/**
 *  SlideShowFlow 0.1
 *  This Code ist based on ImageFlow 0.8 (see below) by Finn Rudolph
 *  http://imageflow.finnrudolph.de
 *  Many parts of the code are adapted and added to fit in schuelper.com homepage.
 *
 *	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 = 6;                  // Sets the numbers of images on each side of the focussed one
var conf_slider_width = 16;          // 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 = 'pointer';  // 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 = 'loadingFlow';        // 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 array_imgSrc = 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 = 90; //Abstand zum Mittelbild der Thumbs
//Eigene Vars
var max = 0;
var an=false;
var refx = 0;
var ladeBild = 0;
var BildCache = 0;
var BildCacheVor = 0;
var BildCacheZur = 0;
var BildCacheG = 0;
var ueberblende = 0;
var scrolle = 0;
var posIF = 0;
var geblendet = true;
var aktiv =0 ;
var diaGeschw = 5000;
var cntdwn = 0;
var fotoPfNorm = fotoPfad + "normal/";
var fotoPfGr = fotoPfad + "voll/";

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 = galTitel + " - Foto " + parseInt(caption_id+1) + " von " + max;
	document.title = winTitle + galTitel + " - Foto " + parseInt(caption_id+1) + " von " + max;
	
	// Bilder laden und ggf. alten Ladevorgang abbrechen
	bildCache = new Image();
	bildCache.src = fotoPfNorm + array_imgSrc[caption_id];	
	bildCacheG = fotoPfGr + array_imgSrc[caption_id];
	clearInterval(ladeBild);
	
	// Ladeanzeige einblenden und neues Bild setzen
	show(conf_loading);
	document.getElementById(conf_loading).style.display = "inline";		
	ladeBild = setInterval("setzeBild()", 200);
	
	/* 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 * 1.6 * 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() { geheZu(this.url); }
					break;
			}
			image.style.zIndex = zIndex;
			
		}
		x += xstep;
	}
}

function getPosition(element)
{
  var elem=element,tagname="",x=0,y=0;
  while ((typeof(elem)=="object")&&(typeof(elem.tagName)!="undefined"))
  {
    y+=elem.offsetTop;     /* Offset des jeweiligen Elements addieren */
    x+=elem.offsetLeft;    /* Offset des jeweiligen Elements addieren */
    tagname=elem.tagName.toUpperCase(); /* tag-Name ermitteln, Grossbuchstaben */

    if (tagname=="BODY")
      elem=0;
    if (typeof(elem)=="object")
      if (typeof(elem.offsetParent)=="object")
        elem=elem.offsetParent;
  }

  position=new Object();
  position.x=x;
  position.y=y;
  return position;
}
/* Main function */
function refresh(onload)
{
	/* 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);

	/* Cache global variables, that only change on refresh */
	images_width = img_div.offsetWidth;
	posIF = getPosition(document.getElementById("galerie"));
	images_top = posIF.y + 400;//imageflow_div.offsetTop;
	images_left = posIF.x + 120;
	max_conf_focus = conf_focus * xstep;
	size = images_width * 0.318;
	scrollbar_width = images_width * 0.8;
	conf_slider_width = conf_slider_width * 0.5;
	max_height = 140;//images_width * 0.5;

	/* Change imageflow div properties */
	imageflow_div.style.height = max_height - 80 + 'px';

	/* Change images div properties */
	img_div.style.height = 0 + "px"; // images_width * 0.02 + '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 * 0.1 + 'px';
	//scrollbar_div.style.width = scrollbar_width + 'px';
	//scrollbar_div.onmousedown = function () { dragstart(slider_div); };
	
	/* Set slider attributes */
	slider_div.onmousedown = function () { dragstart(this); };
	slider_div.style.cursor = conf_slider_cursor;
	
	/*Ladebalken ins Bildrücken*/
	var ladeBalken = document.getElementById(conf_loading);
	ladeBalken.style.width = "250px";
	ladeBalken.style.height = "80px";
	ladeBalken.style.border = "1px solid #666666";
	ladeBalken.style.position = "absolute";
	ladeBalken.style.top = posIF.y + 190 + "px";
	ladeBalken.style.left = images_left + 75 + "px";
	ladeBalken.style.zIndex = 10003;
	setzeDichte("loadingFlow",70);

	/* 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');
			array_imgSrc[i] = image.url;
			//image.ondblclick = function() { geheZu(image.url); }

			/* 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);
}

/* 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);
		var image = img_div.childNodes.item(array_images[new_caption_id]);
		//geheZu(image.url);
	}
}

/* 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) document.getElementById("galerie").addEventListener('DOMMouseScroll', wheel, false);
	document.getElementById("galerie").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:
			weiter(-1);
			break;
		
		/* Left arrow key */
		case 37:
			weiter(1);
			break;
		// + Tasten
		case 107:
			diaSpeed(-1);
			break;
		case 61:
			diaSpeed(-1);
			break;
		// - Taste
		case 109:
			diaSpeed(1);
			break;
		// d Taste
		case 68:
			dia();
			break;
	}
}

function setzeBild()
{
	if(bildCache.complete == true)
	{	
		var bildAnsprechen = document.getElementById("bildGross");
  	    bildAnsprechen.src = bildCache.src;
		Reflection.add(bildAnsprechen, { height: 0.2, opacity: 0.5 });
		document.getElementById("bildGrossLink").href = bildCacheG;
		hide(conf_loading);
		BildCacheVor = new Image();
		BildCacheZur = new Image();
		BildCacheVor.src = fotoPfNorm + array_imgSrc[caption_id+1];	
		BildCacheZur.src = fotoPfNorm + array_imgSrc[caption_id-1];
		//blenden("bildGross",0,4,1);
		clearInterval(ladeBild);
	}
}
/*function blenden(welches, frame, anzahl, aufab)
{
	geblendet = true;
	frame = frame + aufab;
	if(aufab < 0 && frame >= 0 || aufab > 0 && frame <= anzahl)
	{		
		setzeDichte(welches+"Div", frame/anzahl*100);	
		gebledet = false;
		ueberblende = setTimeout("blenden('"+welches+"',"+frame+","+anzahl+","+aufab+")", 75);
	}
	else
		if(aufab<0)
			show(conf_loading);
}*/
function dia()
{
	clearTimeout(cntdwn);
	if(an == true)
	{
		clearInterval(aktiv);
		an = false;
		document.getElementById("diaDiv").src = icoPfad + "diaAn.gif";
		document.getElementById("diaSek").innerHTML = " ";
	}
	else
	{
		an = true;
		document.getElementById("diaDiv").src = icoPfad + "diaAus.gif";
		countdown(diaGeschw);
		aktiv = setInterval("weiter("+-1+")", diaGeschw);
	}
}
function diaSpeed(wert)
{
	if(an == true)
	{
		clearInterval(aktiv);
		diaGeschw += (wert*1000);
		if(diaGeschw < 1000)
		{
			diaGeschw = 1000;
			alert("Maximale Diashowgeschwindigkeit erreicht!");
		}
		if(diaGeschw > 20000)
		{
			diaGeschw = 20000;
			alert("Minimale Diashowgeschwindigkeit erreicht!");
		}
		document.getElementById("diaSek").innerHTML = "Bildwechsel in " + diaGeschw / 1000 + " Sekunden.";
		clearTimeout(cntdwn);
		countdown(diaGeschw);
		aktiv = setInterval("weiter("+-1+")", diaGeschw);
	}
}
function countdown(zeit)
{
	document.getElementById("diaSek").innerHTML = "Bildwechsel in " + zeit / 1000 + " Sekunden.";	
	if(zeit>1000)	cntdwn = setTimeout("countdown("+parseInt(zeit-1000)+")", 1000);
}
function weiter(vorZu)
{
		if(caption_id+2>max && vorZu < 0)
			glideTo(0, 0);
		else if(caption_id-1<0 && vorZu > 0) 
			glideTo(-(max-1)*xstep, max-1);
		else 
			handle(vorZu);
		if(an == true)
			countdown(diaGeschw);
		
}
function setzeDichte(welches, opacity) 
{  
  welches = document.getElementById(welches); 
  opacity = (opacity == 100)?99.999:opacity; 
  // IE/Win
  welches.style.filter = "alpha(opacity:"+opacity+")"; 
  // Safari<1.2, Konqueror
  welches.style.KHTMLOpacity = opacity/100;
  // Older Mozilla and Firefox
  welches.style.MozOpacity = opacity/100;
  // Safari 1.2, newer Firefox and Mozilla, CSS3
  welches.style.opacity = opacity/100;
}
function scrolleUm(anz)
{
	weiter(anz);
	scrolle = setTimeout("scrolleUm("+anz+")", 300);
}
function scrollstop()
{
	clearTimeout(scrolle);	
}