ChatPage.cpp

// SPDX-FileCopyrightText: Nheko Contributors
//
// SPDX-License-Identifier: GPL-3.0-or-later

#include <QApplication>
#include <QInputDialog>
#include <QMessageBox>

#include <mtx/responses.hpp>

#include "AvatarProvider.h"
#include "Cache.h"
#include "Cache_p.h"
#include "ChatPage.h"
#include "EventAccessors.h"
#include "Logging.h"
#include "MainWindow.h"
#include "MatrixClient.h"
#include "UserSettingsPage.h"
#include "Utils.h"
#include "encryption/DeviceVerificationFlow.h"
#include "encryption/Olm.h"
#include "ui/RoomSummary.h"
#include "ui/Theme.h"
#include "ui/UserProfile.h"
#include "voip/CallManager.h"

#include "notifications/Manager.h"

#include "timeline/TimelineViewManager.h"

#include "blurhash.hpp"

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

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

    instance_ = this;

    view_manager_ = new TimelineViewManager(callManager_, this);

    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();
    });

    connectivityTimer_.setInterval(CHECK_CONNECTIVITY_INTERVAL);
    connect(&connectivityTimer_, &QTimer::timeout, this, [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;
              }

              // only update spaces every 20 minutes
              if (lastSpacesUpdate < QDateTime::currentDateTime().addSecs(-20 * 60)) {
                  lastSpacesUpdate = QDateTime::currentDateTime();
                  utils::updateSpaceVias();
                  utils::removeExpiredEvents();
              }

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

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

    connect(
      view_manager_,
      &TimelineViewManager::inviteUsers,
      this,
      [this](QString roomId, QStringList users) {
          for (int ii = 0; ii < users.size(); ++ii) {
              QTimer::singleShot(ii * 500, this, [this, roomId, ii, users]() {
                  const auto user = users.at(ii);

                  http::client()->invite_user(
                    roomId.toStdString(),
                    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(this,
            &ChatPage::internalKnock,
            this,
            qOverload<const QString &, const std::vector<std::string> &, QString, bool, bool>(
              &ChatPage::knockRoom),
            Qt::QueuedConnection);
    connect(this, &ChatPage::leftRoom, this, &ChatPage::removeRoom);
    connect(this, &ChatPage::changeToRoom, this, &ChatPage::changeRoom, Qt::QueuedConnection);
    connect(notificationsManager,
            &NotificationsManager::notificationClicked,
            this,
            [this](const QString &roomid, const QString &eventid) {
                Q_UNUSED(eventid)
                auto exWin = MainWindow::instance()->windowForRoom(roomid);
                if (exWin) {
                    exWin->setVisible(true);
                    exWin->raise();
                    exWin->requestActivate();
                } else {
                    view_manager_->rooms()->setCurrentRoom(roomid);
                    MainWindow::instance()->setVisible(true);
                    MainWindow::instance()->raise();
                    MainWindow::instance()->requestActivate();
                }
            });
    connect(notificationsManager,
            &NotificationsManager::sendNotificationReply,
            this,
            &ChatPage::sendNotificationReply);

    connect(
      this,
      &ChatPage::initializeViews,
      view_manager_,
      [this](const mtx::responses::Sync &sync) { view_manager_->sync(sync); },
      Qt::QueuedConnection);
    connect(this,
            &ChatPage::initializeEmptyViews,
            view_manager_,
            &TimelineViewManager::initializeRoomlist);
    connect(this, &ChatPage::syncUI, this, [this](const mtx::responses::Sync &sync) {
        view_manager_->sync(sync);

        static unsigned int prevNotificationCount = 0;
        unsigned int notificationCount            = 0;
        for (const auto &room : sync.rooms.join) {
            notificationCount +=
              static_cast<unsigned int>(room.second.unread_notifications.notification_count);
        }

        // HACK: If we had less notifications last time we checked, send an alert if the
        // user wanted one. Technically, this may cause an alert to be missed if new ones
        // come in while you are reading old ones. Since the window is almost certainly open
        // in this edge case, that's probably a non-issue.
        // TODO: Replace this once we have proper pushrules support. This is a horrible hack
        if (prevNotificationCount < notificationCount) {
            if (userSettings_->hasAlertOnNotification())
                MainWindow::instance()->alert(0);
        }
        prevNotificationCount = notificationCount;

        // No need to check amounts for this section, as this function internally checks for
        // duplicates.
        if (notificationCount && userSettings_->hasNotifications())
            for (const auto &e : sync.account_data.events) {
                if (auto newRules =
                      std::get_if<mtx::events::AccountDataEvent<mtx::pushrules::GlobalRuleset>>(&e))
                    pushrules =
                      std::make_unique<mtx::pushrules::PushRuleEvaluator>(newRules->content.global);
            }
        if (!pushrules) {
            auto eventInDb = cache::client()->getAccountData(mtx::events::EventType::PushRules);
            if (eventInDb) {
                if (auto newRules =
                      std::get_if<mtx::events::AccountDataEvent<mtx::pushrules::GlobalRuleset>>(
                        &*eventInDb))
                    pushrules =
                      std::make_unique<mtx::pushrules::PushRuleEvaluator>(newRules->content.global);
            }
        }
        if (pushrules) {
            const auto local_user = utils::localUser().toStdString();

            // Desktop notifications to be sent
            std::vector<std::tuple<QSharedPointer<TimelineModel>,
                                   mtx::events::collections::TimelineEvents,
                                   std::string,
                                   std::vector<mtx::pushrules::actions::Action>>>
              notifications;
            for (const auto &[room_id, room] : sync.rooms.join) {
                // clear old notifications
                for (const auto &e : room.ephemeral.events) {
                    if (auto receiptsEv =
                          std::get_if<mtx::events::EphemeralEvent<mtx::events::ephemeral::Receipt>>(
                            &e)) {
                        std::vector<QString> receipts;

                        for (const auto &[event_id, userReceipts] : receiptsEv->content.receipts) {
                            if (auto r = userReceipts.find(mtx::events::ephemeral::Receipt::Read);
                                r != userReceipts.end()) {
                                for (const auto &[user_id, receipt] : r->second.users) {
                                    (void)receipt;

                                    if (user_id == local_user) {
                                        receipts.push_back(QString::fromStdString(event_id));
                                        break;
                                    }
                                }
                            }
                            if (auto r =
                                  userReceipts.find(mtx::events::ephemeral::Receipt::ReadPrivate);
                                r != userReceipts.end()) {
                                for (const auto &[user_id, receipt] : r->second.users) {
                                    (void)receipt;

                                    if (user_id == local_user) {
                                        receipts.push_back(QString::fromStdString(event_id));
                                        break;
                                    }
                                }
                            }
                        }
                        if (!receipts.empty())
                            notificationsManager->removeNotifications(
                              QString::fromStdString(room_id), receipts);
                    }
                }

                // calculate new notifications
                if (!room.timeline.events.empty() &&
                    (room.unread_notifications.notification_count ||
                     room.unread_notifications.highlight_count)) {
                    auto roomModel =
                      view_manager_->rooms()->getRoomById(QString::fromStdString(room_id));

                    if (!roomModel) {
                        continue;
                    }

                    auto currentReadMarker =
                      cache::getEventIndex(room_id, cache::client()->getFullyReadEventId(room_id));

                    auto ctx = roomModel->pushrulesRoomContext();
                    std::vector<
                      std::pair<mtx::common::Relation, mtx::events::collections::TimelineEvents>>
                      relatedEvents;

                    for (const auto &event : room.timeline.events) {
                        auto event_id = mtx::accessors::event_id(event);

                        // skip already read events
                        if (currentReadMarker &&
                            currentReadMarker > cache::getEventIndex(room_id, event_id))
                            continue;

                        // skip our messages
                        auto sender = mtx::accessors::sender(event);
                        if (sender == http::client()->user_id().to_string())
                            continue;

                        mtx::events::collections::TimelineEvents te{event};
                        std::visit([room_id = room_id](auto &event_) { event_.room_id = room_id; },
                                   te);

                        if (auto encryptedEvent =
                              std::get_if<mtx::events::EncryptedEvent<mtx::events::msg::Encrypted>>(
                                &event);
                            encryptedEvent && userSettings_->decryptNotifications()) {
                            MegolmSessionIndex index(room_id, encryptedEvent->content);

                            auto result = olm::decryptEvent(index, *encryptedEvent);
                            if (result.event)
                                te = std::move(result.event).value();
                        }

                        relatedEvents.clear();
                        for (const auto &r : mtx::accessors::relations(te).relations) {
                            auto related = cache::client()->getEvent(room_id, r.event_id);
                            if (related) {
                                relatedEvents.emplace_back(r, *related);
                                if (auto encryptedEvent = std::get_if<
                                      mtx::events::EncryptedEvent<mtx::events::msg::Encrypted>>(
                                      &related.value());
                                    encryptedEvent && userSettings_->decryptNotifications()) {
                                    MegolmSessionIndex index(room_id, encryptedEvent->content);

                                    auto result = olm::decryptEvent(index, *encryptedEvent);
                                    if (result.event)
                                        relatedEvents.back().second =
                                          std::move(result.event).value();
                                }
                            }
                        }

                        auto actions = pushrules->evaluate(te, ctx, relatedEvents);
                        if (std::find(actions.begin(),
                                      actions.end(),
                                      mtx::pushrules::actions::Action{
                                        mtx::pushrules::actions::notify{}}) != actions.end()) {
                            if (!cache::isNotificationSent(event_id)) {
                                // We should only send one notification per event.
                                cache::markSentNotification(event_id);

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

                                if (userSettings_->hasDesktopNotifications()) {
                                    notifications.emplace_back(roomModel, te, room_id, actions);
                                }
                            }
                        }
                    }
                }
            }
            if (notifications.size() <= 5) {
                for (const auto &[roomModel, te, room_id, actions] : notifications) {
                    AvatarProvider::resolve(
                      roomModel->roomAvatarUrl(),
                      96,
                      this,
                      [this, te = te, room_id = room_id, actions = actions](QPixmap image) {
                          notificationsManager->postNotification(
                            mtx::responses::Notification{
                              .actions     = actions,
                              .event       = std::move(te),
                              .read        = false,
                              .profile_tag = "",
                              .room_id     = room_id,
                              .ts          = 0,
                            },
                            image.toImage());
                      });
                }
            } else if (!notifications.empty()) {
                std::map<QSharedPointer<TimelineModel>, std::size_t> missedEvents;
                for (const auto &[roomModel, te, room_id, actions] : notifications) {
                    missedEvents[roomModel]++;
                }
                QString body;
                for (const auto &[roomModel, nbNotifs] : missedEvents) {
                    body += tr("%n unread message(s) in room %1\n", nullptr, nbNotifs)
                              .arg(roomModel->roomName());
                }
                emit notificationsManager->systemPostNotificationCb(
                  "", "", "New messages while away", body, QImage());
            }
        }
    });

    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);

    connect(
      this,
      &ChatPage::startRemoveFallbackKeyTimer,
      this,
      [this]() {
          QTimer::singleShot(std::chrono::minutes(5), this, &ChatPage::removeOldFallbackKey);
          disconnect(
            this, &ChatPage::newSyncResponse, this, &ChatPage::startRemoveFallbackKeyTimer);
      },
      Qt::QueuedConnection);

    connect(
      this,
      &ChatPage::callFunctionOnGuiThread,
      this,
      [](std::function<void()> f) { f(); },
      Qt::QueuedConnection);

    connectCallMessage<mtx::events::voip::CallInvite>();
    connectCallMessage<mtx::events::voip::CallCandidates>();
    connectCallMessage<mtx::events::voip::CallAnswer>();
    connectCallMessage<mtx::events::voip::CallHangUp>();
    connectCallMessage<mtx::events::voip::CallSelectAnswer>();
    connectCallMessage<mtx::events::voip::CallReject>();
    connectCallMessage<mtx::events::voip::CallNegotiate>();
}

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();

    auto btn = QMessageBox::warning(
      nullptr,
      tr("Confirm logout"),
      tr("Because of the following reason Nheko wants to drop you to the login page:\n%1\nIf you "
         "think this is a mistake, you can close Nheko instead to possibly recover your encryption "
         "keys. After you have been dropped to the login page, you can sign in again using your "
         "usual methods.")
        .arg(msg),
      QMessageBox::StandardButton::Close | QMessageBox::StandardButton::Ok,
      QMessageBox::StandardButton::Ok);
    if (btn == QMessageBox::StandardButton::Close) {
        QCoreApplication::exit(1);
        exit(1);
    }

    resetUI();
    deleteConfigs();

    emit showLoginPage(msg);
}

void
ChatPage::resetUI()
{
    view_manager_->clearAll();

    emit unreadMessages(0);
}

void
ChatPage::deleteConfigs()
{
    auto settings = UserSettings::instance()->qsettings();

    if (UserSettings::instance()->profile() != QLatin1String("")) {
        settings->beginGroup(QStringLiteral("profile"));
        settings->beginGroup(UserSettings::instance()->profile());
    }
    settings->beginGroup(QStringLiteral("auth"));
    settings->remove(QLatin1String(""));
    settings->endGroup(); // auth
    if (UserSettings::instance()->profile() != QLatin1String("")) {
        settings->endGroup(); // profilename
        settings->endGroup(); // profile
    }

    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());
    http::client()->verify_certificates(!UserSettings::instance()->disableCertificateValidation());

    // 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::databaseReady, this, [this]() {
            nhlog::db()->info("database ready");

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

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

                // 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(cache::client()->pickleSecret()));
            } 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();
            getBackupVersion();
            tryInitialSync();
            callManager_->refreshTurnServer();
            emit MainWindow::instance()->reload();
        });

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

        connect(cache::client(), &Cache::secretChanged, this, [this](const std::string &secret) {
            if (secret == mtx::secret_storage::secrets::megolm_backup_v1) {
                getBackupVersion();
            }
        });
    } catch (const lmdb::error &e) {
        nhlog::db()->critical("failure during boot: {}", e.what());
        emit dropToLoginPageCb(tr("Failed to open database, logging out!"));
    }
}

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

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

        emit initializeEmptyViews();

        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 nlohmann::json::exception &e) {
        nhlog::db()->critical("failed to parse cache data: {}", e.what());
        emit dropToLoginPageCb(tr("Failed to restore save data. Please login again."));
        return;
    } catch (const std::exception &e) {
        nhlog::db()->critical("failed to load cache data: {}", e.what());
        emit dropToLoginPageCb(tr("Failed to restore save data. Please login again."));
        return;
    }

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

    getProfileInfo();
    getBackupVersion();
    verifyOneTimeKeyCountAfterStartup();
    callManager_->refreshTurnServer();

    emit contentLoaded();

    // Start receiving events.
    connect(this, &ChatPage::newSyncResponse, &ChatPage::startRemoveFallbackKeyTimer);
    emit trySyncCb();
}

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.
    }
}

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, true);

    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);

              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::client()->forget_old_fallback_key();
          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);

          cache::client()->markUserKeysOutOfDate({http::client()->user_id().to_string()});

          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: {}", err);

            // 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;
            }
            }
        }

        QTimer::singleShot(0, this, [this, res] {
            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));

                cache::calculateRoomReadStatus();
            } 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, const std::string &prev_batch_token)
{
    try {
        if (prev_batch_token != cache::nextBatchToken()) {
            nhlog::net()->warn("Duplicate sync, dropping");
            return;
        }
    } catch (const lmdb::error &) {
        nhlog::db()->warn("Logged out in the mean time, dropping sync");
        return;
    }

    nhlog::net()->debug("sync completed: {}", res.next_batch);

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

    // 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 syncUI(std::move(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 = opts.since](const mtx::responses::Sync &res, mtx::http::RequestErr err) {
          if (err) {
              const auto error = QString::fromStdString(err->matrix_error.error);
              const auto msg   = tr("Please try to login again: %1").arg(error);

              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: {}", *err);
              emit tryDelayedSyncCb();
              return;
          }

          emit newSyncResponse(res, since);
      });
}

void
ChatPage::knockRoom(const QString &room,
                    const std::vector<std::string> &via,
                    QString reason,
                    bool failedJoin,
                    bool promptForConfirmation)
{
    const auto room_id = room.toStdString();
    bool confirmed     = false;
    if (promptForConfirmation) {
        reason = QInputDialog::getText(
          nullptr,
          tr("Knock on room"),
          // clang-format off
      failedJoin
        ? tr("You failed to join %1. You can try to knock so that others can invite you in. Do you want to do so?\nYou may optionally provide a reason for others to accept your knock:").arg(room)
        : tr("Do you really want to knock on %1? You may optionally provide a reason for others to accept your knock:").arg(room),
          // clang-format on
          QLineEdit::Normal,
          reason,
          &confirmed);
        if (!confirmed) {
            return;
        }
    }

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

void
ChatPage::joinRoom(const QString &room, const QString &reason)
{
    const auto room_id = room.toStdString();
    joinRoomVia(room_id, {}, false, reason);
}

void
ChatPage::joinRoomVia(const std::string &room_id,
                      const std::vector<std::string> &via,
                      bool promptForConfirmation,
                      const QString &reason)
{
    if (promptForConfirmation) {
        auto prompt = new RoomSummary(room_id, via, reason);
        QQmlEngine::setObjectOwnership(prompt, QQmlEngine::JavaScriptOwnership);
        emit showRoomJoinPrompt(prompt);
        return;
    }

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

          // 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()));
          }

          view_manager_->rooms()->setCurrentRoom(QString::fromStdString(room_id));
      },
      reason.toStdString());
}

void
ChatPage::createRoom(const mtx::requests::CreateRoom &req)
{
    if (req.room_alias_name.find(":") != std::string::npos ||
        req.room_alias_name.find("#") != std::string::npos) {
        nhlog::net()->warn("Failed to create room: Some characters are not allowed in alias");
        emit this->showNotification(tr("Room creation failed: Bad Alias"));
        return;
    }

    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;

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

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

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

void
ChatPage::leaveRoom(const QString &room_id, const QString &reason)
{
    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)));
              nhlog::net()->error("Failed to leave room '{}': {}", room_id.toStdString(), err);

              if (err->status_code == 404 &&
                  err->matrix_error.errcode == mtx::errors::ErrorCode::M_UNKNOWN) {
                  nhlog::db()->debug(
                    "Removing invite and room for {}, even though we couldn't leave.",
                    room_id.toStdString());
                  cache::client()->removeInvite(room_id.toStdString());
                  cache::client()->removeRoom(room_id.toStdString());
              }
              return;
          }

          emit leftRoom(room_id);
      },
      reason.toStdString());
}

void
ChatPage::changeRoom(const QString &room_id)
{
    view_manager_->rooms()->setCurrentRoom(room_id);
}

void
ChatPage::inviteUser(const QString &room, QString userid, QString reason)
{
    if (QMessageBox::question(nullptr,
                              tr("Confirm invite"),
                              tr("Do you really want to invite %1 (%2)?")
                                .arg(cache::displayName(room, userid), 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) {
              nhlog::net()->error(
                "Failed to invite {} to {}: {}", userid.toStdString(), room.toStdString(), *err);
              emit showNotification(
                tr("Failed to invite %1 to %2: %3")
                  .arg(userid, room, QString::fromStdString(err->matrix_error.error)));
          } else
              emit showNotification(tr("Invited user: %1").arg(userid));
      },
      reason.trimmed().toStdString());
}
void