/*

  Copyright (c) 2009-2017 Montel Laurent <montel@kde.org>

  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License, version 2, as
  published by the Free Software Foundation.

  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, write to the Free Software Foundation, Inc.,
  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "foldersettings.h"
#include "kernel/mailkernel.h"
#include "util/mailutil.h"
#include "util/resourcereadconfigfile.h"
#include <PimCommon/PimUtil>
#include <AkonadiCore/NewMailNotifierAttribute>
#include "mailcommon_debug.h"
#include <ItemFetchJob>
#include <ItemFetchScope>
#include <CollectionModifyJob>

using namespace Akonadi;

#include <KIdentityManagement/IdentityManager>
#include <KIdentityManagement/Identity>

#include <QMutex>
#include <QMutexLocker>
#include <QSharedPointer>

namespace MailCommon {
static QMutex mapMutex;
static QMap<Collection::Id, QSharedPointer<FolderSettings> > fcMap;

QSharedPointer<FolderSettings> FolderSettings::forCollection(
    const Akonadi::Collection &coll, bool writeConfig)
{
    QMutexLocker lock(&mapMutex);

    QSharedPointer<FolderSettings> sptr = fcMap.value(coll.id());

    if (!sptr) {
        sptr = QSharedPointer<FolderSettings>(new FolderSettings(coll, writeConfig));
        fcMap.insert(coll.id(), sptr);
    } else {
        sptr->setCollection(coll);
        if (!sptr->isWriteConfig() && writeConfig) {
            sptr->setWriteConfig(true);
        }
    }

    return sptr;
}

FolderSettings::FolderSettings(const Akonadi::Collection &col, bool writeconfig)
    : mCollection(col)
    , mFormatMessage(MessageViewer::Viewer::Unknown)
    , mPutRepliesInSameFolder(false)
    , mHideInSelectionDialog(false)
    , mWriteConfig(writeconfig)
{
    Q_ASSERT(col.isValid());
    mIdentity = KernelIf->identityManager()->defaultIdentity().uoid();

    readConfig();
    connect(KernelIf->identityManager(), QOverload<>::of(&KIdentityManagement::IdentityManager::changed),
            this, &FolderSettings::slotIdentitiesChanged);
}

FolderSettings::~FolderSettings()
{
    //qCDebug(MAILCOMMON_LOG)<<" FolderCollection::~FolderCollection"<<this;
    if (mWriteConfig) {
        writeConfig();
    }
}

MessageViewer::Viewer::DisplayFormatMessage FolderSettings::formatMessage() const
{
    return mFormatMessage;
}

void FolderSettings::setFormatMessage(MessageViewer::Viewer::DisplayFormatMessage formatMessage)
{
    mFormatMessage = formatMessage;
}

void FolderSettings::clearCache()
{
    QMutexLocker lock(&mapMutex);
    fcMap.clear();
}

void FolderSettings::resetHtmlFormat()
{
    QMutexLocker lock(&mapMutex);
    QMap<Collection::Id, QSharedPointer<FolderSettings> >::const_iterator i = fcMap.constBegin();
    while (i != fcMap.constEnd()) {
        i.value()->setFormatMessage(MessageViewer::Viewer::UseGlobalSetting);
        ++i;
    }
}

bool FolderSettings::isWriteConfig() const
{
    return mWriteConfig;
}

void FolderSettings::setWriteConfig(bool writeConfig)
{
    mWriteConfig = writeConfig;
}

QString FolderSettings::name() const
{
    return mCollection.name();
}

bool FolderSettings::isSystemFolder() const
{
    return Kernel::self()->isSystemFolderCollection(mCollection);
}

bool FolderSettings::isStructural() const
{
    return mCollection.contentMimeTypes().isEmpty();
}

bool FolderSettings::isReadOnly() const
{
    return mCollection.rights() & Akonadi::Collection::ReadOnly;
}

bool FolderSettings::canDeleteMessages() const
{
    return mCollection.rights() & Akonadi::Collection::CanDeleteItem;
}

bool FolderSettings::canCreateMessages() const
{
    return mCollection.rights() & Akonadi::Collection::CanCreateItem;
}

qint64 FolderSettings::count() const
{
    return mCollection.statistics().count();
}

Akonadi::Collection::Rights FolderSettings::rights() const
{
    return mCollection.rights();
}

Akonadi::CollectionStatistics FolderSettings::statistics() const
{
    return mCollection.statistics();
}

void FolderSettings::setCollection(const Akonadi::Collection &collection)
{
    mCollection = collection;
}

void FolderSettings::slotIdentitiesChanged()
{
    uint defaultIdentity = KernelIf->identityManager()->defaultIdentity().uoid();
    // The default identity may have changed, therefore set it again if necessary
    if (mUseDefaultIdentity) {
        mIdentity = defaultIdentity;
    }

    // Fall back to the default identity if the one used currently is invalid
    if (KernelIf->identityManager()->identityForUoid(mIdentity).isNull()) {
        mIdentity = defaultIdentity;
        mUseDefaultIdentity = true;
    }
}

QString FolderSettings::configGroupName(const Akonadi::Collection &col)
{
    return QStringLiteral("Folder-%1").arg(QString::number(col.id()));
}

void FolderSettings::readConfig()
{
    KConfigGroup configGroup(KernelIf->config(), configGroupName(mCollection));
    mMailingListEnabled = configGroup.readEntry("MailingListEnabled", false);
    mMailingList.readConfig(configGroup);

    mUseDefaultIdentity = configGroup.readEntry("UseDefaultIdentity", true);
    uint defaultIdentity = KernelIf->identityManager()->defaultIdentity().uoid();
    mIdentity = configGroup.readEntry("Identity", defaultIdentity);
    slotIdentitiesChanged();

    mPutRepliesInSameFolder = configGroup.readEntry("PutRepliesInSameFolder", false);
    mHideInSelectionDialog = configGroup.readEntry("HideInSelectionDialog", false);

    if (configGroup.hasKey(QStringLiteral("IgnoreNewMail"))) {
        if (configGroup.readEntry(QStringLiteral("IgnoreNewMail"), false)) {
            //migrate config.
            Akonadi::NewMailNotifierAttribute *newMailNotifierAttr = mCollection.attribute<Akonadi::NewMailNotifierAttribute>(Akonadi::Collection::AddIfMissing);
            newMailNotifierAttr->setIgnoreNewMail(true);
            new Akonadi::CollectionModifyJob(mCollection, this);
            //TODO verify if it works;
        }
        configGroup.deleteEntry("IgnoreNewMail");
    }

    const QString shortcut(configGroup.readEntry("Shortcut"));
    if (!shortcut.isEmpty()) {
        QKeySequence sc(shortcut);
        setShortcut(sc);
    }

    mFormatMessage = static_cast<MessageViewer::Viewer::DisplayFormatMessage>(configGroup.readEntry("displayFormatOverride",
                                                                                                    static_cast<int>(MessageViewer::Viewer::UseGlobalSetting)));
}

bool FolderSettings::isValid() const
{
    return mCollection.isValid();
}

void FolderSettings::writeConfig() const
{
    Q_ASSERT_X(!mCollection.resource().isEmpty(), "FolderSettings::writeConfig", "No resource found in collection");
    KConfigGroup configGroup(KernelIf->config(), configGroupName(mCollection));

    configGroup.writeEntry("MailingListEnabled", mMailingListEnabled);
    mMailingList.writeConfig(configGroup);

    configGroup.writeEntry("UseDefaultIdentity", mUseDefaultIdentity);

    if (!mUseDefaultIdentity) {
        uint defaultIdentityId = -1;

        if (PimCommon::Util::isImapResource(mCollection.resource())) {
            MailCommon::ResourceReadConfigFile resourceFile(mCollection.resource());
            KConfigGroup grp = resourceFile.group(QStringLiteral("cache"));
            if (grp.isValid()) {
                defaultIdentityId = grp.readEntry(QStringLiteral("AccountIdentity"), -1);
            }
        } else {
            defaultIdentityId = KernelIf->identityManager()->defaultIdentity().uoid();
        }

        if (mIdentity != defaultIdentityId) {
            configGroup.writeEntry("Identity", mIdentity);
        } else {
            configGroup.deleteEntry("Identity");
        }
    } else {
        configGroup.deleteEntry("Identity");
    }

    configGroup.writeEntry("PutRepliesInSameFolder", mPutRepliesInSameFolder);
    if (mHideInSelectionDialog) {
        configGroup.writeEntry("HideInSelectionDialog", mHideInSelectionDialog);
    } else {
        configGroup.deleteEntry("HideInSelectionDialog");
    }

    if (!mShortcut.isEmpty()) {
        configGroup.writeEntry("Shortcut", mShortcut.toString());
    } else {
        configGroup.deleteEntry("Shortcut");
    }

    if (mFormatMessage != MessageViewer::Viewer::Unknown) {
        if (mFormatMessage == MessageViewer::Viewer::UseGlobalSetting) {
            configGroup.deleteEntry("displayFormatOverride");
        } else {
            configGroup.writeEntry("displayFormatOverride", static_cast<int>(mFormatMessage));
        }
    }
}

void FolderSettings::setShortcut(const QKeySequence &sc)
{
    if (mShortcut != sc) {
        mShortcut = sc;
    }
}

const QKeySequence &FolderSettings::shortcut() const
{
    return mShortcut;
}

void FolderSettings::setUseDefaultIdentity(bool useDefaultIdentity)
{
    if (mUseDefaultIdentity != useDefaultIdentity) {
        mUseDefaultIdentity = useDefaultIdentity;
        if (mUseDefaultIdentity) {
            mIdentity = KernelIf->identityManager()->defaultIdentity().uoid();
        }
        KernelIf->syncConfig();
    }
}

bool FolderSettings::useDefaultIdentity() const
{
    return mUseDefaultIdentity;
}

void FolderSettings::setIdentity(uint identity)
{
    if (mIdentity != identity) {
        mIdentity = identity;
        KernelIf->syncConfig();
    }
}

uint FolderSettings::fallBackIdentity() const
{
    Q_ASSERT_X(!mCollection.resource().isEmpty(), "FolderSettings::fallBackIdentity", "No resource found in collection");
    int identityId = -1;
    MailCommon::ResourceReadConfigFile resourceFile(mCollection.resource());
    KConfigGroup grp = resourceFile.group(QStringLiteral("cache"));
    if (grp.isValid()) {
        const bool useDefault = grp.readEntry(QStringLiteral("UseDefaultIdentity"), true);
        if (useDefault) {
            return mIdentity;
        }
        const int remoteAccountIdent = grp.readEntry(QStringLiteral("AccountIdentity"), -1);
        if (remoteAccountIdent > 0) {
            identityId = remoteAccountIdent;
        }
    }
    if (identityId != -1
        && !KernelIf->identityManager()->identityForUoid(identityId).isNull()) {
        return identityId;
    }
    return mIdentity;
}

uint FolderSettings::identity() const
{
    if (mUseDefaultIdentity) {
        return fallBackIdentity();
    }
    return mIdentity;
}

QString FolderSettings::mailingListPostAddress() const
{
    if (mMailingList.features() & MailingList::Post) {
        QList<QUrl> post = mMailingList.postUrls();
        QList<QUrl>::const_iterator end(post.constEnd());
        for (QList<QUrl>::const_iterator it = post.constBegin(); it != end; ++it) {
            // We check for isEmpty because before 3.3 postAddress was just an
            // email@kde.org and that leaves protocol() field in the qurl class
            const QString protocol = (*it).scheme();
            if (protocol == QLatin1String("mailto") || protocol.isEmpty()) {
                return (*it).path();
            }
        }
    }
    return QString();
}

void FolderSettings::setMailingListEnabled(bool enabled)
{
    if (mMailingListEnabled != enabled) {
        mMailingListEnabled = enabled;
        writeConfig();
    }
}

bool FolderSettings::isMailingListEnabled() const
{
    return mMailingListEnabled;
}

void FolderSettings::setMailingList(const MailingList &mlist)
{
    if (mMailingList == mlist) {
        return;
    }

    mMailingList = mlist;
    writeConfig();
}

MessageCore::MailingList FolderSettings::mailingList() const
{
    return mMailingList;
}

bool FolderSettings::putRepliesInSameFolder() const
{
    return mPutRepliesInSameFolder;
}

void FolderSettings::setPutRepliesInSameFolder(bool b)
{
    mPutRepliesInSameFolder = b;
}

bool FolderSettings::hideInSelectionDialog() const
{
    return mHideInSelectionDialog;
}

void FolderSettings::setHideInSelectionDialog(bool hide)
{
    mHideInSelectionDialog = hide;
}
}
