var FBCinstance=null;

function FBC()
{
	if (!FBCinstance) FBCinstance=this; else return FBCinstance;
		
	this.queryUrl="/Ajax/Facebook.aspx";					//relative path to Explorica site interface
	this.loginUrl="/FB.aspx?from=" + escape(document.location) + "&hash=";
	this.logoutUrl="/My-Account.aspx?logout=true";
	this.syncUrl = "/my-account/link-facebook-account.aspx";
	this.receiverFile="/xd_receiver.html";				//location of cross domain communications file 	
	this.apiKey=Explorica.FB.key;
	this.sessionUrl="Session.php";						//testing environment session file for session vars
	this.api=null;										//will become facebook api object						
	this.enrolled=null;									//uids of travelers enrolled in this trip (tcCode)	
	this.username=Explorica.FB.username;
	this.tcCode=Explorica.FB.tcCode;	
	this.hash=Explorica.FB.hash;	
	this.token=Explorica.FB.authToken;					// session token for ajax db calls	
	this.uid=null;	
	
	this.callMethod=function(methodName,params,callback)
	{
		//calls an api method from server-side api catalog
		this.api.callMethod(methodName,params,callback);	
	}
	
	this.onReady=function()
	{	
		this.loadUserData(this.uid);		
	}
	
	this.login=function()
	{
		//return false if user is not connected to FB
		if (!this.refresh()) return false;
		this.setHash();				//set the hash value for the user
	}
	
	this.logout=function(redirect)
	{
		if (!redirect)
		{
			FB.Connect.logout(function() { new FBC().logout(1) } );		 
		}
		else
		{
			 
			location.href=this.logoutUrl;
		}
	
	}
	this.sendHash=function()
	{	
			var url=this.queryUrl + "?mode=setHash";
			var params={
				"hash":this.userHash
				,"uid":this.uid
				,"username":this.username
				,"token":this.token
			
			};
			$.post(url,params,function(){return true;},"json");
			if (debugMode)
				location.href=document.location;
			else
				location.href=this.loginUrl	+ this.userHash + "&uid=" + this.uid;
				
	}
	this.setHash = function() {
		//this person is not logged onto Explorica, forget it
		if (!this.username) {
			location.href = this.loginUrl + "&uid=" + this.uid;
			return false;
		} else if (typeof this.hasAccount == "undefined") {
			//no email hash from Facebook yet or account confirmation from Explorica so wait until call completes
			this.accountStatus();
			setTimeout(function() { new FBC().setHash(); }, 100);
			return false;
		}

		//only set this is no FB/Explorica account tether exists
		if (!this.hasAccount) location.href = this.syncUrl + "?from=" + escape(document.location);
		else location.href = this.loginUrl + "&uid=" + this.uid;
	}

	this.tourFriends = function(result) {
		//draw a list friends on this tour
		var target = ".tourfriends.fb";
		this.enrolled = result;

		if (!$(target).length) return false;

		for (var r in result) {
			this.friendThumb(result[r], target);
		}
	}
	this.friendThumb = function(uid, target) {
		//add a facebook thumbnail for a user
		var html = String.format("<div class='friend'><fb:name uid='{0}' linked='false' useyou='false' ifcantsee=''></fb:name><br /><fb:profile-pic uid='{0}' size='q' linked='false'></fb:profile-pic></div>", uid);
		var container = $(html).appendTo(target).get(0);
		FB.XFBML.Host.parseDomElement(container);
	}
	this.liveStream=function()
	{
		var target=".fb.stream";
		if (!$(target).length) return false;
		var parentWidth=parseInt($(target).css("width"));		
		var attr={"xid":this.tcCode};		
		if (parentWidth)
			attr["width"]=parentWidth + "px";
		var container = $("<div></div>").attr(attr).appendTo(target).get(0);
		var streamBox = new FB.XFBML.LiveStream(container);
		FB.XFBML.Host.addElement(streamBox); 
	}
	this.accountStatus = function(result) {
		//called from refresh()		
		if (typeof result == "undefined") {
			var url = this.queryUrl + "?mode=check";
			var params = { "uid": this.uid, "token": this.token };
			var x = this;
			$.post(url, params, function(res) { x.hasAccount = res; }, "json");
			return false;
		}

		this.hasAccount = result;
		return true;
	}
	this.getEnrolled = function(result) {
		var url = this.queryUrl + "?mode=members";
		var params = { "tcCode": this.tcCode, "token": this.token };
		$.post(url, params, function(ids) { FBC().tourFriends(ids); }, "json");
		return false;
	}
	
	this.loadUserData=function(uid,result)
	{
		if (typeof result =="undefined")
		{
			this.api.users_getInfo(uid,["first_name","name","profile_url","proxied_email","email_hashes"],function(result, exception){FBC().loadUserData(uid,result[0]); });
			return false;	
		}	
    	this.userEmail=result["proxied_email"];
    	this.userHash=result["proxied_email"];
	}
 
	this.refresh=function()
	{		
		if(this.api.get_session())
		{
			//Facebook Session
			this.uid=this.api.get_session().uid;
			this.accountStatus();
			this.reveal();	
			this.liveStream();
			//this.onReady();
			return true;
		}	
		else
		{
		 	//No Facebook Session
			if (this.hash)
			{
 				//acct tied to FB already
 				//prompt auto FB login
			}
			//hide controls
			$(".fb").css({"display":"none"});
			$(".fb.login").css({"display":"block"});			
			return false;
		}	
	}
	this.reveal=function()
	{
		$(".fb").css({"display":"block"});
		$(".fb.login").css({"display":"none"});
	}
}
/*
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 * Digest Algorithm, as defined in RFC 1321.
 * Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */
var hexcase=0;function hex_md5(a){return rstr2hex(rstr_md5(str2rstr_utf8(a)))}function hex_hmac_md5(a,b){return rstr2hex(rstr_hmac_md5(str2rstr_utf8(a),str2rstr_utf8(b)))}function md5_vm_test(){return hex_md5("abc").toLowerCase()=="900150983cd24fb0d6963f7d28e17f72"}function rstr_md5(a){return binl2rstr(binl_md5(rstr2binl(a),a.length*8))}function rstr_hmac_md5(c,f){var e=rstr2binl(c);if(e.length>16){e=binl_md5(e,c.length*8)}var a=Array(16),d=Array(16);for(var b=0;b<16;b++){a[b]=e[b]^909522486;d[b]=e[b]^1549556828}var g=binl_md5(a.concat(rstr2binl(f)),512+f.length*8);return binl2rstr(binl_md5(d.concat(g),512+128))}function rstr2hex(c){try{hexcase}catch(g){hexcase=0}var f=hexcase?"0123456789ABCDEF":"0123456789abcdef";var b="";var a;for(var d=0;d<c.length;d++){a=c.charCodeAt(d);b+=f.charAt((a>>>4)&15)+f.charAt(a&15)}return b}function str2rstr_utf8(c){var b="";var d=-1;var a,e;while(++d<c.length){a=c.charCodeAt(d);e=d+1<c.length?c.charCodeAt(d+1):0;if(55296<=a&&a<=56319&&56320<=e&&e<=57343){a=65536+((a&1023)<<10)+(e&1023);d++}if(a<=127){b+=String.fromCharCode(a)}else{if(a<=2047){b+=String.fromCharCode(192|((a>>>6)&31),128|(a&63))}else{if(a<=65535){b+=String.fromCharCode(224|((a>>>12)&15),128|((a>>>6)&63),128|(a&63))}else{if(a<=2097151){b+=String.fromCharCode(240|((a>>>18)&7),128|((a>>>12)&63),128|((a>>>6)&63),128|(a&63))}}}}}return b}function rstr2binl(b){var a=Array(b.length>>2);for(var c=0;c<a.length;c++){a[c]=0}for(var c=0;c<b.length*8;c+=8){a[c>>5]|=(b.charCodeAt(c/8)&255)<<(c%32)}return a}function binl2rstr(b){var a="";for(var c=0;c<b.length*32;c+=8){a+=String.fromCharCode((b[c>>5]>>>(c%32))&255)}return a}function binl_md5(p,k){p[k>>5]|=128<<((k)%32);p[(((k+64)>>>9)<<4)+14]=k;var o=1732584193;var n=-271733879;var m=-1732584194;var l=271733878;for(var g=0;g<p.length;g+=16){var j=o;var h=n;var f=m;var e=l;o=md5_ff(o,n,m,l,p[g+0],7,-680876936);l=md5_ff(l,o,n,m,p[g+1],12,-389564586);m=md5_ff(m,l,o,n,p[g+2],17,606105819);n=md5_ff(n,m,l,o,p[g+3],22,-1044525330);o=md5_ff(o,n,m,l,p[g+4],7,-176418897);l=md5_ff(l,o,n,m,p[g+5],12,1200080426);m=md5_ff(m,l,o,n,p[g+6],17,-1473231341);n=md5_ff(n,m,l,o,p[g+7],22,-45705983);o=md5_ff(o,n,m,l,p[g+8],7,1770035416);l=md5_ff(l,o,n,m,p[g+9],12,-1958414417);m=md5_ff(m,l,o,n,p[g+10],17,-42063);n=md5_ff(n,m,l,o,p[g+11],22,-1990404162);o=md5_ff(o,n,m,l,p[g+12],7,1804603682);l=md5_ff(l,o,n,m,p[g+13],12,-40341101);m=md5_ff(m,l,o,n,p[g+14],17,-1502002290);n=md5_ff(n,m,l,o,p[g+15],22,1236535329);o=md5_gg(o,n,m,l,p[g+1],5,-165796510);l=md5_gg(l,o,n,m,p[g+6],9,-1069501632);m=md5_gg(m,l,o,n,p[g+11],14,643717713);n=md5_gg(n,m,l,o,p[g+0],20,-373897302);o=md5_gg(o,n,m,l,p[g+5],5,-701558691);l=md5_gg(l,o,n,m,p[g+10],9,38016083);m=md5_gg(m,l,o,n,p[g+15],14,-660478335);n=md5_gg(n,m,l,o,p[g+4],20,-405537848);o=md5_gg(o,n,m,l,p[g+9],5,568446438);l=md5_gg(l,o,n,m,p[g+14],9,-1019803690);m=md5_gg(m,l,o,n,p[g+3],14,-187363961);n=md5_gg(n,m,l,o,p[g+8],20,1163531501);o=md5_gg(o,n,m,l,p[g+13],5,-1444681467);l=md5_gg(l,o,n,m,p[g+2],9,-51403784);m=md5_gg(m,l,o,n,p[g+7],14,1735328473);n=md5_gg(n,m,l,o,p[g+12],20,-1926607734);o=md5_hh(o,n,m,l,p[g+5],4,-378558);l=md5_hh(l,o,n,m,p[g+8],11,-2022574463);m=md5_hh(m,l,o,n,p[g+11],16,1839030562);n=md5_hh(n,m,l,o,p[g+14],23,-35309556);o=md5_hh(o,n,m,l,p[g+1],4,-1530992060);l=md5_hh(l,o,n,m,p[g+4],11,1272893353);m=md5_hh(m,l,o,n,p[g+7],16,-155497632);n=md5_hh(n,m,l,o,p[g+10],23,-1094730640);o=md5_hh(o,n,m,l,p[g+13],4,681279174);l=md5_hh(l,o,n,m,p[g+0],11,-358537222);m=md5_hh(m,l,o,n,p[g+3],16,-722521979);n=md5_hh(n,m,l,o,p[g+6],23,76029189);o=md5_hh(o,n,m,l,p[g+9],4,-640364487);l=md5_hh(l,o,n,m,p[g+12],11,-421815835);m=md5_hh(m,l,o,n,p[g+15],16,530742520);n=md5_hh(n,m,l,o,p[g+2],23,-995338651);o=md5_ii(o,n,m,l,p[g+0],6,-198630844);l=md5_ii(l,o,n,m,p[g+7],10,1126891415);m=md5_ii(m,l,o,n,p[g+14],15,-1416354905);n=md5_ii(n,m,l,o,p[g+5],21,-57434055);o=md5_ii(o,n,m,l,p[g+12],6,1700485571);l=md5_ii(l,o,n,m,p[g+3],10,-1894986606);m=md5_ii(m,l,o,n,p[g+10],15,-1051523);n=md5_ii(n,m,l,o,p[g+1],21,-2054922799);o=md5_ii(o,n,m,l,p[g+8],6,1873313359);l=md5_ii(l,o,n,m,p[g+15],10,-30611744);m=md5_ii(m,l,o,n,p[g+6],15,-1560198380);n=md5_ii(n,m,l,o,p[g+13],21,1309151649);o=md5_ii(o,n,m,l,p[g+4],6,-145523070);l=md5_ii(l,o,n,m,p[g+11],10,-1120210379);m=md5_ii(m,l,o,n,p[g+2],15,718787259);n=md5_ii(n,m,l,o,p[g+9],21,-343485551);o=safe_add(o,j);n=safe_add(n,h);m=safe_add(m,f);l=safe_add(l,e)}return Array(o,n,m,l)}function md5_cmn(h,e,d,c,g,f){return safe_add(bit_rol(safe_add(safe_add(e,h),safe_add(c,f)),g),d)}function md5_ff(g,f,k,j,e,i,h){return md5_cmn((f&k)|((~f)&j),g,f,e,i,h)}function md5_gg(g,f,k,j,e,i,h){return md5_cmn((f&j)|(k&(~j)),g,f,e,i,h)}function md5_hh(g,f,k,j,e,i,h){return md5_cmn(f^k^j,g,f,e,i,h)}function md5_ii(g,f,k,j,e,i,h){return md5_cmn(k^(f|(~j)),g,f,e,i,h)}function safe_add(a,d){var c=(a&65535)+(d&65535);var b=(a>>16)+(d>>16)+(c>>16);return(b<<16)|(c&65535)}function bit_rol(a,b){return(a<<b)|(a>>>(32-b))};