/* kzman.js - Kaluach halachic times Javascript routines
 *   Version 0.01 (initial beta release)
 *   Version 0.02 (fixed bug in display of Shabbat times)
 *   Version 1.00 (fixed bug displaying locations at 0 deg lat/lon)
 *   Version 2.01 (handle invalid sunrise/set, different knissat shabbat times)
 * Copyright (C) 5760,5761 (2000 CE), by Abu Mami and Yisrael Hersch.
 *   All Rights Reserved.
 *   All copyright notices in this script must be left intact.
 * Acknowledgment given to scripts by:
 *   - P. Lutus <lutusp@arachnoid.com>
 *     available under the www.arachnoid.com CareWare program
 *	 - Tomer and Yehuda Shiran (docjs.com)
 *   - irt.org
 *   - javascripter.net
 * Permission will be granted to use this script on your web page
 *   if you wish. All that's required is that you please ask.
 *   (Of course if you want to send a few dollars, that's OK too :-)
 * website: http://www.kaluach.net
 * email: abumami@kaluach.org
 */


var month = 0, day = 0, year = 0;
var lat = 0, lng = 0;	// sun's location
var latd = -1, latm = 0;// lat on earth
var lngd = -1, lngm = 0;// long on earth
var ns = 'N', ew = 'E';	// hemisphere
var dst = 0;			// daylight saving time
var ampm = 1;			// am/pm or 24 hour display


function leap(y) {
	return ((y % 400 == 0) || (y % 100 != 0 && y % 4 == 0));
}

function civMonthLength(month, year) {
	if(month == 2)
		return 28 + leap(year);
	else if(month == 4 || month == 6 || month == 9 || month == 11)
	   return 30;
	else
		return 31;
}

function man_pos(mlatd, mlatm, mns, mlngd, mlngm, mew, d, m, y, gmt, dls) {

	var latd = Math.abs(eval(mlatd));
	var latm = Math.abs(eval(mlatm));
	var ns = mns;

	var lngd = Math.abs(eval(mlngd));
	var lngm = Math.abs(eval(mlngm));
	var ew = mew;

	// in numbers
	var month = m;
	var day   = d;
	var year  = y;


	var ampm=0;

	nsi = (mns=='N') ? 0 : 1;

	ewi = (mew=='W' ) ? 0 : 1;
 
	d = day;
	m = month;
	y = year;
 
	var adj = gmt;
	adj += dls;

	var time;
	var sunrise, sunset;
	var shaa_zmanit;

	time = suntime(d, m, y, 90, 50, lngd, lngm, ewi, latd, latm, nsi, adj);
	if(time[1] == 0) {
		sunrise = time[2];
		sunset  = time[3];
		document.getElementById('hanetz').innerHTML = "<span class='style30'>"+timeadj(sunrise, ampm)+"</span>";
		document.getElementById('shkia').innerHTML = "<span class='style30'>"+timeadj(sunset, ampm)+"</span>";
		shaa_zmanit = (sunset - sunrise) / 12;
	}
	else {
		document.getElementById('hanetz').innerHTML = "";
		document.getElementById('shkia').innerHTML = "";
	}

	time = suntime(d, m, y, 106, 6, lngd, lngm, ewi, latd, latm, nsi, adj);
	if(time[1] == 0)
		document.getElementById('alot').innerHTML = "<span class='style30'>"+timeadj(time[2], ampm)+"</span>";
	else
		document.getElementById('alot').innerHTML = "";

	time = suntime(d, m, y, 101, 0, lngd, lngm, ewi, latd, latm, nsi, adj);
	if(time[1] == 0)
		document.getElementById('misheyakir').innerHTML = "<span class='style30'>"+timeadj(time[2], ampm)+"</span>";
	else
		document.getElementById('misheyakir').innerHTML = "";

	time = suntime(d, m, y, 96, 0, lngd, lngm, ewi, latd, latm, nsi, adj);
	if(time[1] == 0)
		document.getElementById('tzeit').innerHTML = "<span class='style30'>"+timeadj(time[3], ampm)+"</span>";
	else	
		document.getElementById('tzeit').innerHTML = "";

	document.getElementById('shema').innerHTML    = "<span class='style30'>"+timeadj(sunrise + shaa_zmanit * 3, ampm)+"</span>";
	document.getElementById('tefillah').innerHTML = "<span class='style30'>"+timeadj(sunrise + shaa_zmanit * 4, ampm)+"</span>";
	document.getElementById('chatzot').innerHTML  = "<span class='style30'>"+timeadj(sunrise + shaa_zmanit * 6, ampm)+"</span>";
	document.getElementById('minchag').innerHTML  = "<span class='style30'>"+timeadj(sunrise + shaa_zmanit * 6.5, ampm)+"</span>";
	document.getElementById('minchak').innerHTML  = "<span class='style30'>"+timeadj(sunrise + shaa_zmanit * 9.5, ampm)+"</span>";
	document.getElementById('plag').innerHTML= "<span class='style30'>"+timeadj(sunrise + shaa_zmanit * 10.75, ampm)+"</span>";

	var yom = new Date (y, m-1, d);
	yom.setDate(yom.getDate()+(6-yom.getDay()));
	var day_before = new Date(yom.getTime() - 86400000);

	y=yom.getYear();
	d=yom.getDate();
	m=yom.getMonth()+1;
	document.getElementById('shabatdate').innerHTML= "<span class='style30'>"+d+"/"+m+"/"+y+"</span>";

	if (yom.getDay() == 6) {

		// motzei shabbat (3 small stars)
		time = suntime(d, m, y, 98, 30, lngd, lngm, ewi, latd, latm, nsi, adj);
		if(time[1] == 0)
			document.getElementById('motzeiShabbat').innerHTML = "<span class='style30'>"+timeadj(time[3], ampm)+"</span>";
		else
			document.getElementById('motzeiShabbat').innerHTML = "";

		// knissat shabbat (sunset from day before)

		db = day_before.getDate();
		mb = day_before.getMonth()+1;
		yb = day_before.getYear();
		if(yb < 1900)
			yb += 1900;		
		
		time = suntime(db, mb, yb, 90, 50, lngd, lngm, ewi, latd, latm, nsi, adj);
		document.getElementById('knissatShabbat').innerHTML = "<span class='style30'>"+timeadj(time[3] - 18.0/60.0, ampm)+"</span>";
	}
	else {
		document.getElementById('motzeiShabbat').innerHTML = '';
		document.getElementById('knissatShabbat').innerHTML = '';
	}

}