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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <i18nutil/calendar.hxx>
+#include <cmath>
+#include <stdlib.h>
+
+#include <calendar_hijri.hxx>
+#include <tools/long.hxx>
+#include <basegfx/numeric/ftools.hxx>
+
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::i18n;
+
+namespace i18npool {
+
+// Synodic Period (mean time between 2 successive new moon: 29d, 12 hr, 44min, 3sec
+constexpr double SynPeriod = 29.53058868;
+
+// Julian day on Jan 1, 1900
+constexpr double jd1900 = 2415020.75933;
+
+// Reference point: March 26, 2001 == 1422 Hijri == 1252 Synodial month from 1900
+constexpr sal_Int32 SynRef = 1252;
+constexpr sal_Int32 GregRef = 1422;
+
+Calendar_hijri::Calendar_hijri()
+{
+ cCalendar = "com.sun.star.i18n.Calendar_hijri";
+}
+
+#define FIELDS ((1 << CalendarFieldIndex::ERA) | (1 << CalendarFieldIndex::YEAR) | (1 << CalendarFieldIndex::MONTH) | (1 << CalendarFieldIndex::DAY_OF_MONTH))
+
+// map field value from hijri calendar to gregorian calendar
+void Calendar_hijri::mapToGregorian()
+{
+ if (!(fieldSet & FIELDS))
+ return;
+
+ sal_Int32 day = static_cast<sal_Int32>(fieldSetValue[CalendarFieldIndex::DAY_OF_MONTH]);
+ sal_Int32 month = static_cast<sal_Int32>(fieldSetValue[CalendarFieldIndex::MONTH]) + 1;
+ sal_Int32 year = static_cast<sal_Int32>(fieldSetValue[CalendarFieldIndex::YEAR]);
+ if (fieldSetValue[CalendarFieldIndex::ERA] == 0)
+ year *= -1;
+
+ ToGregorian(&day, &month, &year);
+
+ fieldSetValue[CalendarFieldIndex::ERA] = year <= 0 ? 0 : 1;
+ fieldSetValue[CalendarFieldIndex::MONTH] = sal::static_int_cast<sal_Int16>(month - 1);
+ fieldSetValue[CalendarFieldIndex::DAY_OF_MONTH] = static_cast<sal_Int16>(day);
+ fieldSetValue[CalendarFieldIndex::YEAR] = static_cast<sal_Int16>(abs(year));
+ fieldSet |= FIELDS;
+}
+
+// map field value from gregorian calendar to hijri calendar
+void Calendar_hijri::mapFromGregorian()
+{
+ sal_Int32 month, day, year;
+
+ day = static_cast<sal_Int32>(fieldValue[CalendarFieldIndex::DAY_OF_MONTH]);
+ month = static_cast<sal_Int32>(fieldValue[CalendarFieldIndex::MONTH]) + 1;
+ year = static_cast<sal_Int32>(fieldValue[CalendarFieldIndex::YEAR]);
+ if (fieldValue[CalendarFieldIndex::ERA] == 0)
+ year *= -1;
+
+ // Get Hijri date
+ getHijri(&day, &month, &year);
+
+ fieldValue[CalendarFieldIndex::DAY_OF_MONTH] = static_cast<sal_Int16>(day);
+ fieldValue[CalendarFieldIndex::MONTH] = sal::static_int_cast<sal_Int16>(month - 1);
+ fieldValue[CalendarFieldIndex::YEAR] = static_cast<sal_Int16>(abs(year));
+ fieldValue[CalendarFieldIndex::ERA] = static_cast<sal_Int16>(year) < 1 ? 0 : 1;
+}
+
+
+// This function returns the Julian date/time of the Nth new moon since
+// January 1900. The synodic month is passed as parameter.
+
+// Adapted from "Astronomical Formulae for Calculators" by
+// Jean Meeus, Third Edition, Willmann-Bell, 1985.
+
+double
+Calendar_hijri::NewMoon(sal_Int32 n)
+{
+ double jd, t, t2, t3, k, ma, sa, tf, xtra;
+ k = n;
+ t = k/1236.85; // Time in Julian centuries from 1900 January 0.5
+ t2 = t * t;
+ t3 = t2 * t;
+
+ // Mean time of phase
+ jd = jd1900
+ + SynPeriod * k
+ - 0.0001178 * t2
+ - 0.000000155 * t3
+ + 0.00033 * sin(basegfx::deg2rad(166.56 + 132.87 * t - 0.009173 * t2));
+
+ // Sun's mean anomaly in radian
+ sa = basegfx::deg2rad(359.2242
+ + 29.10535608 * k
+ - 0.0000333 * t2
+ - 0.00000347 * t3);
+
+ // Moon's mean anomaly
+ ma = basegfx::deg2rad(306.0253
+ + 385.81691806 * k
+ + 0.0107306 * t2
+ + 0.00001236 * t3);
+
+ // Moon's argument of latitude
+ tf = 2.0 * basegfx::deg2rad(21.2964
+ + 390.67050646 * k
+ - 0.0016528 * t2
+ - 0.00000239 * t3);
+
+ // should reduce to interval between 0 to 1.0 before calculating further
+ // Corrections for New Moon
+ xtra = (0.1734 - 0.000393 * t) * sin(sa)
+ + 0.0021 * sin(sa * 2)
+ - 0.4068 * sin(ma)
+ + 0.0161 * sin(2 * ma)
+ - 0.0004 * sin(3 * ma)
+ + 0.0104 * sin(tf)
+ - 0.0051 * sin(sa + ma)
+ - 0.0074 * sin(sa - ma)
+ + 0.0004 * sin(tf + sa)
+ - 0.0004 * sin(tf - sa)
+ - 0.0006 * sin(tf + ma)
+ + 0.0010 * sin(tf - ma)
+ + 0.0005 * sin(sa + 2 * ma);
+
+ // convert from Ephemeris Time (ET) to (approximate) Universal Time (UT)
+ jd += xtra - (0.41 + 1.2053 * t + 0.4992 * t2)/1440;
+
+ return jd;
+}
+
+// Get Hijri Date
+void
+Calendar_hijri::getHijri(sal_Int32 *day, sal_Int32 *month, sal_Int32 *year)
+{
+ double prevday;
+ sal_Int32 syndiff;
+ sal_Int32 newsyn;
+ double newjd;
+ sal_Int32 synmonth;
+
+ // Get Julian Day from Gregorian
+ sal_Int32 const julday = getJulianDay(*day, *month, *year);
+
+ // obtain approx. of how many Synodic months since the beginning of the year 1900
+ synmonth = static_cast<sal_Int32>(0.5 + (julday - jd1900)/SynPeriod);
+
+ newsyn = synmonth;
+ prevday = julday - 0.5;
+
+ do {
+ newjd = NewMoon(newsyn);
+
+ // Decrement syntonic months
+ newsyn--;
+ } while (newjd > prevday);
+ newsyn++;
+
+ // difference from reference point
+ syndiff = newsyn - SynRef;
+
+ // Round up the day
+ *day = static_cast<sal_Int32>(julday - newjd + 0.5);
+ *month = (syndiff % 12) + 1;
+
+ // currently not supported
+ //dayOfYear = (sal_Int32)(month * SynPeriod + day);
+ *year = GregRef + static_cast<sal_Int32>(syndiff / 12);
+
+ // If month negative, consider it previous year
+ if (syndiff != 0 && *month <= 0) {
+ *month += 12;
+ (*year)--;
+ }
+
+ // If Before Hijri subtract 1
+ if (*year <= 0) (*year)--;
+}
+
+void
+Calendar_hijri::ToGregorian(sal_Int32 *day, sal_Int32 *month, sal_Int32 *year)
+{
+ sal_Int32 nmonth;
+ double jday;
+
+ if ( *year < 0 ) (*year)++;
+
+ // Number of month from reference point
+ nmonth = *month + *year * 12 - (GregRef * 12 + 1);
+
+ // Add Synodic Reference point
+ nmonth += SynRef;
+
+ // Get Julian days add time too
+ jday = NewMoon(nmonth) + *day;
+
+ // Round-up
+ jday = std::trunc(jday + 0.5);
+
+ // Use algorithm from "Numerical Recipes in C"
+ getGregorianDay(static_cast<sal_Int32>(jday), day, month, year);
+
+ // Julian -> Gregorian only works for non-negative year
+ if ( *year <= 0 ) {
+ *day = -1;
+ *month = -1;
+ *year = -1;
+ }
+}
+
+/* this algorithm is taken from "Numerical Recipes in C", 2nd ed, pp 14-15. */
+/* this algorithm only valid for non-negative gregorian year */
+void
+Calendar_hijri::getGregorianDay(sal_Int32 lJulianDay, sal_Int32 *pnDay, sal_Int32 *pnMonth, sal_Int32 *pnYear)
+{
+ /* working variables */
+ tools::Long lFactorA, lFactorB, lFactorC, lFactorD, lFactorE;
+
+ constexpr sal_Int32 GREGORIAN_CROSSOVER = 2299161;
+
+ /* test whether to adjust for the Gregorian calendar crossover */
+ if (lJulianDay >= GREGORIAN_CROSSOVER) {
+ /* calculate a small adjustment */
+ tools::Long lAdjust = static_cast<tools::Long>((static_cast<float>(lJulianDay - 1867216) - 0.25) / 36524.25);
+
+ lFactorA = lJulianDay + 1 + lAdjust - static_cast<tools::Long>(0.25 * lAdjust);
+
+ } else {
+ /* no adjustment needed */
+ lFactorA = lJulianDay;
+ }
+
+ lFactorB = lFactorA + 1524;
+ lFactorC = static_cast<tools::Long>(6680.0 + (static_cast<float>(lFactorB - 2439870) - 122.1) / 365.25);
+ lFactorD = static_cast<tools::Long>(365 * lFactorC + (0.25 * lFactorC));
+ lFactorE = static_cast<tools::Long>((lFactorB - lFactorD) / i18nutil::monthDaysWithoutJanFeb);
+
+ /* now, pull out the day number */
+ *pnDay = lFactorB - lFactorD - static_cast<tools::Long>(i18nutil::monthDaysWithoutJanFeb * lFactorE);
+
+ /* ...and the month, adjusting it if necessary */
+ *pnMonth = lFactorE - 1;
+ if (*pnMonth > 12)
+ (*pnMonth) -= 12;
+
+ /* ...and similarly for the year */
+ *pnYear = lFactorC - 4715;
+ if (*pnMonth > 2)
+ (*pnYear)--;
+
+ // Negative year adjustments
+ if (*pnYear <= 0)
+ (*pnYear)--;
+}
+
+sal_Int32
+Calendar_hijri::getJulianDay(sal_Int32 day, sal_Int32 month, sal_Int32 year)
+{
+ double jy, jm;
+
+ if( year == 0 ) {
+ return -1;
+ }
+
+ if( year == 1582 && month == 10 && day > 4 && day < 15 ) {
+ return -1;
+ }
+
+ if( month > 2 ) {
+ jy = year;
+ jm = month + 1;
+ } else {
+ jy = year - 1;
+ jm = month + 13;
+ }
+
+ sal_Int32 intgr = static_cast<sal_Int32>(static_cast<sal_Int32>(365.25 * jy) + static_cast<sal_Int32>(i18nutil::monthDaysWithoutJanFeb * jm) + day + 1720995 );
+
+ //check for switch to Gregorian calendar
+ double const gregcal = 15 + 31 * ( 10 + 12 * 1582 );
+
+ if( day + 31 * (month + 12 * year) >= gregcal ) {
+ double ja;
+ ja = std::trunc(0.01 * jy);
+ intgr += static_cast<sal_Int32>(2 - ja + std::trunc(0.25 * ja));
+ }
+
+ return intgr;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */