/*
 * AlphabetClock
 * Javascript Object Version of Alphabetic Clock on www.alphabetClock.com site by Wyatt Greene
 * Object version by John Howard, FJRNR
 * MIT license
 * 
	var myclock = new alphabeticClock("myclock");  //have to pass in name of instance for timer to call its run() function
	//you can break the time up into separate parts to display in separate divs 
	myclock.addOutputDiv(document.getElementById('timediv'),6,9);  //pass in div and substring to display in that div
	myclock.addOutputDiv(document.getElementById('daydiv'),0,6);   //it will adjust clock frequency as necessary (or change timertime directly)
	myclock.addOutputDiv(document.getElementById('subsecondsdiv'),9,11);
	myclock.start();
*
* this also defines new Date function toAlphabetic(startpos,endpos) to return alphabeticDay from any date object.
	d = new Date;
	alert(d.toAlphabetic(2,10)); 
*
* and standalone function calculateLocalDate(wtf) that takes a wtf date and returns a date object
	d = calculateLocalDate("FJRNI:COFFEE");
	alert(d.toString());
*	
*/

function alphabeticClock(myinstancename) {
	this.timertime=1000;
	this.listeners = new Array;
	this.running = false;
	this.addOutputDiv = function(div, startplace, stopplace){
		listener = new Array(div, startplace, stopplace, '');  //3rd element will hold saved time for comparison
		this.listeners.push(listener);
		this.listeners.sort(sortbyhighestprecision);
		//set timer to highest precision
		highestprecision = this.listeners[0][2];
		if (highestprecision>7){
			this.timertime = 86400000/(Math.pow(26,highestprecision-6));
		}
	}

	this.start = function(){
		this.running=true;
		this.run();
	}
	this.stop = function(){
		this.running = false;
	}
	
	this.run = function(){
		now = new Date;
  		julianday = now.valueOf()/86400000 + 2440587.5; //86400000 is millesconds in a day, 2440587.5 juliandate of Jan 1 1970   		 
  		b26 = julianday.toString(26)+"00000";//returns string of base 26 but 0...9a...p (add zero padding for when it rounds to short string)
  		for (l in this.listeners){
  			listener = this.listeners[l];
  			if (listener[3] == b26.substring(listener[1],listener[2])){
  				break; 
  			}else{
	  			listener[3] = b26.substring(listener[1],listener[2]);
	  			listener[0].innerHTML = b26toAlpha(listener[3]);
	  		}
  		}
  		if (this.running) setTimeout(myinstancename+".run()", this.timertime );  
	}
}

function b26toAlpha(str){
   	arr = new Array;
   	for (i=0;i<str.length;i++) {
   		c = str.charCodeAt(i); 
   		if (c > 96){
   			arr[i] = String.fromCharCode(c - 22);  //lower case a-p -> K-Z
   		}else if(c > 46){
   			arr[i] = String.fromCharCode(c + 17);  //number 0-9 -> A-J
   		}else{
   			arr[i] = String.fromCharCode(58);  //. -> :
   		}
   	}
   	return arr.join('');
}

function sortbyhighestprecision(a, b)
{
  if (a[2] > b[2])
     return -1;
  if (a[2] < b[2])
     return 1;
  return 0;
}


function calculateLocalDate(wtf) {
  if (wtf.indexOf(":")==-1) wtf = ":"+wtf;	
  wtf = wtf.split(":");
  wtfdate=wtf[0];
  wtftime=wtf[1];
  	
  var days = 0;
  now = new Date;
  defaultmask = now.toAlphabetic(0,5);
  wtfdate = defaultmask.substring(0,5-wtfdate.length) + wtfdate;

  //compute julian days
  for (i=0;i<5;i++) days += (wtfdate.charCodeAt(i)-65) * Math.pow(26,4-i);
  //compute fractional portion
  for (i=0;i<wtftime.length;i++) days += ((wtftime.charCodeAt(i)-65) / Math.pow(26,i+1));

  var d = new Date();
  d.setTime((days-2440587.5 )*86400000);
  return d;
}

Date.prototype.toAlphabetic = function (s,e) {
	return b26toAlpha((this.valueOf()/86400000 + 2440587.5).toString(26)).substring(s,e); 
};

/*
 * Date Format 1.2.2
 * (c) 2007-2008 Steven Levithan <stevenlevithan.com>
 * MIT license
 * Includes enhancements by Scott Trenda <scott.trenda.net> and Kris Kowal <cixar.com/~kris.kowal/>
 *
 * Accepts a date, a mask, or a date and a mask.
 * Returns a formatted version of the given date.
 * The date defaults to the current date/time.
 * The mask defaults to dateFormat.masks.default.
 */
var dateFormat = function () {
	var	token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,
		timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,
		timezoneClip = /[^-+\dA-Z]/g,
		pad = function (val, len) {
			val = String(val);
			len = len || 2;
			while (val.length < len) val = "0" + val;
			return val;
		};

	// Regexes and supporting functions are cached through closure
	return function (date, mask, utc) {
		var dF = dateFormat;

		// You can't provide utc if you skip other args (use the "UTC:" mask prefix)
		if (arguments.length == 1 && (typeof date == "string" || date instanceof String) && !/\d/.test(date)) {
			mask = date;
			date = undefined;
		}

		// Passing date through Date applies Date.parse, if necessary
		date = date ? new Date(date) : new Date();
		if (isNaN(date)) throw new SyntaxError("invalid date");

		mask = String(dF.masks[mask] || mask || dF.masks["default"]);

		// Allow setting the utc argument via the mask
		if (mask.slice(0, 4) == "UTC:") {
			mask = mask.slice(4);
			utc = true;
		}

		var	_ = utc ? "getUTC" : "get",
			d = date[_ + "Date"](),
			D = date[_ + "Day"](),
			m = date[_ + "Month"](),
			y = date[_ + "FullYear"](),
			H = date[_ + "Hours"](),
			M = date[_ + "Minutes"](),
			s = date[_ + "Seconds"](),
			L = date[_ + "Milliseconds"](),
			o = utc ? 0 : date.getTimezoneOffset(),
			flags = {
				d:    d,
				dd:   pad(d),
				ddd:  dF.i18n.dayNames[D],
				dddd: dF.i18n.dayNames[D + 7],
				m:    m + 1,
				mm:   pad(m + 1),
				mmm:  dF.i18n.monthNames[m],
				mmmm: dF.i18n.monthNames[m + 12],
				yy:   String(y).slice(2),
				yyyy: y,
				h:    H % 12 || 12,
				hh:   pad(H % 12 || 12),
				H:    H,
				HH:   pad(H),
				M:    M,
				MM:   pad(M),
				s:    s,
				ss:   pad(s),
				l:    pad(L, 3),
				L:    pad(L > 99 ? Math.round(L / 10) : L),
				t:    H < 12 ? "a"  : "p",
				tt:   H < 12 ? "am" : "pm",
				T:    H < 12 ? "A"  : "P",
				TT:   H < 12 ? "AM" : "PM",
				Z:    utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),
				o:    (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
				S:    ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
			};

		return mask.replace(token, function ($0) {
			return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
		});
	};
}();

// Some common format strings
dateFormat.masks = {
	"default":      "ddd mmm dd yyyy HH:MM:ss",
	shortDate:      "m/d/yy",
	mediumDate:     "mmm d, yyyy",
	longDate:       "mmmm d, yyyy",
	fullDate:       "dddd, mmmm d, yyyy",
	shortTime:      "h:MM TT",
	mediumTime:     "h:MM:ss TT",
	longTime:       "h:MM:ss TT Z",
	isoDate:        "yyyy-mm-dd",
	isoTime:        "HH:MM:ss",
	isoDateTime:    "yyyy-mm-dd'T'HH:MM:ss",
	isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"
};

// Internationalization strings
dateFormat.i18n = {
	dayNames: [
		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
		"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
	],
	monthNames: [
		"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
		"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
	]
};

// For convenience...
Date.prototype.format = function (mask, utc) {
	return dateFormat(this, mask, utc);
};