ChatPage.cpp

/*
 * nheko Copyright (C) 2017  Konstantinos Sideris <siderisk@auth.gr>
 *
 * 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 3 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.
 *
 * 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 <QApplication>
#include <QImageReader>
#include <QInputDialog>
#include <QMessageBox>
#include <QSettings>
#include <QShortcut>

#include <mtx/responses.hpp>

#include "AvatarProvider.h"
#include "Cache.h"
#include "Cache_p.h"
#include "CallManager.h"
#include "ChatPage.h"
#include "DeviceVerificationFlow.h"
#include "EventAccessors.h"
#include "Logging.h"
#include "MainWindow.h"
#include "MatrixClient.h"
#include "Olm.h"
#include "QuickSwitcher.h"
#include "RoomList.h"
#include "SideBarActions.h"
#include "Splitter.h"
#include "UserInfoWidget.h"
#include "UserSettingsPage.h"
#include "Utils.h"
#include "ui/OverlayModal.h"
#include "ui/Theme.h"

#include "notifications/Manager.h"

#include "dialogs/ReadReceipts.h"
#include "popups/UserMentions.h"
#include "timeline/TimelineViewManager.h"

#include "blurhash.hpp"

// TODO: Needs to be updated with an actual secret.
static const std::string STORAGE_SECRET_KEY("secret");

ChatPage *ChatPage::instance_             = nullptr;
constexpr int CHECK_CONNECTIVITY_INTERVAL = 15'000;
constexpr int RETRY_TIMEOUT               = 5'000;
constexpr size_t MAX_ONETIME_KEYS         = 50;

Q_DECLARE_METATYPE(std::optional<mtx::crypto::EncryptedFile>)
Q_DECLARE_METATYPE(std::optional<RelatedInfo>)
Q_DECLARE_METATYPE(mtx::presence::PresenceState)
Q_DECLARE_METATYPE(mtx::secret_storage::AesHmacSha2KeyDescription)
Q_DECLARE_METATYPE(SecretsToDecrypt)

ChatPage::ChatPage(QSharedPointer<UserSettings> userSettings, QWidget *parent)
  : QWidget(parent)
  , isConnected_(true)
  , userSettings_{userSettings}
  , notificationsManager(this)
  , callManager_(new CallManager(this))
{
        setObjectName("chatPage");

        instance_ = this;

        qRegisterMetaType<std::optional<mtx::crypto::EncryptedFile>>();
        qRegisterMetaType<std::optional<RelatedInfo>>();
        qRegisterMetaType<mtx::presence::PresenceState>();
        qRegisterMetaType<mtx::secret_storage::AesHmacSha2KeyDescription>();
        qRegisterMetaType<SecretsToDecrypt>();

        topLayout_ = new QHBoxLayout(this);
        topLayout_->setSpacing(0);
        topLayout_->setMargin(0);

        communitiesList_ = new CommunitiesList(this);
        topLayout_->addWidget(communitiesList_);

        splitter = new Splitter(this);
        splitter->setHandleWidth(0);

        topLayout_->addWidget(splitter);

        // SideBar
        sideBar_ = new QFrame(this);
        sideBar_->setObjectName("sideBar");
        sideBar_->setMinimumWidth(::splitter::calculateSidebarSizes(QFont{}).normal);
        sideBarLayout_ = new QVBoxLayout(sideBar_);
        sideBarLayout_->setSpacing(0);
        sideBarLayout_->setMargin(0);

        sideBarTopWidget_ = new QWidget(sideBar_);
        sidebarActions_   = new SideBarActions(this);
        connect(
          sidebarActions_, &SideBarActions::showSettings, this, &ChatPage::showUserSettingsPage);
        connect(sidebarActions_, &SideBarActions::joinRoom, this, &ChatPage::joinRoom);
        connect(sidebarActions_, &SideBarActions::createRoom, this, &ChatPage::createRoom);

        user_info_widget_    = new UserInfoWidget(sideBar_);
        user_mentions_popup_ = new popups::UserMentions();
        room_list_           = new RoomList(userSettings, sideBar_);
        connect(room_list_, &RoomList::joinRoom, this, &ChatPage::joinRoom);

        sideBarLayout_->addWidget(user_info_widget_);
        sideBarLayout_->addWidget(room_list_);
        sideBarLayout_->addWidget(sidebarActions_);

        sideBarTopWidgetLayout_ = new QVBoxLayout(sideBarTopWidget_);
        sideBarTopWidgetLayout_->setSpacing(0);
        sideBarTopWidgetLayout_->setMargin(0);

        // Content
        content_ = new QFrame(this);
        content_->setObjectName("mainContent");
        contentLayout_ = new QVBoxLayout(content_);
        contentLayout_->setSpacing(0);
        contentLayout_->setMargin(0);

        view_manager_ = new TimelineViewManager(callManager_, this);

        contentLayout_->addWidget(view_manager_->getWidget());

        // Splitter
        splitter->addWidget(sideBar_);
        splitter->addWidget(content_);
        splitter->restoreSizes(parent->width());

        connect(this,
                &ChatPage::downloadedSecrets,
                this,
                &ChatPage::decryptDownloadedSecrets,
                Qt::QueuedConnection);

        connect(this, &ChatPage::connectionLost, this, [this]() {
                nhlog::net()->info("connectivity lost");
                isConnected_ = false;
                http::client()->shutdown();
        });
        connect(this, &ChatPage::connectionRestored, this, [this]() {
                nhlog::net()->info("trying to re-connect");
                isConnected_ = true;

                // Drop all pending connections.
                http::client()->shutdown();
                trySync();
        });

        connect(
          new QShortcut(QKeySequence("Ctrl+Down"), this), &QShortcut::activated, this, [this]() {
                  if (isVisible())
                          room_list_->nextRoom();
          });
        connect(
          new QShortcut(QKeySequence("Ctrl+Up"), this), &QShortcut::activated, this, [this]() {
                  if (isVisible())
                          room_list_->previousRoom();
          });

        connectivityTimer_.setInterval(CHECK_CONNECTIVITY_INTERVAL);
        connect(&connectivityTimer_, &QTimer::timeout, this, [=]() {
                if (http::client()->access_token().empty()) {
                        connectivityTimer_.stop();
                        return;
                }

                http::client()->versions(
                  [this](const mtx::responses::Versions &, mtx::http::RequestErr err) {
                          if (err) {
                                  emit connectionLost();
                                  return;
                          }

                          if (!isConnected_)
                                  emit connectionRestored();
                  });
        });

        connect(this, &ChatPage::loggedOut, this, &ChatPage::logout);

        connect(
          view_manager_, &TimelineViewManager::showRoomList, splitter, &Splitter::showFullRoomList);
        connect(view_manager_, &TimelineViewManager::inviteUsers, this, [this](QStringList users) {
                const auto room_id = current_room_.toStdString();

                for (int ii = 0; ii < users.size(); ++ii) {
                        QTimer::singleShot(ii * 500, this, [this, room_id, ii, users]() {
                                const auto user = users.at(ii);

                                http::client()->invite_user(
                                  room_id,
                                  user.toStdString(),
                                  [this, user](const mtx::responses::RoomInvite &,
                                               mtx::http::RequestErr err) {
                                          if (err) {
                                                  emit showNotification(
                                                    tr("Failed to invite user: %1").arg(user));
                                                  return;
                                          }

                                          emit showNotification(tr("Invited user: %1").arg(user));
                                  });
                        });
                }
        });

        connect(room_list_, &RoomList::roomChanged, this, [this](QString room_id) {
                this->current_room_ = room_id;
        });
        connect(room_list_, &RoomList::roomChanged, splitter, &Splitter::showChatView);
        connect(
          room_list_, &RoomList::roomChanged, view_manager_, &TimelineViewManager::setHistoryView);

        connect(room_list_, &RoomList::acceptInvite, this, [this](const QString &room_id) {
                joinRoom(room_id);
                room_list_->removeRoom(room_id, currentRoom() == room_id);
        });

        connect(room_list_, &RoomList::declineInvite, this, [this](const QString &room_id) {
                leaveRoom(room_id);
                room_list_->removeRoom(room_id, currentRoom() == room_id);
        });

        connect(view_manager_,
                &TimelineViewManager::updateRoomsLastMessage,
                room_list_,
                &RoomList::updateRoomDescription);

        connect(room_list_,
                SIGNAL(totalUnreadMessageCountUpdated(int)),
                this,
                SIGNAL(unreadMessages(int)));

        connect(
          this, &ChatPage::updateGroupsInfo, communitiesList_, &CommunitiesList::setCommunities);

        connect(this, &ChatPage::leftRoom, this, &ChatPage::removeRoom);
        connect(this, &ChatPage::notificationsRetrieved, this, &ChatPage::sendNotifications);
        connect(this,
                &ChatPage::highlightedNotifsRetrieved,
                this,
                [](const mtx::responses::Notifications &notif) {
                        try {
                                cache::saveTimelineMentions(notif);
                        } catch (const lmdb::error &e) {
                                nhlog::db()->error("failed to save mentions: {}", e.what());
                        }
                });

        connect(communitiesList_,
                &CommunitiesList::communityChanged,
                this,
                [this](const QString &groupId) {
                        current_community_ = groupId;

                        if (groupId == "world")
                                room_list_->removeFilter();
                        else
                                room_list_->applyFilter(communitiesList_->roomList(groupId));
                });

        connect(&notificationsManager,
                &NotificationsManager::notificationClicked,
                this,
                [this](const QString &roomid, const QString &eventid) {
                        Q_UNUSED(eventid)
                        room_list_->highlightSelectedRoom(roomid);
                        activateWindow();
                });
        connect(&notificationsManager,
                &NotificationsManager::sendNotificationReply,
                this,
                [this](const QString &roomid, const QString &eventid, const QString &body) {
                        view_manager_->queueReply(roomid, eventid, body);
                        room_list_->highlightSelectedRoom(roomid);
                        activateWindow();
                });

        setGroupViewState(userSettings_->groupView());

        connect(userSettings_.data(),
                &UserSettings::groupViewStateChanged,
                this,
                &ChatPage::setGroupViewState);

        connect(this, &ChatPage::initializeRoomList, room_list_, &RoomList::initialize);
        connect(
          this,
          &ChatPage::initializeViews,
          view_manager_,
          [this](const mtx::responses::Rooms &rooms) { view_manager_->sync(rooms); },
          Qt::QueuedConnection);
        connect(this,
                &ChatPage::initializeEmptyViews,
                view_manager_,
                &TimelineViewManager::initWithMessages);
        connect(this,
                &ChatPage::initializeMentions,
                user_mentions_popup_,
                &popups::UserMentions::initializeMentions);
        connect(this, &ChatPage::syncUI, this, [this](const mtx::responses::Rooms &rooms) {
                try {
                        room_list_->cleanupInvites(cache::invites());
                } catch (const lmdb::error &e) {
                        nhlog::db()->error("failed to retrieve invites: {}", e.what());
                }

                view_manager_->sync(rooms);
                removeLeftRooms(rooms.leave);

                bool hasNotifications = false;
                for (const auto &room : rooms.join) {
                        auto room_id = QString::fromStdString(room.first);
                        updateRoomNotificationCount(
                          room_id,
                          room.second.unread_notifications.notification_count,
                          room.second.unread_notifications.highlight_count);

                        if (room.second.unread_notifications.notification_count > 0)
                                hasNotifications = true;
                }

                if (hasNotifications && userSettings_->hasNotifications())
                        http::client()->notifications(
                          5,
                          "",
                          "",
                          [this](const mtx::responses::Notifications &res,
                                 mtx::http::RequestErr err) {
                                  if (err) {
                                          nhlog::net()->warn(
                                            "failed to retrieve notifications: {} ({})",
                                            err->matrix_error.error,
                                            static_cast<int>(err->status_code));
                                          return;
                                  }

                                  emit notificationsRetrieved(std::move(res));
                          });
        });
        connect(this, &ChatPage::syncRoomlist, room_list_, &RoomList::sync);
        connect(this, &ChatPage::syncTags, communitiesList_, &CommunitiesList::syncTags);

        // Callbacks to update the user info (top left corner of the page).
        connect(this, &ChatPage::setUserAvatar, user_info_widget_, &UserInfoWidget::setAvatar);
        connect(this, &ChatPage::setUserDisplayName, this, [this](const QString &name) {
                auto userid = utils::localUser();
                user_info_widget_->setUserId(userid);
                user_info_widget_->setDisplayName(name);
        });

        connect(
          this, &ChatPage::tryInitialSyncCb, this, &ChatPage::tryInitialSync, Qt::QueuedConnection);
        connect(this, &ChatPage::trySyncCb, this, &ChatPage::trySync, Qt::QueuedConnection);
        connect(
          this,
          &ChatPage::tryDelayedSyncCb,
          this,
          [this]() { QTimer::singleShot(RETRY_TIMEOUT, this, &ChatPage::trySync); },
          Qt::QueuedConnection);

        connect(this,
                &ChatPage::newSyncResponse,
                this,
                &ChatPage::handleSyncResponse,
                Qt::QueuedConnection);

        connect(this, &ChatPage::dropToLoginPageCb, this, &ChatPage::dropToLoginPage);

        connectCallMessage<mtx::events::msg::CallInvite>();
        connectCallMessage<mtx::events::msg::CallCandidates>();
        connectCallMessage<mtx::events::msg::CallAnswer>();
        connectCallMessage<mtx::events::msg::CallHangUp>();
}

void
ChatPage::logout()
{
        resetUI();
        deleteConfigs();

        emit closing();
        connectivityTimer_.stop();
}

void
ChatPage::dropToLoginPage(const QString &msg)
{
        nhlog::ui()->info("dropping to the login page: {}", msg.toStdString());

        http::client()->shutdown();
        connectivityTimer_.stop();

        resetUI();
        deleteConfigs();

        emit showLoginPage(msg);
}

void
ChatPage::resetUI()
{
        room_list_->clear();
        user_info_widget_->reset();
        view_manager_->clearAll();

        emit unreadMessages(0);
}

void
ChatPage::deleteConfigs()
{
        QSettings settings;
        settings.beginGroup("auth");
        settings.remove("");
        settings.endGroup();
        settings.beginGroup("client");
        settings.remove("");
        settings.endGroup();
        settings.beginGroup("notifications");
        settings.remove("");
        settings.endGroup();

        http::client()->shutdown();
        cache::deleteData();
}

void
ChatPage::bootstrap(QString userid, QString homeserver, QString token)
{
        using namespace mtx::identifiers;

        try {
                http::client()->set_user(parse<User>(userid.toStdString()));
        } catch (const std::invalid_argument &) {
                nhlog::ui()->critical("bootstrapped with invalid user_id: {}",
                                      userid.toStdString());
        }

        http::client()->set_server(homeserver.toStdString());
        http::client()->set_access_token(token.toStdString());

        // The Olm client needs the user_id & device_id that will be included
        // in the generated payloads & keys.
        olm::client()->set_user_id(http::client()->user_id().to_string());
        olm::client()->set_device_id(http::client()->device_id());

        try {
                cache::init(userid);

                connect(cache::client(),
                        &Cache::newReadReceipts,
                        view_manager_,
                        &TimelineViewManager::updateReadReceipts);

                connect(
                  cache::client(), &Cache::roomReadStatus, room_list_, &RoomList::updateReadStatus);

                connect(cache::client(),
                        &Cache::removeNotification,
                        &notificationsManager,
                        &NotificationsManager::removeNotification);

                const bool isInitialized = cache::isInitialized();
                const auto cacheVersion  = cache::formatVersion();

                callManager_->refreshTurnServer();

                if (!isInitialized) {
                        cache::setCurrentFormat();
                } else {
                        if (cacheVersion == cache::CacheVersion::Current) {
                                loadStateFromCache();
                                return;
                        } else if (cacheVersion == cache::CacheVersion::Older) {
                                if (!cache::runMigrations()) {
                                        QMessageBox::critical(
                                          this,
                                          tr("Cache migration failed!"),
                                          tr("Migrating the cache to the current version failed. "
                                             "This can have different reasons. Please open an "
                                             "issue and try to use an older version in the mean "
                                             "time. Alternatively you can try deleting the cache "
                                             "manually."));
                                        QCoreApplication::quit();
                                }
                                loadStateFromCache();
                                return;
                        } else if (cacheVersion == cache::CacheVersion::Newer) {
                                QMessageBox::critical(
                                  this,
                                  tr("Incompatible cache version"),
                                  tr("The cache on your disk is newer than this version of Nheko "
                                     "supports. Please update or clear your cache."));
                                QCoreApplication::quit();
                                return;
                        }
                }

        } catch (const lmdb::error &e) {
                nhlog::db()->critical("failure during boot: {}", e.what());
                cache::deleteData();
                nhlog::net()->info("falling back to initial sync");
        }

        try {
                // It's the first time syncing with this device
                // There isn't a saved olm account to restore.
                nhlog::crypto()->info("creating new olm account");
                olm::client()->create_new_account();
                cache::saveOlmAccount(olm::client()->save(STORAGE_SECRET_KEY));
        } catch (const lmdb::error &e) {
                nhlog::crypto()->critical("failed to save olm account {}", e.what());
                emit dropToLoginPageCb(QString::fromStdString(e.what()));
                return;
        } catch (const mtx::crypto::olm_exception &e) {
                nhlog::crypto()->critical("failed to create new olm account {}", e.what());
                emit dropToLoginPageCb(QString::fromStdString(e.what()));
                return;
        }

        getProfileInfo();
        tryInitialSync();
}

void
ChatPage::loadStateFromCache()
{
        nhlog::db()->info("restoring state from cache");

        try {
                olm::client()->load(cache::restoreOlmAccount(), STORAGE_SECRET_KEY);

                emit initializeEmptyViews(cache::client()->roomIds());
                emit initializeRoomList(cache::roomInfo());
                emit initializeMentions(cache::getTimelineMentions());
                emit syncTags(cache::roomInfo().toStdMap());

                cache::calculateRoomReadStatus();

        } catch (const mtx::crypto::olm_exception &e) {
                nhlog::crypto()->critical("failed to restore olm account: {}", e.what());
                emit dropToLoginPageCb(tr("Failed to restore OLM account. Please login again."));
                return;
        } catch (const lmdb::error &e) {
                nhlog::db()->critical("failed to restore cache: {}", e.what());
                emit dropToLoginPageCb(tr("Failed to restore save data. Please login again."));
                return;
        } catch (const json::exception &e) {
                nhlog::db()->critical("failed to parse cache data: {}", e.what());
                return;
        }

        nhlog::crypto()->info("ed25519   : {}", olm::client()->identity_keys().ed25519);
        nhlog::crypto()->info("curve25519: {}", olm::client()->identity_keys().curve25519);

        getProfileInfo();

        emit contentLoaded();

        // Start receiving events.
        emit trySyncCb();
}

void
ChatPage::showQuickSwitcher()
{
        auto dialog = new QuickSwitcher(this);

        connect(dialog, &QuickSwitcher::roomSelected, room_list_, &RoomList::highlightSelectedRoom);
        connect(
          dialog, &QuickSwitcher::closing, this, []() { MainWindow::instance()->hideOverlay(); });

        MainWindow::instance()->showTransparentOverlayModal(dialog);
}

void
ChatPage::removeRoom(const QString &room_id)
{
        try {
                cache::removeRoom(room_id);
                cache::removeInvite(room_id.toStdString());
        } catch (const lmdb::error &e) {
                nhlog::db()->critical("failure while removing room: {}", e.what());
                // TODO: Notify the user.
        }

        room_list_->removeRoom(room_id, room_id == current_room_);
}

void
ChatPage::removeLeftRooms(const std::map<std::string, mtx::responses::LeftRoom> &rooms)
{
        for (auto it = rooms.cbegin(); it != rooms.cend(); ++it) {
                const auto room_id = QString::fromStdString(it->first);
                room_list_->removeRoom(room_id, room_id == current_room_);
        }
}

void
ChatPage::setGroupViewState(bool isEnabled)
{
        if (!isEnabled) {
                communitiesList_->communityChanged("world");
                communitiesList_->hide();

                return;
        }

        communitiesList_->show();
}

void
ChatPage::updateRoomNotificationCount(const QString &room_id,
                                      uint16_t notification_count,
                                      uint16_t highlight_count)
{
        room_list_->updateUnreadMessageCount(room_id, notification_count, highlight_count);
}

void
ChatPage::sendNotifications(const mtx::responses::Notifications &res)
{
        for (const auto &item : res.notifications) {
                const auto event_id = mtx::accessors::event_id(item.event);

                try {
                        if (item.read) {
                                cache::removeReadNotification(event_id);
                                continue;
                        }

                        if (!cache::isNotificationSent(event_id)) {
                                const auto room_id = QString::fromStdString(item.room_id);
                                const auto user_id =
                                  QString::fromStdString(mtx::accessors::sender(item.event));

                                // We should only sent one notification per event.
                                cache::markSentNotification(event_id);

                                // Don't send a notification when the current room is opened.
                                if (isRoomActive(room_id))
                                        continue;

                                if (userSettings_->hasAlertOnNotification()) {
                                        QApplication::alert(this);
                                }

                                if (userSettings_->hasDesktopNotifications()) {
                                        auto info = cache::singleRoomInfo(item.room_id);

                                        AvatarProvider::resolve(
                                          QString::fromStdString(info.avatar_url),
                                          96,
                                          this,
                                          [this, room_id, event_id, item, user_id, info](
                                            QPixmap image) {
                                                  notificationsManager.postNotification(
                                                    room_id,
                                                    QString::fromStdString(event_id),
                                                    QString::fromStdString(info.name),
                                                    cache::displayName(room_id, user_id),
                                                    utils::event_body(item.event),
                                                    image.toImage());
                                          });
                                }
                        }
                } catch (const lmdb::error &e) {
                        nhlog::db()->warn("error while sending notification: {}", e.what());
                }
        }
}

void
ChatPage::showNotificationsDialog(const QPoint &widgetPos)
{
        auto notifDialog = user_mentions_popup_;

        notifDialog->setGeometry(
          widgetPos.x() - (width() / 10), widgetPos.y() + 25, width() / 5, height() / 2);

        notifDialog->raise();
        notifDialog->showPopup();
}

void
ChatPage::tryInitialSync()
{
        nhlog::crypto()->info("ed25519   : {}", olm::client()->identity_keys().ed25519);
        nhlog::crypto()->info("curve25519: {}", olm::client()->identity_keys().curve25519);

        // Upload one time keys for the device.
        nhlog::crypto()->info("generating one time keys");
        olm::client()->generate_one_time_keys(MAX_ONETIME_KEYS);

        http::client()->upload_keys(
          olm::client()->create_upload_keys_request(),
          [this](const mtx::responses::UploadKeys &res, mtx::http::RequestErr err) {
                  if (err) {
                          const int status_code = static_cast<int>(err->status_code);

                          if (status_code == 404) {
                                  nhlog::net()->warn(
                                    "skipping key uploading. server doesn't provide /keys/upload");
                                  return startInitialSync();
                          }

                          nhlog::crypto()->critical("failed to upload one time keys: {} {}",
                                                    err->matrix_error.error,
                                                    status_code);

                          QString errorMsg(tr("Failed to setup encryption keys. Server response: "
                                              "%1 %2. Please try again later.")
                                             .arg(QString::fromStdString(err->matrix_error.error))
                                             .arg(status_code));

                          emit dropToLoginPageCb(errorMsg);
                          return;
                  }

                  olm::mark_keys_as_published();

                  for (const auto &entry : res.one_time_key_counts)
                          nhlog::net()->info(
                            "uploaded {} {} one-time keys", entry.second, entry.first);

                  startInitialSync();
          });
}

void
ChatPage::startInitialSync()
{
        nhlog::net()->info("trying initial sync");

        mtx::http::SyncOpts opts;
        opts.timeout      = 0;
        opts.set_presence = currentPresence();

        http::client()->sync(
          opts, [this](const mtx::responses::Sync &res, mtx::http::RequestErr err) {
                  // TODO: Initial Sync should include mentions as well...

                  if (err) {
                          const auto error      = QString::fromStdString(err->matrix_error.error);
                          const auto msg        = tr("Please try to login again: %1").arg(error);
                          const auto err_code   = mtx::errors::to_string(err->matrix_error.errcode);
                          const int status_code = static_cast<int>(err->status_code);

                          nhlog::net()->error("initial sync error: {} {}", status_code, err_code);

                          // non http related errors
                          if (status_code <= 0 || status_code >= 600) {
                                  startInitialSync();
                                  return;
                          }

                          switch (status_code) {
                          case 502:
                          case 504:
                          case 524: {
                                  startInitialSync();
                                  return;
                          }
                          default: {
                                  emit dropToLoginPageCb(msg);
                                  return;
                          }
                          }
                  }

                  nhlog::net()->info("initial sync completed");

                  try {
                          cache::client()->saveState(res);

                          olm::handle_to_device_messages(res.to_device.events);

                          emit initializeViews(std::move(res.rooms));
                          emit initializeRoomList(cache::roomInfo());
                          emit initializeMentions(cache::getTimelineMentions());

                          cache::calculateRoomReadStatus();
                          emit syncTags(cache::roomInfo().toStdMap());
                  } catch (const lmdb::error &e) {
                          nhlog::db()->error("failed to save state after initial sync: {}",
                                             e.what());
                          startInitialSync();
                          return;
                  }

                  emit trySyncCb();
                  emit contentLoaded();
          });
}

void
ChatPage::handleSyncResponse(const mtx::responses::Sync &res)
{
        nhlog::net()->debug("sync completed: {}", res.next_batch);

        // Ensure that we have enough one-time keys available.
        ensureOneTimeKeyCount(res.device_one_time_keys_count);

        // TODO: fine grained error handling
        try {
                cache::client()->saveState(res);
                olm::handle_to_device_messages(res.to_device.events);

                auto updates = cache::getRoomInfo(cache::client()->roomsWithStateUpdates(res));

                emit syncRoomlist(updates);

                emit syncUI(res.rooms);

                emit syncTags(cache::getRoomInfo(cache::client()->roomsWithTagUpdates(res)));

                // if we process a lot of syncs (1 every 200ms), this means we clean the
                // db every 100s
                static int syncCounter = 0;
                if (syncCounter++ >= 500) {
                        cache::deleteOldData();
                        syncCounter = 0;
                }
        } catch (const lmdb::map_full_error &e) {
                nhlog::db()->error("lmdb is full: {}", e.what());
                cache::deleteOldData();
        } catch (const lmdb::error &e) {
                nhlog::db()->error("saving sync response: {}", e.what());
        }

        emit trySyncCb();
}

void
ChatPage::trySync()
{
        mtx::http::SyncOpts opts;
        opts.set_presence = currentPresence();

        if (!connectivityTimer_.isActive())
                connectivityTimer_.start();

        try {
                opts.since = cache::nextBatchToken();
        } catch (const lmdb::error &e) {
                nhlog::db()->error("failed to retrieve next batch token: {}", e.what());
                return;
        }

        http::client()->sync(
          opts,
          [this, since = cache::nextBatchToken()](const mtx::responses::Sync &res,
                                                  mtx::http::RequestErr err) {
                  if (since != cache::nextBatchToken()) {
                          nhlog::net()->warn("Duplicate sync, dropping");
                          return;
                  }

                  if (err) {
                          const auto error      = QString::fromStdString(err->matrix_error.error);
                          const auto msg        = tr("Please try to login again: %1").arg(error);
                          const auto err_code   = mtx::errors::to_string(err->matrix_error.errcode);
                          const int status_code = static_cast<int>(err->status_code);

                          if ((http::is_logged_in() &&
                               (err->matrix_error.errcode ==
                                  mtx::errors::ErrorCode::M_UNKNOWN_TOKEN ||
                                err->matrix_error.errcode ==
                                  mtx::errors::ErrorCode::M_MISSING_TOKEN)) ||
                              !http::is_logged_in()) {
                                  emit dropToLoginPageCb(msg);
                                  return;
                          }

                          nhlog::net()->error("sync error: {} {}", status_code, err_code);
                          emit tryDelayedSyncCb();
                          return;
                  }

                  emit newSyncResponse(res);
          });
}

void
ChatPage::joinRoom(const QString &room)
{
        const auto room_id = room.toStdString();

        http::client()->join_room(
          room_id, [this, room_id](const mtx::responses::RoomId &, mtx::http::RequestErr err) {
                  if (err) {
                          emit showNotification(
                            tr("Failed to join room: %1")
                              .arg(QString::fromStdString(err->matrix_error.error)));
                          return;
                  }

                  emit tr("You joined the room");

                  // We remove any invites with the same room_id.
                  try {
                          cache::removeInvite(room_id);
                  } catch (const lmdb::error &e) {
                          emit showNotification(tr("Failed to remove invite: %1").arg(e.what()));
                  }
          });
}

void
ChatPage::createRoom(const mtx::requests::CreateRoom &req)
{
        http::client()->create_room(
          req, [this](const mtx::responses::CreateRoom &res, mtx::http::RequestErr err) {
                  if (err) {
                          const auto err_code   = mtx::errors::to_string(err->matrix_error.errcode);
                          const auto error      = err->matrix_error.error;
                          const int status_code = static_cast<int>(err->status_code);

                          nhlog::net()->warn(
                            "failed to create room: {} {} ({})", error, err_code, status_code);

                          emit showNotification(
                            tr("Room creation failed: %1").arg(QString::fromStdString(error)));
                          return;
                  }

                  emit showNotification(
                    tr("Room %1 created.").arg(QString::fromStdString(res.room_id.to_string())));
          });
}

void
ChatPage::leaveRoom(const QString &room_id)
{
        http::client()->leave_room(
          room_id.toStdString(),
          [this, room_id](const mtx::responses::Empty &, mtx::http::RequestErr err) {
                  if (err) {
                          emit showNotification(
                            tr("Failed to leave room: %1")
                              .arg(QString::fromStdString(err->matrix_error.error)));
                          return;
                  }

                  emit leftRoom(room_id);
          });
}

void
ChatPage::inviteUser(QString userid, QString reason)
{
        auto room = current_room_;

        if (QMessageBox::question(this,
                                  tr("Confirm invite"),
                                  tr("Do you really want to invite %1 (%2)?")
                                    .arg(cache::displayName(current_room_, userid))
                                    .arg(userid)) != QMessageBox::Yes)
                return;

        http::client()->invite_user(
          room.toStdString(),
          userid.toStdString(),
          [this, userid, room](const mtx::responses::Empty &, mtx::http::RequestErr err) {
                  if (err) {
                          emit showNotification(
                            tr("Failed to invite %1 to %2: %3")
                              .arg(userid)
                              .arg(room)
                              .arg(QString::fromStdString(err->matrix_error.error)));
                  } else
                          emit showNotification(tr("Invited user: %1").arg(userid));
          },
          reason.trimmed().toStdString());
}
void
ChatPage::kickUser(QString userid, QString reason)
{
        auto room = current_room_;

        if (QMessageBox::question(this,
                                  tr("Confirm kick"),
                                  tr("Do you really want to kick %1 (%2)?")
                                    .arg(cache::displayName(current_room_, userid))
                                    .arg(userid)) != QMessageBox::Yes)