/*
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/
*/

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

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

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

//Browser detect script origionally 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;
}

function endsWith(string, pattern) {
	var d = string.length - pattern.length;
	return d >= 0 && string.lastIndexOf(pattern) === d;
}

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

Event.observe(window, 'load', initialize, false);
Event.observe(window, 'load', getBrowserInfo, false);
Event.observe(window, 'unload', Event.unloadCache, false);

var lightbox = Class.create();

lightbox.prototype = {

	yPos : 0,
	xPos : 0,

	initialize: function(ctrl) {
		this.content = endsWith(ctrl.href, '#') ? ctrl.name : 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.displayLightbox("block");
		this.enableKeyboardNav();
	},
	
	// 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;
		}
	},
	
	// 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){
		$('overlay').style.display = display;
		$('lightbox').style.display = display;
		if(display != 'none') this.loadInfo();
	},
	
	// Begin Ajax request based off of the href of the clicked linked
	loadInfo: function() {
		$('lightbox').removeClassName("done");
		$('lightbox').addClassName("loading");
		var myAjax = new Ajax.Request(
       this.content,
       {method: 'get', parameters: "", onComplete: this.processInfo.bindAsEventListener(this)}
		);
		
	},
	
	// Display Ajax response
	processInfo: function(response){
		if($('lbContent')) {
			Element.remove($('lbContent'));
		}
		info = "<div id='lbContent'>" + response.responseText + "<div id='spinner' class='done'><span>loading</span></div></div>";
		new Insertion.Before($('lbLoadMessage'), info)
		$('lightbox').removeClassName("loading");
		$('lightbox').addClassName("done");	
		this.actions();			
		this.evalAndDeactivates();			
	},
	
	// 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;};
		}

	},
	
	// Search through new links within the lightbox, and attach click event
	evalAndDeactivates: function(){
		lbEvals = document.getElementsByClassName('lbEval');

		for(i = 0; i < lbEvals.length; i++) {
			Event.observe(lbEvals[i], 'click', this["deactivate"].bindAsEventListener(this, lbEvals[i].rel), false);
			lbEvals[i].onclick = function(){return false;};
		}

	},
	
	// Example of creating your own functionality once lightbox is initiated
	insert: function(e){
	   link = Event.element(e);
	   $('spinner').className = "busy";
	   var myAjax = new Ajax.Request(
			  endsWith(link.href, '#') ? link.name : link.href,
			  {method: 'get', parameters: "", onComplete: this.processInfo.bindAsEventListener(this)}
	   );
	
	},
	
	// Example of creating your own functionality once lightbox is initiated
	deactivate: function(e, f){
		if (f) {
			eval(f);
		}
		this.disableKeyboardNav();
		Element.remove($('lbContent'));
		
		if (browser == "Internet Explorer"){
			this.setScroll(0,this.yPos);
			this.prepareIE("auto", "auto");
			this.hideSelects("visible");
		}
		
		this.displayLightbox("none");
	},
	
	//	enableKeyboardNav()
	enableKeyboardNav: function() {
		document.onkeydown = this.keyboardAction;
	},

	//	disableKeyboardNav()
	disableKeyboardNav: function() {
		document.onkeydown = '';
	},

	//	keyboardAction()
	keyboardAction: function(e) {
		escapeKey = 27;
		if (e == null) {						// IE
			keycode = event.keyCode;
		} else {										// Everyone Else
			keycode = e.keyCode;
			if (e.DOM_VK_ESCAPE) {		// Mozilla
				escapeKey = e.DOM_VK_ESCAPE;
			}
		}

		var lbKey;
		if (keycode == escapeKey) {	// Escape Key
			lbKey = document.getElementsByClassName('lbEscape')[0];
		} else if (keycode == 37) {	// Left Arrow Key
			lbKey = document.getElementsByClassName('lbLeftArrow')[0];
		} else if (keycode == 39) {	// Right Arrow Key
			lbKey = document.getElementsByClassName('lbRightArrow')[0];
		}
		if (lbKey) {
			if (browser == "Internet Explorer") {
				lbKey.fireEvent("onclick");
			} else {
				var evObj = document.createEvent('MouseEvents');
				evObj.initEvent( 'click', true, true );
				lbKey.dispatchEvent(evObj);
			}
		}
	}
}

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

// Onload, make all links that need to trigger a lightbox active
function initialize(){
	addLightboxMarkup();
	lightBoxElements();
}

function closeLightBoxFromJavascript(){
	lbCloseButton = document.getElementsByClassName('lbEscape')[0];
	if (lbCloseButton) {
		if (browser == "Internet Explorer") {
			lbCloseButton.fireEvent("onclick");
		} else {
			var evObj = document.createEvent('MouseEvents');
			evObj.initEvent( 'click', true, true );
			lbCloseButton.dispatchEvent(evObj);
		}
	}
}


function lightBoxElements(){
	lbox = document.getElementsByClassName('lbOn');
	for(i = 0; i < lbox.length; i++) {
		if (!lbox[i].hasClassName('lightboxed')) {
			valid = new lightbox(lbox[i]);
			lbox[i].addClassName('lightboxed');
		}
	}
}

// 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.addClassName('loading');
	if (typeof(additional_lightbox_class) != 'undefined') {
		lb.addClassName(additional_lightbox_class);
	}
	lb.innerHTML	= '<div id="lbLoadMessage">' +
						  '<div class="busy"><span>loading</span></div>' +
						  '</div>' +
						  '<div class="lbBottom"></div>';
	bod.appendChild(overlay);
	bod.appendChild(lb);
}