/*************************************************************************
 *  Copyright (C) 2008 by Volker Lanz <vl@fidra.de>                      *
 *                                                                       *
 *  This program is free software; you can redistribute it and/or        *
 *  modify it under the terms of the GNU General Public License as       *
 *  published by the Free Software Foundation; either version 3 of       *
 *  the License, or (at your option) any later version.                  *
 *                                                                       *
 *  This program 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 General Public License for more details.                         *
 *                                                                       *
 *  You should have received a copy of the GNU General Public License    *
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.*
 *************************************************************************/

#include "core/device.h"

#include "core/partitiontable.h"
#include "core/smartstatus.h"

#include "util/capacity.h"

#include <KLocalizedString>

#include <QFile>
#include <QByteArray>

#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/fs.h>

#if !defined(BLKPBSZGET)
#define BLKPBSZGET _IO(0x12,123)/* get block physical sector size */
#endif

static qint32 getPhysicalSectorSize(const QString& device_node)
{
    /*
     * possible ways of getting the physical sector size for a drive:
     * - ioctl(BLKPBSZGET) -- supported with Linux 2.6.32 and later
     * - /sys/block/sda/queue/physical_block_size
     * - libblkid from util-linux-ng 2.17 or later
     * TODO: implement the blkid method
     */

#if defined(BLKPBSZGET)
    int phSectorSize = -1;
    int fd = open(device_node.toLocal8Bit().constData(), O_RDONLY);
    if (fd != -1) {
        if (ioctl(fd, BLKPBSZGET, &phSectorSize) >= 0) {
            close(fd);
            return phSectorSize;
        }

        close(fd);
    }
#endif

    QFile f(QStringLiteral("/sys/block/%1/queue/physical_block_size").arg(QString(device_node).remove(QStringLiteral("/dev/"))));

    if (f.open(QIODevice::ReadOnly)) {
        QByteArray a = f.readLine();
        return a.simplified().toInt();
    }

    return -1;
}

/** Constructs a Device with an empty PartitionTable.
    @param name the Device's name, usually some string defined by the manufacturer
    @param devicenode the Device's node, for example "/dev/sda"
    @param heads the number of heads in CHS notation
    @param numSectors the number of sectors in CHS notation
    @param cylinders the number of cylinders in CHS notation
    @param sectorSize the size of a sector in bytes
*/
Device::Device(const QString& name, const QString& devicenode, qint32 heads, qint32 numSectors, qint32 cylinders, qint64 sectorSize, const QString& iconname) :
    QObject(),
    m_Name(name.length() > 0 ? name : i18n("Unknown Device")),
    m_DeviceNode(devicenode),
    m_PartitionTable(nullptr),
    m_Heads(heads),
    m_SectorsPerTrack(numSectors),
    m_Cylinders(cylinders),
    m_LogicalSectorSize(sectorSize),
    m_PhysicalSectorSize(getPhysicalSectorSize(devicenode)),
    m_IconName(iconname.isEmpty() ? QStringLiteral("drive-harddisk") : iconname),
    m_SmartStatus(new SmartStatus(devicenode))
{
}

/** Destructs a Device. */
Device::~Device()
{
    delete m_PartitionTable;
}

bool Device::operator==(const Device& other) const
{
    return m_DeviceNode == other.m_DeviceNode;
}

bool Device::operator!=(const Device& other) const
{
    return !(other == *this);
}

QString Device::prettyName() const
{
    if ( name().isEmpty() )
        return deviceNode();
    else
        return i18nc("Device name – Capacity (device node)", "%1 – %2 (%3)", name(), Capacity::formatByteSize(capacity()), deviceNode());
}