/*
    SPDX-FileCopyrightText: 2008-2010 Volker Lanz <vl@fidra.de>
    SPDX-FileCopyrightText: 2012-2018 Andrius Štikonas <andrius@stikonas.eu>
    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/ext2.h"

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

#include <QRegularExpression>
#include <QString>

namespace FS
{
FileSystem::CommandSupportType ext2::m_GetUsed = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType ext2::m_GetLabel = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType ext2::m_Create = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType ext2::m_Grow = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType ext2::m_Shrink = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType ext2::m_Move = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType ext2::m_Check = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType ext2::m_Copy = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType ext2::m_Backup = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType ext2::m_SetLabel = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType ext2::m_UpdateUUID = FileSystem::cmdSupportNone;
FileSystem::CommandSupportType ext2::m_GetUUID = FileSystem::cmdSupportNone;

ext2::ext2(qint64 firstsector, qint64 lastsector, qint64 sectorsused, const QString& label, const QVariantMap& features, FileSystem::Type t) :
    FileSystem(firstsector, lastsector, sectorsused, label, features, t)
{
}

void ext2::init()
{
    m_GetUsed = findExternal(QStringLiteral("dumpe2fs")) ? cmdSupportFileSystem : cmdSupportNone;
    m_GetLabel = cmdSupportCore;
    m_SetLabel = findExternal(QStringLiteral("e2label")) ? cmdSupportFileSystem : cmdSupportNone;
    m_Create = findExternal(QStringLiteral("mkfs.ext2")) ? cmdSupportFileSystem : cmdSupportNone;
    m_Check = findExternal(QStringLiteral("e2fsck"), { QStringLiteral("-V") }) ? cmdSupportFileSystem : cmdSupportNone;
    m_UpdateUUID = findExternal(QStringLiteral("tune2fs")) ? cmdSupportFileSystem : cmdSupportNone;
    m_Grow = (m_Check != cmdSupportNone && findExternal(QStringLiteral("resize2fs"))) ? cmdSupportFileSystem : cmdSupportNone;
    m_Shrink = (m_Grow != cmdSupportNone && m_GetUsed) != cmdSupportNone ? cmdSupportFileSystem : cmdSupportNone;
    m_Copy = (m_Check != cmdSupportNone) ? cmdSupportCore : cmdSupportNone;
    m_Move = (m_Check != cmdSupportNone) ? cmdSupportCore : cmdSupportNone;
    m_Backup = cmdSupportCore;
    m_GetUUID = cmdSupportCore;

    if (m_Create == cmdSupportFileSystem) {
        addAvailableFeature(QStringLiteral("64bit"));
        addAvailableFeature(QStringLiteral("bigalloc"));
        addAvailableFeature(QStringLiteral("casefold"));
        addAvailableFeature(QStringLiteral("dir_index"));
        addAvailableFeature(QStringLiteral("dir_nlink"));
        addAvailableFeature(QStringLiteral("ea_inode"));
        addAvailableFeature(QStringLiteral("encrypt"));
        addAvailableFeature(QStringLiteral("ext_attr"));
        addAvailableFeature(QStringLiteral("extent"));
        addAvailableFeature(QStringLiteral("extra_isize"));
        addAvailableFeature(QStringLiteral("filetype"));
        addAvailableFeature(QStringLiteral("flex_bg"));
        addAvailableFeature(QStringLiteral("has_journal"));
        addAvailableFeature(QStringLiteral("huge_file"));
        addAvailableFeature(QStringLiteral("inline_data"));
        addAvailableFeature(QStringLiteral("journal_dev"));
        addAvailableFeature(QStringLiteral("large_dir"));
        addAvailableFeature(QStringLiteral("large_file"));
        addAvailableFeature(QStringLiteral("metadata_csum"));
        addAvailableFeature(QStringLiteral("metadata_csum_seed"));
        addAvailableFeature(QStringLiteral("meta_bg"));
        addAvailableFeature(QStringLiteral("mmp"));
        addAvailableFeature(QStringLiteral("project"));
        addAvailableFeature(QStringLiteral("quota"));
        addAvailableFeature(QStringLiteral("resize_inode"));
        addAvailableFeature(QStringLiteral("sparse_super"));
        addAvailableFeature(QStringLiteral("sparse_super2"));
        addAvailableFeature(QStringLiteral("uninit_bg"));
    }
}

bool ext2::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 ext2::supportToolName() const
{
    return SupportTool(QStringLiteral("e2fsprogs"), QUrl(QStringLiteral("http://e2fsprogs.sf.net")));
}

qint64 ext2::maxCapacity() const
{
    return 16 * Capacity::unitFactor(Capacity::Unit::Byte, Capacity::Unit::TiB) - Capacity::unitFactor(Capacity::Unit::Byte, Capacity::Unit::MiB);
}

int ext2::maxLabelLength() const
{
    return 16;
}

qint64 ext2::readUsedCapacity(const QString& deviceNode) const
{
    ExternalCommand cmd(QStringLiteral("dumpe2fs"), { QStringLiteral("-h"), deviceNode });

    if (cmd.run()) {
        qint64 blockCount = -1;
        QRegularExpression re(QStringLiteral("Block count:\\s+(\\d+)"));
        QRegularExpressionMatch reBlockCount = re.match(cmd.output());

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

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

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

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

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

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

    return -1;
}

bool ext2::check(Report& report, const QString& deviceNode) const
{
    ExternalCommand cmd(report, QStringLiteral("e2fsck"), { QStringLiteral("-f"), QStringLiteral("-y"), QStringLiteral("-v"), deviceNode });
    return cmd.run(-1) && (cmd.exitCode() == 0 || cmd.exitCode() == 1 || cmd.exitCode() == 2 || cmd.exitCode() == 256);
}

bool ext2::create(Report& report, const QString& deviceNode)
{
    QStringList args = QStringList();

    if (!this->features().isEmpty()) {
        QStringList feature_list = QStringList();
        for (const auto& k : this->features().keys()) {
	    const auto& v = this->features().value(k);
            if (v.type() == QVariant::Type::Bool) {
                if (v.toBool())
                    feature_list << k;
		else
                    feature_list << (QStringLiteral("^") +  k);
            } else {
                qWarning() << "Ignoring feature" << k << "of type" << v.type() << "; requires type QVariant::bool.";
            }
        }
        args << QStringLiteral("-O") << feature_list.join(QStringLiteral(","));
    }
    args << QStringLiteral("-qF") << deviceNode;

    ExternalCommand cmd(report, QStringLiteral("mkfs.ext2"), args);
    return cmd.run(-1) && cmd.exitCode() == 0;
}

bool ext2::resize(Report& report, const QString& deviceNode, qint64 length) const
{
    const QString len = QString::number(length / 512) + QStringLiteral("s");

    ExternalCommand cmd(report, QStringLiteral("resize2fs"), { deviceNode, len });
    return cmd.run(-1) && cmd.exitCode() == 0;
}

bool ext2::writeLabel(Report& report, const QString& deviceNode, const QString& newLabel)
{
    ExternalCommand cmd(report, QStringLiteral("e2label"), { deviceNode, newLabel });
    return cmd.run(-1) && cmd.exitCode() == 0;
}

bool ext2::writeLabelOnline(Report& report, const QString& deviceNode, const QString& mountPoint, const QString& newLabel)
{
    Q_UNUSED(mountPoint)
    return writeLabel(report, deviceNode, newLabel);
}

bool ext2::updateUUID(Report& report, const QString& deviceNode) const
{
    ExternalCommand cmd(report, QStringLiteral("tune2fs"), { QStringLiteral("-U"), QStringLiteral("random"), deviceNode });
    return cmd.run(-1) && cmd.exitCode() == 0;
}
}