// © 2016 and later: Unicode, Inc. and others.

// License & terms of use: http://www.unicode.org/copyright.html

/*

 *******************************************************************************

 * Copyright (C) 2003-2013, International Business Machines Corporation and

 * others. All Rights Reserved.

 *******************************************************************************

 *

 * File TAIWNCAL.CPP

 *

 * Modification History:

 *  05/13/2003    srl     copied from gregocal.cpp

 *  06/29/2007    srl     copied from buddhcal.cpp

 *  05/12/2008    jce     modified to use calendar=roc per CLDR

 *

 */

#include "unicode/utypes.h"

#if !UCONFIG_NO_FORMATTING

#include "taiwncal.h"

#include "gregoimp.h"

#include "unicode/gregocal.h"

#include "umutex.h"

#include <float.h>

U_NAMESPACE_BEGIN

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TaiwanCalendar)

static const int32_t kTaiwanEraStart = 1911;  // 1911 (Gregorian)

static const int32_t kGregorianEpoch = 1970;

TaiwanCalendar::TaiwanCalendar(const Locale& aLocale, UErrorCode& success)

:   GregorianCalendar(aLocale, success)

{

}

TaiwanCalendar::~TaiwanCalendar()

{

}

TaiwanCalendar::TaiwanCalendar(const TaiwanCalendar& source)

: GregorianCalendar(source)

{

}

TaiwanCalendar* TaiwanCalendar::clone() const

{

    return new TaiwanCalendar(*this);

}

const char *TaiwanCalendar::getType() const

{

    return "roc";

}

int32_t TaiwanCalendar::handleGetExtendedYear(UErrorCode& status)

{

    if (U_FAILURE(status)) {

        return 0;

    }

    // EXTENDED_YEAR in TaiwanCalendar is a Gregorian year

    // The default value of EXTENDED_YEAR is 1970 (Minguo 59)

    if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR

        && newerField(UCAL_EXTENDED_YEAR, UCAL_ERA) == UCAL_EXTENDED_YEAR) {

        return internalGet(UCAL_EXTENDED_YEAR, kGregorianEpoch);

    }

    int32_t era = internalGet(UCAL_ERA, MINGUO);

    int32_t year = internalGet(UCAL_YEAR, 1);

    switch (era) {

        case MINGUO:

            if (uprv_add32_overflow(year, kTaiwanEraStart, &year)) {

                status = U_ILLEGAL_ARGUMENT_ERROR;

                return 0;

            }

            return year;

        case BEFORE_MINGUO:

            if (uprv_add32_overflow(1 + kTaiwanEraStart, -year, &year)) {

                status = U_ILLEGAL_ARGUMENT_ERROR;

                return 0;

            }

            return year;

        default:

            status = U_ILLEGAL_ARGUMENT_ERROR;

            return 0;

    }

}

void TaiwanCalendar::handleComputeFields(int32_t julianDay, UErrorCode& status)

{

    GregorianCalendar::handleComputeFields(julianDay, status);

    int32_t y = internalGet(UCAL_EXTENDED_YEAR) - kTaiwanEraStart;

    if(y>0) {

        internalSet(UCAL_ERA, MINGUO);

        internalSet(UCAL_YEAR, y);

    } else {

        internalSet(UCAL_ERA, BEFORE_MINGUO);

        internalSet(UCAL_YEAR, 1-y);

    }

}

int32_t TaiwanCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const

{

    if(field != UCAL_ERA) {

        return GregorianCalendar::handleGetLimit(field,limitType);

    }

    if (limitType == UCAL_LIMIT_MINIMUM || limitType == UCAL_LIMIT_GREATEST_MINIMUM) {

        return BEFORE_MINGUO;

    }

    return MINGUO;

}

IMPL_SYSTEM_DEFAULT_CENTURY(TaiwanCalendar, "@calendar=roc")

U_NAMESPACE_END

#endif