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

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

Modified by Mathematics http://xy-1.com .. thanks for the ground work Chris and Lokesh
*/


/*-------------------------------GLOBAL VARIABLES------------------------------------*/

var detect = navigator.userAgent.toLowerCase();
var OS,browser,version,total,thestring;

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


//Browser detect script originally created by Peter Paul Koch at http://www.quirksmode.org/

function getBrowserInfo() {
	if (checkIt('konqueror')) {
		browser = "Konqueror";
		OS = "Linux";
	}
	else if (checkIt('safari')) browser 	= "Safari"
	else if (checkIt('omniweb')) browser 	= "OmniWeb"
	else if (checkIt('opera')) browser 		= "Opera"
	else if (checkIt('webtv')) browser 		= "WebTV";
	else if (checkIt('icab')) browser 		= "iCab"
	else if (checkIt('msie')) browser 		= "Internet Explorer"
	else if (!checkIt('compatible')) {
		browser = "Netscape Navigator"
		version = detect.charAt(8);
	}
	else browser = "An unknown browser";

	if (!version) version = detect.charAt(place + thestring.length);

	if (!OS) {
		if (checkIt('linux')) OS 		= "Linux";
		else if (checkIt('x11')) OS 	= "Unix";
		else if (checkIt('mac')) OS 	= "Mac"
		else if (checkIt('win')) OS 	= "Windows"
		else OS 						= "an unknown operating system";
	}
}

function checkIt(string) {
	place = detect.indexOf(string) + 1;
	thestring = string;
	return place;
}

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

var lightbox = Class.create();

lightbox.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 (browser == 'Internet Explorer') {
			this.getScroll();
			this.prepareIE('100%', 'hidden');
			this.setScroll(0,0);
			this.hideSelects('hidden');
		}
		this.hideFlash('hidden');
		this.displayLightbox("block");
	},
	
	// Ie requires height to 100% and overflow hidden or else you can scroll down past the lightbox
	prepareIE: function(height, overflow) {
		bod = document.getElementsByTagName('body')[0];
		bod.style.height = height;
		bod.style.overflow = overflow;
  
		htm = document.getElementsByTagName('html')[0];
		htm.style.height = height;
		htm.style.overflow = overflow; 
	},

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


	// In IE, select elements hover on top of the lightbox
	hideFlash: function(visibility){
		$('audio').style.visibility = visibility;
	},

	
	// Taken from lightbox implementation found at http://www.huddletogether.com/projects/lightbox/
	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) {
		if(display != 'none') {
  		$('lightbox').className = "loading";
  		$('lightbox').style.visibility = "hidden";
  		setTimeout(this.displayLoad.bindAsEventListener(this), 250);
		}

		$('overlay').style.display  = display;
		$('lightbox').style.display = display;
	},


  // Display the loading message
	displayLoad: function() {
    this.centerLb('lbLoadImage');
    setTimeout(this.loadInfo.bindAsEventListener(this),250);
  },


	// 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) {
  	$('lightbox').style.visibility = "hidden";
    $('lightbox').className = "done";
  	info = "<div id='lbContent'>" + response.responseText + "</div>";
		new Insertion.Before($('lbLoadMessage'), info);
		setTimeout(this.displayImage.bindAsEventListener(this), 250);  // pause it to display correctly, helps redraw
		this.actions();
	},


	// Display The Image 
	displayImage: function(response) {
		this.centerLb('lbImage');
		this.actions();
	},


	// Mod to center the lightbox based on the image dimensions
	centerLb: function(element) {
	  var width   = $(element).width;
	  var height  = $(element).height;
    $('lightbox').style.margin = "-" + height/2 + "px 0 0 -" + width/2 + "px";
    $('lightbox').style.visibility = "visible";
	},
		
		
	// Search through new links within the lightbox, and attach click event
	actions: function() {
		lbActions = document.getElementsByClassName('lbAction');
		for(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 lightbox is initiated
	insert: function(e) {
	  link = Event.element(e).parentNode;
	  Element.remove($('lbContent'));
	  var myAjax = new Ajax.Request(
		  link.href,
		  {method: 'post', parameters: "", onComplete: this.processInfo.bindAsEventListener(this)}
	  );
	},
	
	
	// Example of creating your own functionality once lightbox is initiated
	deactivate: function() {
		Element.remove('lbContent');
		if (browser == "Internet Explorer") {
			this.setScroll(0,this.yPos);
			this.prepareIE("auto", "auto");
			this.hideSelects("visible");
		}
		
		this.displayLightbox("none");
		this.hideFlash('visible');
	}
}

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

// Onload, make all links that need to trigger a lightbox active
function lb_initialize() {
	addLightboxMarkup();
	lbox = document.getElementsByClassName('lbOn');
	lbox.inspect();
	for(i = 0; i < lbox.length; i++) {
		valid = new lightbox(lbox[i]);
	}
}

// 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() {
	bod 		    = document.getElementsByTagName('body')[0];
	overlay 		= document.createElement('div');
	overlay.id	= 'overlay';
	lb			    = document.createElement('div');
	lb.id			  = 'lightbox';
	lb.className 	= 'loading';
	lb.innerHTML	= '<div id="lbLoadMessage">' +
					  '<img src="images/loading.gif" width="126" height="22" id="lbLoadImage">' +
					  '</div>';
	bod.appendChild(overlay);
	bod.appendChild(lb);
}