/*

uuid.js - Version 0.1
JavaScript Class to create a UUID like identifier

Copyright (C) 2006, Erik Giberti (AF-Design), All rights reserved.

The latest version of this file can be downloaded from
http://www.af-design.com/resources/javascript_uuid.php


*/


// on creation of a UUID object, set it's initial value
function UUID(){
	this.id = this.createUUID();
}



UUID.prototype.valueOf = function(){ return this.id; }
UUID.prototype.toString = function(){ return this.id; }


UUID.prototype.createUUID = function(){
	var dg = UUID.timeInMs(new Date(1582, 10, 15, 0, 0, 0, 0));
	var dc = UUID.timeInMs(new Date());
	var t = dc - dg;
	var h = '-';
	var tl = UUID.getIntegerBits(t,0,31);
	var tm = UUID.getIntegerBits(t,32,47);
	var thv = UUID.getIntegerBits(t,48,59) + '1'; // version 1, security version is 2
	var csar = UUID.getIntegerBits(UUID.randrange(0,4095),0,7);
	var csl = UUID.getIntegerBits(UUID.randrange(0,4095),0,7);

	var n = UUID.getIntegerBits(UUID.randrange(0,8191),0,7) + 
			UUID.getIntegerBits(UUID.randrange(0,8191),8,15) + 
			UUID.getIntegerBits(UUID.randrange(0,8191),0,7) + 
			UUID.getIntegerBits(UUID.randrange(0,8191),8,15) + 
			UUID.getIntegerBits(UUID.randrange(0,8191),0,15); // this last number is two octets long
	return tl + h + tm + h + thv + h + csar + csl + h + n; 
}


UUID.getIntegerBits = function(val,start,end){
	var base16 = UUID.returnBase(val,16);
	var quadArray = new Array();
	var quadString = '';
	var i = 0;
	for(i=0;i<base16.length;i++){
		quadArray.push(base16.substring(i,i+1));	
	}
	for(i=Math.floor(start/4);i<=Math.floor(end/4);i++){
		if(!quadArray[i] || quadArray[i] == '') quadString += '0';
		else quadString += quadArray[i];
	}
	return quadString;
}

UUID.returnBase = function(number, base){
	//
	// Copyright 1996-2006 irt.org, All Rights Reserved.	
	//
	// Downloaded from: http://www.irt.org/script/146.htm	
	// modified to work in this class by Erik Giberti
	var convert = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'];
    if (number < base) var output = convert[number];
    else {
        var MSD = '' + Math.floor(number / base);
        var LSD = number - MSD*base;
        if (MSD >= base) var output = this.returnBase(MSD,base) + convert[LSD];
        else var output = convert[MSD] + convert[LSD];
    }
    return output;
}

UUID.timeInMs = function(d){
	var ms_per_second = 100; // constant
	var ms_per_minute = 6000; // ms_per second * 60;
	var ms_per_hour   = 360000; // ms_per_minute * 60;
	var ms_per_day    = 8640000; // ms_per_hour * 24;
	var ms_per_month  = 207360000; // ms_per_day * 30;
	var ms_per_year   = 75686400000; // ms_per_day * 365;
	return Math.abs((d.getUTCFullYear() * ms_per_year) + (d.getUTCMonth() * ms_per_month) + (d.getUTCDate() * ms_per_day) + (d.getUTCHours() * ms_per_hour) + (d.getUTCMinutes() * ms_per_minute) + (d.getUTCSeconds() * ms_per_second) + d.getUTCMilliseconds());
}

UUID.randrange = function(min,max){
	var num = Math.round(Math.random() * max);
	if(num < min){ 
		num = min;
	} else if (num > max) {
		num = max;
	}
	return num;
}

// end of UUID class file