/*
 *  Copyright (C) 2010 Felix Geyer <debfx@fobos.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 2 or (at your option)
 *  version 3 of the License.
 *
 *  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 "Metadata.h"
#include <QtCore/QCryptographicHash>

#include "core/Clock.h"
#include "core/Entry.h"
#include "core/Group.h"
#include "core/Tools.h"

const int Metadata::DefaultHistoryMaxItems = 10;
const int Metadata::DefaultHistoryMaxSize = 6 * 1024 * 1024;

Metadata::Metadata(QObject* parent)
    : QObject(parent)
    , m_customData(new CustomData(this))
    , m_updateDatetime(true)
{
    m_data.generator = "KeePassXC";
    m_data.maintenanceHistoryDays = 365;
    m_data.masterKeyChangeRec = -1;
    m_data.masterKeyChangeForce = -1;
    m_data.historyMaxItems = DefaultHistoryMaxItems;
    m_data.historyMaxSize = DefaultHistoryMaxSize;
    m_data.recycleBinEnabled = true;
    m_data.protectTitle = false;
    m_data.protectUsername = false;
    m_data.protectPassword = true;
    m_data.protectUrl = false;
    m_data.protectNotes = false;

    QDateTime now = Clock::currentDateTimeUtc();
    m_data.nameChanged = now;
    m_data.descriptionChanged = now;
    m_data.defaultUserNameChanged = now;
    m_recycleBinChanged = now;
    m_entryTemplatesGroupChanged = now;
    m_masterKeyChanged = now;
    m_settingsChanged = now;

    connect(m_customData, SIGNAL(customDataModified()), this, SIGNAL(metadataModified()));
}

template <class P, class V> bool Metadata::set(P& property, const V& value)
{
    if (property != value) {
        property = value;
        emit metadataModified();
        return true;
    } else {
        return false;
    }
}

template <class P, class V> bool Metadata::set(P& property, const V& value, QDateTime& dateTime)
{
    if (property != value) {
        property = value;
        if (m_updateDatetime) {
            dateTime = Clock::currentDateTimeUtc();
        }
        emit metadataModified();
        return true;
    } else {
        return false;
    }
}

void Metadata::setUpdateDatetime(bool value)
{
    m_updateDatetime = value;
}

void Metadata::copyAttributesFrom(const Metadata* other)
{
    m_data = other->m_data;
}

QString Metadata::generator() const
{
    return m_data.generator;
}

QString Metadata::name() const
{
    return m_data.name;
}

QDateTime Metadata::nameChanged() const
{
    return m_data.nameChanged;
}

QString Metadata::description() const
{
    return m_data.description;
}

QDateTime Metadata::descriptionChanged() const
{
    return m_data.descriptionChanged;
}

QString Metadata::defaultUserName() const
{
    return m_data.defaultUserName;
}

QDateTime Metadata::defaultUserNameChanged() const
{
    return m_data.defaultUserNameChanged;
}

int Metadata::maintenanceHistoryDays() const
{
    return m_data.maintenanceHistoryDays;
}

QColor Metadata::color() const
{
    return m_data.color;
}

bool Metadata::protectTitle() const
{
    return m_data.protectTitle;
}

bool Metadata::protectUsername() const
{
    return m_data.protectUsername;
}

bool Metadata::protectPassword() const
{
    return m_data.protectPassword;
}

bool Metadata::protectUrl() const
{
    return m_data.protectUrl;
}

bool Metadata::protectNotes() const
{
    return m_data.protectNotes;
}

QImage Metadata::customIcon(const QUuid& uuid) const
{
    return m_customIcons.value(uuid);
}

QPixmap Metadata::customIconPixmap(const QUuid& uuid) const
{
    QPixmap pixmap;

    if (!m_customIcons.contains(uuid)) {
        return pixmap;
    }

    QPixmapCache::Key& cacheKey = m_customIconCacheKeys[uuid];

    if (!QPixmapCache::find(cacheKey, &pixmap)) {
        pixmap = QPixmap::fromImage(m_customIcons.value(uuid));
        cacheKey = QPixmapCache::insert(pixmap);
    }

    return pixmap;
}

QPixmap Metadata::customIconScaledPixmap(const QUuid& uuid) const
{
    QPixmap pixmap;

    if (!m_customIcons.contains(uuid)) {
        return pixmap;
    }

    QPixmapCache::Key& cacheKey = m_customIconScaledCacheKeys[uuid];

    if (!QPixmapCache::find(cacheKey, &pixmap)) {
        QImage image = m_customIcons.value(uuid).scaled(16, 16, Qt::KeepAspectRatio, Qt::SmoothTransformation);
        pixmap = QPixmap::fromImage(image);
        cacheKey = QPixmapCache::insert(pixmap);
    }

    return pixmap;
}

bool Metadata::containsCustomIcon(const QUuid& uuid) const
{
    return m_customIcons.contains(uuid);
}

QHash<QUuid, QImage> Metadata::customIcons() const
{
    return m_customIcons;
}

QHash<QUuid, QPixmap> Metadata::customIconsScaledPixmaps() const
{
    QHash<QUuid, QPixmap> result;

    for (const QUuid& uuid : m_customIconsOrder) {
        result.insert(uuid, customIconScaledPixmap(uuid));
    }

    return result;
}

QList<QUuid> Metadata::customIconsOrder() const
{
    return m_customIconsOrder;
}

bool Metadata::recycleBinEnabled() const
{
    return m_data.recycleBinEnabled;
}

Group* Metadata::recycleBin()
{
    return m_recycleBin;
}

const Group* Metadata::recycleBin() const
{
    return m_recycleBin;
}

QDateTime Metadata::recycleBinChanged() const
{
    return m_recycleBinChanged;
}

const Group* Metadata::entryTemplatesGroup() const
{
    return m_entryTemplatesGroup;
}

QDateTime Metadata::entryTemplatesGroupChanged() const
{
    return m_entryTemplatesGroupChanged;
}

const Group* Metadata::lastSelectedGroup() const
{
    return m_lastSelectedGroup;
}

const Group* Metadata::lastTopVisibleGroup() const
{
    return m_lastTopVisibleGroup;
}

QDateTime Metadata::masterKeyChanged() const
{
    return m_masterKeyChanged;
}

int Metadata::masterKeyChangeRec() const
{
    return m_data.masterKeyChangeRec;
}

int Metadata::masterKeyChangeForce() const
{
    return m_data.masterKeyChangeForce;
}

int Metadata::historyMaxItems() const
{
    return m_data.historyMaxItems;
}

int Metadata::historyMaxSize() const
{
    return m_data.historyMaxSize;
}

CustomData* Metadata::customData()
{
    return m_customData;
}

const CustomData* Metadata::customData() const
{
    return m_customData;
}

void Metadata::setGenerator(const QString& value)
{
    set(m_data.generator, value);
}

void Metadata::setName(const QString& value)
{
    set(m_data.name, value, m_data.nameChanged);
}

void Metadata::setNameChanged(const QDateTime& value)
{
    Q_ASSERT(value.timeSpec() == Qt::UTC);
    m_data.nameChanged = value;
}

void Metadata::setDescription(const QString& value)
{
    set(m_data.description, value, m_data.descriptionChanged);
}

void Metadata::setDescriptionChanged(const QDateTime& value)
{
    Q_ASSERT(value.timeSpec() == Qt::UTC);
    m_data.descriptionChanged = value;
}

void Metadata::setDefaultUserName(const QString& value)
{
    set(m_data.defaultUserName, value, m_data.defaultUserNameChanged);
}

void Metadata::setDefaultUserNameChanged(const QDateTime& value)
{
    Q_ASSERT(value.timeSpec() == Qt::UTC);
    m_data.defaultUserNameChanged = value;
}

void Metadata::setMaintenanceHistoryDays(int value)
{
    set(m_data.maintenanceHistoryDays, value);
}

void Metadata::setColor(const QColor& value)
{
    set(m_data.color, value);
}

void Metadata::setProtectTitle(bool value)
{
    set(m_data.protectTitle, value);
}

void Metadata::setProtectUsername(bool value)
{
    set(m_data.protectUsername, value);
}

void Metadata::setProtectPassword(bool value)
{
    set(m_data.protectPassword, value);
}

void Metadata::setProtectUrl(bool value)
{
    set(m_data.protectUrl, value);
}

void Metadata::setProtectNotes(bool value)
{
    set(m_data.protectNotes, value);
}

void Metadata::addCustomIcon(const QUuid& uuid, const QImage& icon)
{
    Q_ASSERT(!uuid.isNull());
    Q_ASSERT(!m_customIcons.contains(uuid));

    m_customIcons.insert(uuid, icon);
    // reset cache in case there is also an icon with that uuid
    m_customIconCacheKeys[uuid] = QPixmapCache::Key();
    m_customIconScaledCacheKeys[uuid] = QPixmapCache::Key();
    m_customIconsOrder.append(uuid);
    // Associate image hash to uuid
    QByteArray hash = hashImage(icon);
    m_customIconsHashes[hash] = uuid;
    Q_ASSERT(m_customIcons.count() == m_customIconsOrder.count());
    emit metadataModified();
}

void Metadata::addCustomIconScaled(const QUuid& uuid, const QImage& icon)
{
    QImage iconScaled;

    // scale down to 128x128 if icon is larger
    if (icon.width() > 128 || icon.height() > 128) {
        iconScaled = icon.scaled(QSize(128, 128), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    } else {
        iconScaled = icon;
    }

    addCustomIcon(uuid, iconScaled);
}

void Metadata::removeCustomIcon(const QUuid& uuid)
{
    Q_ASSERT(!uuid.isNull());
    Q_ASSERT(m_customIcons.contains(uuid));

    // Remove hash record only if this is the same uuid
    QByteArray hash = hashImage(m_customIcons[uuid]);
    if (m_customIconsHashes.contains(hash) && m_customIconsHashes[hash] == uuid) {
        m_customIconsHashes.remove(hash);
    }

    m_customIcons.remove(uuid);
    QPixmapCache::remove(m_customIconCacheKeys.value(uuid));
    m_customIconCacheKeys.remove(uuid);
    QPixmapCache::remove(m_customIconScaledCacheKeys.value(uuid));
    m_customIconScaledCacheKeys.remove(uuid);
    m_customIconsOrder.removeAll(uuid);
    Q_ASSERT(m_customIcons.count() == m_customIconsOrder.count());
    emit metadataModified();
}

QUuid Metadata::findCustomIcon(const QImage& candidate)
{
    QByteArray hash = hashImage(candidate);
    return m_customIconsHashes.value(hash, QUuid());
}

void Metadata::copyCustomIcons(const QSet<QUuid>& iconList, const Metadata* otherMetadata)
{
    for (const QUuid& uuid : iconList) {
        Q_ASSERT(otherMetadata->containsCustomIcon(uuid));

        if (!containsCustomIcon(uuid) && otherMetadata->containsCustomIcon(uuid)) {
            addCustomIcon(uuid, otherMetadata->customIcon(uuid));
        }
    }
}

QByteArray Metadata::hashImage(const QImage& image)
{
#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
    auto data = QByteArray(reinterpret_cast<const char*>(image.bits()), static_cast<int>(image.sizeInBytes()));
#else
    auto data = QByteArray(reinterpret_cast<const char*>(image.bits()), image.byteCount());
#endif
    return QCryptographicHash::hash(data, QCryptographicHash::Md5);
}

void Metadata::setRecycleBinEnabled(bool value)
{
    set(m_data.recycleBinEnabled, value);
}

void Metadata::setRecycleBin(Group* group)
{
    set(m_recycleBin, group, m_recycleBinChanged);
}

void Metadata::setRecycleBinChanged(const QDateTime& value)
{
    Q_ASSERT(value.timeSpec() == Qt::UTC);
    m_recycleBinChanged = value;
}

void Metadata::setEntryTemplatesGroup(Group* group)
{
    set(m_entryTemplatesGroup, group, m_entryTemplatesGroupChanged);
}

void Metadata::setEntryTemplatesGroupChanged(const QDateTime& value)
{
    Q_ASSERT(value.timeSpec() == Qt::UTC);
    m_entryTemplatesGroupChanged = value;
}

void Metadata::setLastSelectedGroup(Group* group)
{
    set(m_lastSelectedGroup, group);
}

void Metadata::setLastTopVisibleGroup(Group* group)
{
    set(m_lastTopVisibleGroup, group);
}

void Metadata::setMasterKeyChanged(const QDateTime& value)
{
    Q_ASSERT(value.timeSpec() == Qt::UTC);
    m_masterKeyChanged = value;
}

void Metadata::setMasterKeyChangeRec(int value)
{
    set(m_data.masterKeyChangeRec, value);
}

void Metadata::setMasterKeyChangeForce(int value)
{
    set(m_data.masterKeyChangeForce, value);
}

void Metadata::setHistoryMaxItems(int value)
{
    set(m_data.historyMaxItems, value);
}

void Metadata::setHistoryMaxSize(int value)
{
    set(m_data.historyMaxSize, value);
}

QDateTime Metadata::settingsChanged() const
{
    return m_settingsChanged;
}

void Metadata::setSettingsChanged(const QDateTime& value)
{
    Q_ASSERT(value.timeSpec() == Qt::UTC);
    m_settingsChanged = value;
}