/*
Created By: Chris Campbell
Website: http://particletree.com
Date: 2/1/2006

Inspired by the lightpage implementation found at http://www.huddletogether.com/projects/lightpage/
*/

/*-------------------------------GLOBAL VARIABLES------------------------------------*/
var valid;
var overlay_id = 'overlay2';
var lightpage_id = 'lightpage';
var content_id = 'lbContent'
/*-----------------------------------------------------------------------------------------------*/

var lightpage = Class.create();

lightpage.prototype = {

	yPos : 0,
	xPos : 0,

	initialize: function(ctrl) {
		this.content = ctrl.href;
		Event.observe(ctrl, 'click', this.activate.bindAsEventListener(this), false);
		ctrl.onclick = function(){return false;};
	},

	// Turn everything on - mainly the IE fixes
	activate: function(){
		if(Prototype.Browser.IE) {
			this.getScroll();
			this.prepareIE('100%', 'hidden');
			this.setScroll(0,0);
			this.hideSelects('hidden');
		}

		/* lightpage position start */
		var arrayPageSize = this.getPageSize();

		$(overlay_id).setStyle({ width: arrayPageSize[0] + 'px' });
		$(overlay_id).setStyle({ height: arrayPageSize[1] + 'px' });

		var arrayPageScroll = document.viewport.getScrollOffsets();
		var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight()/10) + 200;
		var lightboxLeft = (arrayPageSize[0] > 600) ? (arrayPageSize[0] - 600) / 2 + 250 : 260;

		$(lightpage_id).setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' }).show();
		/* lightpage position end */

		this.displayLightbox("block");
		$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });
	},

	getPageSize: function() {
		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;
		
		if (self.innerHeight) {	// all except Explorer
			windowWidth = (document.documentElement.clientWidth) ? document.documentElement.clientWidth : 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
		var pageHeight = (yScroll < windowHeight) ? windowHeight : yScroll;
		// for small pages with total width less then width of the viewport
		var pageWidth = (xScroll < windowWidth) ? xScroll : windowWidth;

		return [pageWidth,pageHeight];
	},

	// Ie requires height to 100% and overflow hidden or else you can scroll down past the lightpage
	prepareIE: function(height, overflow){
		var bod = $$('body')[0];
		bod.style.height = height;

		var htm = $$('html')[0];
		htm.style.height = height;
	},

	// In IE, select elements hover on top of the lightpage
	hideSelects: function(visibility){
		var selects = $$('select');
		for(var i = 0; i < selects.length; i++) {
			selects[i].style.visibility = visibility;
		}
	},

	// Taken from lightpage implementation found at http://www.huddletogether.com/projects/lightpage/
	getScroll: function(){
		if (self.pageYOffset) {
			this.yPos = self.pageYOffset;

		} else if (document.documentElement && document.documentElement.scrollTop){
			this.yPos = document.documentElement.scrollTop; 

		} else if (document.body) {
			this.yPos = document.body.scrollTop;
		}
	},

	setScroll: function(x, y){
		window.scrollTo(x, y); 
	},

	displayLightbox: function(display){
		$(overlay_id).style.display = display;
		$(lightpage_id).style.display = display;
		if(display != 'none') this.loadInfo();
	},

	// Begin Ajax request based off of the href of the clicked linked
	loadInfo: function() {
		var myAjax = new Ajax.Request(
			this.content,
			{method: 'post', parameters: "", onComplete: this.processInfo.bindAsEventListener(this)}
		);
	},

	// Display Ajax response
	processInfo: function(response){
		var me = this;

		$(content_id).innerHTML = response.responseText;
		$(content_id).style.display='';
		$(lightpage_id).className = "done";	

		me.actions();
		if(me.callfunction != undefined) me.callfunction();
	},

	// Search through new links within the lightpage, and attach click event
	actions: function(){
		var lbActions = $$('[class="lbAction"]'); 
		for(var i = 0; i < lbActions.length; i++) {
			Event.observe(lbActions[i], 'click', this[lbActions[i].rel].bindAsEventListener(this), false);
			lbActions[i].onclick = function(){return false;};
		}
	},

	// Example of creating your own functionality once lightpage is initiated
	insert: function(e){
		var link = Event.element(e).parentNode;
		$(content_id).style.display='none';

		var myAjax = new Ajax.Request(
			link.href,
			{method: 'post', parameters: "", onComplete: this.processInfo.bindAsEventListener(this)}
		);
	},

	// Example of creating your own functionality once lightpage is initiated
	deactivate: function(){
		$(content_id).style.display='none';

		if(Prototype.Browser.IE) {
			this.setScroll(0,this.yPos);
			this.prepareIE("auto", "auto");
			this.hideSelects("visible");
		}

		this.displayLightbox("none");
		$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'visible' });
	}
}

/*-----------------------------------------------------------------------------------------------*/

document.observe('dom:loaded', function () {
	addLightboxMarkup();

	var lbox = $$('[class="lbOn"]'); 
	for(var i=0; i<lbox.length; i++) {
		valid = new lightpage(lbox[i]);
		lbox[i].style.display='';
	}

	var lpage = $$('a[rel="'+lightpage_id+'"]'); 
	for(var i=0; i<lpage.length; i++) {
		lpage[i].style.display='';
	}

	if(typeof onLoadLightPage == 'function') { onLoadLightPage(); }
});


// Add in markup necessary to make this work. Basically two divs:
// Overlay holds the shadow
// Lightbox is the centered square that the content is put into.
function addLightboxMarkup() {
	var bod = $$('body')[0];
	var overlay = document.createElement('div');
	overlay.id = overlay_id;
	overlay.style.display = 'none';

	var lb = document.createElement('div');
	lb.id = lightpage_id;
	lb.className = 'loading';
	lb.innerHTML = '<div id="'+content_id+'" style="display:none;"></div>';
	lb.innerHTML += '<div id="lbLoadMessage"><p>Loading</p></div>';

	bod.appendChild(overlay);
	bod.appendChild(lb);
}


function LightPageSize(w, h){
	if(w > 0) $(lightpage_id).style.width = w+'px';
	if(h > 0) $(lightpage_id).style.height = h+'px';
}