/* -*- 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 "DateScaling.hxx"

#include <com/sun/star/chart/TimeUnit.hpp>

#include <rtl/math.hxx>

#include <cppuhelper/supportsservice.hxx>

#include <limits>

namespace

{

constexpr OUString lcl_aServiceName_DateScaling = u"com.sun.star.chart2.DateScaling"_ustr;

constexpr OUString lcl_aServiceName_InverseDateScaling

    = u"com.sun.star.chart2.InverseDateScaling"_ustr;

const double lcl_fNumberOfMonths = 12.0;//todo: this needs to be offered by basic tools Date class if it should be more generic

}

namespace chart

{

using namespace ::com::sun::star;

using namespace ::com::sun::star::chart2;

using ::com::sun::star::chart::TimeUnit::DAY;

using ::com::sun::star::chart::TimeUnit::MONTH;

using ::com::sun::star::chart::TimeUnit::YEAR;

DateScaling::DateScaling( const Date& rNullDate, sal_Int32 nTimeUnit, bool bShifted )

        : m_aNullDate( rNullDate )

        , m_nTimeUnit( nTimeUnit )

        , m_bShifted( bShifted )

{

}

DateScaling::~DateScaling()

{

}

double SAL_CALL DateScaling::doScaling( double value )

{

    double fResult(value);

    if( std::isnan( value ) || std::isinf( value ) )

        return std::numeric_limits<double>::quiet_NaN();

    switch( m_nTimeUnit )

    {

        case DAY:

            fResult = value;

            if(m_bShifted)

                fResult+=0.5;

            break;

        case YEAR:

        case MONTH:

        default:

        {

            Date aDate(m_aNullDate);

            aDate.AddDays(::rtl::math::approxFloor(value));

            fResult = aDate.GetYear();

            fResult *= lcl_fNumberOfMonths;//assuming equal count of months in each year

            fResult += aDate.GetMonth();

            double fDayOfMonth = aDate.GetDay();

            fDayOfMonth -= 1.0;

            double fDaysInMonth = aDate.GetDaysInMonth();

            fResult += fDayOfMonth/fDaysInMonth;

            if(m_bShifted)

            {

                if( m_nTimeUnit==YEAR )

                    fResult += 0.5*lcl_fNumberOfMonths;

                else

                    fResult += 0.5;

            }

            break;

        }

    }

    return fResult;

}

uno::Reference< XScaling > SAL_CALL DateScaling::getInverseScaling()

{

    return new InverseDateScaling( m_aNullDate, m_nTimeUnit, m_bShifted );

}

OUString SAL_CALL DateScaling::getServiceName()

{

    return lcl_aServiceName_DateScaling;

}

OUString SAL_CALL DateScaling::getImplementationName()

{

    return lcl_aServiceName_DateScaling;

}

sal_Bool SAL_CALL DateScaling::supportsService( const OUString& rServiceName )

{

    return cppu::supportsService(this, rServiceName);

}

css::uno::Sequence< OUString > SAL_CALL DateScaling::getSupportedServiceNames()

{

    return { lcl_aServiceName_DateScaling };

}

InverseDateScaling::InverseDateScaling( const Date& rNullDate, sal_Int32 nTimeUnit, bool bShifted )

        : m_aNullDate( rNullDate )

        , m_nTimeUnit( nTimeUnit )

        , m_bShifted( bShifted )

{

}

InverseDateScaling::~InverseDateScaling()

{

}

double SAL_CALL InverseDateScaling::doScaling( double value )

{

    double fResult(value);

    if( std::isnan( value ) || std::isinf( value ) )

        return std::numeric_limits<double>::quiet_NaN();

    else

    {

        switch( m_nTimeUnit )

        {

            case DAY:

                if(m_bShifted)

                    value -= 0.5;

                fResult = value;

                break;

            case YEAR:

            case MONTH:

            default:

                //Date aDate(m_aNullDate);

                if(m_bShifted)

                {

                    if( m_nTimeUnit==YEAR )

                        value -= 0.5*lcl_fNumberOfMonths;

                    else

                        value -= 0.5;

                }

                Date aDate( Date::EMPTY );

                double fYear = ::rtl::math::approxFloor(value/lcl_fNumberOfMonths);

                double fMonth = ::rtl::math::approxFloor(value-(fYear*lcl_fNumberOfMonths));

                if( fMonth==0.0 )

                {

                    fYear--;

                    fMonth=12.0;

                }

                aDate.SetYear( static_cast<sal_uInt16>(fYear) );

                aDate.SetMonth( static_cast<sal_uInt16>(fMonth) );

                aDate.SetDay( 1 );

                double fMonthCount = (fYear*lcl_fNumberOfMonths)+fMonth;

                double fDay = (value-fMonthCount)*aDate.GetDaysInMonth();

                fDay += 1.0;

                aDate.SetDay( static_cast<sal_uInt16>(::rtl::math::round(fDay)) );

                fResult = aDate - m_aNullDate;

                break;

        }

    }

    return fResult;

}

uno::Reference< XScaling > SAL_CALL InverseDateScaling::getInverseScaling()

{

    return new DateScaling( m_aNullDate, m_nTimeUnit, m_bShifted );

}

OUString SAL_CALL InverseDateScaling::getServiceName()

{

    return lcl_aServiceName_InverseDateScaling;

}

OUString SAL_CALL InverseDateScaling::getImplementationName()

{

    return lcl_aServiceName_InverseDateScaling;

}

sal_Bool SAL_CALL InverseDateScaling::supportsService( const OUString& rServiceName )

{

    return cppu::supportsService(this, rServiceName);

}

css::uno::Sequence< OUString > SAL_CALL InverseDateScaling::getSupportedServiceNames()

{

    return { lcl_aServiceName_InverseDateScaling };

}

} //namespace chart

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