/* 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 = '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;

///////////////////////////////////////
// define el crecimiento de la imagen
var multi=1.4;//multiplicador de tamaño de la imagen de base
var corrector=-4;//corrector de altura
var xstep = 100*multi;//distancia entre imagenes

var multiplicador=1.6; //por cuanto se multiplicará el tamaño de la imagen al abrir
var ancho_contenedor=555; //tamaño del contenedor de imageflow
var modl=50; //modificador desde la izquierda
var modt=200;//modificador desde arriba

///////////////////////////////////////
    
function pep(imag,alto,ancho,ajuste_al,ajuste_an,z,b){
  $(imag).animate({ 
	width: alto+'px',
	height: ancho+'px',
	left: ajuste_an,
	top: ajuste_al,
	zindex: "'"+z+"'"

  }, 500 );
}



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)
{	
	target = x;
	mem_target = x;
	if (timer == 0)
	{
		window.setTimeout(step, 50);
		timer = 1;
	}
	
	caption_id = new_caption_id;
	caption = img_div.childNodes.item(array_images[caption_id]).getAttribute('alt');
	if (caption == '') caption = '&nbsp;';
	caption_div.innerHTML = caption;


	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;
	for (var index = 0; index < max; index++)
	{
		var image = img_div.childNodes.item(array_images[index]);
		var current_image = index * -xstep;

		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;

			image.style.display = 'block';
			image.pepe=0;
			image.style.border = 'none';

			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);

			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*multi + 'px'; 
				image.style.width = new_img_w*multi + 'px'; 
				image.style.top = new_img_top+corrector + 'px';
			}
			image.style.visibility = 'visible';

			switch ( x < 0 )
			{
				case true:
					zIndex++;
					break;

				default:
					zIndex = zIndex - 1;
					break;
			}
			var ultimo;
			switch ( image.i == caption_id )
			{
				case false:
					image.onclick = function() { 
						this.pepe=0;
						if(ultimo)
							ultimo.style.border='none';
			
						glideTo(this.x_pos, this.i); 
					}
					
					break;

				default:
					zIndex = zIndex + 1;
					this.pepe=0;
					
					image.onclick = function() { 
						ultimo=this;
						if(this.pepe!=1 && this.pepe==0 && timer==0 ){
							this.pepe=1;
							this.previoT=this.style.top;
							this.previoL=this.style.left;
							this.zprev=this.style.zIndex;
							 ajuste_en_alto=-((this.height*multiplicador)/(multiplicador*multiplicador))+modt+'px';
							  ajuste_en_ancho=(((ancho_contenedor-this.width)/multiplicador)/(multiplicador*multiplicador)+modl)+'px';
							pep(this,(this.width*multiplicador),(this.height*multiplicador), ajuste_en_alto, ajuste_en_ancho, '20000')
						}else if(this.pepe==1 && this.pepe!=0){
							this.pepe=0;
							this.style.border='none';
							pep(this,(this.width/multiplicador),(this.height/multiplicador),this.previoT,this.previoL,this.zprev)
						}
					 }
					break;
			}
			image.style.zIndex = zIndex;
		}
		x += xstep;
	}
}

/* Main function */
function refresh(onload)
{
	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);

	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_slider_width = conf_slider_width * 0.5;
	max_height = images_width * 0.51;

	imageflow_div.style.height = max_height + 'px';

	img_div.style.height = images_width * 0.338 + 'px';

	caption_div.style.width = images_width + 'px';
	caption_div.style.marginTop = images_width * 0.03 + 'px';

	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';
	
	slider_div.onmousedown = function () { dragstart(this); };
	slider_div.style.cursor = conf_slider_cursor;

	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;
			
			image.onclick = function() { 
				this.pepe=0;
				alert ("linea 269")
				glideTo(this.x_pos, this.i); }
			image.x_pos = (-i * xstep);
			image.i = i;
			
			
			if(onload == true)
			{
				image.w = image.width;
				image.h = image.height;
			}

			switch ((image.w + 1) > (image.h / (conf_reflection_p + 1))) 
			{
				case true:
					image.pc = 118;
					break;

				default:
					image.pc = 100;
					break;
			}

			image.url = image.getAttribute('longdesc');
	
			image.style.cursor = conf_images_cursor;

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

	moveTo(current);
	glideTo(current, caption_id);
}

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';
}

window.onload = function()
{
	if(document.getElementById(conf_imageflow))
	{
		hide(conf_loading);
		refresh(true);
		show(conf_images);
		show(conf_scrollbar);
		initMouseWheel();
		initMouseDrag();
	}
}

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

window.onunload = function()
{
	if(navigator.appName!='Microsoft Internet Explorer')
  		document = null;
}


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;
	}

	if (change == true)
	{
		glideTo(target, new_caption_id);
	}
}

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;
}

function initMouseWheel()
{
	if(window.addEventListener) imageflow_div.addEventListener('DOMMouseScroll', wheel, false);
	imageflow_div.onmousewheel = wheel;
}

function dragstart(element)
{
	dragobject = element;
	dragx = posx - dragobject.offsetLeft + new_slider_pos;
}

function dragstop()
{
	dragobject = null;
	dragging = false;
}

function drag(e)
{
	posx = document.all ? window.event.clientX : e.pageX;
	if(dragobject != null)
	{
		dragging = true;
		new_posx = (posx - dragx) + conf_slider_width;

		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);
	}
}

function initMouseDrag()
{
	document.onmousemove = drag;
	document.onmouseup = dragstop;
	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)
	{
		case 39:
			handle(-1);
			break;
		
		case 37:
			handle(1);
			break;
	}