/* === This file is part of Calamares - <https://calamares.io> ===
 *
 *   SPDX-FileCopyrightText: 2014-2017 Teo Mrnjavac <teo@kde.org>
 *   SPDX-FileCopyrightText: 2017-2018 Adriaan de Groot <groot@kde.org>
 *   SPDX-FileCopyrightText: 2018-2019 Collabora Ltd <arnaud.ferraris@collabora.com>
 *   SPDX-License-Identifier: GPL-3.0-or-later
 *
 *   Calamares is Free Software: see the License-Identifier above.
 *
 */

#include "GlobalStorage.h"
#include "JobQueue.h"

#include "utils/Logger.h"

#include "core/PartitionLayout.h"

#include "core/KPMHelpers.h"
#include "core/PartUtils.h"
#include "core/PartitionActions.h"
#include "core/PartitionInfo.h"

#include "utils/Variant.h"

#include <kpmcore/core/device.h>
#include <kpmcore/core/partition.h>
#include <kpmcore/fs/filesystem.h>

static FileSystem::Type
getDefaultFileSystemType()
{
    Calamares::GlobalStorage* gs = Calamares::JobQueue::instance()->globalStorage();
    FileSystem::Type defaultFS = FileSystem::Ext4;

    if ( gs->contains( "defaultFileSystemType" ) )
    {
        PartUtils::findFS( gs->value( "defaultFileSystemType" ).toString(), &defaultFS );
        if ( defaultFS == FileSystem::Unknown )
        {
            defaultFS = FileSystem::Ext4;
        }
    }

    return defaultFS;
}

PartitionLayout::PartitionLayout()
    : m_defaultFsType( getDefaultFileSystemType() )
{
}

PartitionLayout::PartitionLayout( const PartitionLayout& layout )
    : m_defaultFsType( layout.m_defaultFsType )
    , m_partLayout( layout.m_partLayout )
{
}

PartitionLayout::~PartitionLayout() {}

PartitionLayout::PartitionEntry::PartitionEntry()
    : partAttributes( 0 )
{
}

PartitionLayout::PartitionEntry::PartitionEntry( FileSystem::Type type, const QString& mountPoint, const QString& size, const QString& minSize, const QString& maxSize )
    : partType( type )
    , partAttributes( 0 )
    , partMountPoint( mountPoint )
    , partSize( size )
    , partMinSize( minSize )
    , partMaxSize( maxSize )
{
}

PartitionLayout::PartitionEntry::PartitionEntry( const QString& label,
                                                 const QString& uuid,
                                                 const QString& type,
                                                 quint64 attributes,
                                                 const QString& mountPoint,
                                                 const QString& fs,
                                                 const QVariantMap& features,
                                                 const QString& size,
                                                 const QString& minSize,
                                                 const QString& maxSize )
    : partLabel( label )
    , partUUID( uuid )
    , partType( type )
    , partAttributes( attributes )
    , partMountPoint( mountPoint )
    , partFeatures( features )
    , partSize( size )
    , partMinSize( minSize )
    , partMaxSize( maxSize )
{
    PartUtils::findFS( fs, &partFileSystem );
}


bool
PartitionLayout::addEntry( const PartitionEntry& entry )
{
    if ( !entry.isValid() )
    {
        return false;
    }

    m_partLayout.append( entry );

    return true;
}

void
PartitionLayout::init( const QVariantList& config )
{
    bool ok;

    m_partLayout.clear();

    for ( const auto& r : config )
    {
        QVariantMap pentry = r.toMap();

        if ( !pentry.contains( "name" ) || !pentry.contains( "mountPoint" ) || !pentry.contains( "filesystem" )
             || !pentry.contains( "size" ) )
        {
            cError() << "Partition layout entry #" << config.indexOf( r )
                     << "lacks mandatory attributes, switching to default layout.";
            m_partLayout.clear();
            break;
        }

        if ( !addEntry( { CalamaresUtils::getString( pentry, "name" ),
                          CalamaresUtils::getString( pentry, "uuid" ),
                          CalamaresUtils::getString( pentry, "type" ),
                          CalamaresUtils::getUnsignedInteger( pentry, "attributes", 0 ),
                          CalamaresUtils::getString( pentry, "mountPoint" ),
                          CalamaresUtils::getString( pentry, "filesystem" ),
                          CalamaresUtils::getSubMap( pentry, "features", ok ),
                          CalamaresUtils::getString( pentry, "size", QStringLiteral( "0" ) ),
                          CalamaresUtils::getString( pentry, "minSize", QStringLiteral( "0" ) ),
                          CalamaresUtils::getString( pentry, "maxSize", QStringLiteral( "0" ) ) } ) )
        {
            cError() << "Partition layout entry #" << config.indexOf( r ) << "is invalid, switching to default layout.";
            m_partLayout.clear();
            break;
        }
    }

    if ( !m_partLayout.count() )
    {
        addEntry( { m_defaultFsType, QString( "/" ), QString( "100%" ) } );
    }
}

QList< Partition* >
PartitionLayout::createPartitions( Device* dev,
                                   qint64 firstSector,
                                   qint64 lastSector,
                                   QString luksPassphrase,
                                   PartitionNode* parent,
                                   const PartitionRole& role )
{
    QList< Partition* > partList;
    // Map each partition entry to its requested size (0 when calculated later)
    QMap< const PartitionLayout::PartitionEntry*, qint64 > partSectorsMap;
    const qint64 totalSectors = lastSector - firstSector + 1;
    qint64 currentSector, availableSectors = totalSectors;

    // Let's check if we have enough space for each partitions, using the size
    // propery or the min-size property if unit is in percentage.
    for ( const auto& entry : qAsConst( m_partLayout ) )
    {
        if ( !entry.partSize.isValid() )
        {
            cWarning() << "Partition" << entry.partMountPoint << "size is invalid, skipping...";
            continue;
        }

        // Calculate partition size: Rely on "possibly uninitialized use"
        // warnings to ensure that all the cases are covered below.
        // We need to ignore the percent-defined until later
        qint64 sectors = 0;
        if ( entry.partSize.unit() != CalamaresUtils::Partition::SizeUnit::Percent )
        {
            sectors = entry.partSize.toSectors( totalSectors, dev->logicalSize() );
        }
        else if ( entry.partMinSize.isValid() )
        {
            sectors = entry.partMinSize.toSectors( totalSectors, dev->logicalSize() );
        }
        partSectorsMap.insert( &entry, sectors );
        availableSectors -= sectors;
    }

    // There is not enough space for all partitions, use the min-size property
    // and see if we can do better afterward.
    if ( availableSectors < 0 )
    {
        availableSectors = totalSectors;
        for ( const auto& entry : qAsConst( m_partLayout ) )
        {
            qint64 sectors = partSectorsMap.value( &entry );
            if ( entry.partMinSize.isValid() )
            {
                sectors = entry.partMinSize.toSectors( totalSectors, dev->logicalSize() );
                partSectorsMap.insert( &entry, sectors );
            }
            availableSectors -= sectors;
        }
    }

    // Assign sectors for percentage-defined partitions.
    for ( const auto& entry : qAsConst( m_partLayout ) )
    {
        if ( entry.partSize.unit() == CalamaresUtils::Partition::SizeUnit::Percent )
        {
            qint64 sectors = entry.partSize.toSectors( availableSectors + partSectorsMap.value( &entry ),
                                                      dev->logicalSize() );
            if ( entry.partMinSize.isValid() )
            {
                sectors = std::max( sectors, entry.partMinSize.toSectors( totalSectors, dev->logicalSize() ) );
            }
            if ( entry.partMaxSize.isValid() )
            {
                sectors = std::min( sectors, entry.partMaxSize.toSectors( totalSectors, dev->logicalSize() ) );
            }
            partSectorsMap.insert( &entry, sectors );
        }
    }

    // Create the partitions.
    currentSector = firstSector;
    availableSectors = totalSectors;
    for ( const auto& entry : qAsConst( m_partLayout ) )
    {
        // Adjust partition size based on available space.
        qint64 sectors = partSectorsMap.value( &entry );
        sectors = std::min( sectors, availableSectors );
        if ( sectors == 0 )
        {
            continue;
        }

        Partition* part = nullptr;
        if ( luksPassphrase.isEmpty() )
        {
            part = KPMHelpers::createNewPartition(
                parent, *dev, role, entry.partFileSystem, currentSector, currentSector + sectors - 1, KPM_PARTITION_FLAG( None ) );
        }
        else
        {
            part = KPMHelpers::createNewEncryptedPartition(
                parent, *dev, role, entry.partFileSystem, currentSector, currentSector + sectors - 1, luksPassphrase, KPM_PARTITION_FLAG( None ) );
        }
        PartitionInfo::setFormat( part, true );
        PartitionInfo::setMountPoint( part, entry.partMountPoint );
        if ( !entry.partLabel.isEmpty() )
        {
            part->setLabel( entry.partLabel );
            part->fileSystem().setLabel( entry.partLabel );
        }
        if ( !entry.partUUID.isEmpty() )
        {
            part->setUUID( entry.partUUID );
        }
        if ( !entry.partType.isEmpty() )
        {
#if defined( WITH_KPMCORE42API )
            part->setType( entry.partType );
#else
            cWarning() << "Ignoring type; requires KPMcore >= 4.2.0.";
#endif
        }
        if ( entry.partAttributes )
        {
#if defined( WITH_KPMCORE42API )
            part->setAttributes( entry.partAttributes );
#else
            cWarning() << "Ignoring attributes; requires KPMcore >= 4.2.0.";
#endif
        }
        if ( !entry.partFeatures.isEmpty() )
        {
#if defined( WITH_KPMCORE42API )
            for ( const auto& k : entry.partFeatures.keys() )
            {
                part->fileSystem().addFeature( k, entry.partFeatures.value( k ) );
            }
#else
            cWarning() << "Ignoring features; requires KPMcore >= 4.2.0.";
#endif
        }
        // Some buggy (legacy) BIOSes test if the bootflag of at least one partition is set.
        // Otherwise they ignore the device in boot-order, so add it here.
        partList.append( part );
        currentSector += sectors;
        availableSectors -= sectors;
    }

    return partList;
}