/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
 * Copyright 2000, 2010 Oracle and/or its affiliates.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/

// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_tools.hxx"

#include <tools/datetime.hxx>
#include <rtl/math.hxx>

/*************************************************************************
|*
|*    DateTime::IsBetween()
|*
*************************************************************************/

sal_Bool DateTime::IsBetween( const DateTime& rFrom,
                          const DateTime& rTo ) const
{
    if ( (*this >= rFrom) && (*this <= rTo) )
        return sal_True;
    else
        return sal_False;
}

/*************************************************************************
|*
|*    DateTime::operator >()
|*
*************************************************************************/

sal_Bool DateTime::operator >( const DateTime& rDateTime ) const
{
    if ( (Date::operator>( rDateTime )) ||
         (Date::operator==( rDateTime ) && Time::operator>( rDateTime )) )
        return sal_True;
    else
        return sal_False;
}

/*************************************************************************
|*
|*    DateTime::operator <()
|*
*************************************************************************/

sal_Bool DateTime::operator <( const DateTime& rDateTime ) const
{
    if ( (Date::operator<( rDateTime )) ||
         (Date::operator==( rDateTime ) && Time::operator<( rDateTime )) )
        return sal_True;
    else
        return sal_False;
}

/*************************************************************************
|*
|*    DateTime::operator >=()
|*
*************************************************************************/

sal_Bool DateTime::operator >=( const DateTime& rDateTime ) const
{
    if ( (Date::operator>( rDateTime )) ||
         (Date::operator==( rDateTime ) && Time::operator>=( rDateTime )) )
        return sal_True;
    else
        return sal_False;
}

/*************************************************************************
|*
|*    DateTime::operator <=()
|*
*************************************************************************/

sal_Bool DateTime::operator <=( const DateTime& rDateTime ) const
{
    if ( (Date::operator<( rDateTime )) ||
         (Date::operator==( rDateTime ) && Time::operator<=( rDateTime )) )
        return sal_True;
    else
        return sal_False;
}

/*************************************************************************
|*
|*    DateTime::GetSecFromDateTime()
|*
*************************************************************************/

long DateTime::GetSecFromDateTime( const Date& rDate ) const
{
    if ( Date::operator<( rDate ) )
        return 0;
    else
    {
        long nSec = Date( *this ) - rDate;
        nSec *= 24UL*60*60;
        long nHour = GetHour();
        long nMin  = GetMin();
        nSec += (nHour*3600)+(nMin*60)+GetSec();
        return nSec;
    }
}

/*************************************************************************
|*
|*    DateTime::GetSecFromDateTime()
|*
*************************************************************************/

void DateTime::MakeDateTimeFromSec( const Date& rDate, sal_uIntPtr nSec )
{
    long nDays = nSec / (24UL*60*60);
    ((Date*)this)->operator=( rDate );
    nSec -= nDays * (24UL*60*60);
    sal_uInt16 nMin = (sal_uInt16)(nSec / 60);
    nSec -= nMin * 60;
    ((Time*)this)->operator=( Time( 0, nMin, (sal_uInt16)nSec ) );
    operator+=( nDays );
}

/*************************************************************************
|*
|*    DateTime::operator +=()
|*
*************************************************************************/

DateTime& DateTime::operator +=( const Time& rTime )
{
    Time aTime = *this;
    aTime += rTime;
    sal_uInt16 nHours = aTime.GetHour();
    if ( aTime.GetTime() > 0 )
    {
        while ( nHours >= 24 )
        {
            Date::operator++();
            nHours -= 24;
        }
        aTime.SetHour( nHours );
    }
    else if ( aTime.GetTime() != 0 )
    {
        while ( nHours >= 24 )
        {
            Date::operator--();
            nHours -= 24;
        }
        Date::operator--();
        aTime = Time( 24, 0, 0 )+aTime;
    }
    Time::operator=( aTime );

    return *this;
}

/*************************************************************************
|*
|*    DateTime::operator -=()
|*
*************************************************************************/

DateTime& DateTime::operator -=( const Time& rTime )
{
    Time aTime = *this;
    aTime -= rTime;
    sal_uInt16 nHours = aTime.GetHour();
    if ( aTime.GetTime() > 0 )
    {
        while ( nHours >= 24 )
        {
            Date::operator++();
            nHours -= 24;
        }
        aTime.SetHour( nHours );
    }
    else if ( aTime.GetTime() != 0 )
    {
        while ( nHours >= 24 )
        {
            Date::operator--();
            nHours -= 24;
        }
        Date::operator--();
        aTime = Time( 24, 0, 0 )+aTime;
    }
    Time::operator=( aTime );

    return *this;
}

/*************************************************************************
|*
|*    DateTime::operator+()
|*
*************************************************************************/

DateTime operator +( const DateTime& rDateTime, long nDays )
{
    DateTime aDateTime( rDateTime );
    aDateTime += nDays;
    return aDateTime;
}

/*************************************************************************
|*
|*    DateTime::operator-()
|*
*************************************************************************/

DateTime operator -( const DateTime& rDateTime, long nDays )
{
    DateTime aDateTime( rDateTime );
    aDateTime -= nDays;
    return aDateTime;
}

/*************************************************************************
|*
|*    DateTime::operator+()
|*
*************************************************************************/

DateTime operator +( const DateTime& rDateTime, const Time& rTime )
{
    DateTime aDateTime( rDateTime );
    aDateTime += rTime;
    return aDateTime;
}

/*************************************************************************
|*
|*    DateTime::operator-()
|*
*************************************************************************/

DateTime operator -( const DateTime& rDateTime, const Time& rTime )
{
    DateTime aDateTime( rDateTime );
    aDateTime -= rTime;
    return aDateTime;
}

/*************************************************************************
|*
|*    DateTime::operator +=( double )
|*
*************************************************************************/

DateTime& DateTime::operator +=( double fTimeInDays )
{
    double fInt, fFrac;
    if ( fTimeInDays < 0.0 )
    {
        fInt = ::rtl::math::approxCeil( fTimeInDays );
        fFrac = fInt <= fTimeInDays ? 0.0 : fTimeInDays - fInt;
    }
    else
    {
        fInt = ::rtl::math::approxFloor( fTimeInDays );
        fFrac = fInt >= fTimeInDays ? 0.0 : fTimeInDays - fInt;
    }
    Date::operator+=( long(fInt) );		// full days
    if ( fFrac )
    {
        Time aTime(0);	// default ctor calls system time, we don't need that
        fFrac *= 24UL * 60 * 60 * 1000;		// time expressed in milliseconds
        aTime.MakeTimeFromMS( long(fFrac) );	// method handles negative ms
        operator+=( aTime );
    }
    return *this;
}

/*************************************************************************
|*
|*    DateTime::operator +( double )
|*
*************************************************************************/

DateTime operator +( const DateTime& rDateTime, double fTimeInDays )
{
    DateTime aDateTime( rDateTime );
    aDateTime += fTimeInDays;
    return aDateTime;
}

/*************************************************************************
|*
|*    DateTime::operator -()
|*
*************************************************************************/

double operator -( const DateTime& rDateTime1, const DateTime& rDateTime2 )
{
    long nDays = (const Date&) rDateTime1 - (const Date&) rDateTime2;
    long nTime = rDateTime1.GetMSFromTime() - rDateTime2.GetMSFromTime();
    if ( nTime )
    {
        double fTime = double(nTime);
        fTime /= 24UL * 60 * 60 * 1000;	// convert from milliseconds to fraction
        if ( nDays < 0 && fTime > 0.0 )
            fTime = 1.0 - fTime;
        return double(nDays) + fTime;
    }
    return double(nDays);
}

void DateTime::GetWin32FileDateTime( sal_uInt32 & rLower, sal_uInt32 & rUpper )
{
    const sal_Int64 a100nPerSecond = SAL_CONST_INT64( 10000000 );
    const sal_Int64 a100nPerDay = a100nPerSecond * sal_Int64( 60 * 60 * 24 );

    sal_Int64 nYears = GetYear() - 1601;
    sal_Int64 nDays =
        nYears * 365 +
        nYears / 4 - nYears / 100 + nYears / 400 +
        GetDayOfYear() - 1;

    sal_Int64 aTime =
        a100nPerDay * nDays +
        a100nPerSecond * (
                sal_Int64( GetSec() ) +
                60 * sal_Int64( GetMin() ) +
                60 * 60 * sal_Int64( GetHour() ) );

    rLower = sal_uInt32( aTime % SAL_CONST_UINT64( 0x100000000 ) );
    rUpper = sal_uInt32( aTime / SAL_CONST_UINT64( 0x100000000 ) );
}

DateTime DateTime::CreateFromWin32FileDateTime( const sal_uInt32 & rLower, const sal_uInt32 & rUpper )
{
    const sal_Int64 a100nPerSecond = SAL_CONST_INT64( 10000000 );
    const sal_Int64 a100nPerDay = a100nPerSecond * sal_Int64( 60 * 60 * 24 );

    sal_Int64 aTime = sal_Int64(
            sal_uInt64( rUpper ) * SAL_CONST_UINT64( 0x100000000 ) +
            sal_uInt64( rLower ) );

    sal_Int64 nDays = aTime / a100nPerDay;
    sal_Int64 nYears =
        ( nDays -
          ( nDays / ( 4 * 365 ) ) +
          ( nDays / ( 100 * 365 ) ) -
          ( nDays / ( 400 * 365 ) ) ) / 365;
    nDays -= nYears * 365 + nYears / 4 - nYears / 100 + nYears / 400;

    sal_uInt16 nMonths = 0;
    for( sal_Int64 nDaysCount = nDays; nDaysCount >= 0; )
    {
        nDays = nDaysCount;
        nMonths ++;
        nDaysCount -= Date(
            1, nMonths, sal::static_int_cast< sal_uInt16 >(1601 + nYears) ).
            GetDaysInMonth();
    }

    Date _aDate(
        (sal_uInt16)( nDays + 1 ), nMonths,
        sal::static_int_cast< sal_uInt16 >(nYears + 1601) );
    Time _aTime( sal_uIntPtr( ( aTime / ( a100nPerSecond * 60 * 60 ) ) % sal_Int64( 24 ) ),
            sal_uIntPtr( ( aTime / ( a100nPerSecond * 60 ) ) % sal_Int64( 60 ) ),
            sal_uIntPtr( ( aTime / ( a100nPerSecond ) ) % sal_Int64( 60 ) ) );

    return DateTime( _aDate, _aTime );
}

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