var times = new Array(5, 6, 12, 13, 18, 18, 18); //default times
var point = new Array('كاشان', '33.98399', '51.43647');
function PrayTime() {

    //--------------------- User Interface -----------------------
    /* 

	getPrayerTimes (date, latitude, longitude, timeZone)
    getDatePrayerTimes (year, month, day, latitude, longitude, timeZone)

	setCalcMethod (methodID)
    setAsrMethod (methodID)

	setFajrAngle (angle)
    setMaghribAngle (angle)
    setIshaAngle (angle)
    setDhuhrMinutes (minutes)	// minutes after mid-day
    setMaghribMinutes (minutes)	// minutes after sunset
    setIshaMinutes (minutes)	// minutes after maghrib

	setHighLatsMethod (methodID)	// adjust method for higher latitudes

	setTimeFormat (timeFormat)	
    floatToTime24 (time)
    floatToTime12 (time)
    floatToTime12NS (time)

*/
    //------------------------ Constants --------------------------


    // Calculation Methods
    this.Jafari = 0;    // Ithna Ashari
    this.Karachi = 1;    // University of Islamic Sciences, Karachi
    this.ISNA = 2;    // Islamic Society of North America (ISNA)
    this.MWL = 3;    // Muslim World League (MWL)
    this.Makkah = 4;    // Umm al-Qura, Makkah
    this.Egypt = 5;    // Egyptian General Authority of Survey
    this.Custom = 6;    // Custom Setting
    this.Tehran = 7;    // Institute of Geophysics, University of Tehran

    // Juristic Methods
    this.Shafii = 0;    // Shafii (standard)
    this.Hanafi = 1;    // Hanafi

    // Adjusting Methods for Higher Latitudes
    this.None = 0;    // No adjustment
    this.MidNight = 1;    // middle of night
    this.OneSeventh = 2;    // 1/7th of night
    this.AngleBased = 3;    // angle/60th of night


    // Time Formats
    this.Time24 = 0;    // 24-hour format
    this.Time12 = 1;    // 12-hour format
    this.Time12NS = 2;    // 12-hour format with no suffix
    this.Float = 3;    // floating point number 

    // Time Names
    this.timeNames = new Array(
		'Fajr',
		'Sunrise',
		'Dhuhr',
		'Asr',
		'Sunset',
		'Maghrib',
		'Isha'
	);

    this.InvalidTime = '-----';  // The string used for invalid times


    //---------------------- Global Variables --------------------


    this.calcMethod = 0; 	// caculation method
    this.asrJuristic = 0; 	// Juristic method for Asr
    this.dhuhrMinutes = 0; 	// minutes after mid-day for Dhuhr
    this.adjustHighLats = 1; // adjusting method for higher latitudes

    this.timeFormat = 0; 	// time format

    var lat;        // latitude 
    var lng;        // longitude 
    var timeZone;   // time-zone 
    var JDate;      // Julian date


    //--------------------- Technical Settings --------------------


    this.numIterations = 1; 	// number of iterations needed to compute times




    //------------------- Calc Method Parameters --------------------


    this.methodParams = new Array();

    /*  this.methodParams[methodNum] = new Array(fa, ms, mv, is, iv);	
	
			fa : fajr angle
    ms : maghrib selector (0 = angle; 1 = minutes after sunset)
    mv : maghrib parameter value (in angle or minutes)
    is : isha selector (0 = angle; 1 = minutes after maghrib)
    iv : isha parameter value (in angle or minutes)
    */

    this.methodParams[this.Jafari] = new Array(16, 0, 4, 0, 14);
    this.methodParams[this.Karachi] = new Array(18, 1, 0, 0, 18);
    this.methodParams[this.ISNA] = new Array(15, 1, 0, 0, 15);
    this.methodParams[this.MWL] = new Array(18, 1, 0, 0, 17);
    this.methodParams[this.Makkah] = new Array(19, 1, 0, 1, 90);
    this.methodParams[this.Egypt] = new Array(19.5, 1, 0, 0, 17.5);
    this.methodParams[this.Tehran] = new Array(17.7, 0, 4.5, 0, 15);
    this.methodParams[this.Custom] = new Array(18, 1, 0, 0, 17);

}


//-------------------- Interface Functions --------------------


// return prayer times for a given date
PrayTime.prototype.getDatePrayerTimes = function(year, month, day, latitude, longitude, timeZone) {
    this.lat = latitude;
    this.lng = longitude;
    this.timeZone = this.effectiveTimeZone(year, month, day, timeZone);
    this.JDate = this.julianDate(year, month, day) - longitude / (15 * 24);
    return this.computeDayTimes();
}

// return prayer times for a given date
PrayTime.prototype.getPrayerTimes = function(date, latitude, longitude, timeZone) {
    return this.getDatePrayerTimes(date.getFullYear(), date.getMonth() + 1, date.getDate(),
				latitude, longitude, timeZone);
}

// set the calculation method 
PrayTime.prototype.setCalcMethod = function(methodID) {
    this.calcMethod = methodID;
}

// set the juristic method for Asr
PrayTime.prototype.setAsrMethod = function(methodID) {
    if (methodID < 0 || methodID > 1)
        return;
    this.asrJuristic = methodID;
}

// set the angle for calculating Fajr
PrayTime.prototype.setFajrAngle = function(angle) {
    this.setCustomParams(new Array(angle, null, null, null, null));
}

// set the angle for calculating Maghrib
PrayTime.prototype.setMaghribAngle = function(angle) {
    this.setCustomParams(new Array(null, 0, angle, null, null));
}

// set the angle for calculating Isha
PrayTime.prototype.setIshaAngle = function(angle) {
    this.setCustomParams(new Array(null, null, null, 0, angle));
}

// set the minutes after mid-day for calculating Dhuhr
PrayTime.prototype.setDhuhrMinutes = function(minutes) {
    this.dhuhrMinutes = minutes;
}

// set the minutes after Sunset for calculating Maghrib
PrayTime.prototype.setMaghribMinutes = function(minutes) {
    this.setCustomParams(new Array(null, 1, minutes, null, null));
}

// set the minutes after Maghrib for calculating Isha
PrayTime.prototype.setIshaMinutes = function(minutes) {
    this.setCustomParams(new Array(null, null, null, 1, minutes));
}

// set custom values for calculation parameters
PrayTime.prototype.setCustomParams = function(params) {
    for (var i = 0; i < 5; i++) {
        if (params[i] == null)
            this.methodParams[this.Custom][i] = this.methodParams[this.calcMethod][i];
        else
            this.methodParams[this.Custom][i] = params[i];
    }
    this.calcMethod = this.Custom;
}

// set adjusting method for higher latitudes 
PrayTime.prototype.setHighLatsMethod = function(methodID) {
    this.adjustHighLats = methodID;
}

// set the time format 
PrayTime.prototype.setTimeFormat = function(timeFormat) {
    this.timeFormat = timeFormat;
}

// convert float hours to 24h format
PrayTime.prototype.floatToTime24 = function(time) {
    if (isNaN(time))
        return this.InvalidTime;
    time = this.fixhour(time + 0.5 / 60);  // add 0.5 minutes to round
    var hours = Math.floor(time);
    var minutes = Math.floor((time - hours) * 60);
    return this.twoDigitsFormat(hours) + ':' + this.twoDigitsFormat(minutes);
}

// convert float hours to 12h format
PrayTime.prototype.floatToTime12 = function(time, noSuffix) {
    if (isNaN(time))
        return this.InvalidTime;
    time = this.fixhour(time + 0.5 / 60);  // add 0.5 minutes to round
    var hours = Math.floor(time);
    var minutes = Math.floor((time - hours) * 60);
    var suffix = hours >= 12 ? ' pm' : ' am';
    hours = (hours + 12 - 1) % 12 + 1;
    return hours + ':' + this.twoDigitsFormat(minutes) + (noSuffix ? '' : suffix);
}

// convert float hours to 12h format with no suffix
PrayTime.prototype.floatToTime12NS = function(time) {
    return this.floatToTime12(time, true);
}



//---------------------- Calculation Functions -----------------------

// References:
// http://www.ummah.net/astronomy/saltime  
// http://aa.usno.navy.mil/faq/docs/SunApprox.html


// compute declination angle of sun and equation of time
PrayTime.prototype.sunPosition = function(jd) {
    var D = jd - 2451545.0;
    var g = this.fixangle(357.529 + 0.98560028 * D);
    var q = this.fixangle(280.459 + 0.98564736 * D);
    var L = this.fixangle(q + 1.915 * this.dsin(g) + 0.020 * this.dsin(2 * g));

    var R = 1.00014 - 0.01671 * this.dcos(g) - 0.00014 * this.dcos(2 * g);
    var e = 23.439 - 0.00000036 * D;

    var d = this.darcsin(this.dsin(e) * this.dsin(L));
    var RA = this.darctan2(this.dcos(e) * this.dsin(L), this.dcos(L)) / 15;
    RA = this.fixhour(RA);
    var EqT = q / 15 - RA;

    return new Array(d, EqT);
}

// compute equation of time
PrayTime.prototype.equationOfTime = function(jd) {
    return this.sunPosition(jd)[1];
}

// compute declination angle of sun
PrayTime.prototype.sunDeclination = function(jd) {
    return this.sunPosition(jd)[0];
}

// compute mid-day (Dhuhr, Zawal) time
PrayTime.prototype.computeMidDay = function(t) {
    var T = this.equationOfTime(this.JDate + t);
    var Z = this.fixhour(12 - T);
    return Z;
}

// compute time for a given angle G
PrayTime.prototype.computeTime = function(G, t) {
    var D = this.sunDeclination(this.JDate + t);
    var Z = this.computeMidDay(t);
    var V = 1 / 15 * this.darccos((-this.dsin(G) - this.dsin(D) * this.dsin(this.lat)) /
			(this.dcos(D) * this.dcos(this.lat)));
    return Z + (G > 90 ? -V : V);
}

// compute the time of Asr
PrayTime.prototype.computeAsr = function(step, t)  // Shafii: step=1, Hanafi: step=2
{
    var D = this.sunDeclination(this.JDate + t);
    var G = -this.darccot(step + this.dtan(Math.abs(this.lat - D)));
    return this.computeTime(G, t);
}


//---------------------- Compute Prayer Times -----------------------


// compute prayer times at given julian date
PrayTime.prototype.computeTimes = function(times) {
    var t = this.dayPortion(times);

    var Fajr = this.computeTime(180 - this.methodParams[this.calcMethod][0], t[0]);
    var Sunrise = this.computeTime(180 - 0.833, t[1]);
    var Dhuhr = this.computeMidDay(t[2]);
    var Asr = this.computeAsr(1 + this.asrJuristic, t[3]);
    var Sunset = this.computeTime(0.833, t[4]); ;
    var Maghrib = this.computeTime(this.methodParams[this.calcMethod][2], t[5]);
    var Isha = this.computeTime(this.methodParams[this.calcMethod][4], t[6]);

    return new Array(Fajr, Sunrise, Dhuhr, Asr, Sunset, Maghrib, Isha);
}


// compute prayer times at given julian date
PrayTime.prototype.computeDayTimes = function() {

    for (var i = 1; i <= this.numIterations; i++)
        times = this.computeTimes(times);

    times = this.adjustTimes(times);
    return this.adjustTimesFormat(times);
}


// adjust times in a prayer time array
PrayTime.prototype.adjustTimes = function(times) {
    for (var i = 0; i < 7; i++)
        times[i] += this.timeZone - this.lng / 15;
    times[2] += this.dhuhrMinutes / 60; //Dhuhr
    if (this.methodParams[this.calcMethod][1] == 1) // Maghrib
        times[5] = times[4] + this.methodParams[this.calcMethod][2] / 60;
    if (this.methodParams[this.calcMethod][3] == 1) // Isha
        times[6] = times[5] + this.methodParams[this.calcMethod][4] / 60;

    if (this.adjustHighLats != this.None)
        times = this.adjustHighLatTimes(times);
    return times;
}


// convert times array to given time format
PrayTime.prototype.adjustTimesFormat = function(times) {
    if (this.timeFormat == this.Float)
        return times;
    for (var i = 0; i < 7; i++)
        if (this.timeFormat == this.Time12)
        times[i] = this.floatToTime12(times[i]);
    else if (this.timeFormat == this.Time12NS)
        times[i] = this.floatToTime12(times[i], true);
    else
        times[i] = this.floatToTime24(times[i]);
    return times;
}


// adjust Fajr, Isha and Maghrib for locations in higher latitudes
PrayTime.prototype.adjustHighLatTimes = function(times) {
    var nightTime = this.timeDiff(times[4], times[1]); // sunset to sunrise

    // Adjust Fajr
    var FajrDiff = this.nightPortion(this.methodParams[this.calcMethod][0]) * nightTime;
    if (isNaN(times[0]) || this.timeDiff(times[0], times[1]) > FajrDiff)
        times[0] = times[1] - FajrDiff;

    // Adjust Isha
    var IshaAngle = (this.methodParams[this.calcMethod][3] == 0) ? this.methodParams[this.calcMethod][4] : 18;
    var IshaDiff = this.nightPortion(IshaAngle) * nightTime;
    if (isNaN(times[6]) || this.timeDiff(times[4], times[6]) > IshaDiff)
        times[6] = times[4] + IshaDiff;

    // Adjust Maghrib
    var MaghribAngle = (this.methodParams[this.calcMethod][1] == 0) ? this.methodParams[this.calcMethod][2] : 4;
    var MaghribDiff = this.nightPortion(MaghribAngle) * nightTime;
    if (isNaN(times[5]) || this.timeDiff(times[4], times[5]) > MaghribDiff)
        times[5] = times[4] + MaghribDiff;

    return times;
}


// the night portion used for adjusting times in higher latitudes
PrayTime.prototype.nightPortion = function(angle) {
    if (this.adjustHighLats == this.AngleBased)
        return 1 / 60 * angle;
    if (this.adjustHighLats == this.MidNight)
        return 1 / 2;
    if (this.adjustHighLats == this.OneSeventh)
        return 1 / 7;
}


// convert hours to day portions 
PrayTime.prototype.dayPortion = function(times) {
    for (var i = 0; i < 7; i++)
        times[i] /= 24;
    return times;
}



//---------------------- Misc Functions -----------------------


// compute the difference between two times 
PrayTime.prototype.timeDiff = function(time1, time2) {
    return this.fixhour(time2 - time1);
}


// add a leading 0 if necessary
PrayTime.prototype.twoDigitsFormat = function(num) {
    return (num < 10) ? '0' + num : num;
}



//---------------------- Julian Date Functions -----------------------


// calculate julian date from a calendar date
PrayTime.prototype.julianDate = function(year, month, day) {
    if (month <= 2) {
        year -= 1;
        month += 12;
    }
    var A = Math.floor(year / 100);
    var B = 2 - A + Math.floor(A / 4);

    var JD = Math.floor(365.25 * (year + 4716)) + Math.floor(30.6001 * (month + 1)) + day + B - 1524.5;
    return JD;
}


// convert a calendar date to julian date (second method)
PrayTime.prototype.calcJD = function(year, month, day) {
    var J1970 = 2440588.0;
    var date = new Date(year, month - 1, day);
    var ms = date.getTime();   // # of milliseconds since midnight Jan 1, 1970
    var days = Math.floor(ms / (1000 * 60 * 60 * 24));
    return J1970 + days - 0.5;
}


//---------------------- Time-Zone Functions -----------------------


// compute local time-zone for a specific date
PrayTime.prototype.getTimeZone = function(date) {
    var localDate = new Date(date.getFullYear(), date.getMonth(), date.getDate(), 0, 0, 0, 0);
    var GMTString = localDate.toGMTString();
    var GMTDate = new Date(GMTString.substring(0, GMTString.lastIndexOf(' ') - 1));
    var hoursDiff = (localDate - GMTDate) / (1000 * 60 * 60);
    return hoursDiff;
}


// compute base time-zone of the system
PrayTime.prototype.getBaseTimeZone = function() {
    return this.getTimeZone(new Date(2000, 0, 15))
}


// detect daylight saving in a given date
PrayTime.prototype.detectDaylightSaving = function(date) {
    return this.getTimeZone(date) != this.getBaseTimeZone();
}


// return effective timezone for a given date
PrayTime.prototype.effectiveTimeZone = function(year, month, day, timeZone) {
    if (timeZone == null || typeof (timeZone) == 'undefined' || timeZone == 'auto')
        timeZone = this.getTimeZone(new Date(year, month - 1, day));
    return 1 * timeZone;
}


//---------------------- Trigonometric Functions -----------------------

// degree sin
PrayTime.prototype.dsin = function(d) {
    return Math.sin(this.dtr(d));
}

// degree cos
PrayTime.prototype.dcos = function(d) {
    return Math.cos(this.dtr(d));
}

// degree tan
PrayTime.prototype.dtan = function(d) {
    return Math.tan(this.dtr(d));
}

// degree arcsin
PrayTime.prototype.darcsin = function(x) {
    return this.rtd(Math.asin(x));
}

// degree arccos
PrayTime.prototype.darccos = function(x) {
    return this.rtd(Math.acos(x));
}

// degree arctan
PrayTime.prototype.darctan = function(x) {
    return this.rtd(Math.atan(x));
}

// degree arctan2
PrayTime.prototype.darctan2 = function(y, x) {
    return this.rtd(Math.atan2(y, x));
}

// degree arccot
PrayTime.prototype.darccot = function(x) {
    return this.rtd(Math.atan(1 / x));
}

// degree to radian
PrayTime.prototype.dtr = function(d) {
    return (d * Math.PI) / 180.0;
}

// radian to degree
PrayTime.prototype.rtd = function(r) {
    return (r * 180.0) / Math.PI;
}

// range reduce angle in degrees.
PrayTime.prototype.fixangle = function(a) {
    a = a - 360.0 * (Math.floor(a / 360.0));
    a = a < 0 ? a + 360.0 : a;
    return a;
}

// range reduce hours to 0..23
PrayTime.prototype.fixhour = function(a) {
    a = a - 24.0 * (Math.floor(a / 24.0));
    a = a < 0 ? a + 24.0 : a;
    return a;
}


//---------------------- prayTime Object -----------------------

var prayTime = new PrayTime();

//----------------------------------------------------------------

function querySt(ji) {
    hu = window.location.search.substring(1);
    gy = hu.split("&");
    for (i = 0; i < gy.length; i++) {
        ft = gy[i].split("=");
        if (ft[0] == ji) {
            return ft[1];
        }
    }
}

function showOgh(ok) {
    cityname = point[0];
    var date = ok;  //new Date(); // today
    prayTime.setCalcMethod(prayTime.Jafari);
    prayTime.setAsrMethod(prayTime.Shafii);
    prayTime.setFajrAngle(18);
    times = prayTime.getPrayerTimes(date, point[1], point[2], 'auto');
}