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 *
 * 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.
 *
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 * it under the terms of the GNU Lesser General Public License version 3
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 *
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 * 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.
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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_xmloff.hxx"
#include <limits.h>
#include <tools/debug.hxx>
#include <tools/bigint.hxx>
#include <rtl/ustrbuf.hxx>
#include "xmlehelp.hxx"

#include <xmloff/xmltoken.hxx>

using ::rtl::OUString;
using ::rtl::OUStringBuffer;

using namespace ::xmloff::token;

void SvXMLExportHelper::AddLength( sal_Int32 nValue, MapUnit eValueUnit,
                                           OUStringBuffer& rOut,
                                   MapUnit eOutUnit )
{
    // the sign is processed seperatly
    if( nValue < 0 )
    {
        nValue = -nValue;
        rOut.append( sal_Unicode('-') );
    }
    
    // The new length is (nVal * nMul)/(nDiv*nFac*10)
    sal_Int32 nMul = 1000;
    sal_Int32 nDiv = 1;
    sal_Int32 nFac = 100;
    enum XMLTokenEnum eUnit = XML_TOKEN_INVALID;
    switch( eValueUnit )
    {
    case MAP_TWIP:
        switch( eOutUnit )
        {
        case MAP_100TH_MM:
        case MAP_10TH_MM:
            DBG_ASSERT( MAP_INCH == eOutUnit,
                        "output unit not supported for twip values" );
        case MAP_MM:
            // 0.01mm = 0.57twip (exactly)
            nMul = 25400;	// 25.4 * 1000
            nDiv = 1440;	// 72 * 20;
            nFac = 100;
            eUnit = XML_UNIT_MM;
            break;

        case MAP_CM:
            // 0.001cm = 0.57twip (exactly)
            nMul = 25400;	// 2.54 * 10000
            nDiv = 1440;	// 72 * 20;
            nFac = 1000;
            eUnit = XML_UNIT_CM;
            break;

        case MAP_POINT:
            // 0.01pt = 0.2twip (exactly)
            nMul = 1000;
            nDiv = 20;
            nFac = 100;
            eUnit = XML_UNIT_PT;
            break;

        case MAP_INCH:
        default:
            DBG_ASSERT( MAP_INCH == eOutUnit,
                        "output unit not supported for twip values" );
            // 0.0001in = 0.144twip (exactly)
            nMul = 100000;
            nDiv = 1440;	// 72 * 20;
            nFac = 10000;
            eUnit = XML_UNIT_INCH;
            break;
        }
        break;

    case MAP_POINT:
        // 1pt = 1pt (exactly)
        DBG_ASSERT( MAP_POINT == eOutUnit,
                    "output unit not supported for pt values" );
        nMul = 10;
        nDiv = 1;
        nFac = 1;
        eUnit = XML_UNIT_PT;
        break;
    case MAP_10TH_MM:
    case MAP_100TH_MM:
        {
            long nFac2 = (MAP_100TH_MM == eValueUnit) ? 100 : 10;
            switch( eOutUnit )
            {
            case MAP_100TH_MM:
            case MAP_10TH_MM:
                DBG_ASSERT( MAP_INCH == eOutUnit,
                            "output unit not supported for 1/100mm values" );
            case MAP_MM:
                // 0.01mm = 1 mm/100 (exactly)
                nMul = 10;	
                nDiv = 1;	
                nFac = nFac2;
                eUnit = XML_UNIT_MM;
                break;

            case MAP_CM:
                // 0.001mm = 1 mm/100 (exactly)
                nMul = 10;
                nDiv = 1;	// 72 * 20;
                nFac = 10*nFac2;
                eUnit = XML_UNIT_CM;
                break;

            case MAP_POINT:
                // 0.01pt = 0.35 mm/100 (exactly)
                nMul = 72000;
                nDiv = 2540;
                nFac = nFac2;
                eUnit = XML_UNIT_PT;
                break;

            case MAP_INCH:
            default:
                DBG_ASSERT( MAP_INCH == eOutUnit,
                            "output unit not supported for 1/100mm values" );
                // 0.0001in = 0.254 mm/100 (exactly)
                nMul = 100000;
                nDiv = 2540;
                nFac = 100*nFac2;
                eUnit = XML_UNIT_INCH;
                break;
            }
            break;
        }
        default:
            DBG_ASSERT( 0, "input unit not handled" );
            break;
    }


    sal_Int32 nLongVal = 0;
    BOOL bOutLongVal = TRUE;
    if( nValue > SAL_MAX_INT32 / nMul )
    {
        // A big int is required for calculation
        BigInt nBigVal( nValue );
        nBigVal *= nMul;
        nBigVal /= nDiv;
        nBigVal += 5;
        nBigVal /= 10;

        if( nBigVal.IsLong() )
        {
            // To convert the value into a string a sal_Int32 is sufficient
            nLongVal = sal_Int32( nBigVal );
        }
        else
        {
            BigInt nBigFac( nFac );
            BigInt nBig10( 10 );
            rOut.append( (sal_Int32)(nBigVal / nBigFac) );
            if( !(nBigVal % nBigFac).IsZero() )
            {
                rOut.append( sal_Unicode('.') );
                while( nFac > 1 && !(nBigVal % nBigFac).IsZero() )
                {
                    nFac /= 10;
                    nBigFac = nFac;
                    rOut.append( (sal_Int32)((nBigVal / nBigFac) % nBig10 ) );
                }
            }
            bOutLongVal = FALSE;
        }
    }
    else
    {
        nLongVal = nValue * nMul;
        nLongVal /= nDiv;
        nLongVal += 5;
        nLongVal /= 10;
    }

    if( bOutLongVal )
    {
        rOut.append( (sal_Int32)(nLongVal / nFac) );
        if( nFac > 1 && (nLongVal % nFac) != 0 )
        {
            rOut.append( sal_Unicode('.') );
            while( nFac > 1 && (nLongVal % nFac) != 0 )
            {
                nFac /= 10;
                rOut.append( (sal_Int32)((nLongVal / nFac) % 10) );
            }
        }
    }

    if( eUnit != XML_TOKEN_INVALID )
        rOut.append( GetXMLToken(eUnit) );
}

void SvXMLExportHelper::AddPercentage( sal_Int32 nValue, OUStringBuffer& rOut )
{
    rOut.append( nValue );
    rOut.append( sal_Unicode('%' ) );
}

double SvXMLExportHelper::GetConversionFactor(::rtl::OUStringBuffer& rUnit, 
    const MapUnit eCoreUnit, const MapUnit eDestUnit)
{
    double fRetval(1.0);
    rUnit.setLength(0L);

    if(eCoreUnit != eDestUnit)
    {
        enum XMLTokenEnum eUnit = XML_TOKEN_INVALID;

        switch(eCoreUnit)
        {
            case MAP_TWIP:
            {
                switch(eDestUnit)
                {
                    case MAP_100TH_MM:
                    case MAP_10TH_MM:
                    {
                        DBG_ASSERT(MAP_INCH == eDestUnit, "output unit not supported for twip values");
                    }
                    case MAP_MM:
                    {
                        // 0.01mm = 0.57twip (exactly)
                        fRetval = ((25400.0 / 1440.0) / 1000.0);
                        eUnit = XML_UNIT_MM;
                        break;
                    }
                    case MAP_CM:
                    {
                        // 0.001cm = 0.57twip (exactly)
                        fRetval = ((25400.0 / 1440.0) / 10000.0);
                        eUnit = XML_UNIT_CM;
                        break;
                    }
                    case MAP_POINT:
                    {
                        // 0.01pt = 0.2twip (exactly)
                        fRetval = ((1000.0 / 20.0) / 1000.0);
                        eUnit = XML_UNIT_PT;
                        break;
                    }
                    case MAP_INCH:
                    default:
                    {
                        DBG_ASSERT(MAP_INCH == eDestUnit, "output unit not supported for twip values");
                        // 0.0001in = 0.144twip (exactly)
                        fRetval = ((100000.0 / 1440.0) / 100000.0);
                        eUnit = XML_UNIT_INCH;
                        break;
                    }
                }
                break;
            }
            case MAP_POINT:
            {
                switch(eDestUnit)
                {
                    case MAP_MM:
                        // 1mm = 72 / 25.4 pt (exactly)
                        fRetval = ( 25.4 / 72.0 );
                        eUnit = XML_UNIT_MM;
                        break;
                        
                    case MAP_CM:
                        // 1cm = 72 / 2.54 pt (exactly)
                        fRetval = ( 2.54 / 72.0 );
                        eUnit = XML_UNIT_CM;
                        break;

                    case MAP_TWIP:
                        // 1twip = 72 / 1440 pt (exactly)
                        fRetval = 20.0;     // 1440.0 / 72.0
                        eUnit = XML_UNIT_PC;
                        break;

                    case MAP_INCH:
                    default:
                        DBG_ASSERT(MAP_INCH == eDestUnit, "output unit not supported for pt values");
                        // 1in = 72 pt (exactly)
                        fRetval = ( 1.0 / 72.0 );
                        eUnit = XML_UNIT_INCH;
                        break;
                }
                break;
            }
            case MAP_10TH_MM:
            {
                switch(eDestUnit)
                {
                    case MAP_100TH_MM:
                    case MAP_10TH_MM:
                    {
                        DBG_ASSERT(MAP_INCH == eDestUnit, "output unit not supported for 1/100mm values");
                    }
                    case MAP_MM:
                    {
                        // 0.01mm = 1 mm/100 (exactly)
                        fRetval = ((10.0 / 1.0) / 100.0);
                        eUnit = XML_UNIT_MM;
                        break;
                    }
                    case MAP_CM:
                    {
                        // 0.001mm = 1 mm/100 (exactly)
                        fRetval = ((10.0 / 1.0) / 1000.0);
                        eUnit = XML_UNIT_CM;
                        break;
                    }
                    case MAP_POINT:
                    {
                        // 0.01pt = 0.35 mm/100 (exactly)
                        fRetval = ((72000.0 / 2540.0) / 100.0);
                        eUnit = XML_UNIT_PT;
                        break;
                    }
                    case MAP_INCH:
                    default:
                    {
                        DBG_ASSERT(MAP_INCH == eDestUnit, "output unit not supported for 1/100mm values");
                        // 0.0001in = 0.254 mm/100 (exactly)
                        fRetval = ((100000.0 / 2540.0) / 10000.0);
                        eUnit = XML_UNIT_INCH;
                        break;
                    }
                }
                break;
            }
            case MAP_100TH_MM:
            {
                switch(eDestUnit)
                {
                    case MAP_100TH_MM:
                    case MAP_10TH_MM:
                    {
                        DBG_ASSERT(MAP_INCH == eDestUnit, "output unit not supported for 1/100mm values");
                    }
                    case MAP_MM:
                    {
                        // 0.01mm = 1 mm/100 (exactly)
                        fRetval = ((10.0 / 1.0) / 1000.0);
                        eUnit = XML_UNIT_MM;
                        break;
                    }
                    case MAP_CM:
                    {
                        // 0.001mm = 1 mm/100 (exactly)
                        fRetval = ((10.0 / 1.0) / 10000.0);
                        eUnit = XML_UNIT_CM;
                        break;
                    }
                    case MAP_POINT:
                    {
                        // 0.01pt = 0.35 mm/100 (exactly)
                        fRetval = ((72000.0 / 2540.0) / 1000.0);
                        eUnit = XML_UNIT_PT;
                        break;
                    }
                    case MAP_INCH:
                    default:
                    {
                        DBG_ASSERT(MAP_INCH == eDestUnit, "output unit not supported for 1/100mm values");
                        // 0.0001in = 0.254 mm/100 (exactly)
                        fRetval = ((100000.0 / 2540.0) / 100000.0);
                        eUnit = XML_UNIT_INCH;
                        break;
                    }
                }
                break;
            }
            default:
                DBG_ERROR("xmloff::SvXMLExportHelper::GetConversionFactor(), illegal eCoreUnit value!");
                break;
        }

        if(eUnit != XML_TOKEN_INVALID)
            rUnit.append(GetXMLToken(eUnit));
    }

    return fRetval;
}

MapUnit SvXMLExportHelper::GetUnitFromString(const ::rtl::OUString& rString, MapUnit eDefaultUnit)
{
    sal_Int32 nPos = 0L;
    sal_Int32 nLen = rString.getLength();
    MapUnit eRetUnit = eDefaultUnit;

    // skip white space
    while( nPos < nLen && sal_Unicode(' ') == rString[nPos] )
        nPos++;

    // skip negative
    if( nPos < nLen && sal_Unicode('-') == rString[nPos] )
        nPos++;

    // skip number
    while( nPos < nLen && sal_Unicode('0') <= rString[nPos] && sal_Unicode('9') >= rString[nPos] )
        nPos++;

    if( nPos < nLen && sal_Unicode('.') == rString[nPos] )
    {
        nPos++;
        while( nPos < nLen && sal_Unicode('0') <= rString[nPos] && sal_Unicode('9') >= rString[nPos] )
            nPos++;
    }

    // skip white space
    while( nPos < nLen && sal_Unicode(' ') == rString[nPos] )
        nPos++;

    if( nPos < nLen )
    {
        switch(rString[nPos])
        {
            case sal_Unicode('%') :
            {
                eRetUnit = MAP_RELATIVE;
                break;
            }
            case sal_Unicode('c'):
            case sal_Unicode('C'):
            {
                if(nPos+1 < nLen && (rString[nPos+1] == sal_Unicode('m') 
                    || rString[nPos+1] == sal_Unicode('M')))
                    eRetUnit = MAP_CM;
                break;
            }
            case sal_Unicode('e'):
            case sal_Unicode('E'):
            {
                // CSS1_EMS or CSS1_EMX later
                break;
            }
            case sal_Unicode('i'):
            case sal_Unicode('I'):
            {
                if(nPos+1 < nLen && (rString[nPos+1] == sal_Unicode('n') 
                    || rString[nPos+1] == sal_Unicode('n')))
                    eRetUnit = MAP_INCH;
                break;
            }
            case sal_Unicode('m'):
            case sal_Unicode('M'):
            {
                if(nPos+1 < nLen && (rString[nPos+1] == sal_Unicode('m') 
                    || rString[nPos+1] == sal_Unicode('M')))
                    eRetUnit = MAP_MM;
                break;
            }
            case sal_Unicode('p'):
            case sal_Unicode('P'):
            {
                if(nPos+1 < nLen && (rString[nPos+1] == sal_Unicode('t') 
                    || rString[nPos+1] == sal_Unicode('T')))
                    eRetUnit = MAP_POINT;
                if(nPos+1 < nLen && (rString[nPos+1] == sal_Unicode('c') 
                    || rString[nPos+1] == sal_Unicode('C')))
                    eRetUnit = MAP_TWIP;
                break;
            }
        }
    }

    return eRetUnit;
}