TimelineModel.cpp

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

#include "TimelineModel.h"

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

#include <QCache>
#include <QClipboard>
#include <QDesktopServices>
#include <QFileDialog>
#include <QGuiApplication>
#include <QMimeDatabase>
#include <QRegularExpression>
#include <QSettings>
#include <QStandardPaths>

#include "Cache_p.h"
#include "ChatPage.h"
#include "Config.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"

Q_DECLARE_METATYPE(QModelIndex)

namespace std {
inline uint
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)
        {
                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::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
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.sticker
        case qml_mtx_events::Sticker:
                return mtx::events::EventType::Sticker;
        // m.tag
        case qml_mtx_events::Tag:
                return mtx::events::EventType::Tag;
        /// 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;
        default:
                return mtx::events::EventType::Unsupported;
        };
}

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); });
        connect(&events,
                &EventStore::startDMVerification,
                this,
                [this](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(event_id);
        });

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

QHash<int, QByteArray>
TimelineModel::roleNames() const
{
        return {
          {Type, "type"},
          {TypeString, "typeString"},
          {IsOnlyEmoji, "isOnlyEmoji"},
          {Body, "body"},
          {FormattedBody, "formattedBody"},
          {PreviousMessageUserId, "previousMessageUserId"},
          {IsSender, "isSender"},
          {UserId, "userId"},
          {UserName, "userName"},
          {PreviousMessageDay, "previousMessageDay"},
          {Day, "day"},
          {Timestamp, "timestamp"},
          {Url, "url"},
          {ThumbnailUrl, "thumbnailUrl"},
          {Blurhash, "blurhash"},
          {Filename, "filename"},
          {Filesize, "filesize"},
          {MimeType, "mimetype"},
          {Height, "height"},
          {Width, "width"},
          {ProportionalHeight, "proportionalHeight"},
          {Id, "id"},
          {State, "state"},
          {IsEdited, "isEdited"},
          {IsEditable, "isEditable"},
          {IsEncrypted, "isEncrypted"},
          {Trustlevel, "trustlevel"},
          {IsRoomEncrypted, "isRoomEncrypted"},
          {ReplyTo, "replyTo"},
          {Reactions, "reactions"},
          {RoomId, "roomId"},
          {RoomName, "roomName"},
          {RoomTopic, "roomTopic"},
          {CallType, "callType"},
          {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 IsSender:
                return QVariant(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 QVariant(prevDate.toMSecsSinceEpoch());
        }
        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)).toHtmlEscaped()));
        case FormattedBody: {
                const static QRegularExpression replyFallback(
                  "<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("> "))
                                        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);
                }

                // TODO(Nico): Don't parse html with a regex
                const static QRegularExpression matchImgUri(
                  "(<img [^>]*)src=\"mxc://([^\"]*)\"([^>]*>)");
                formattedBody_.replace(matchImgUri, "\\1 src=\"image://mxcImage/\\2\"\\3");
                const static QRegularExpression matchEmoticonHeight(
                  "(<img data-mx-emoticon [^>]*)height=\"([^\"]*)\"([^>]*>)");
                formattedBody_.replace(matchEmoticonHeight,
                                       QString("\\1 height=\"%1\"\\3").arg(ascent));

                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: {
                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 QVariant(relations(event).replaces().has_value());
        case IsEditable:
                return QVariant(!is_state_event(event) &&
                                mtx::accessors::sender(event) ==
                                  http::client()->user_id().to_string() &&
                                !event_id(event).empty() && event_id(event).front() == '$');
        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 Trustlevel: {
                auto id              = event_id(event);
                auto encrypted_event = events.get(id, id, 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,
                                                            encrypted->content.sender_key);
                        }
                }
                return crypto::Trust::Unverified;
        }

        case IsRoomEncrypted: {
                return cache::isRoomEncrypted(room_id_.toStdString());
        }
        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("\n", "<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[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[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[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)));
                m.insert(names[CallType], data(event, static_cast<int>(CallType)));

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

        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::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::Topic>>(e)) {
                        permissions_.invalidate();
                        emit permissionsChanged();
                } else if (std::holds_alternative<StateEvent<state::Member>>(e)) {
                        emit roomAvatarUrlChanged();
                        emit roomNameChanged();
                }
        }
}

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;
                        index.room_id    = room_id_.toStdString();
                        index.session_id = encryptedEvent->content.session_id;
                        index.sender_key = encryptedEvent->content.sender_key;

                        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::PowerLevels>>(e)) {
                        permissions_.invalidate();
                        emit permissionsChanged();
                } else if (std::holds_alternative<StateEvent<state::Member>>(e)) {
                        emit roomAvatarUrlChanged();
                        emit roomNameChanged();
                }
        }
        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;
}

auto
isMessage(const mtx::events::RoomEvent<mtx::events::msg::CallAnswer> &)
{
        return true;
}
auto
isMessage(const mtx::events::RoomEvent<mtx::events::msg::CallHangUp> &)
{
        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()),
                  cache::displayName(room_id_,
                                     QString::fromStdString(mtx::accessors::sender(*event))));
                emit manager_->updateRoomsLastMessage(room_id_, description);
                return;
        }
}

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

        if (!ChatPage::instance()->isActiveWindow())
                return;

        if (!currentId.startsWith("m")) {
                auto oldReadIndex =
                  cache::getEventIndex(roomId().toStdString(), currentReadId.toStdString());
                auto nextEventIndexAndId =
                  cache::lastInvisibleEventAfter(roomId().toStdString(), currentId.toStdString());

                if (nextEventIndexAndId &&
                    (!oldReadIndex || *oldReadIndex < nextEventIndexAndId->first)) {
                        readEvent(nextEventIndexAndId->second);
                        currentReadId = QString::fromStdString(nextEventIndexAndId->second);
                }
        }
}

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);
}

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::forwardMessage(QString eventId, QString roomId)
{
        auto e = events.get(eventId.toStdString(), "");
        if (!e)
                return;

        emit forwardToRoom(e, roomId);
}

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)
{
        UserProfile *userProfile = new UserProfile(room_id_, userid, manager_, this);
        connect(
          this, &TimelineModel::roomAvatarUrlChanged, userProfile, &UserProfile::updateAvatarUrl);
        emit manager_->openProfile(userProfile);
}

void
TimelineModel::openRoomSettings()
{