/* -*- 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 <osl/file.h>

#include <rtl/ustring.h>

#include <cassert>

static sal_uInt32 osl_defCalcTextWidth( rtl_uString *ustrText )

{

    return ustrText ? ustrText->length : 0;

}

oslFileError SAL_CALL osl_abbreviateSystemPath( rtl_uString *ustrSystemPath, rtl_uString **pustrCompacted, sal_uInt32 uMaxWidth, oslCalcTextWidthFunc pfnCalcWidth )

{

    rtl_uString     *ustrPath = nullptr;

    rtl_uString     *ustrFile = nullptr;

    sal_uInt32      uPathWidth, uFileWidth;

    if ( !pfnCalcWidth )

        pfnCalcWidth = osl_defCalcTextWidth;

    {

        sal_Int32   iLastSlash = rtl_ustr_lastIndexOfChar_WithLength( ustrSystemPath->buffer, ustrSystemPath->length, SAL_PATHDELIMITER );

        if ( iLastSlash >= 0 )

        {

            rtl_uString_newFromStr_WithLength( &ustrPath, ustrSystemPath->buffer, iLastSlash );

            rtl_uString_newFromStr_WithLength( &ustrFile, &ustrSystemPath->buffer[iLastSlash], ustrSystemPath->length - iLastSlash );

        }

        else

        {

            rtl_uString_new( &ustrPath );

            rtl_uString_newFromString( &ustrFile, ustrSystemPath );

        }

    }

    assert(ustrPath && ustrFile);

    uPathWidth = pfnCalcWidth( ustrPath );

    uFileWidth = pfnCalcWidth( ustrFile );

    /* First abbreviate the directory component of the path */

    while ( uPathWidth + uFileWidth > uMaxWidth )

    {

        if ( ustrPath->length > 3 )

        {

            ustrPath->length--;

            ustrPath->buffer[ustrPath->length-3] = '.';

            ustrPath->buffer[ustrPath->length-2] = '.';

            ustrPath->buffer[ustrPath->length-1] = '.';

            ustrPath->buffer[ustrPath->length] = 0;

            uPathWidth = pfnCalcWidth( ustrPath );

        }

        else

            break;

    }

    /* Now abbreviate file component */

    while ( uPathWidth + uFileWidth > uMaxWidth )

    {

        if ( ustrFile->length > 4 )

        {

            ustrFile->length--;

            ustrFile->buffer[ustrFile->length-3] = '.';

            ustrFile->buffer[ustrFile->length-2] = '.';

            ustrFile->buffer[ustrFile->length-1] = '.';

            ustrFile->buffer[ustrFile->length] = 0;

            uFileWidth = pfnCalcWidth( ustrFile );

        }

        else

            break;

    }

    rtl_uString_newConcat( pustrCompacted, ustrPath, ustrFile );

    /* Event now if path was compacted to ".../..." it can be too large */

    uPathWidth += uFileWidth;

    while ( uPathWidth > uMaxWidth )

    {

        (*pustrCompacted)->length--;

        (*pustrCompacted)->buffer[(*pustrCompacted)->length] = 0;

        uPathWidth = pfnCalcWidth( *pustrCompacted );

    }

    rtl_uString_release(ustrPath);

    rtl_uString_release(ustrFile);

    return osl_File_E_None;

}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */