/*
    SPDX-FileCopyrightText: 2008-2010 Volker Lanz <vl@fidra.de>
    SPDX-FileCopyrightText: 2013-2018 Andrius Štikonas <andrius@stikonas.eu>
    SPDX-FileCopyrightText: 2019 Yuri Chornoivan <yurchor@ukr.net>
    SPDX-FileCopyrightText: 2020 Arnaud Ferraris <arnaud.ferraris@collabora.com>
    SPDX-FileCopyrightText: 2020 Gaël PORTAY <gael.portay@collabora.com>

    SPDX-License-Identifier: GPL-3.0-or-later
*/

#include "fs/reiserfs.h"

#include "util/externalcommand.h"
#include "util/capacity.h"

#include <QRegularExpression>
#include <QString>
#include <QStringList>
#include <QUuid>

namespace FS
{
FileSystem::CommandSupportType reiserfs::m_GetUsed = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType reiserfs::m_GetLabel = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType reiserfs::m_Create = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType reiserfs::m_Grow = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType reiserfs::m_Shrink = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType reiserfs::m_Move = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType reiserfs::m_Check = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType reiserfs::m_Copy = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType reiserfs::m_Backup = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType reiserfs::m_SetLabel = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType reiserfs::m_UpdateUUID = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType reiserfs::m_GetUUID = FileSystem::cmdSupportNone;

reiserfs::reiserfs(qint64 firstsector, qint64 lastsector, qint64 sectorsused, const QString& label, const QVariantMap& features) :
    FileSystem(firstsector, lastsector, sectorsused, label, features, FileSystem::Type::ReiserFS)
{
}

void reiserfs::init()
{
    m_GetLabel = cmdSupportCore;
    m_GetUsed = findExternal(QStringLiteral("debugreiserfs"), {}, 16) ? cmdSupportFileSystem : cmdSupportNone;
    m_SetLabel = findExternal(QStringLiteral("reiserfstune")) ? cmdSupportFileSystem : cmdSupportNone;
    m_Create = findExternal(QStringLiteral("mkfs.reiserfs")) ? cmdSupportFileSystem : cmdSupportNone;
    m_Check = findExternal(QStringLiteral("fsck.reiserfs")) ? cmdSupportFileSystem : cmdSupportNone;
    m_Move = m_Copy = (m_Check != cmdSupportNone) ? cmdSupportCore : cmdSupportNone;
    m_Grow = findExternal(QStringLiteral("resize_reiserfs"), {}, 16) ? cmdSupportFileSystem : cmdSupportNone;
    m_Shrink = (m_GetUsed != cmdSupportNone && m_Grow != cmdSupportNone) ? cmdSupportFileSystem : cmdSupportNone;
    m_Backup = cmdSupportCore;
    m_UpdateUUID = findExternal(QStringLiteral("reiserfstune")) ? cmdSupportFileSystem : cmdSupportNone;
    m_GetUUID = cmdSupportCore;
}

bool reiserfs::supportToolFound() const
{
    return
        m_GetUsed != cmdSupportNone &&
        m_GetLabel != cmdSupportNone &&
        m_SetLabel != cmdSupportNone &&
        m_Create != cmdSupportNone &&
        m_Check != cmdSupportNone &&
        m_UpdateUUID != cmdSupportNone &&
        m_Grow != cmdSupportNone &&
        m_Shrink != cmdSupportNone &&
        m_Copy != cmdSupportNone &&
        m_Move != cmdSupportNone &&
        m_Backup != cmdSupportNone &&
        m_GetUUID != cmdSupportNone;
}

FileSystem::SupportTool reiserfs::supportToolName() const
{
    return SupportTool(QStringLiteral("reiserfsprogs"), QUrl(QStringLiteral("https://reiser4.wiki.kernel.org/index.php/Reiserfsprogs")));
}

qint64 reiserfs::minCapacity() const
{
    return 32 * Capacity::unitFactor(Capacity::Unit::Byte, Capacity::Unit::MiB);
}

qint64 reiserfs::maxCapacity() const
{
    return 16 * Capacity::unitFactor(Capacity::Unit::Byte, Capacity::Unit::TiB) - Capacity::unitFactor(Capacity::Unit::Byte, Capacity::Unit::MiB);
}

int reiserfs::maxLabelLength() const
{
    return 16;
}

qint64 reiserfs::readUsedCapacity(const QString& deviceNode) const
{
    ExternalCommand cmd(QStringLiteral("debugreiserfs"), { deviceNode });

    if (cmd.run(-1) && cmd.exitCode() == 16) {
        qint64 blockCount = -1;
        QRegularExpression re(QStringLiteral("Count of blocks[^:]+: (\\d+)"));
        QRegularExpressionMatch reBlockCount = re.match(cmd.output());

        if (reBlockCount.hasMatch())
            blockCount = reBlockCount.captured(1).toLongLong();

        qint64 blockSize = -1;
        re.setPattern(QStringLiteral("Blocksize: (\\d+)"));
        QRegularExpressionMatch reBlockSize = re.match(cmd.output());

        if (reBlockSize.hasMatch())
            blockSize = reBlockSize.captured(1).toLongLong();

        qint64 freeBlocks = -1;
        re.setPattern(QStringLiteral("Free blocks[^:]+: (\\d+)"));
        QRegularExpressionMatch reFreeBlocks = re.match(cmd.output());

        if (reFreeBlocks.hasMatch())
            freeBlocks = reFreeBlocks.captured(1).toLongLong();

        if (blockCount > -1 && blockSize > -1 && freeBlocks > -1)
            return (blockCount - freeBlocks) * blockSize;
    }

    return -1;
}

bool reiserfs::writeLabel(Report& report, const QString& deviceNode, const QString& newLabel)
{
    ExternalCommand cmd(report, QStringLiteral("reiserfstune"), { QStringLiteral("--label"), newLabel, deviceNode });
    return cmd.run(-1) && cmd.exitCode() == 0;
}

bool reiserfs::check(Report& report, const QString& deviceNode) const
{
    ExternalCommand cmd(report, QStringLiteral("fsck.reiserfs"), { QStringLiteral("--fix-fixable"), QStringLiteral("--quiet"), QStringLiteral("--yes"), deviceNode });
    return cmd.run(-1) && (cmd.exitCode() == 0 || cmd.exitCode() == 1 || cmd.exitCode() == 256);
}

bool reiserfs::create(Report& report, const QString& deviceNode)
{
    ExternalCommand cmd(report, QStringLiteral("mkfs.reiserfs"), { QStringLiteral("-f"), deviceNode });
    return cmd.run(-1) && cmd.exitCode() == 0;
}

bool reiserfs::resize(Report& report, const QString& deviceNode, qint64 length) const
{
    ExternalCommand cmd(report, QStringLiteral("resize_reiserfs"),
                        { deviceNode, QStringLiteral("-q"), QStringLiteral("-s"), QString::number(length) });

    bool rval = cmd.write(QByteArrayLiteral("y\n"));

    if (!rval)
        return false;

    if (!cmd.start(-1))
        return false;

    return cmd.exitCode() == 0 || cmd.exitCode() == 256;
}

bool reiserfs::resizeOnline(Report& report, const QString& deviceNode, const QString&, qint64 length) const
{
    return resize(report, deviceNode, length);
}

bool reiserfs::updateUUID(Report& report, const QString& deviceNode) const
{
    const QString uuid = QUuid::createUuid().toString().remove(QRegularExpression(QStringLiteral("\\{|\\}")));
    ExternalCommand cmd(report, QStringLiteral("reiserfstune"), { QStringLiteral("--uuid"), uuid, deviceNode });
    return cmd.run(-1) && cmd.exitCode() == 0;
}
}