var SECONDS_IN_YEAR = 31556926;
var SECONDS_IN_DAY = 86400;
var SECONDS_IN_HOUR = 3600;
var SECONDS_IN_MINUTE = 60;
var SECONDS_IN_SECOND = 1;


var load_date = new Date();



function countdown()
{
	var timeleft = document.getElementById("timeleft").value;
	var d = new Date();
	document.getElementById("countdown").innerHTML= get_time_left_string(parseFloat(timeleft) - ((d.getTime() - load_date.getTime())/1000));
	setTimeout("countdown()",100);
}

function moore()
{
	var timesince4004 = document.getElementById("timesince4004").value;
	var d = new Date();
	document.getElementById("moorelaw").innerHTML= get_transistors(parseFloat(timesince4004) + ((d.getTime() - load_date.getTime())/1000));
	setTimeout("moore()",100);
}

function get_transistors(t)
{
	//the first processor had 2300 transistors doubling every two years
	var transistors = 2300 * Math.pow(2,(t/(SECONDS_IN_YEAR*2)));
	return Math.floor(transistors);
}

function get_people_online(t)
{
	//in 2009 there were 1,733,993,741 people online last 9 years saw 380% growth
	
	var people = 1733993741 + ((t/(5*SECONDS_IN_YEAR))*0.45*1733993741);
	return Math.floor(people);
}

function people_online()
{
	var elapsedsince2009 = document.getElementById("elapsedsince2009").value;
	var d = new Date();
	document.getElementById("people_online").innerHTML = get_people_online(parseFloat(elapsedsince2009) + ((d.getTime() - load_date.getTime())/1000));
	setTimeout("people_online()",100);	
}



function get_time_left_string(t)
{
	var years = Math.floor(t/SECONDS_IN_YEAR);
	t = t-(SECONDS_IN_YEAR*years);
	var days = Math.floor(t/SECONDS_IN_DAY);
	t = t-(SECONDS_IN_DAY*days);
	var hours = Math.floor(t/SECONDS_IN_HOUR);
	t = t-(SECONDS_IN_HOUR*hours);
	var minutes = Math.floor(t/SECONDS_IN_MINUTE);
	t = t-(SECONDS_IN_MINUTE*minutes);
	var seconds = Math.floor(t/SECONDS_IN_SECOND);
	t = t-(SECONDS_IN_SECOND*seconds);
	var tenmilliseconds = Math.floor(t*10);

	return make_plural('Year',years) + ' ' + make_plural('Day',days) + ' ' + make_plural('Hour',hours) + ' ' + make_plural('Minute',minutes) + ' ' + make_plural('.' + tenmilliseconds + ' Second',seconds);
}

function make_plural(word,n)
{
	//add an s if we need to
	if(n==1)
	{

		return n + ' ' + word;
	}

	return n + ' ' + word + 's';
}