TimelineModel.cpp

// SPDX-FileCopyrightText: 2021 Nheko Contributors
// SPDX-FileCopyrightText: 2022 Nheko Contributors
//
// SPDX-License-Identifier: GPL-3.0-or-later

#include "TimelineModel.h"

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

#include <QClipboard>
#include <QDesktopServices>
#include <QFileDialog>
#include <QGuiApplication>
#include <QMimeDatabase>
#include <QRegularExpression>
#include <QStandardPaths>
#include <QVariant>
#include <utility>

#include "Cache.h"
#include "Cache_p.h"
#include "ChatPage.h"
#include "Config.h"
#include "EventAccessors.h"
#include "Logging.h"
#include "MainWindow.h"
#include "MatrixClient.h"
#include "TimelineViewManager.h"
#include "Utils.h"
#include "encryption/Olm.h"

Q_DECLARE_METATYPE(QModelIndex)

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

namespace {
struct RoomEventType
{
    template<class T>
    qml_mtx_events::EventType operator()(const mtx::events::Event<T> &e)
    {
        return qml_mtx_events::toRoomEventType(e.type);
    }
    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::KeyVerificationReady> &)
    {
        return qml_mtx_events::EventType::KeyVerificationReady;
    }
    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;
    }
    qml_mtx_events::EventType operator()(const mtx::events::Event<mtx::events::msg::CallInvite> &)
    {
        return qml_mtx_events::EventType::CallInvite;
    }
    qml_mtx_events::EventType operator()(const mtx::events::Event<mtx::events::msg::CallAnswer> &)
    {
        return qml_mtx_events::EventType::CallAnswer;
    }
    qml_mtx_events::EventType operator()(const mtx::events::Event<mtx::events::msg::CallHangUp> &)
    {
        return qml_mtx_events::EventType::CallHangUp;
    }
    qml_mtx_events::EventType
    operator()(const mtx::events::Event<mtx::events::msg::CallCandidates> &)
    {
        return qml_mtx_events::EventType::CallCandidates;
    }
    // ::EventType::Type operator()(const Event<mtx::events::msg::Location> &e) { return
    // ::EventType::LocationMessage; }
};
}

qml_mtx_events::EventType
qml_mtx_events::toRoomEventType(mtx::events::EventType e)
{
    using mtx::events::EventType;
    switch (e) {
    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::SpaceParent:
        return qml_mtx_events::EventType::SpaceParent;
    case EventType::SpaceChild:
        return qml_mtx_events::EventType::SpaceChild;
    case EventType::ImagePackInRoom:
        return qml_mtx_events::ImagePackInRoom;
    case EventType::ImagePackInAccountData:
        return qml_mtx_events::ImagePackInAccountData;
    case EventType::ImagePackRooms:
        return qml_mtx_events::ImagePackRooms;
    case EventType::Unsupported:
        return qml_mtx_events::EventType::Unsupported;
    default:
        return qml_mtx_events::EventType::UnknownMessage;
    }
}

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);
}

mtx::events::EventType
qml_mtx_events::fromRoomEventType(qml_mtx_events::EventType t)
{
    switch (t) {
    // Unsupported event
    case qml_mtx_events::Unsupported:
        return mtx::events::EventType::Unsupported;

    /// m.room_key_request
    case qml_mtx_events::KeyRequest:
        return mtx::events::EventType::RoomKeyRequest;
    /// m.reaction:
    case qml_mtx_events::Reaction:
        return mtx::events::EventType::Reaction;
    /// m.room.aliases
    case qml_mtx_events::Aliases:
        return mtx::events::EventType::RoomAliases;
    /// m.room.avatar
    case qml_mtx_events::Avatar:
        return mtx::events::EventType::RoomAvatar;
    /// m.call.invite
    case qml_mtx_events::CallInvite:
        return mtx::events::EventType::CallInvite;
    /// m.call.answer
    case qml_mtx_events::CallAnswer:
        return mtx::events::EventType::CallAnswer;
    /// m.call.hangup
    case qml_mtx_events::CallHangUp:
        return mtx::events::EventType::CallHangUp;
    /// m.call.candidates
    case qml_mtx_events::CallCandidates:
        return mtx::events::EventType::CallCandidates;
    /// m.room.canonical_alias
    case qml_mtx_events::CanonicalAlias:
        return mtx::events::EventType::RoomCanonicalAlias;
    /// m.room.create
    case qml_mtx_events::RoomCreate:
        return mtx::events::EventType::RoomCreate;
    /// m.room.encrypted.
    case qml_mtx_events::Encrypted:
        return mtx::events::EventType::RoomEncrypted;
    /// m.room.encryption.
    case qml_mtx_events::Encryption:
        return mtx::events::EventType::RoomEncryption;
    /// m.room.guest_access
    case qml_mtx_events::RoomGuestAccess:
        return mtx::events::EventType::RoomGuestAccess;
    /// m.room.history_visibility
    case qml_mtx_events::RoomHistoryVisibility:
        return mtx::events::EventType::RoomHistoryVisibility;
    /// m.room.join_rules
    case qml_mtx_events::RoomJoinRules:
        return mtx::events::EventType::RoomJoinRules;
    /// m.room.member
    case qml_mtx_events::Member:
        return mtx::events::EventType::RoomMember;
    /// m.room.name
    case qml_mtx_events::Name:
        return mtx::events::EventType::RoomName;
    /// m.room.power_levels
    case qml_mtx_events::PowerLevels:
        return mtx::events::EventType::RoomPowerLevels;
    /// m.room.tombstone
    case qml_mtx_events::Tombstone:
        return mtx::events::EventType::RoomTombstone;
    /// m.room.topic
    case qml_mtx_events::Topic:
        return mtx::events::EventType::RoomTopic;
    /// m.room.redaction
    case qml_mtx_events::Redaction:
        return mtx::events::EventType::RoomRedaction;
    /// m.room.pinned_events
    case qml_mtx_events::PinnedEvents:
        return mtx::events::EventType::RoomPinnedEvents;
    /// m.widget
    case qml_mtx_events::Widget:
        return mtx::events::EventType::Widget;
    // m.sticker
    case qml_mtx_events::Sticker:
        return mtx::events::EventType::Sticker;
    // m.tag
    case qml_mtx_events::Tag:
        return mtx::events::EventType::Tag;
    // m.space.parent
    case qml_mtx_events::SpaceParent:
        return mtx::events::EventType::SpaceParent;
    // m.space.child
    case qml_mtx_events::SpaceChild:
        return mtx::events::EventType::SpaceChild;
    /// m.room.message
    case qml_mtx_events::AudioMessage:
    case qml_mtx_events::EmoteMessage:
    case qml_mtx_events::FileMessage:
    case qml_mtx_events::ImageMessage:
    case qml_mtx_events::LocationMessage:
    case qml_mtx_events::NoticeMessage:
    case qml_mtx_events::TextMessage:
    case qml_mtx_events::VideoMessage:
    case qml_mtx_events::Redacted:
    case qml_mtx_events::UnknownMessage:
    case qml_mtx_events::KeyVerificationRequest:
    case qml_mtx_events::KeyVerificationStart:
    case qml_mtx_events::KeyVerificationMac:
    case qml_mtx_events::KeyVerificationAccept:
    case qml_mtx_events::KeyVerificationCancel:
    case qml_mtx_events::KeyVerificationKey:
    case qml_mtx_events::KeyVerificationDone:
    case qml_mtx_events::KeyVerificationReady:
        return mtx::events::EventType::RoomMessage;
        //! m.image_pack, currently im.ponies.room_emotes
    case qml_mtx_events::ImagePackInRoom:
        return mtx::events::EventType::ImagePackInRoom;
    //! m.image_pack, currently im.ponies.user_emotes
    case qml_mtx_events::ImagePackInAccountData:
        return mtx::events::EventType::ImagePackInAccountData;
    //! m.image_pack.rooms, currently im.ponies.emote_rooms
    case qml_mtx_events::ImagePackRooms:
        return mtx::events::EventType::ImagePackRooms;
    default:
        return mtx::events::EventType::Unsupported;
    };
}

TimelineModel::TimelineModel(TimelineViewManager *manager, QString room_id, QObject *parent)
  : QAbstractListModel(parent)
  , room_id_(std::move(room_id))
  , events(room_id_.toStdString(), this)
  , manager_(manager)
  , permissions_{room_id_}
{
    this->isEncrypted_ = cache::isRoomEncrypted(room_id_.toStdString());

    auto roomInfo            = cache::singleRoomInfo(room_id_.toStdString());
    this->isSpace_           = roomInfo.is_space;
    this->notification_count = roomInfo.notification_count;
    this->highlight_count    = roomInfo.highlight_count;
    lastMessage_.timestamp   = roomInfo.approximate_last_modification_ts;

    // this connection will simplify adding the plainRoomNameChanged() signal everywhere that it
    // needs to be
    connect(this, &TimelineModel::roomNameChanged, this, &TimelineModel::plainRoomNameChanged);

    connect(
      this,
      &TimelineModel::redactionFailed,
      this,
      [](const QString &msg) { emit ChatPage::instance()->showNotification(msg); },
      Qt::QueuedConnection);

    connect(this, &TimelineModel::dataAtIdChanged, this, [this](const QString &id) {
        relatedEventCacheBuster++;

        auto idx = idToIndex(id);
        if (idx != -1) {
            auto pos = index(idx);
            nhlog::ui()->debug("data changed at {}", id.toStdString());
            emit dataChanged(pos, pos);
        } else {
            nhlog::ui()->debug("id not found {}", id.toStdString());
        }
    });

    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) {
        relatedEventCacheBuster++;
        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));
    });
    connect(&events, &EventStore::pinsChanged, this, &TimelineModel::pinnedMessagesChanged);

    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);
        updateLastMessage();
    });
    connect(&events,
            &EventStore::startDMVerification,
            this,
            [this](const mtx::events::RoomEvent<mtx::events::msg::KeyVerificationRequest> &msg) {
                ChatPage::instance()->receivedRoomDeviceVerificationRequest(msg, this);
            });
    connect(&events, &EventStore::updateFlowEventId, this, [this](std::string event_id) {
        this->updateFlowEventId(std::move(event_id));
    });

    // When a message is sent, check if the current edit/reply relates to that message,
    // and update the event_id so that it points to the sent message and not the pending one.
    connect(
      &events,
      &EventStore::messageSent,
      this,
      [this](const std::string &txn_id, const std::string &event_id) {
          if (edit_.toStdString() == txn_id) {
              edit_ = QString::fromStdString(event_id);
              emit editChanged(edit_);
          }
          if (reply_.toStdString() == txn_id) {
              reply_ = QString::fromStdString(event_id);
              emit replyChanged(reply_);
          }
      },
      Qt::QueuedConnection);

    connect(
      manager_, &TimelineViewManager::initialSyncChanged, &events, &EventStore::enableKeyRequests);

    connect(this, &TimelineModel::encryptionChanged, this, &TimelineModel::trustlevelChanged);
    connect(this, &TimelineModel::roomMemberCountChanged, this, &TimelineModel::trustlevelChanged);
    connect(
      cache::client(), &Cache::verificationStatusChanged, this, &TimelineModel::trustlevelChanged);

    showEventTimer.callOnTimeout(this, &TimelineModel::scrollTimerEvent);

    connect(this, &TimelineModel::newState, this, [this](mtx::responses::StateEvents events_) {
        cache::client()->updateState(room_id_.toStdString(), events_);
        this->syncState({std::move(events_.events)});
    });
}

QHash<int, QByteArray>
TimelineModel::roleNames() const
{
    static QHash<int, QByteArray> roles{
      {Type, "type"},
      {TypeString, "typeString"},
      {IsOnlyEmoji, "isOnlyEmoji"},
      {Body, "body"},
      {FormattedBody, "formattedBody"},
      {PreviousMessageUserId, "previousMessageUserId"},
      {IsSender, "isSender"},
      {UserId, "userId"},
      {UserName, "userName"},
      {PreviousMessageDay, "previousMessageDay"},
      {PreviousMessageIsStateEvent, "previousMessageIsStateEvent"},
      {Day, "day"},
      {Timestamp, "timestamp"},
      {Url, "url"},
      {ThumbnailUrl, "thumbnailUrl"},
      {Duration, "duration"},
      {Blurhash, "blurhash"},
      {Filename, "filename"},
      {Filesize, "filesize"},
      {MimeType, "mimetype"},
      {OriginalHeight, "originalHeight"},
      {OriginalWidth, "originalWidth"},
      {ProportionalHeight, "proportionalHeight"},
      {EventId, "eventId"},
      {State, "status"},
      {IsEdited, "isEdited"},
      {IsEditable, "isEditable"},
      {IsEncrypted, "isEncrypted"},
      {IsStateEvent, "isStateEvent"},
      {Trustlevel, "trustlevel"},
      {EncryptionError, "encryptionError"},
      {ReplyTo, "replyTo"},
      {Reactions, "reactions"},
      {RoomId, "roomId"},
      {RoomName, "roomName"},
      {RoomTopic, "roomTopic"},
      {CallType, "callType"},
      {Dump, "dump"},
      {RelatedEventCacheBuster, "relatedEventCacheBuster"},
    };

    return roles;
}
int
TimelineModel::rowCount(const QModelIndex &parent) const
{
    Q_UNUSED(parent);
    return this->events.size();
}

QVariantMap
TimelineModel::getDump(const QString &eventId, const 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 IsSender:
        return {acc::sender(event) == http::client()->user_id().to_string()};
    case UserId:
        return QVariant(QString::fromStdString(acc::sender(event)));
    case UserName:
        return QVariant(displayName(QString::fromStdString(acc::sender(event))));

    case Day: {
        QDateTime prevDate = origin_server_ts(event);
        prevDate.setTime(QTime());
        return {prevDate.toMSecsSinceEpoch()};
    }
    case Timestamp:
        return QVariant(origin_server_ts(event));
    case Type:
        return {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 {0};
            }
        }

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

        auto ascent = QFontMetrics(UserSettings::instance()->font()).ascent();

        bool isReply = utils::isReply(event);

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

            if (isReply) {
                while (body_.startsWith(QLatin1String("> ")))
                    body_ = body_.right(body_.size() - body_.indexOf('\n') - 1);
                if (body_.startsWith('\n'))
                    body_ = body_.right(body_.size() - 1);
            }
            formattedBody_ = body_.toHtmlEscaped().replace('\n', QLatin1String("<br>"));
        } else {
            if (isReply)
                formattedBody_ = formattedBody_.remove(replyFallback);
        }

        // TODO(Nico): Don't parse html with a regex
        const static QRegularExpression matchIsImg(QStringLiteral("<img [^>]+>"));
        auto itIsImg = matchIsImg.globalMatch(formattedBody_);
        while (itIsImg.hasNext()) {
            // The current <img> tag.
            const QString curImg = itIsImg.next().captured(0);
            // The replacement for the current <img>.
            auto imgReplacement = curImg;

            // Construct image parameters later used by MxcImageProvider.
            QString imgParams;
            if (curImg.contains(QLatin1String("height"))) {
                const static QRegularExpression matchImgHeight(
                  QStringLiteral("height=([\"\']?)(\\d+)([\"\']?)"));
                // Make emoticons twice as high as the font.
                if (curImg.contains(QLatin1String("data-mx-emoticon"))) {
                    imgReplacement =
                      imgReplacement.replace(matchImgHeight, "height=\\1%1\\3").arg(ascent * 2);
                }
                const auto height = matchImgHeight.match(imgReplacement).captured(2).toInt();
                imgParams         = QStringLiteral("?scale&height=%1").arg(height);
            }

            // Replace src in current <img>.
            const static QRegularExpression matchImgUri(QStringLiteral("src=\"mxc://([^\"]*)\""));
            imgReplacement.replace(matchImgUri,
                                   QStringLiteral(R"(src="image://mxcImage/\1%1")").arg(imgParams));
            // Same regex but for single quotes around the src
            const static QRegularExpression matchImgUri2(QStringLiteral("src=\'mxc://([^\']*)\'"));
            imgReplacement.replace(matchImgUri2,
                                   QStringLiteral("src=\'image://mxcImage/\\1%1\'").arg(imgParams));

            // Replace <img> in formattedBody_ with our new <img>.
            formattedBody_.replace(curImg, imgReplacement);
        }

        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 Duration:
        return QVariant(static_cast<qulonglong>(duration(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 OriginalHeight:
        return QVariant(qulonglong{media_height(event)});
    case OriginalWidth:
        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 {prop > 0 ? prop : 1.};
    }
    case EventId: {
        if (auto replaces = relations(event).replaces())
            return QVariant(QString::fromStdString(replaces.value()));
        else
            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 IsEdited:
        return {relations(event).replaces().has_value()};
    case IsEditable:
        return {!is_state_event(event) &&
                mtx::accessors::sender(event) == http::client()->user_id().to_string()};
    case IsEncrypted: {
        auto encrypted_event = events.get(event_id(event), "", false);
        return encrypted_event &&
               std::holds_alternative<mtx::events::EncryptedEvent<mtx::events::msg::Encrypted>>(
                 *encrypted_event);
    }
    case IsStateEvent: {
        return is_state_event(event);
    }

    case Trustlevel: {
        auto encrypted_event = events.get(event_id(event), "", false);
        if (encrypted_event) {
            if (auto encrypted =
                  std::get_if<mtx::events::EncryptedEvent<mtx::events::msg::Encrypted>>(
                    &*encrypted_event)) {
                return olm::calculate_trust(
                  encrypted->sender,
                  MegolmSessionIndex(room_id_.toStdString(), encrypted->content));
            }
        }
        return crypto::Trust::Unverified;
    }

    case EncryptionError:
        return events.decryptionError(event_id(event));

    case ReplyTo:
        return QVariant(QString::fromStdString(relations(event).reply_to().value_or("")));
    case Reactions: {
        auto id = relations(event).replaces().value_or(event_id(event));
        return QVariant::fromValue(events.reactions(id));
    }
    case RoomId:
        return QVariant(room_id_);
    case RoomName:
        return QVariant(
          utils::replaceEmoji(QString::fromStdString(room_name(event)).toHtmlEscaped()));
    case RoomTopic:
        return QVariant(utils::replaceEmoji(
          utils::linkifyMessage(QString::fromStdString(room_topic(event))
                                  .toHtmlEscaped()
                                  .replace(QLatin1String("\n"), QLatin1String("<br>")))));
    case CallType:
        return QVariant(QString::fromStdString(call_type(event)));
    case Dump: {
        QVariantMap m;
        auto names = roleNames();

        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[IsSender], data(event, static_cast<int>(IsSender)));
        m.insert(names[UserId], data(event, static_cast<int>(UserId)));
        m.insert(names[UserName], data(event, static_cast<int>(UserName)));
        m.insert(names[Day], data(event, static_cast<int>(Day)));
        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[Duration], data(event, static_cast<int>(Duration)));
        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[OriginalHeight], data(event, static_cast<int>(OriginalHeight)));
        m.insert(names[OriginalWidth], data(event, static_cast<int>(OriginalWidth)));
        m.insert(names[ProportionalHeight], data(event, static_cast<int>(ProportionalHeight)));
        m.insert(names[EventId], data(event, static_cast<int>(EventId)));
        m.insert(names[State], data(event, static_cast<int>(State)));
        m.insert(names[IsEdited], data(event, static_cast<int>(IsEdited)));
        m.insert(names[IsEditable], data(event, static_cast<int>(IsEditable)));
        m.insert(names[IsEncrypted], data(event, static_cast<int>(IsEncrypted)));
        m.insert(names[IsStateEvent], data(event, static_cast<int>(IsStateEvent)));
        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)));
        m.insert(names[CallType], data(event, static_cast<int>(CallType)));
        m.insert(names[EncryptionError], data(event, static_cast<int>(EncryptionError)));

        return QVariant(m);
    }
    case RelatedEventCacheBuster:
        return relatedEventCacheBuster;
    default:
        return {};
    }
}

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 {};

    // HACK(Nico): fetchMore likes to break with dynamically sized delegates and reuseItems
    if (index.row() + 1 == rowCount() && !m_paginationInProgress)
        const_cast<TimelineModel *>(this)->fetchMore(index);

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

    if (!event)
        return "";

    if (role == PreviousMessageDay || role == PreviousMessageUserId ||
        role == PreviousMessageIsStateEvent) {
        int prevIdx = rowCount() - index.row() - 2;
        if (prevIdx < 0)
            return {};
        auto tempEv = events.get(prevIdx);
        if (!tempEv)
            return {};
        if (role == PreviousMessageUserId)
            return data(*tempEv, UserId);
        else if (role == PreviousMessageDay)
            return data(*tempEv, Day);
        else
            return data(*tempEv, IsStateEvent);
    }

    return data(*event, role);
}

QVariant
TimelineModel::dataById(const QString &id, int role, const QString &relatedTo)
{
    if (auto event = events.get(id.toStdString(), relatedTo.toStdString()))
        return data(*event, role);
    return {};
}

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::sync(const mtx::responses::JoinedRoom &room)
{
    this->syncState(room.state);
    this->addEvents(room.timeline);

    if (room.unread_notifications.highlight_count != highlight_count ||
        room.unread_notifications.notification_count != notification_count) {
        notification_count = room.unread_notifications.notification_count;
        highlight_count    = room.unread_notifications.highlight_count;
        emit notificationsChanged();
    }
}

void
TimelineModel::syncState(const mtx::responses::State &s)
{
    using namespace mtx::events;

    for (const auto &e : s.events) {
        if (std::holds_alternative<StateEvent<state::Avatar>>(e))
            emit roomAvatarUrlChanged();
        else if (std::holds_alternative<StateEvent<state::Name>>(e))
            emit roomNameChanged();
        else if (std::holds_alternative<StateEvent<state::Topic>>(e))
            emit roomTopicChanged();
        else if (std::holds_alternative<StateEvent<state::PinnedEvents>>(e))
            emit pinnedMessagesChanged();
        else if (std::holds_alternative<StateEvent<state::Widget>>(e))
            emit widgetLinksChanged();
        else if (std::holds_alternative<StateEvent<state::PowerLevels>>(e)) {
            permissions_.invalidate();
            emit permissionsChanged();
        } else if (std::holds_alternative<StateEvent<state::Member>>(e)) {
            emit roomAvatarUrlChanged();
            emit roomNameChanged();
            emit roomMemberCountChanged();

            if (roomMemberCount() <= 2) {
                emit isDirectChanged();
                emit directChatOtherUserIdChanged();
            }
        } else if (std::holds_alternative<StateEvent<state::Encryption>>(e)) {
            this->isEncrypted_ = cache::isRoomEncrypted(room_id_.toStdString());
            emit encryptionChanged();
        }
    }
}

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

    events.handleSync(timeline);

    using namespace mtx::events;

    for (auto e : timeline.events) {
        if (auto encryptedEvent = std::get_if<EncryptedEvent<msg::Encrypted>>(&e)) {
            MegolmSessionIndex index(room_id_.toStdString(), encryptedEvent->content);

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

        if (std::holds_alternative<RoomEvent<msg::CallCandidates>>(e) ||
            std::holds_alternative<RoomEvent<msg::CallInvite>>(e) ||
            std::holds_alternative<RoomEvent<msg::CallAnswer>>(e) ||
            std::holds_alternative<RoomEvent<msg::CallHangUp>>(e))
            std::visit(
              [this](auto &event) {
                  event.room_id = room_id_.toStdString();
                  if constexpr (std::is_same_v<std::decay_t<decltype(event)>,
                                               RoomEvent<msg::CallAnswer>> ||
                                std::is_same_v<std::decay_t<decltype(event)>,
                                               RoomEvent<msg::CallHangUp>>)
                      emit newCallEvent(event);
                  else {
                      if (event.sender != http::client()->user_id().to_string())
                          emit newCallEvent(event);
                  }
              },
              e);
        else if (std::holds_alternative<StateEvent<state::Avatar>>(e))
            emit roomAvatarUrlChanged();
        else if (std::holds_alternative<StateEvent<state::Name>>(e))
            emit roomNameChanged();
        else if (std::holds_alternative<StateEvent<state::Topic>>(e))
            emit roomTopicChanged();
        else if (std::holds_alternative<StateEvent<state::PinnedEvents>>(e))
            emit pinnedMessagesChanged();
        else if (std::holds_alternative<StateEvent<state::Widget>>(e))
            emit widgetLinksChanged();
        else if (std::holds_alternative<StateEvent<state::PowerLevels>>(e)) {
            permissions_.invalidate();
            emit permissionsChanged();
        } else if (std::holds_alternative<StateEvent<state::Member>>(e)) {
            emit roomAvatarUrlChanged();
            emit roomNameChanged();
            emit roomMemberCountChanged();
        } else if (std::holds_alternative<StateEvent<state::Encryption>>(e)) {
            this->isEncrypted_ = cache::isRoomEncrypted(room_id_.toStdString());
            emit encryptionChanged();
        }
    }
    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;
}

auto
isMessage(const mtx::events::RoomEvent<mtx::events::msg::CallInvite> &)
{
    return true;