/* Configuration variables */
var conf_reflection_p = 1.5;         // Sets the height of the reflection in % of the source image 
var conf_focus = 2;                  // Sets the numbers of images on each side of the focussed one
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'
/* 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 posx = 0;
var new_posx = 0;
var angle_bas 			= 0.6; /* coef gérant l'angle du bas que décrivent les images */
var image_y_delta		= -75 ; /* décalage Y des images */
var image_depart_num	= 1;
/* influe sur la taille des images */
var xstep 				= 100;
var landscape_format	= 132;
var imgHeightOrigine	= 220;
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;
	try{
		caption = img_div.childNodes.item(array_images[caption_id]).getAttribute('alt');
	}catch(e){
		caption = '';
	}
	if (caption == '') caption = '&nbsp;';
	caption_div.innerHTML = '<span>'+caption+'</span>';
	
	try{
	if($('p'+img_div.childNodes.item(array_images[caption_id]).getAttribute('id')) != null) {
		caption_div.onclick = function(){scroller.toElement('p'+img_div.childNodes.item(array_images[caption_id]).getAttribute('id'));}
		caption_div.onmouseover = function(){caption_div.className='captionOver';};
		caption_div.onmouseout = function(){caption_div.className='captionOut';};
		caption_div.className='captionOut';
	} else {
		caption_div.onclick = '';
		caption_div.onmouseover = '';
		caption_div.onmouseout = '';
		caption_div.className = '';
	}
	}catch(e){}
	
}
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.height / image.width * 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.width * new_img_h / image.height;
					break;
			}
			
			var new_img_top = (images_width * 0.34 - new_img_h) + ((new_img_h / (conf_reflection_p + angle_bas)) * conf_reflection_p) + images_top + image_y_delta;
			/* 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:
					try{
					if(typeof(image.onclick) != 'object'){image.removeEvents("click");}
					}catch(e){}
					image.onclick = function() { glideTo(this.x_pos, this.i); }
					break;
					
				default:
					zIndex = zIndex + 1;
					var source = new String(image.src);
					var reg	= new RegExp("(galerie.png)", "g");
					var imageURL = source.replace(reg,"produit.jpg")
					
					image.onclick = function(){
						showLightbox(imageURL, img_div.childNodes.item(array_images[caption_id]).getAttribute('alt'));
					}
					break;
			}
			image.style.zIndex = zIndex;
			
		}
		x += xstep;
	}
	
}
/* Main function */
function refresh(onload)
{
	/* Cache document objects in global variables */
	imageflow_div = document.getElementById(conf_imageflow);
	img_div = document.getElementById(conf_images);
	caption_div = document.getElementById(conf_captions);
	/* Cache global variables, that only change on refresh */
	images_width = img_div.offsetWidth;
	images_top = imageflow_div.offsetTop;
	images_left = 0;
	max_conf_focus = conf_focus * xstep;
	size = images_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';
	
	/* 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.height = imgHeightOrigine;
				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 = landscape_format; /* % de zoom */
					break;
				/* Portrait and square format */
				default:
					image.pc = 100; /* % de zoom */
					break;
			}
			
			/* Set image cursor type */
			image.style.cursor = conf_images_cursor;
			i++;
		}
	}
	max = array_images.length;
	
	if(onload == true) {
		image_depart_num = array_images.length; // Math.round(array_images.length/2);
		target = -(image_depart_num-1)*xstep;
		caption_id	= image_depart_num-1;
	}
	/* Display images in current order */
	moveTo(target);
	glideTo(target, 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.addEvent('domready',function(){
	if(document.getElementById(conf_imageflow))
	{
		hide(conf_loading);
		refresh(true);
		initMouseWheel();
		show(conf_images);
		newNum	= Math.round(array_images.length/2);
		glideTo(-(newNum-1)*xstep, newNum-1);
	}
});
/* 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-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;
}
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;
	}
}