/*
 * Copyright (C) by Daniel Molkentin <danimo@owncloud.com>
 *
 * 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 of the License, or
 * (at your option) any later version.
 *
 * 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.
 */


#include "accountsettings.h"
#include "ui_accountsettings.h"

#include "theme.h"
#include "folderman.h"
#include "folderwizard.h"
#include "folderstatusmodel.h"
#include "folderstatusdelegate.h"
#include "common/utility.h"
#include "application.h"
#include "configfile.h"
#include "account.h"
#include "accountstate.h"
#include "quotainfo.h"
#include "accountmanager.h"
#include "owncloudsetupwizard.h"
#include "creds/abstractcredentials.h"
#include "creds/httpcredentialsgui.h"
#include "tooltipupdater.h"
#include "filesystem.h"
#include "clientsideencryptionjobs.h"
#include "syncresult.h"
#include "ignorelisttablewidget.h"

#include <math.h>

#include <QDesktopServices>
#include <QDialogButtonBox>
#include <QDir>
#include <QListWidgetItem>
#include <QMessageBox>
#include <QAction>
#include <QVBoxLayout>
#include <QTreeView>
#include <QKeySequence>
#include <QIcon>
#include <QVariant>
#include <QJsonDocument>
#include <QToolTip>
#include <qstringlistmodel.h>
#include <qpropertyanimation.h>

#include "account.h"

namespace OCC {

Q_LOGGING_CATEGORY(lcAccountSettings, "nextcloud.gui.account.settings", QtInfoMsg)

static const char progressBarStyleC[] =
    "QProgressBar {"
    "border: 1px solid grey;"
    "border-radius: 5px;"
    "text-align: center;"
    "}"
    "QProgressBar::chunk {"
    "background-color: %1; width: 1px;"
    "}";

/**
 * Adjusts the mouse cursor based on the region it is on over the folder tree view.
 *
 * Used to show that one can click the red error list box by changing the cursor
 * to the pointing hand.
 */
class MouseCursorChanger : public QObject
{
    Q_OBJECT
public:
    MouseCursorChanger(QObject *parent)
        : QObject(parent)
    {
    }

    QTreeView *folderList;
    FolderStatusModel *model;

protected:
    bool eventFilter(QObject *watched, QEvent *event) override
    {
        if (event->type() == QEvent::HoverMove) {
            Qt::CursorShape shape = Qt::ArrowCursor;
            auto pos = folderList->mapFromGlobal(QCursor::pos());
            auto index = folderList->indexAt(pos);
            if (model->classify(index) == FolderStatusModel::RootFolder
                && (FolderStatusDelegate::errorsListRect(folderList->visualRect(index)).contains(pos)
                    || FolderStatusDelegate::optionsButtonRect(folderList->visualRect(index),folderList->layoutDirection()).contains(pos))) {
                shape = Qt::PointingHandCursor;
            }
            folderList->setCursor(shape);
        }
        return QObject::eventFilter(watched, event);
    }
};

AccountSettings::AccountSettings(AccountState *accountState, QWidget *parent)
    : QWidget(parent)
    , _ui(new Ui::AccountSettings)
    , _wasDisabledBefore(false)
    , _accountState(accountState)
    , _quotaInfo(accountState)
    , _menuShown(false)
{
    _ui->setupUi(this);

    _model = new FolderStatusModel;
    _model->setAccountState(_accountState);
    _model->setParent(this);
    FolderStatusDelegate *delegate = new FolderStatusDelegate;
    delegate->setParent(this);

    // Connect styleChanged events to our widgets, so they can adapt (Dark-/Light-Mode switching)
    connect(this, &AccountSettings::styleChanged, delegate, &FolderStatusDelegate::slotStyleChanged);

    _ui->_folderList->header()->hide();
    _ui->_folderList->setItemDelegate(delegate);
    _ui->_folderList->setModel(_model);
#if defined(Q_OS_MAC)
    _ui->_folderList->setMinimumWidth(400);
#else
    _ui->_folderList->setMinimumWidth(300);
#endif
    new ToolTipUpdater(_ui->_folderList);

    auto mouseCursorChanger = new MouseCursorChanger(this);
    mouseCursorChanger->folderList = _ui->_folderList;
    mouseCursorChanger->model = _model;
    _ui->_folderList->setMouseTracking(true);
    _ui->_folderList->setAttribute(Qt::WA_Hover, true);
    _ui->_folderList->installEventFilter(mouseCursorChanger);

    createAccountToolbox();
    connect(AccountManager::instance(), &AccountManager::accountAdded,
        this, &AccountSettings::slotAccountAdded);
    connect(this, &AccountSettings::removeAccountFolders,
            AccountManager::instance(), &AccountManager::removeAccountFolders);
    connect(_ui->_folderList, &QWidget::customContextMenuRequested,
        this, &AccountSettings::slotCustomContextMenuRequested);
    connect(_ui->_folderList, &QAbstractItemView::clicked,
        this, &AccountSettings::slotFolderListClicked);
    connect(_ui->_folderList, &QTreeView::expanded, this, &AccountSettings::refreshSelectiveSyncStatus);
    connect(_ui->_folderList, &QTreeView::collapsed, this, &AccountSettings::refreshSelectiveSyncStatus);
    connect(_ui->selectiveSyncNotification, &QLabel::linkActivated,
        this, &AccountSettings::slotLinkActivated);
    connect(_model, &FolderStatusModel::suggestExpand, _ui->_folderList, &QTreeView::expand);
    connect(_model, &FolderStatusModel::dirtyChanged, this, &AccountSettings::refreshSelectiveSyncStatus);
    refreshSelectiveSyncStatus();
    connect(_model, &QAbstractItemModel::rowsInserted,
        this, &AccountSettings::refreshSelectiveSyncStatus);

    QAction *syncNowAction = new QAction(this);
    syncNowAction->setShortcut(QKeySequence(Qt::Key_F6));
    connect(syncNowAction, &QAction::triggered, this, &AccountSettings::slotScheduleCurrentFolder);
    addAction(syncNowAction);

    QAction *syncNowWithRemoteDiscovery = new QAction(this);
    syncNowWithRemoteDiscovery->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_F6));
    connect(syncNowWithRemoteDiscovery, &QAction::triggered, this, &AccountSettings::slotScheduleCurrentFolderForceRemoteDiscovery);
    addAction(syncNowWithRemoteDiscovery);


    connect(_ui->selectiveSyncApply, &QAbstractButton::clicked, _model, &FolderStatusModel::slotApplySelectiveSync);
    connect(_ui->selectiveSyncCancel, &QAbstractButton::clicked, _model, &FolderStatusModel::resetFolders);
    connect(_ui->bigFolderApply, &QAbstractButton::clicked, _model, &FolderStatusModel::slotApplySelectiveSync);
    connect(_ui->bigFolderSyncAll, &QAbstractButton::clicked, _model, &FolderStatusModel::slotSyncAllPendingBigFolders);
    connect(_ui->bigFolderSyncNone, &QAbstractButton::clicked, _model, &FolderStatusModel::slotSyncNoPendingBigFolders);

    connect(FolderMan::instance(), &FolderMan::folderListChanged, _model, &FolderStatusModel::resetFolders);
    connect(this, &AccountSettings::folderChanged, _model, &FolderStatusModel::resetFolders);


    // quotaProgressBar style now set in customizeStyle()
    /*QColor color = palette().highlight().color();
     _ui->quotaProgressBar->setStyleSheet(QString::fromLatin1(progressBarStyleC).arg(color.name()));*/

    _ui->connectLabel->setText(tr("No account configured."));

    connect(_accountState, &AccountState::stateChanged, this, &AccountSettings::slotAccountStateChanged);
    slotAccountStateChanged();

    connect(&_quotaInfo, &QuotaInfo::quotaUpdated,
        this, &AccountSettings::slotUpdateQuota);

    // Connect E2E stuff
    connect(this, &AccountSettings::requesetMnemonic, _accountState->account()->e2e(), &ClientSideEncryption::slotRequestMnemonic);
    connect(_accountState->account()->e2e(), &ClientSideEncryption::showMnemonic, this, &AccountSettings::slotShowMnemonic);

    connect(_accountState->account()->e2e(), &ClientSideEncryption::mnemonicGenerated, this, &AccountSettings::slotNewMnemonicGenerated);
    if (_accountState->account()->e2e()->newMnemonicGenerated())
    {
        slotNewMnemonicGenerated();
    } else {
        _ui->encryptionMessage->hide();
    }

    customizeStyle();
}


void AccountSettings::createAccountToolbox()
{
    QMenu *menu = new QMenu();

    connect(menu, &QMenu::aboutToShow, this, &AccountSettings::slotMenuBeforeShow);

    _addAccountAction = new QAction(tr("Add new"), this);
    menu->addAction(_addAccountAction);
    connect(_addAccountAction, &QAction::triggered, this, &AccountSettings::slotOpenAccountWizard);

    _toggleSignInOutAction = new QAction(tr("Log out"), this);
    connect(_toggleSignInOutAction, &QAction::triggered, this, &AccountSettings::slotToggleSignInState);
    menu->addAction(_toggleSignInOutAction);

    QAction *action = new QAction(tr("Remove"), this);
    menu->addAction(action);
    connect(action, &QAction::triggered, this, &AccountSettings::slotDeleteAccount);

    _ui->_accountToolbox->setText(tr("Account") + QLatin1Char(' '));
    _ui->_accountToolbox->setMenu(menu);
    _ui->_accountToolbox->setPopupMode(QToolButton::InstantPopup);

    slotAccountAdded(_accountState);
}


void AccountSettings::slotNewMnemonicGenerated()
{
    _ui->encryptionMessage->setText(tr("This account supports end-to-end encryption"));

    QAction *mnemonic = new QAction(tr("Enable encryption"), this);
    connect(mnemonic, &QAction::triggered, this, &AccountSettings::requesetMnemonic);
    connect(mnemonic, &QAction::triggered, _ui->encryptionMessage, &KMessageWidget::hide);

    _ui->encryptionMessage->addAction(mnemonic);
    _ui->encryptionMessage->show();
}

void AccountSettings::slotMenuBeforeShow() {
    if (_menuShown) {
        return;
    }

    auto menu = _ui->_accountToolbox->menu();

    // We can't check this during the initial creation as there is no account yet then
    if (_accountState->account()->capabilities().clientSideEncryptionAvaliable()) {
        QAction *mnemonic = new QAction(tr("Show E2E mnemonic"), this);
        connect(mnemonic, &QAction::triggered, this, &AccountSettings::requesetMnemonic);
        menu->addAction(mnemonic);
    }

    _menuShown = true;
}


QString AccountSettings::selectedFolderAlias() const
{
    QModelIndex selected = _ui->_folderList->selectionModel()->currentIndex();
    if (!selected.isValid())
        return "";
    return _model->data(selected, FolderStatusDelegate::FolderAliasRole).toString();
}

void AccountSettings::slotOpenAccountWizard()
{
    // We can't call isSystemTrayAvailable with appmenu-qt5 because it breaks the systemtray
    // (issue #4693, #4944)
    if (qgetenv("QT_QPA_PLATFORMTHEME") == "appmenu-qt5" || QSystemTrayIcon::isSystemTrayAvailable()) {
        topLevelWidget()->close();
    }

    OwncloudSetupWizard::runWizard(qApp, SLOT(slotownCloudWizardDone(int)), nullptr);
}

void AccountSettings::slotToggleSignInState()
{
    if (_accountState->isSignedOut()) {
        _accountState->account()->resetRejectedCertificates();
        _accountState->signIn();
    } else {
        _accountState->signOutByUi();
    }
}

void AccountSettings::doExpand()
{
    _ui->_folderList->expandToDepth(0);
}

void AccountSettings::slotShowMnemonic(const QString &mnemonic) {
    AccountManager::instance()->displayMnemonic(mnemonic);
}

void AccountSettings::slotEncryptionFlagSuccess(const QByteArray& fileId)
{
    if (auto info = _model->infoForFileId(fileId)) {
      accountsState()->account()->e2e()->setFolderEncryptedStatus(info->_path, true);
    } else {
      qCInfo(lcAccountSettings()) << "Could not get information from the current folder.";
    }
    auto lockJob = new LockEncryptFolderApiJob(accountsState()->account(), fileId);
    connect(lockJob, &LockEncryptFolderApiJob::success,
            this, &AccountSettings::slotLockForEncryptionSuccess);
    connect(lockJob, &LockEncryptFolderApiJob::error,
            this, &AccountSettings::slotLockForEncryptionError);
    lockJob->start();
}

void AccountSettings::slotEncryptionFlagError(const QByteArray& fileId, int httpErrorCode)
{
    Q_UNUSED(fileId);
    Q_UNUSED(httpErrorCode);
    qDebug() << "Error on the encryption flag";
}

void AccountSettings::slotLockForEncryptionSuccess(const QByteArray& fileId, const QByteArray &token)
{
        accountsState()->account()->e2e()->setTokenForFolder(fileId, token);

        FolderMetadata emptyMetadata(accountsState()->account());
    auto encryptedMetadata = emptyMetadata.encryptedMetadata();
    if (encryptedMetadata.isEmpty()) {
      //TODO: Mark the folder as unencrypted as the metadata generation failed.
      QMessageBox::warning(nullptr, "Warning",
          "Could not generate the metadata for encryption, Unlocking the folder. \n"
          "This can be an issue with your OpenSSL libraries, please note that OpenSSL 1.1 is \n"
          "not compatible with Nextcloud yet."
      );
      return;
    }
    auto storeMetadataJob = new StoreMetaDataApiJob(accountsState()->account(), fileId, emptyMetadata.encryptedMetadata());
        connect(storeMetadataJob, &StoreMetaDataApiJob::success,
                        this, &AccountSettings::slotUploadMetadataSuccess);
        connect(storeMetadataJob, &StoreMetaDataApiJob::error,
                        this, &AccountSettings::slotUpdateMetadataError);

        storeMetadataJob->start();
}

void AccountSettings::slotUploadMetadataSuccess(const QByteArray& folderId)
{
    const auto token = accountsState()->account()->e2e()->tokenForFolder(folderId);
    auto unlockJob = new UnlockEncryptFolderApiJob(accountsState()->account(), folderId, token);
    connect(unlockJob, &UnlockEncryptFolderApiJob::success,
                    this, &AccountSettings::slotUnlockFolderSuccess);
    connect(unlockJob, &UnlockEncryptFolderApiJob::error,
                    this, &AccountSettings::slotUnlockFolderError);
    unlockJob->start();
}

void AccountSettings::slotUpdateMetadataError(const QByteArray& folderId, int httpReturnCode)
{
    Q_UNUSED(httpReturnCode);

    const auto token = accountsState()->account()->e2e()->tokenForFolder(folderId);
    auto unlockJob = new UnlockEncryptFolderApiJob(accountsState()->account(), folderId, token);
    connect(unlockJob, &UnlockEncryptFolderApiJob::success,
                    this, &AccountSettings::slotUnlockFolderSuccess);
    connect(unlockJob, &UnlockEncryptFolderApiJob::error,
                    this, &AccountSettings::slotUnlockFolderError);
    unlockJob->start();
}

void AccountSettings::slotLockForEncryptionError(const QByteArray& fileId, int httpErrorCode)
{
    Q_UNUSED(fileId);
    Q_UNUSED(httpErrorCode);

    qCInfo(lcAccountSettings()) << "Locking error" << httpErrorCode;
}

void AccountSettings::slotUnlockFolderError(const QByteArray& fileId, int httpErrorCode)
{
    Q_UNUSED(fileId);
    Q_UNUSED(httpErrorCode);

    qCInfo(lcAccountSettings()) << "Unlocking error!";
}
void AccountSettings::slotUnlockFolderSuccess(const QByteArray& fileId)
{
    Q_UNUSED(fileId);

    qCInfo(lcAccountSettings()) << "Unlocking success!";
}

bool AccountSettings::canEncryptOrDecrypt (const FolderStatusModel::SubFolderInfo* info) {
    if (info->_folder->syncResult().status() != SyncResult::Status::Success) {
        QMessageBox msgBox;
        msgBox.setText("Please wait for the folder to sync before trying to encrypt it.");
        msgBox.exec();
        return false;
    }

    // for some reason the actual folder in disk is info->_folder->path + info->_path.
    QDir folderPath(info->_folder->path() + info->_path);
    folderPath.setFilter( QDir::AllEntries | QDir::NoDotAndDotDot );

    if (folderPath.count() != 0) {
        QMessageBox msgBox;
        msgBox.setText("You cannot encyrpt a folder with contents, please remove the files \n"
                       "Wait for the new sync, then encrypt it.");
        msgBox.exec();
        return false;
    }
    return true;
}

void AccountSettings::slotMarkSubfolderEncrypted(const FolderStatusModel::SubFolderInfo* folderInfo)
{
    if (!canEncryptOrDecrypt(folderInfo)) {
        return;
    }

    auto job = new OCC::SetEncryptionFlagApiJob(accountsState()->account(),  folderInfo->_fileId);
    connect(job, &OCC::SetEncryptionFlagApiJob::success, this, &AccountSettings::slotEncryptionFlagSuccess);
    connect(job, &OCC::SetEncryptionFlagApiJob::error, this, &AccountSettings::slotEncryptionFlagError);
    job->start();
}


// Order:
// 1 - Lock folder,
// 2 - Delete Metadata,
// 3 - Unlock Folder,
// 4 - Mark as Decrypted.


void AccountSettings::slotMarkSubfolderDecrypted(const FolderStatusModel::SubFolderInfo* folderInfo)
{
    if (!canEncryptOrDecrypt(folderInfo)) {
        return;
    }

  qDebug() << "Starting to mark as decrypted";
  qDebug() << "Locking the folder";
  auto lockJob = new LockEncryptFolderApiJob(accountsState()->account(), folderInfo->_fileId);
  connect(lockJob, &LockEncryptFolderApiJob::success,
          this, &AccountSettings::slotLockForDecryptionSuccess);
  connect(lockJob, &LockEncryptFolderApiJob::error,
          this, &AccountSettings::slotLockForDecryptionError);
  lockJob->start();
}

void AccountSettings::slotLockForDecryptionSuccess(const QByteArray& fileId, const QByteArray& token)
{
  qDebug() << "Locking success, trying to delete the metadata";
  accountsState()->account()->e2e()->setTokenForFolder(fileId, token);
  auto job = new DeleteMetadataApiJob(accountsState()->account(), fileId);
  connect(job, &DeleteMetadataApiJob::success,
          this, &AccountSettings::slotDeleteMetadataSuccess);
  connect(job, &DeleteMetadataApiJob::error,
          this, &AccountSettings::slotDeleteMetadataError);
  job->start();
}

void AccountSettings::slotDeleteMetadataSuccess(const QByteArray& fileId)
{
  qDebug() << "Metadata successfully deleted, unlocking the folder";
  auto token = accountsState()->account()->e2e()->tokenForFolder(fileId);
  auto job = new UnlockEncryptFolderApiJob(accountsState()->account(), fileId, token);
  connect(job, &UnlockEncryptFolderApiJob::success,
          this, &AccountSettings::slotUnlockForDecryptionSuccess);
  connect(job, &UnlockEncryptFolderApiJob::error,
          this, &AccountSettings::slotUnlockForDecryptionError);
  job->start();
}

void AccountSettings::slotUnlockForDecryptionSuccess(const QByteArray& fileId)
{
  qDebug() << "Unlocked the folder successfully, removing the encrypted bit.";
  auto job = new OCC::DeleteApiJob(accountsState()->account(),
      "ocs/v2.php/apps/end_to_end_encryption/api/v1/encrypted/" + QString(fileId));

  // This Delete ApiJob is different than all other jobs used here, sigh.
  connect(job, &OCC::DeleteApiJob::result, [this, &fileId](int httpResponse) {
      if (httpResponse == 200) {
          slotDecryptionFlagSuccess(fileId);
      } else {
          slotDecryptionFlagError(fileId, httpResponse);
      }
  });
  job->start();
}

void AccountSettings::slotDecryptionFlagSuccess(const QByteArray& fileId)
{
    if (auto info = _model->infoForFileId(fileId)) {
        accountsState()->account()->e2e()->setFolderEncryptedStatus(info->_path, false);
    } else {
        qCInfo(lcAccountSettings()) << "Could not get information for the current path.";
    }
}

void AccountSettings::slotDecryptionFlagError(const QByteArray& fileId, int httpReturnCode)
{
    Q_UNUSED(fileId);
    Q_UNUSED(httpReturnCode);

    qDebug() << "Error Setting the Decryption Flag";
}

void AccountSettings::slotUnlockForDecryptionError(const QByteArray& fileId, int httpReturnCode)
{
    Q_UNUSED(fileId);
    Q_UNUSED(httpReturnCode);

    qDebug() << "Error unlocking folder after decryption";
}

void AccountSettings::slotDeleteMetadataError(const QByteArray& fileId, int httpReturnCode)
{
    Q_UNUSED(fileId);
    Q_UNUSED(httpReturnCode);

    qDebug() << "Error deleting the metadata";
}
void AccountSettings::slotLockForDecryptionError(const QByteArray& fileId, int httpReturnCode)
{
    Q_UNUSED(fileId);
    Q_UNUSED(httpReturnCode);

    qDebug() << "Error Locking for decryption";
}

void AccountSettings::slotEditCurrentIgnoredFiles()
{
    Folder *f = FolderMan::instance()->folder(selectedFolderAlias());
    if (f == nullptr)
        return;
    openIgnoredFilesDialog(f->path());
}

void AccountSettings::slotEditCurrentLocalIgnoredFiles()
{
    QModelIndex selected = _ui->_folderList->selectionModel()->currentIndex();
    if (!selected.isValid() || _model->classify(selected) != FolderStatusModel::SubFolder)
        return;
    QString fileName = _model->data(selected, FolderStatusDelegate::FolderPathRole).toString();
    openIgnoredFilesDialog(fileName);
}

void AccountSettings::openIgnoredFilesDialog(const QString & absFolderPath)
{
    Q_ASSERT(absFolderPath.startsWith('/'));
    Q_ASSERT(absFolderPath.endsWith('/'));

    const QString ignoreFile = absFolderPath + ".sync-exclude.lst";
    auto layout = new QVBoxLayout();
    auto ignoreListWidget = new IgnoreListTableWidget(this);
    ignoreListWidget->readIgnoreFile(ignoreFile);
    layout->addWidget(ignoreListWidget);

    auto buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
    layout->addWidget(buttonBox);

    auto dialog = new QDialog();
    dialog->setLayout(layout);

    connect(buttonBox, &QDialogButtonBox::clicked, [=](QAbstractButton * button) {
        if (buttonBox->buttonRole(button) == QDialogButtonBox::AcceptRole)
            ignoreListWidget->slotWriteIgnoreFile(ignoreFile);
        dialog->close();
    });
    connect(buttonBox, &QDialogButtonBox::rejected,
            dialog,    &QDialog::close);

    dialog->open();
}

void AccountSettings::slotSubfolderContextMenuRequested(const QModelIndex& index, const QPoint& pos)
{
    Q_UNUSED(pos);

    QMenu menu;
    auto ac = menu.addAction(tr("Open folder"));
    connect(ac, &QAction::triggered, this, &AccountSettings::slotOpenCurrentLocalSubFolder);

    auto fileName = _model->data(index, FolderStatusDelegate::FolderPathRole).toString();
    if (!QFile::exists(fileName)) {
        ac->setEnabled(false);
    }
    auto info   = _model->infoForIndex(index);
    auto acc = _accountState->account();

    if (acc->capabilities().clientSideEncryptionAvaliable()) {
        // Verify if the folder is empty before attempting to encrypt.

        bool isEncrypted = acc->e2e()->isFolderEncrypted(info->_path);

        if (!isEncrypted) {
            ac = menu.addAction(tr("Encrypt"));
            connect(ac, &QAction::triggered, [this, &info] { slotMarkSubfolderEncrypted(info); });
        } else {
            // Ingore decrypting for now since it only works with an empty folder
            // connect(ac, &QAction::triggered, [this, &info] { slotMarkSubfolderDecrypted(info); });
        }
    }

    ac = menu.addAction(tr("Edit Ignored Files"));
    connect(ac, &QAction::triggered, this, &AccountSettings::slotEditCurrentLocalIgnoredFiles);

    menu.exec(QCursor::pos());
}

void AccountSettings::slotCustomContextMenuRequested(const QPoint &pos)
{
    QTreeView *tv = _ui->_folderList;
    QModelIndex index = tv->indexAt(pos);
    if (!index.isValid()) {
        return;
    }

    if (_model->classify(index) == FolderStatusModel::SubFolder) {
        slotSubfolderContextMenuRequested(index, pos);
        return;
    }

    if (_model->classify(index) != FolderStatusModel::RootFolder) {
        return;
    }

    tv->setCurrentIndex(index);
    QString alias = _model->data(index, FolderStatusDelegate::FolderAliasRole).toString();
    bool folderPaused = _model->data(index, FolderStatusDelegate::FolderSyncPaused).toBool();
    bool folderConnected = _model->data(index, FolderStatusDelegate::FolderAccountConnected).toBool();
    auto folderMan = FolderMan::instance();

    QMenu *menu = new QMenu(tv);

    menu->setAttribute(Qt::WA_DeleteOnClose);

    QAction *ac = menu->addAction(tr("Open folder"));
    connect(ac, &QAction::triggered, this, &AccountSettings::slotOpenCurrentFolder);

    ac = menu->addAction(tr("Edit Ignored Files"));
    connect(ac, &QAction::triggered, this, &AccountSettings::slotEditCurrentIgnoredFiles);

    if (!_ui->_folderList->isExpanded(index)) {
        ac = menu->addAction(tr("Choose what to sync"));
        ac->setEnabled(folderConnected);
        connect(ac, &QAction::triggered, this, &AccountSettings::doExpand);
    }

    if (!folderPaused) {
        ac = menu->addAction(tr("Force sync now"));
        if (folderMan->currentSyncFolder() == folderMan->folder(alias)) {
            ac->setText(tr("Restart sync"));
        }
        ac->setEnabled(folderConnected);
        connect(ac, &QAction::triggered, this, &AccountSettings::slotForceSyncCurrentFolder);
    }

    ac = menu->addAction(folderPaused ? tr("Resume sync") : tr("Pause sync"));
    connect(ac, &QAction::triggered, this, &AccountSettings::slotEnableCurrentFolder);

    ac = menu->addAction(tr("Remove folder sync connection"));
    connect(ac, &QAction::triggered, this, &AccountSettings::slotRemoveCurrentFolder);
    menu->popup(tv->mapToGlobal(pos));
}

void AccountSettings::slotFolderListClicked(const QModelIndex &indx)
{
    if (indx.data(FolderStatusDelegate::AddButton).toBool()) {
        // "Add Folder Sync Connection"
        if (indx.flags() & Qt::ItemIsEnabled) {
            slotAddFolder();
        } else {
            QToolTip::showText(
                QCursor::pos(),
                _model->data(indx, Qt::ToolTipRole).toString(),
                this);
        }
        return;
    }
    if (_model->classify(indx) == FolderStatusModel::RootFolder) {
        // tries to find if we clicked on the '...' button.
        QTreeView *tv = _ui->_folderList;
        auto pos = tv->mapFromGlobal(QCursor::pos());
        if (FolderStatusDelegate::optionsButtonRect(tv->visualRect(indx), layoutDirection()).contains(pos)) {
            slotCustomContextMenuRequested(pos);
            return;
        }
        if (FolderStatusDelegate::errorsListRect(tv->visualRect(indx)).contains(pos)) {
            emit showIssuesList(_accountState);
            return;
        }

        // Expand root items on single click
        if (_accountState && _accountState->state() == AccountState::Connected) {
            bool expanded = !(_ui->_folderList->isExpanded(indx));
            _ui->_folderList->setExpanded(indx, expanded);
        }
    }
}

void AccountSettings::slotAddFolder()
{
    FolderMan *folderMan = FolderMan::instance();
    folderMan->setSyncEnabled(false); // do not start more syncs.

    FolderWizard *folderWizard = new FolderWizard(_accountState->account(), this);

    connect(folderWizard, &QDialog::accepted, this, &AccountSettings::slotFolderWizardAccepted);
    connect(folderWizard, &QDialog::rejected, this, &AccountSettings::slotFolderWizardRejected);
    folderWizard->open();
}


void AccountSettings::slotFolderWizardAccepted()
{
    FolderWizard *folderWizard = qobject_cast<FolderWizard *>(sender());
    FolderMan *folderMan = FolderMan::instance();

    qCInfo(lcAccountSettings) << "Folder wizard completed";

    FolderDefinition definition;
    definition.localPath = FolderDefinition::prepareLocalPath(
        folderWizard->field(QLatin1String("sourceFolder")).toString());
    definition.targetPath = FolderDefinition::prepareTargetPath(
        folderWizard->property("targetPath").toString());

    {
        QDir dir(definition.localPath);
        if (!dir.exists()) {
            qCInfo(lcAccountSettings) << "Creating folder" << definition.localPath;
            if (!dir.mkpath(".")) {
                QMessageBox::warning(this, tr("Folder creation failed"),
                    tr("<p>Could not create local folder <i>%1</i>.</p>")
                        .arg(QDir::toNativeSeparators(definition.localPath)));
                return;
            }
        }
        FileSystem::setFolderMinimumPermissions(definition.localPath);
        Utility::setupFavLink(definition.localPath);
    }

    /* take the value from the definition of already existing folders. All folders have
     * the same setting so far.
     * The default is to sync hidden files
     */
    definition.ignoreHiddenFiles = folderMan->ignoreHiddenFiles();

    if (folderMan->navigationPaneHelper().showInExplorerNavigationPane())
        definition.navigationPaneClsid = QUuid::createUuid();

    auto selectiveSyncBlackList = folderWizard->property("selectiveSyncBlackList").toStringList();

    folderMan->setSyncEnabled(true);

    Folder *f = folderMan->addFolder(_accountState, definition);
    if (f) {
        f->journalDb()->setSelectiveSyncList(SyncJournalDb::SelectiveSyncBlackList, selectiveSyncBlackList);

        // The user already accepted the selective sync dialog. everything is in the white list
        f->journalDb()->setSelectiveSyncList(SyncJournalDb::SelectiveSyncWhiteList,
            QStringList() << QLatin1String("/"));
        folderMan->scheduleAllFolders();
        emit folderChanged();
    }
}

void AccountSettings::slotFolderWizardRejected()
{
    qCInfo(lcAccountSettings) << "Folder wizard cancelled";
    FolderMan *folderMan = FolderMan::instance();
    folderMan->setSyncEnabled(true);
}

void AccountSettings::slotRemoveCurrentFolder()
{
    FolderMan *folderMan = FolderMan::instance();
    auto folder = folderMan->folder(selectedFolderAlias());
    QModelIndex selected = _ui->_folderList->selectionModel()->currentIndex();
    if (selected.isValid() && folder) {
        int row = selected.row();

        qCInfo(lcAccountSettings) << "Remove Folder alias " << folder->alias();
        QString shortGuiLocalPath = folder->shortGuiLocalPath();

        QMessageBox messageBox(QMessageBox::Question,
            tr("Confirm Folder Sync Connection Removal"),
            tr("<p>Do you really want to stop syncing the folder <i>%1</i>?</p>"
               "<p><b>Note:</b> This will <b>not</b> delete any files.</p>")
                .arg(shortGuiLocalPath),
            QMessageBox::NoButton,
            this);
        QPushButton *yesButton =
            messageBox.addButton(tr("Remove Folder Sync Connection"), QMessageBox::YesRole);
        messageBox.addButton(tr("Cancel"), QMessageBox::NoRole);

        messageBox.exec();
        if (messageBox.clickedButton() != yesButton) {
            return;
        }

        folderMan->removeFolder(folder);
        _model->removeRow(row);

        // single folder fix to show add-button and hide remove-button

        emit folderChanged();
    }
}

void AccountSettings::slotOpenCurrentFolder()
{
    auto alias = selectedFolderAlias();
    if (!alias.isEmpty()) {
        emit openFolderAlias(alias);
    }
}

void AccountSettings::slotOpenCurrentLocalSubFolder()
{
    QModelIndex selected = _ui->_folderList->selectionModel()->currentIndex();
    if (!selected.isValid() || _model->classify(selected) != FolderStatusModel::SubFolder)
        return;
    QString fileName = _model->data(selected, FolderStatusDelegate::FolderPathRole).toString();
    QUrl url = QUrl::fromLocalFile(fileName);
    QDesktopServices::openUrl(url);
}

void AccountSettings::showConnectionLabel(const QString &message, QStringList errors)
{
    const QString errStyle = QLatin1String("color:#ffffff; background-color:#bb4d4d;padding:5px;"
                                           "border-width: 1px; border-style: solid; border-color: #aaaaaa;"
                                           "border-radius:5px;");
    if (errors.isEmpty()) {
        QString msg = message;
        Theme::replaceLinkColorStringBackgroundAware(msg);
        _ui->connectLabel->setText(msg);
        _ui->connectLabel->setToolTip(QString());
        _ui->connectLabel->setStyleSheet(QString());
    } else {
        errors.prepend(message);
        QString msg = errors.join(QLatin1String("\n"));
        qCDebug(lcAccountSettings) << msg;
        Theme::replaceLinkColorString(msg, QColor("#c1c8e6"));
        _ui->connectLabel->setText(msg);
        _ui->connectLabel->setToolTip(QString());
        _ui->connectLabel->setStyleSheet(errStyle);
    }
    _ui->accountStatus->setVisible(!message.isEmpty());
}

void AccountSettings::slotEnableCurrentFolder()
{
    auto alias = selectedFolderAlias();

    if (!alias.isEmpty()) {
        FolderMan *folderMan = FolderMan::instance();

        qCInfo(lcAccountSettings) << "Application: enable folder with alias " << alias;
        bool terminate = false;
        bool currentlyPaused = false;

        // this sets the folder status to disabled but does not interrupt it.
        Folder *f = folderMan->folder(alias);
        if (!f) {
            return;
        }
        currentlyPaused = f->syncPaused();
        if (!currentlyPaused) {
            // check if a sync is still running and if so, ask if we should terminate.
            if (f->isBusy()) { // its still running
#if defined(Q_OS_MAC)
                QWidget *parent = this;
                Qt::WindowFlags flags = Qt::Sheet;
#else
                QWidget *parent = nullptr;
                Qt::WindowFlags flags = Qt::Dialog | Qt::MSWindowsFixedSizeDialogHint; // default flags
#endif
                QMessageBox msgbox(QMessageBox::Question, tr("Sync Running"),
                    tr("The syncing operation is running.<br/>Do you want to terminate it?"),
                    QMessageBox::Yes | QMessageBox::No, parent, flags);
                msgbox.setDefaultButton(QMessageBox::Yes);
                int reply = msgbox.exec();
                if (reply == QMessageBox::Yes)
                    terminate = true;
                else
                    return; // do nothing
            }
        }

        // message box can return at any time while the thread keeps running,
        // so better check again after the user has responded.
        if (f->isBusy() && terminate) {
            f->slotTerminateSync();
        }
        f->setSyncPaused(!currentlyPaused);

        // keep state for the icon setting.
        if (currentlyPaused)
            _wasDisabledBefore = true;

        _model->slotUpdateFolderState(f);
    }
}

void AccountSettings::slotScheduleCurrentFolder()
{
    FolderMan *folderMan = FolderMan::instance();
    if (auto folder = folderMan->folder(selectedFolderAlias())) {
        folderMan->scheduleFolder(folder);
    }
}

void AccountSettings::slotScheduleCurrentFolderForceRemoteDiscovery()
{
    FolderMan *folderMan = FolderMan::instance();
    if (auto folder = folderMan->folder(selectedFolderAlias())) {
        folder->journalDb()->forceRemoteDiscoveryNextSync();
        folderMan->scheduleFolder(folder);
    }
}

void AccountSettings::slotForceSyncCurrentFolder()
{
    FolderMan *folderMan = FolderMan::instance();
    if (auto selectedFolder = folderMan->folder(selectedFolderAlias())) {
        // Terminate and reschedule any running sync
        if (Folder *current = folderMan->currentSyncFolder()) {
            folderMan->terminateSyncProcess();
            folderMan->scheduleFolder(current);
        }

        // Insert the selected folder at the front of the queue
        folderMan->scheduleFolderNext(selectedFolder);
    }
}

void AccountSettings::slotOpenOC()
{
    if (_OCUrl.isValid())
        QDesktopServices::openUrl(_OCUrl);
}

void AccountSettings::slotUpdateQuota(qint64 total, qint64 used)
{
    if (total > 0) {
        _ui->quotaProgressBar->setVisible(true);
        _ui->quotaProgressBar->setEnabled(true);
        // workaround the label only accepting ints (which may be only 32 bit wide)
        const double percent = used / (double)total * 100;
        const int percentInt = qMin(qRound(percent), 100);
        _ui->quotaProgressBar->setValue(percentInt);
        QString usedStr = Utility::octetsToString(used);
        QString totalStr = Utility::octetsToString(total);
        QString percentStr = Utility::compactFormatDouble(percent, 1);
        QString toolTip = tr("%1 (%3%) of %2 in use. Some folders, including network mounted or shared folders, might have different limits.").arg(usedStr, totalStr, percentStr);
        _ui->quotaInfoLabel->setText(tr("%1 of %2 in use").arg(usedStr, totalStr));
        _ui->quotaInfoLabel->setToolTip(toolTip);
        _ui->quotaProgressBar->setToolTip(toolTip);
    } else {
        _ui->quotaProgressBar->setVisible(false);
        _ui->quotaInfoLabel->setToolTip(QString());

        /* -1 means not computed; -2 means unknown; -3 means unlimited  (#3940)*/
        if (total == 0 || total == -1) {
            _ui->quotaInfoLabel->setText(tr("Currently there is no storage usage information available."));
        } else {
            QString usedStr = Utility::octetsToString(used);
            _ui->quotaInfoLabel->setText(tr("%1 in use").arg(usedStr));
        }
    }
}

void AccountSettings::slotAccountStateChanged()
{
    int state = _accountState ? _accountState->state() : AccountState::Disconnected;
    if (_accountState) {
        _ui->sslButton->updateAccountState(_accountState);
        AccountPtr account = _accountState->account();
        QUrl safeUrl(account->url());
        safeUrl.setPassword(QString()); // Remove the password from the URL to avoid showing it in the UI
        FolderMan *folderMan = FolderMan::instance();
        foreach (Folder *folder, folderMan->map().values()) {
            _model->slotUpdateFolderState(folder);
        }

        QString server = QString::fromLatin1("<a href=\"%1\">%2</a>")
                             .arg(Utility::escape(account->url().toString()),
                                 Utility::escape(safeUrl.toString()));
        QString serverWithUser = server;
        if (AbstractCredentials *cred = account->credentials()) {
            QString user = account->davDisplayName();
            if (user.isEmpty()) {
                user = cred->user();
            }
            serverWithUser = tr("%1 as <i>%2</i>").arg(server, Utility::escape(user));
        }

        if (state == AccountState::Connected) {
            QStringList errors;
            if (account->serverVersionUnsupported()) {
                errors << tr("The server version %1 is old and unsupported! Proceed at your own risk.").arg(account->serverVersion());
            }
            showConnectionLabel(tr("Connected to %1.").arg(serverWithUser), errors);
        } else if (state == AccountState::ServiceUnavailable) {
            showConnectionLabel(tr("Server %1 is temporarily unavailable.").arg(server));
        } else if (state == AccountState::MaintenanceMode) {
            showConnectionLabel(tr("Server %1 is currently in maintenance mode.").arg(server));
        } else if (state == AccountState::SignedOut) {
            showConnectionLabel(tr("Signed out from %1.").arg(serverWithUser));
        } else if (state == AccountState::AskingCredentials) {
            QUrl url;
            if (auto cred = qobject_cast<HttpCredentialsGui *>(account->credentials())) {
                connect(cred, &HttpCredentialsGui::authorisationLinkChanged,
                    this, &AccountSettings::slotAccountStateChanged, Qt::UniqueConnection);
                url = cred->authorisationLink();
            }
            if (url.isValid()) {
                showConnectionLabel(tr("Obtaining authorization from the browser. "
                                       "<a href='%1'>Click here</a> to re-open the browser.")
                                        .arg(url.toString(QUrl::FullyEncoded)));
            } else {
                showConnectionLabel(tr("Connecting to %1 …").arg(serverWithUser));
            }
        } else {
            showConnectionLabel(tr("No connection to %1 at %2.")
                                    .arg(Utility::escape(Theme::instance()->appNameGUI()), server),
                _accountState->connectionErrors());
        }
    } else {
        // ownCloud is not yet configured.
        showConnectionLabel(tr("No %1 connection configured.")
                                .arg(Utility::escape(Theme::instance()->appNameGUI())));
    }

    /* Allow to expand the item if the account is connected. */
    _ui->_folderList->setItemsExpandable(state == AccountState::Connected);

    if (state != AccountState::Connected) {
        /* check if there are expanded root items, if so, close them */
        int i;
        for (i = 0; i < _model->rowCount(); ++i) {
            if (_ui->_folderList->isExpanded(_model->index(i)))
                _ui->_folderList->setExpanded(_model->index(i), false);
        }
    } else if (_model->isDirty()) {
        // If we connect and have pending changes, show the list.
        doExpand();
    }

    // Disabling expansion of folders might require hiding the selective
    // sync user interface buttons.
    refreshSelectiveSyncStatus();

    /* set the correct label for the Account toolbox button */
    if (_accountState) {
        if (_accountState->isSignedOut()) {
            _toggleSignInOutAction->setText(tr("Log in"));
        } else {
            _toggleSignInOutAction->setText(tr("Log out"));
        }
    }

    if (state == AccountState::State::Connected) {
        /* TODO: We should probably do something better here.
         * Verify if the user has a private key already uploaded to the server,
         * if it has, do not offer to create one.
         */
        qCInfo(lcAccountSettings) << "Accout" << accountsState()->account()->displayName()
            << "Client Side Encryption" << accountsState()->account()->capabilities().clientSideEncryptionAvaliable();
    }
}

void AccountSettings::slotLinkActivated(const QString &link)
{
    // Parse folder alias and filename from the link, calculate the index
    // and select it if it exists.
    const QStringList li = link.split(QLatin1String("?folder="));
    if (li.count() > 1) {
        QString myFolder = li[0];
        const QString alias = li[1];
        if (myFolder.endsWith(QLatin1Char('/')))
            myFolder.chop(1);

        // Make sure the folder itself is expanded
        Folder *f = FolderMan::instance()->folder(alias);
        QModelIndex folderIndx = _model->indexForPath(f, QString());
        if (!_ui->_folderList->isExpanded(folderIndx)) {
            _ui->_folderList->setExpanded(folderIndx, true);
        }

        QModelIndex indx = _model->indexForPath(f, myFolder);
        if (indx.isValid()) {
            // make sure all the parents are expanded
            for (auto i = indx.parent(); i.isValid(); i = i.parent()) {
                if (!_ui->_folderList->isExpanded(i)) {
                    _ui->_folderList->setExpanded(i, true);
                }
            }
            _ui->_folderList->setSelectionMode(QAbstractItemView::SingleSelection);
            _ui->_folderList->setCurrentIndex(indx);
            _ui->_folderList->scrollTo(indx);
        } else {
            qCWarning(lcAccountSettings) << "Unable to find a valid index for " << myFolder;
        }
    }
}

AccountSettings::~AccountSettings()
{
    delete _ui;
}

void AccountSettings::refreshSelectiveSyncStatus()
{
    bool shouldBeVisible = _model->isDirty() && _accountState->isConnected();

    QString msg;
    int cnt = 0;
    foreach (Folder *folder, FolderMan::instance()->map().values()) {
        if (folder->accountState() != _accountState) {
            continue;
        }

        bool ok;
        auto undecidedList = folder->journalDb()->getSelectiveSyncList(SyncJournalDb::SelectiveSyncUndecidedList, &ok);
        QString p;
        foreach (const auto &it, undecidedList) {
            // FIXME: add the folder alias in a hoover hint.
            // folder->alias() + QLatin1String("/")
            if (cnt++) {
                msg += QLatin1String(", ");
            }
            QString myFolder = (it);
            if (myFolder.endsWith('/')) {
                myFolder.chop(1);
            }
            QModelIndex theIndx = _model->indexForPath(folder, myFolder);
            if (theIndx.isValid()) {
                msg += QString::fromLatin1("<a href=\"%1?folder=%2\">%1</a>")
                           .arg(Utility::escape(myFolder), Utility::escape(folder->alias()));
            } else {
                msg += myFolder; // no link because we do not know the index yet.
            }
        }
    }

    if (msg.isEmpty()) {
        _ui->selectiveSyncButtons->setVisible(true);
        _ui->bigFolderUi->setVisible(false);
    } else {
        ConfigFile cfg;
        QString info = !cfg.confirmExternalStorage()
            ? tr("There are folders that were not synchronized because they are too big: ")
            : !cfg.newBigFolderSizeLimit().first
                ? tr("There are folders that were not synchronized because they are external storages: ")
                : tr("There are folders that were not synchronized because they are too big or external storages: ");

        _ui->selectiveSyncNotification->setText(info + msg);
        _ui->selectiveSyncButtons->setVisible(false);
        _ui->bigFolderUi->setVisible(true);
        shouldBeVisible = true;
    }

    _ui->selectiveSyncApply->setEnabled(_model->isDirty() || !msg.isEmpty());
    bool wasVisible = !_ui->selectiveSyncStatus->isHidden();
    if (wasVisible != shouldBeVisible) {
        QSize hint = _ui->selectiveSyncStatus->sizeHint();
        if (shouldBeVisible) {
            _ui->selectiveSyncStatus->setMaximumHeight(0);
            _ui->selectiveSyncStatus->setVisible(true);
        }
        auto anim = new QPropertyAnimation(_ui->selectiveSyncStatus, "maximumHeight", _ui->selectiveSyncStatus);
        anim->setEndValue(shouldBeVisible ? hint.height() : 0);
        anim->start(QAbstractAnimation::DeleteWhenStopped);
        connect(anim, &QPropertyAnimation::finished, [this, shouldBeVisible]() {
            _ui->selectiveSyncStatus->setMaximumHeight(QWIDGETSIZE_MAX);
            if (!shouldBeVisible) {
                _ui->selectiveSyncStatus->hide();
            }
        });
    }
}

void AccountSettings::slotAccountAdded(AccountState *)
{
    // if the theme is limited to single account, the button must hide if
    // there is already one account.
    int s = AccountManager::instance()->accounts().size();
    if (s > 0 && !Theme::instance()->multiAccount()) {
        _addAccountAction->setVisible(false);
    } else {
        _addAccountAction->setVisible(true);
    }
}

void AccountSettings::slotDeleteAccount()
{
    // Deleting the account potentially deletes 'this', so
    // the QMessageBox should be destroyed before that happens.
    {
        QMessageBox messageBox(QMessageBox::Question,
            tr("Confirm Account Removal"),
            tr("<p>Do you really want to remove the connection to the account <i>%1</i>?</p>"
               "<p><b>Note:</b> This will <b>not</b> delete any files.</p>")
                .arg(_accountState->account()->displayName()),
            QMessageBox::NoButton,
            this);
        QPushButton *yesButton =
            messageBox.addButton(tr("Remove connection"), QMessageBox::YesRole);
        messageBox.addButton(tr("Cancel"), QMessageBox::NoRole);

        messageBox.exec();
        if (messageBox.clickedButton() != yesButton) {
            return;
        }
    }

    // Else it might access during destruction. This should be better handled by it having a QSharedPointer
    _model->setAccountState(nullptr);

    auto manager = AccountManager::instance();
    manager->deleteAccount(_accountState);
    manager->save();

    // IMPORTANT: "this" is deleted from this point on. We should probably remove this synchronous
    // .exec() QMessageBox magic above as it recurses into the event loop.
}

bool AccountSettings::event(QEvent *e)
{
    if (e->type() == QEvent::Hide || e->type() == QEvent::Show) {
        _quotaInfo.setActive(isVisible());
    }
    if (e->type() == QEvent::Show) {
        // Expand the folder automatically only if there's only one, see #4283
        // The 2 is 1 folder + 1 'add folder' button
        if (_model->rowCount() <= 2) {
            _ui->_folderList->setExpanded(_model->index(0, 0), true);
        }
    }
    return QWidget::event(e);
}

void AccountSettings::slotStyleChanged()
{
    customizeStyle();

    // Notify the other widgets (Dark-/Light-Mode switching)
    emit styleChanged();
}

void AccountSettings::customizeStyle()
{
    QString msg = _ui->connectLabel->text();
    Theme::replaceLinkColorStringBackgroundAware(msg);
    _ui->connectLabel->setText(msg);

    QColor color = palette().highlight().color();
    _ui->quotaProgressBar->setStyleSheet(QString::fromLatin1(progressBarStyleC).arg(color.name()));
}

} // namespace OCC

#include "accountsettings.moc"
