/*
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,place;

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

//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;
}

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

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 = 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(e){
		e.stop();
		if (browser == 'Internet Explorer'){
			this.getScroll();
			this.prepareIE('100%', 'hidden');
			this.setScroll(0,0);
			this.hideSelects('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){
		var bod = document.getElementsByTagName('body')[0];
		bod.style.height = height;
		bod.style.overflow = overflow;

		var 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){
		var selects = document.getElementsByTagName('select');
		for(var 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){
        // Remove murkup each time lb is closed and create it again on opening.
        // Otherwise IE sometimes breaks Flash displaying
        if(display == 'block') {
            addLightboxMarkup();
            $('overlay').style.display = 'block';
            $('lightbox').style.display = 'block';
        } else {
            $('overlay').remove();
            $('lightbox').remove();
        }

		if(display != 'none') this.loadInfo();
	},

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

	// Display Ajax response
	processInfo: function(response){
		var info = "<div id='lbContent'>" + response.responseText + "</div>";
		new Insertion.Before($('lbLoadMessage'), info);
		$('lightbox').className = "done";
        this.center();
		this.actions();
        window.onscroll = this.center;
	},
	center : function(){
		Position.Center($('lightbox'));
    },
	// Search through new links within the lightbox, and attach click event
	actions: function(){
		var lbActions = $$('.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;};
		}

        $('lbContent').select('.cal').each(function(el){
            new Calendar(el);
        });

	},

	// Example of creating your own functionality once lightbox is initiated
	insert: function(e){
	   var link = Event.element(e); //.parentNode;
	   Element.remove($('lbContent'));

	   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");
        window.onscroll = '';
	}
};

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

// Onload, make all links that need to trigger a lightbox active
function initialize(){
	$$('.lbOn').each(function(lb) {
        new lightbox(lb);
    });
}

// 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 = document.getElementsByTagName('body')[0];
	var overlay = document.createElement('div');
	overlay.id = 'overlay';
	var lb = document.createElement('div');
	lb.id = 'lightbox';
	lb.className = 'loading';
	lb.innerHTML = '<div id="lbLoadMessage"><p>Loading</p></div>';
	bod.appendChild(overlay);
	bod.appendChild(lb);
}

/************ window dimensions *************/
//Prototype-based javascript window dimensions
//http://textsnippets.com/posts/show/835
Position.GetWindowSize = function(w) {
      w = w ? w : window;
      var width = w.innerWidth || (w.document.documentElement.clientWidth || w.document.body.clientWidth);
      var height = w.innerHeight || (w.document.documentElement.clientHeight || w.document.body.clientHeight);
      return [width, height]
}

/************ center DOM element *************/
//Center a DOM element, prototype based
//http://textsnippets.com/posts/show/836
Position.Center = function(element, parent) {
	var w, h, pw, ph;
	var d = Element.getDimensions(element);
	w = d.width;
	h = d.height;
	Position.prepare();
	if (!parent) {
			var ws = Position.GetWindowSize();
			pw = ws[0];
			ph = ws[1];
	} else {
			pw = parent.offsetWidth;
			ph = parent.offsetHeight;
	}
	element.style.top = (ph/2) - (h/2) +  Position.deltaY + "px";
	element.style.left = (pw/2) - (w/2) +  Position.deltaX + "px";
	element.style.position='absolute';
}