TimelineModel.cpp

#include "TimelineModel.h"

#include <algorithm>
#include <thread>
#include <type_traits>

#include <QCache>
#include <QFileDialog>
#include <QMimeDatabase>
#include <QRegularExpression>
#include <QSettings>
#include <QStandardPaths>

#include "ChatPage.h"
#include "EventAccessors.h"
#include "Logging.h"
#include "MainWindow.h"
#include "MatrixClient.h"
#include "MxcImageProvider.h"
#include "Olm.h"
#include "TimelineViewManager.h"
#include "Utils.h"
#include "dialogs/RawMessage.h"

#include <iostream>

Q_DECLARE_METATYPE(QModelIndex)

namespace std {
inline uint
qHash(const std::string &key, uint seed = 0)
{
        return qHash(QByteArray::fromRawData(key.data(), key.length()), seed);
}
}

namespace {
struct RoomEventType
{
        template<class T>
        qml_mtx_events::EventType operator()(const mtx::events::Event<T> &e)
        {
                using mtx::events::EventType;
                switch (e.type) {
                case EventType::RoomKeyRequest:
                        return qml_mtx_events::EventType::KeyRequest;
                case EventType::Reaction:
                        return qml_mtx_events::EventType::Reaction;
                case EventType::RoomAliases:
                        return qml_mtx_events::EventType::Aliases;
                case EventType::RoomAvatar:
                        return qml_mtx_events::EventType::Avatar;
                case EventType::RoomCanonicalAlias:
                        return qml_mtx_events::EventType::CanonicalAlias;
                case EventType::RoomCreate:
                        return qml_mtx_events::EventType::RoomCreate;
                case EventType::RoomEncrypted:
                        return qml_mtx_events::EventType::Encrypted;
                case EventType::RoomEncryption:
                        return qml_mtx_events::EventType::Encryption;
                case EventType::RoomGuestAccess:
                        return qml_mtx_events::EventType::RoomGuestAccess;
                case EventType::RoomHistoryVisibility:
                        return qml_mtx_events::EventType::RoomHistoryVisibility;
                case EventType::RoomJoinRules:
                        return qml_mtx_events::EventType::RoomJoinRules;
                case EventType::RoomMember:
                        return qml_mtx_events::EventType::Member;
                case EventType::RoomMessage:
                        return qml_mtx_events::EventType::UnknownMessage;
                case EventType::RoomName:
                        return qml_mtx_events::EventType::Name;
                case EventType::RoomPowerLevels:
                        return qml_mtx_events::EventType::PowerLevels;
                case EventType::RoomTopic:
                        return qml_mtx_events::EventType::Topic;
                case EventType::RoomTombstone:
                        return qml_mtx_events::EventType::Tombstone;
                case EventType::RoomRedaction:
                        return qml_mtx_events::EventType::Redaction;
                case EventType::RoomPinnedEvents:
                        return qml_mtx_events::EventType::PinnedEvents;
                case EventType::Sticker:
                        return qml_mtx_events::EventType::Sticker;
                case EventType::Tag:
                        return qml_mtx_events::EventType::Tag;
                case EventType::Unsupported:
                        return qml_mtx_events::EventType::Unsupported;
                default:
                        return qml_mtx_events::EventType::UnknownMessage;
                }
        }
        qml_mtx_events::EventType operator()(const mtx::events::Event<mtx::events::msg::Audio> &)
        {
                return qml_mtx_events::EventType::AudioMessage;
        }
        qml_mtx_events::EventType operator()(const mtx::events::Event<mtx::events::msg::Emote> &)
        {
                return qml_mtx_events::EventType::EmoteMessage;
        }
        qml_mtx_events::EventType operator()(const mtx::events::Event<mtx::events::msg::File> &)
        {
                return qml_mtx_events::EventType::FileMessage;
        }
        qml_mtx_events::EventType operator()(const mtx::events::Event<mtx::events::msg::Image> &)
        {
                return qml_mtx_events::EventType::ImageMessage;
        }
        qml_mtx_events::EventType operator()(const mtx::events::Event<mtx::events::msg::Notice> &)
        {
                return qml_mtx_events::EventType::NoticeMessage;
        }
        qml_mtx_events::EventType operator()(const mtx::events::Event<mtx::events::msg::Text> &)
        {
                return qml_mtx_events::EventType::TextMessage;
        }
        qml_mtx_events::EventType operator()(const mtx::events::Event<mtx::events::msg::Video> &)
        {
                return qml_mtx_events::EventType::VideoMessage;
        }
        qml_mtx_events::EventType operator()(
          const mtx::events::Event<mtx::events::msg::KeyVerificationRequest> &)
        {
                return qml_mtx_events::EventType::KeyVerificationRequest;
        }
        qml_mtx_events::EventType operator()(
          const mtx::events::Event<mtx::events::msg::KeyVerificationStart> &)
        {
                return qml_mtx_events::EventType::KeyVerificationStart;
        }
        qml_mtx_events::EventType operator()(
          const mtx::events::Event<mtx::events::msg::KeyVerificationMac> &)
        {
                return qml_mtx_events::EventType::KeyVerificationMac;
        }
        qml_mtx_events::EventType operator()(
          const mtx::events::Event<mtx::events::msg::KeyVerificationAccept> &)
        {
                return qml_mtx_events::EventType::KeyVerificationAccept;
        }
        qml_mtx_events::EventType operator()(
          const mtx::events::Event<mtx::events::msg::KeyVerificationCancel> &)
        {
                return qml_mtx_events::EventType::KeyVerificationCancel;
        }
        qml_mtx_events::EventType operator()(
          const mtx::events::Event<mtx::events::msg::KeyVerificationKey> &)
        {
                return qml_mtx_events::EventType::KeyVerificationKey;
        }
        qml_mtx_events::EventType operator()(
          const mtx::events::Event<mtx::events::msg::KeyVerificationDone> &)
        {
                return qml_mtx_events::EventType::KeyVerificationDone;
        }
        qml_mtx_events::EventType operator()(const mtx::events::Event<mtx::events::msg::Redacted> &)
        {
                return qml_mtx_events::EventType::Redacted;
        }
        // ::EventType::Type operator()(const Event<mtx::events::msg::Location> &e) { return
        // ::EventType::LocationMessage; }
};
}

qml_mtx_events::EventType
toRoomEventType(const mtx::events::collections::TimelineEvents &event)
{
        return std::visit(RoomEventType{}, event);
}

QString
toRoomEventTypeString(const mtx::events::collections::TimelineEvents &event)
{
        return std::visit([](const auto &e) { return QString::fromStdString(to_string(e.type)); },
                          event);
}

TimelineModel::TimelineModel(TimelineViewManager *manager, QString room_id, QObject *parent)
  : QAbstractListModel(parent)
  , events(room_id.toStdString(), this)
  , room_id_(room_id)
  , manager_(manager)
{
        connect(
          this,
          &TimelineModel::redactionFailed,
          this,
          [](const QString &msg) { emit ChatPage::instance()->showNotification(msg); },
          Qt::QueuedConnection);

        connect(this,
                &TimelineModel::newMessageToSend,
                this,
                &TimelineModel::addPendingMessage,
                Qt::QueuedConnection);
        connect(this, &TimelineModel::addPendingMessageToStore, &events, &EventStore::addPending);

        connect(
          &events,
          &EventStore::dataChanged,
          this,
          [this](int from, int to) {
                  nhlog::ui()->debug(
                    "data changed {} to {}", events.size() - to - 1, events.size() - from - 1);
                  emit dataChanged(index(events.size() - to - 1, 0),
                                   index(events.size() - from - 1, 0));
          },
          Qt::QueuedConnection);

        connect(&events, &EventStore::beginInsertRows, this, [this](int from, int to) {
                int first = events.size() - to;
                int last  = events.size() - from;
                if (from >= events.size()) {
                        int batch_size = to - from;
                        first += batch_size;
                        last += batch_size;
                } else {
                        first -= 1;
                        last -= 1;
                }
                nhlog::ui()->debug("begin insert from {} to {}", first, last);
                beginInsertRows(QModelIndex(), first, last);
        });
        connect(&events, &EventStore::endInsertRows, this, [this]() { endInsertRows(); });
        connect(&events, &EventStore::beginResetModel, this, [this]() { beginResetModel(); });
        connect(&events, &EventStore::endResetModel, this, [this]() { endResetModel(); });
        connect(&events, &EventStore::newEncryptedImage, this, &TimelineModel::newEncryptedImage);
        connect(
          &events, &EventStore::fetchedMore, this, [this]() { setPaginationInProgress(false); });
}

QHash<int, QByteArray>
TimelineModel::roleNames() const
{
        return {
          {Section, "section"},
          {Type, "type"},
          {TypeString, "typeString"},
          {IsOnlyEmoji, "isOnlyEmoji"},
          {Body, "body"},
          {FormattedBody, "formattedBody"},
          {UserId, "userId"},
          {UserName, "userName"},
          {Timestamp, "timestamp"},
          {Url, "url"},
          {ThumbnailUrl, "thumbnailUrl"},
          {Blurhash, "blurhash"},
          {Filename, "filename"},
          {Filesize, "filesize"},
          {MimeType, "mimetype"},
          {Height, "height"},
          {Width, "width"},
          {ProportionalHeight, "proportionalHeight"},
          {Id, "id"},
          {State, "state"},
          {IsEncrypted, "isEncrypted"},
          {IsRoomEncrypted, "isRoomEncrypted"},
          {ReplyTo, "replyTo"},
          {Reactions, "reactions"},
          {RoomId, "roomId"},
          {RoomName, "roomName"},
          {RoomTopic, "roomTopic"},
          {Dump, "dump"},
        };
}
int
TimelineModel::rowCount(const QModelIndex &parent) const
{
        Q_UNUSED(parent);
        return this->events.size();
}

QVariantMap
TimelineModel::getDump(QString eventId, QString relatedTo) const
{
        if (auto event = events.get(eventId.toStdString(), relatedTo.toStdString()))
                return data(*event, Dump).toMap();
        return {};
}

QVariant
TimelineModel::data(const mtx::events::collections::TimelineEvents &event, int role) const
{
        using namespace mtx::accessors;
        namespace acc = mtx::accessors;

        switch (role) {
        case UserId:
                return QVariant(QString::fromStdString(acc::sender(event)));
        case UserName:
                return QVariant(displayName(QString::fromStdString(acc::sender(event))));

        case Timestamp:
                return QVariant(origin_server_ts(event));
        case Type:
                return QVariant(toRoomEventType(event));
        case TypeString:
                return QVariant(toRoomEventTypeString(event));
        case IsOnlyEmoji: {
                QString qBody = QString::fromStdString(body(event));

                QVector<uint> utf32_string = qBody.toUcs4();
                int emojiCount             = 0;

                for (auto &code : utf32_string) {
                        if (utils::codepointIsEmoji(code)) {
                                emojiCount++;
                        } else {
                                return QVariant(0);
                        }
                }

                return QVariant(emojiCount);
        }
        case Body:
                return QVariant(utils::replaceEmoji(QString::fromStdString(body(event))));
        case FormattedBody: {
                const static QRegularExpression replyFallback(
                  "<mx-reply>.*</mx-reply>", QRegularExpression::DotMatchesEverythingOption);

                bool isReply = !in_reply_to_event(event).empty();

                auto formattedBody_ = QString::fromStdString(formatted_body(event));
                if (formattedBody_.isEmpty()) {
                        auto body_ = QString::fromStdString(body(event));

                        if (isReply) {
                                while (body_.startsWith("> "))
                                        body_ = body_.right(body_.size() - body_.indexOf('\n') - 1);
                                if (body_.startsWith('\n'))
                                        body_ = body_.right(body_.size() - 1);
                        }
                        formattedBody_ = body_.toHtmlEscaped().replace('\n', "<br>");
                } else {
                        if (isReply)
                                formattedBody_ = formattedBody_.remove(replyFallback);
                }

                formattedBody_.replace("<img src=\"mxc:&#47;&#47;", "<img src=\"image://mxcImage/");
                formattedBody_.replace("<img src=\"mxc://", "<img src=\"image://mxcImage/");

                return QVariant(utils::replaceEmoji(
                  utils::linkifyMessage(utils::escapeBlacklistedHtml(formattedBody_))));
        }
        case Url:
                return QVariant(QString::fromStdString(url(event)));
        case ThumbnailUrl:
                return QVariant(QString::fromStdString(thumbnail_url(event)));
        case Blurhash:
                return QVariant(QString::fromStdString(blurhash(event)));
        case Filename:
                return QVariant(QString::fromStdString(filename(event)));
        case Filesize:
                return QVariant(utils::humanReadableFileSize(filesize(event)));
        case MimeType:
                return QVariant(QString::fromStdString(mimetype(event)));
        case Height:
                return QVariant(qulonglong{media_height(event)});
        case Width:
                return QVariant(qulonglong{media_width(event)});
        case ProportionalHeight: {
                auto w = media_width(event);
                if (w == 0)
                        w = 1;

                double prop = media_height(event) / (double)w;

                return QVariant(prop > 0 ? prop : 1.);
        }
        case Id:
                return QVariant(QString::fromStdString(event_id(event)));
        case State: {
                auto id             = QString::fromStdString(event_id(event));
                auto containsOthers = [](const auto &vec) {
                        for (const auto &e : vec)
                                if (e.second != http::client()->user_id().to_string())
                                        return true;
                        return false;
                };

                // only show read receipts for messages not from us
                if (acc::sender(event) != http::client()->user_id().to_string())
                        return qml_mtx_events::Empty;
                else if (!id.isEmpty() && id[0] == "m")
                        return qml_mtx_events::Sent;
                else if (read.contains(id) || containsOthers(cache::readReceipts(id, room_id_)))
                        return qml_mtx_events::Read;
                else
                        return qml_mtx_events::Received;
        }
        case IsEncrypted: {
                auto id              = event_id(event);
                auto encrypted_event = events.get(id, id, false);
                return encrypted_event &&
                       std::holds_alternative<
                         mtx::events::EncryptedEvent<mtx::events::msg::Encrypted>>(
                         *encrypted_event);
        }
        case IsRoomEncrypted: {
                return cache::isRoomEncrypted(room_id_.toStdString());
        }
        case ReplyTo:
                return QVariant(QString::fromStdString(in_reply_to_event(event)));
        case Reactions: {
                auto id = event_id(event);
                return QVariant::fromValue(events.reactions(id));
        }
        case RoomId:
                return QVariant(room_id_);
        case RoomName:
                return QVariant(QString::fromStdString(room_name(event)));
        case RoomTopic:
                return QVariant(QString::fromStdString(room_topic(event)));
        case Dump: {
                QVariantMap m;
                auto names = roleNames();

                // m.insert(names[Section], data(id, static_cast<int>(Section)));
                m.insert(names[Type], data(event, static_cast<int>(Type)));
                m.insert(names[TypeString], data(event, static_cast<int>(TypeString)));
                m.insert(names[IsOnlyEmoji], data(event, static_cast<int>(IsOnlyEmoji)));
                m.insert(names[Body], data(event, static_cast<int>(Body)));
                m.insert(names[FormattedBody], data(event, static_cast<int>(FormattedBody)));
                m.insert(names[UserId], data(event, static_cast<int>(UserId)));
                m.insert(names[UserName], data(event, static_cast<int>(UserName)));
                m.insert(names[Timestamp], data(event, static_cast<int>(Timestamp)));
                m.insert(names[Url], data(event, static_cast<int>(Url)));
                m.insert(names[ThumbnailUrl], data(event, static_cast<int>(ThumbnailUrl)));
                m.insert(names[Blurhash], data(event, static_cast<int>(Blurhash)));
                m.insert(names[Filename], data(event, static_cast<int>(Filename)));
                m.insert(names[Filesize], data(event, static_cast<int>(Filesize)));
                m.insert(names[MimeType], data(event, static_cast<int>(MimeType)));
                m.insert(names[Height], data(event, static_cast<int>(Height)));
                m.insert(names[Width], data(event, static_cast<int>(Width)));
                m.insert(names[ProportionalHeight],
                         data(event, static_cast<int>(ProportionalHeight)));
                m.insert(names[Id], data(event, static_cast<int>(Id)));
                m.insert(names[State], data(event, static_cast<int>(State)));
                m.insert(names[IsEncrypted], data(event, static_cast<int>(IsEncrypted)));
                m.insert(names[IsRoomEncrypted], data(event, static_cast<int>(IsRoomEncrypted)));
                m.insert(names[ReplyTo], data(event, static_cast<int>(ReplyTo)));
                m.insert(names[RoomName], data(event, static_cast<int>(RoomName)));
                m.insert(names[RoomTopic], data(event, static_cast<int>(RoomTopic)));

                return QVariant(m);
        }
        default:
                return QVariant();
        }
}

QVariant
TimelineModel::data(const QModelIndex &index, int role) const
{
        using namespace mtx::accessors;
        namespace acc = mtx::accessors;
        if (index.row() < 0 && index.row() >= rowCount())
                return QVariant();

        auto event = events.get(rowCount() - index.row() - 1);

        if (!event)
                return "";

        if (role == Section) {
                QDateTime date = origin_server_ts(*event);
                date.setTime(QTime());

                std::string userId = acc::sender(*event);

                for (int r = rowCount() - index.row(); r < events.size(); r++) {
                        auto tempEv = events.get(r);
                        if (!tempEv)
                                break;

                        QDateTime prevDate = origin_server_ts(*tempEv);
                        prevDate.setTime(QTime());
                        if (prevDate != date)
                                return QString("%2 %1")
                                  .arg(date.toMSecsSinceEpoch())
                                  .arg(QString::fromStdString(userId));

                        std::string prevUserId = acc::sender(*tempEv);
                        if (userId != prevUserId)
                                break;
                }

                return QString("%1").arg(QString::fromStdString(userId));
        }

        return data(*event, role);
}

bool
TimelineModel::canFetchMore(const QModelIndex &) const
{
        if (!events.size())
                return true;
        if (auto first = events.get(0);
            first &&
            !std::holds_alternative<mtx::events::StateEvent<mtx::events::state::Create>>(*first))
                return true;
        else

                return false;
}

void
TimelineModel::setPaginationInProgress(const bool paginationInProgress)
{
        if (m_paginationInProgress == paginationInProgress) {
                return;
        }

        m_paginationInProgress = paginationInProgress;
        emit paginationInProgressChanged(m_paginationInProgress);
}

void
TimelineModel::fetchMore(const QModelIndex &)
{
        if (m_paginationInProgress) {
                nhlog::ui()->warn("Already loading older messages");
                return;
        }

        setPaginationInProgress(true);

        events.fetchMore();
}

void
TimelineModel::addEvents(const mtx::responses::Timeline &timeline)
{
        if (timeline.events.empty())
                return;

        events.handleSync(timeline);

        if (!timeline.events.empty())
                updateLastMessage();
}

template<typename T>
auto
isMessage(const mtx::events::RoomEvent<T> &e)
  -> std::enable_if_t<std::is_same<decltype(e.content.msgtype), std::string>::value, bool>
{
        return true;
}

template<typename T>
auto
isMessage(const mtx::events::Event<T> &)
{
        return false;
}

template<typename T>
auto
isMessage(const mtx::events::EncryptedEvent<T> &)
{
        return true;
}

// Workaround. We also want to see a room at the top, if we just joined it
auto
isYourJoin(const mtx::events::StateEvent<mtx::events::state::Member> &e)
{
        return e.content.membership == mtx::events::state::Membership::Join &&
               e.state_key == http::client()->user_id().to_string();
}
template<typename T>
auto
isYourJoin(const mtx::events::Event<T> &)
{
        return false;
}

void
TimelineModel::updateLastMessage()
{
        for (auto it = events.size() - 1; it >= 0; --it) {
                auto event = events.get(it, decryptDescription);
                if (!event)
                        continue;

                if (std::visit([](const auto &e) -> bool { return isYourJoin(e); }, *event)) {
                        auto time   = mtx::accessors::origin_server_ts(*event);
                        uint64_t ts = time.toMSecsSinceEpoch();
                        emit manager_->updateRoomsLastMessage(
                          room_id_,
                          DescInfo{QString::fromStdString(mtx::accessors::event_id(*event)),
                                   QString::fromStdString(http::client()->user_id().to_string()),
                                   tr("You joined this room."),
                                   utils::descriptiveTime(time),
                                   ts,
                                   time});
                        return;
                }
                if (!std::visit([](const auto &e) -> bool { return isMessage(e); }, *event))
                        continue;

                auto description = utils::getMessageDescription(
                  *event, QString::fromStdString(http::client()->user_id().to_string()), room_id_);
                emit manager_->updateRoomsLastMessage(room_id_, description);
                return;
        }
}

std::vector<QString>
TimelineModel::internalAddEvents(
  const std::vector<mtx::events::collections::TimelineEvents> &timeline)
{
        std::vector<QString> ids;
        for (auto e : timeline) {
                QString id = QString::fromStdString(mtx::accessors::event_id(e));

                if (this->events.contains(id)) {
                        this->events.insert(id, e);
                        int idx = idToIndex(id);
                        emit dataChanged(index(idx, 0), index(idx, 0));
                        continue;
                }

                QString txid = QString::fromStdString(mtx::accessors::transaction_id(e));
                if (this->pending.removeOne(txid)) {
                        this->events.insert(id, e);
                        this->events.remove(txid);
                        int idx = idToIndex(txid);
                        if (idx < 0) {
                                nhlog::ui()->warn("Received index out of range");
                                continue;
                        }
                        eventOrder[idx] = id;
                        emit dataChanged(index(idx, 0), index(idx, 0));
                        continue;
                }

                if (std::get_if<mtx::events::RoomEvent<mtx::events::msg::KeyVerificationRequest>>(
                      &e)) {
                        std::cout << "got a request" << std::endl;
                }

                if (auto cancelVerification =
                      std::get_if<mtx::events::RoomEvent<mtx::events::msg::KeyVerificationCancel>>(
                        &e)) {
                        std::cout<<"it is happening"<<std::endl;
                        if (cancelVerification->content.relates_to.has_value()) {
                                QString event_id = QString::fromStdString(
                                  cancelVerification->content.relates_to.value()
                                    .in_reply_to.event_id);
                                auto request =
                                  std::find(eventOrder.begin(), eventOrder.end(), event_id);
                                if (request != eventOrder.end()) {
                                        auto event = events.value(event_id);
                                        auto e     = std::get_if<mtx::events::RoomEvent<
                                          mtx::events::msg::KeyVerificationRequest>>(&event);
                                        std::cout<<json(*e)<<std::endl;
                                }
                        }
                }

                if (auto redaction =
                      std::get_if<mtx::events::RedactionEvent<mtx::events::msg::Redaction>>(&e)) {
                        QString redacts = QString::fromStdString(redaction->redacts);
                        auto redacted   = std::find(eventOrder.begin(), eventOrder.end(), redacts);

                        auto event = events.value(redacts);
                        if (auto reaction =
                              std::get_if<mtx::events::RoomEvent<mtx::events::msg::Reaction>>(
                                &event)) {
                                QString reactedTo =
                                  QString::fromStdString(reaction->content.relates_to.event_id);
                                reactions[reactedTo].removeReaction(*reaction);
                                int idx = idToIndex(reactedTo);
                                if (idx >= 0)
                                        emit dataChanged(index(idx, 0), index(idx, 0));
                        }

                        if (redacted != eventOrder.end()) {
                                auto redactedEvent = std::visit(
                                  [](const auto &ev)
                                    -> mtx::events::RoomEvent<mtx::events::msg::Redacted> {
                                          mtx::events::RoomEvent<mtx::events::msg::Redacted>
                                            replacement                = {};
                                          replacement.event_id         = ev.event_id;
                                          replacement.room_id          = ev.room_id;
                                          replacement.sender           = ev.sender;
                                          replacement.origin_server_ts = ev.origin_server_ts;
                                          replacement.type             = ev.type;
                                          return replacement;
                                  },
                                  e);
                                events.insert(redacts, redactedEvent);

                                int row = (int)std::distance(eventOrder.begin(), redacted);
                                emit dataChanged(index(row, 0), index(row, 0));
                        }

                        continue; // don't insert redaction into timeline
                }

                if (auto reaction =
                      std::get_if<mtx::events::RoomEvent<mtx::events::msg::Reaction>>(&e)) {
                        QString reactedTo =
                          QString::fromStdString(reaction->content.relates_to.event_id);
                        events.insert(id, e);

                        // remove local echo
                        if (!txid.isEmpty()) {
                                auto rCopy     = *reaction;
                                rCopy.event_id = txid.toStdString();
                                reactions[reactedTo].removeReaction(rCopy);
                        }

                        reactions[reactedTo].addReaction(room_id_.toStdString(), *reaction);
                        int idx = idToIndex(reactedTo);
                        if (idx >= 0)
                                emit dataChanged(index(idx, 0), index(idx, 0));
                        continue; // don't insert reaction into timeline
                }

                if (auto event =
                      std::get_if<mtx::events::EncryptedEvent<mtx::events::msg::Encrypted>>(&e)) {
                        auto e_      = decryptEvent(*event).event;
                        auto encInfo = mtx::accessors::file(e_);

                        if (encInfo)
                                emit newEncryptedImage(encInfo.value());
                }

                this->events.insert(id, e);
                ids.push_back(id);

                auto replyTo  = mtx::accessors::in_reply_to_event(e);
                auto qReplyTo = QString::fromStdString(replyTo);
                if (!replyTo.empty() && !events.contains(qReplyTo)) {
                        http::client()->get_event(
                          this->room_id_.toStdString(),
                          replyTo,
                          [this, id, replyTo](
                            const mtx::events::collections::TimelineEvents &timeline,
                            mtx::http::RequestErr err) {
                                  if (err) {
                                          nhlog::net()->error(
                                            "Failed to retrieve event with id {}, which was "
                                            "requested to show the replyTo for event {}",
                                            replyTo,
                                            id.toStdString());
                                          return;
                                  }
                                  emit eventFetched(id, timeline);
                          });
                }
        }
        return ids;
}

void
TimelineModel::setCurrentIndex(int index)
{
        auto oldIndex = idToIndex(currentId);
        currentId     = indexToId(index);
        emit currentIndexChanged(index);

        if ((oldIndex > index || oldIndex == -1) && !currentId.startsWith("m") &&
            ChatPage::instance()->isActiveWindow()) {
                readEvent(currentId.toStdString());
        }
}

void
TimelineModel::readEvent(const std::string &id)
{
        http::client()->read_event(room_id_.toStdString(), id, [this](mtx::http::RequestErr err) {
                if (err) {
                        nhlog::net()->warn("failed to read_event ({}, {})",
                                           room_id_.toStdString(),
                                           currentId.toStdString());
                }
        });
}

QString
TimelineModel::displayName(QString id) const
{
        return cache::displayName(room_id_, id).toHtmlEscaped();
}

QString
TimelineModel::avatarUrl(QString id) const
{
        return cache::avatarUrl(room_id_, id);
}

QString
TimelineModel::formatDateSeparator(QDate date) const
{
        auto now = QDateTime::currentDateTime();

        QString fmt = QLocale::system().dateFormat(QLocale::LongFormat);

        if (now.date().year() == date.year()) {
                QRegularExpression rx("[^a-zA-Z]*y+[^a-zA-Z]*");
                fmt = fmt.remove(rx);
        }

        return date.toString(fmt);
}

QString
TimelineModel::escapeEmoji(QString str) const
{
        return utils::replaceEmoji(str);
}

void
TimelineModel::viewRawMessage(QString id) const
{
        auto e = events.get(id.toStdString(), "", false);
        if (!e)
                return;
        std::string ev = mtx::accessors::serialize_event(*e).dump(4);
        auto dialog    = new dialogs::RawMessage(QString::fromStdString(ev));
        Q_UNUSED(dialog);
}

void
TimelineModel::viewDecryptedRawMessage(QString id) const
{
        auto e = events.get(id.toStdString(), "");
        if (!e)
                return;

        std::string ev = mtx::accessors::serialize_event(*e).dump(4);
        auto dialog    = new dialogs::RawMessage(QString::fromStdString(ev));
        Q_UNUSED(dialog);
}

void
TimelineModel::openUserProfile(QString userid)
{
        emit openProfile(new UserProfile(room_id_, userid, this));
}

void
TimelineModel::replyAction(QString id)
{
        setReply(id);
        ChatPage::instance()->focusMessageInput();
}

RelatedInfo
TimelineModel::relatedInfo(QString id)
{
        auto event = events.get(id.toStdString(), "");
        if (!event)
                return {};

        RelatedInfo related   = {};
        related.quoted_user   = QString::fromStdString(mtx::accessors::sender(*event));
        related.related_event = mtx::accessors::event_id(*event);
        related.type          = mtx::accessors::msg_type(*event);

        // get body, strip reply fallback, then transform the event to text, if it is a media event
        // etc
        related.quoted_body = QString::fromStdString(mtx::accessors::body(*event));
        QRegularExpression plainQuote("^>.*?$\n?", QRegularExpression::MultilineOption);
        while (related.quoted_body.startsWith(">"))
                related.quoted_body.remove(plainQuote);
        if (related.quoted_body.startsWith("\n"))
                related.quoted_body.remove(0, 1);
        related.quoted_body = utils::getQuoteBody(related);

        // get quoted body and strip reply fallback
        related.quoted_formatted_body = mtx::accessors::formattedBodyWithFallback(*event);
        related.quoted_formatted_body.remove(QRegularExpression(
          "<mx-reply>.*</mx-reply>", QRegularExpression::DotMatchesEverythingOption));
        related.room = room_id_;

        return related;
}

void
TimelineModel::readReceiptsAction(QString id) const
{
        MainWindow::instance()->openReadReceiptsDialog(id);
}

void
TimelineModel::redactEvent(QString id)
{
        if (!id.isEmpty())
                http::client()->redact_event(
                  room_id_.toStdString(),
                  id.toStdString(),
                  [this, id](const mtx::responses::EventId &, mtx::http::RequestErr err) {
                          if (err) {
                                  emit redactionFailed(
                                    tr("Message redaction failed: %1")
                                      .arg(QString::fromStdString(err->matrix_error.error)));
                                  return;
                          }

                          emit eventRedacted(id);
                  });
}

int
TimelineModel::idToIndex(QString id) const
{
        if (id.isEmpty())
                return -1;

        auto idx = events.idToIndex(id.toStdString());
        if (idx)
                return events.size() - *idx - 1;
        else
                return -1;
}

QString
TimelineModel::indexToId(int index) const
{
        auto id = events.indexToId(events.size() - index - 1);
        return id ? QString::fromStdString(*id) : "";
}

// Note: this will only be called for our messages
void
TimelineModel::markEventsAsRead(const std::vector<QString> &event_ids)
{
        for (const auto &id : event_ids) {
                read.insert(id);
                int idx = idToIndex(id);
                if (idx < 0) {
                        nhlog::ui()->warn("Read index out of range");
                        return;
                }
                emit dataChanged(index(idx, 0), index(idx, 0));
        }
}

void
TimelineModel::sendEncryptedMessage(const std::string txn_id, nlohmann::json content)
{
        const auto room_id = room_id_.toStdString();

        using namespace mtx::events;
        using namespace mtx::identifiers;

        json doc = {{"type", "m.room.message"}, {"content", content}, {"room_id", room_id}};

        try {
                // Check if we have already an outbound megolm session then we can use.
                if (cache::outboundMegolmSessionExists(room_id)) {
                        mtx::events::EncryptedEvent<mtx::events::msg::Encrypted> event;
                        event.content =
                          olm::encrypt_group_message(room_id, http::client()->device_id(), doc);
                        event.event_id         = txn_id;
                        event.room_id          = room_id;
                        event.sender           = http::client()->user_id().to_string();
                        event.type             = mtx::events::EventType::RoomEncrypted;
                        event.origin_server_ts = QDateTime::currentMSecsSinceEpoch();

                        emit this->addPendingMessageToStore(event);
                        return;
                }

                nhlog::ui()->debug("creating new outbound megolm session");

                // Create a new outbound megolm session.
                auto outbound_session  = olm::client()->init_outbound_group_session();
                const auto session_id  = mtx::crypto::session_id(outbound_session.get());
                const auto session_key = mtx::crypto::session_key(outbound_session.get());

                // TODO: needs to be moved in the lib.
                auto megolm_payload = json{{"algorithm", "m.megolm.v1.aes-sha2"},
                                           {"room_id", room_id},
                                           {"session_id", session_id},
                                           {"session_key", session_key}};

                // Saving the new megolm session.
                // TODO: Maybe it's too early to save.
                OutboundGroupSessionData session_data;
                session_data.session_id    = session_id;
                session_data.session_key   = session_key;
                session_data.message_index = 0; // TODO Update me
                cache::saveOutboundMegolmSession(
                  room_id, session_data, std::move(outbound_session));

                const auto members = cache::roomMembers(room_id);
                nhlog::ui()->info("retrieved {} members for {}", members.size(), room_id);

                auto keeper = std::make_shared<StateKeeper>([room_id, doc, txn_id, this]() {
                        try {
                                mtx::events::EncryptedEvent<mtx::events::msg::Encrypted> event;
                                event.content = olm::encrypt_group_message(
                                  room_id, http::client()->device_id(), doc);