/*
   This file is part of the KDE project

   Copyright (C) 2008 Tobias Koenig <tokoe@kde.org>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#include "discspaceutil.h"

#include <QtCore/QDirIterator>
#include <QtCore/QFileInfo>

#include <kdiskfreespaceinfo.h>
#include <kdebug.h>
#include <kde_file.h>

DiscSpaceUtil::DiscSpaceUtil( const QString &directory )
    : mDirectory( directory ),
      mFullSize( 0 )
{
    calculateFullSize();
}

qulonglong DiscSpaceUtil::sizeOfPath( const QString &path )
{
    QFileInfo info( path );
    if ( !info.exists() ) {
        return 0;
    }

    if ( info.isSymLink() ) {
        // QFileInfo::size does not return the actual size of a symlink. #253776
        KDE_struct_stat buff;
        return static_cast<qulonglong>(KDE::lstat(path, &buff) == 0 ? buff.st_size : 0);
    } else if ( info.isFile() ) {
        return info.size();
    } else if ( info.isDir() ) {
        QDirIterator it( path, QDirIterator::NoIteratorFlags );

        qulonglong sum = 0;
        while ( it.hasNext() ) {
            const QFileInfo info = it.next();

            if (info.fileName() != QLatin1String(".") && info.fileName() != QLatin1String(".."))
                sum += sizeOfPath( info.absoluteFilePath() );
        }

        return sum;
    } else {
        return 0;
    }
}

double DiscSpaceUtil::usage( qulonglong size ) const
{
    if ( mFullSize == 0 )
        return 0;

    return (((double)size*100)/(double)mFullSize);
}

qulonglong DiscSpaceUtil::size() const
{
    return mFullSize;
}

QString DiscSpaceUtil::mountPoint() const
{
    return mMountPoint;
}

void DiscSpaceUtil::calculateFullSize()
{
    KDiskFreeSpaceInfo info = KDiskFreeSpaceInfo::freeSpaceInfo( mDirectory );
    if ( info.isValid() ) {
        mFullSize = info.size();
        mMountPoint = info.mountPoint();
    }
}