
			containerDiv._text = false;
		}
		containerDiv._image = imgDiv;
		containerDiv.setStyle({
			'backgroundColor': '#ffffff',
			'height': 'auto'
		});
		
		if (mediaMode == 2) {
			imageLoader.width = 470;
			imageLoader.height = 390;
		}
		new Effect.Scale(containerDiv, ((imageLoader.width + 20) / (imageLoader._width + 20)) * 100, {
			duration: 0.4,
			scaleFromCenter: true,
			afterFinish:function(effect){
				switch(mediaMode) {
					// Bilder
					case 1:
						effect.element._image.down('img').onclick = closeMedia;
						cl = new Element('div', {'id':'close-media'}).update('close');
						cl.onclick = closeMedia
						containerDiv.appendChild(cl);
						break;
						
					// Videos
					case 2:
						var flv = parseInt(imageLoader.src.split('/').pop()), movie = 'http://meinlguitarfestival.com/typo3conf/ext/tw_mgf/res/tw_player_gf.swf?init=0&flv=' + flv;
						with (new SWFObject(movie, 'twmdf-zoom-image', 470, 390, '8', '#ffffff')) {
							addParam('wmode', 'transparent');
							addParam('allowScriptAccess', 'sameDomain');
							addVariable('init', '0');
							addVariable('flv', flv);
							write('twmdf-zoom-image')
						}
						cl = new Element('div', {'id':'close-media'}).update('close');
						cl.onclick = closeMedia
						containerDiv.appendChild(cl);
						break;
				}
				
				
				effect.element.setStyle({'height': 'auto'}); 
				if (effect.element._text) {
					Effect.BlindDown(effect.element._text, {duration: 0.4});
				}
			}, afterUpdate: function(effect) { effect.element.setStyle({'height': 'auto'})}
		});
	}
}

function closeMedia(){
	containerDiv.update();
	containerDiv.hide();
}