CallManager.h

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

#pragma once

#include <string>
#include <vector>

#include <QMediaPlayer>
#include <QObject>
#include <QString>
#include <QTimer>

#include "CallDevices.h"
#include "WebRTCSession.h"
#include "mtx/events/collections.hpp"
#include "mtx/events/voip.hpp"

namespace mtx::responses {
struct TurnServer;
}

class QStringList;
class QUrl;

class CallManager : public QObject
{
        Q_OBJECT
        Q_PROPERTY(bool haveCallInvite READ haveCallInvite NOTIFY newInviteState)
        Q_PROPERTY(bool isOnCall READ isOnCall NOTIFY newCallState)
        Q_PROPERTY(webrtc::CallType callType READ callType NOTIFY newInviteState)
        Q_PROPERTY(webrtc::State callState READ callState NOTIFY newCallState)
        Q_PROPERTY(QString callParty READ callParty NOTIFY newInviteState)
        Q_PROPERTY(QString callPartyDisplayName READ callPartyDisplayName NOTIFY newInviteState)
        Q_PROPERTY(QString callPartyAvatarUrl READ callPartyAvatarUrl NOTIFY newInviteState)
        Q_PROPERTY(bool isMicMuted READ isMicMuted NOTIFY micMuteChanged)
        Q_PROPERTY(bool haveLocalPiP READ haveLocalPiP NOTIFY newCallState)
        Q_PROPERTY(QStringList mics READ mics NOTIFY devicesChanged)
        Q_PROPERTY(QStringList cameras READ cameras NOTIFY devicesChanged)
        Q_PROPERTY(bool callsSupported READ callsSupported CONSTANT)
        Q_PROPERTY(bool screenShareSupported READ screenShareSupported CONSTANT)

public:
        CallManager(QObject *);

        bool haveCallInvite() const { return haveCallInvite_; }
        bool isOnCall() const { return session_.state() != webrtc::State::DISCONNECTED; }
        webrtc::CallType callType() const { return callType_; }
        webrtc::State callState() const { return session_.state(); }
        QString callParty() const { return callParty_; }
        QString callPartyDisplayName() const { return callPartyDisplayName_; }
        QString callPartyAvatarUrl() const { return callPartyAvatarUrl_; }
        bool isMicMuted() const { return session_.isMicMuted(); }
        bool haveLocalPiP() const { return session_.haveLocalPiP(); }
        QStringList mics() const { return devices(false); }
        QStringList cameras() const { return devices(true); }
        void refreshTurnServer();

        static bool callsSupported();
        static bool screenShareSupported();

public slots:
        void sendInvite(const QString &roomid, webrtc::CallType, unsigned int windowIndex = 0);
        void syncEvent(const mtx::events::collections::TimelineEvents &event);
        void toggleMicMute();
        void toggleLocalPiP() { session_.toggleLocalPiP(); }
        void acceptInvite();
        void hangUp(
          mtx::events::msg::CallHangUp::Reason = mtx::events::msg::CallHangUp::Reason::User);
        QStringList windowList();
        void previewWindow(unsigned int windowIndex) const;

signals:
        void newMessage(const QString &roomid, const mtx::events::msg::CallInvite &);
        void newMessage(const QString &roomid, const mtx::events::msg::CallCandidates &);
        void newMessage(const QString &roomid, const mtx::events::msg::CallAnswer &);
        void newMessage(const QString &roomid, const mtx::events::msg::CallHangUp &);
        void newInviteState();
        void newCallState();
        void micMuteChanged();
        void devicesChanged();
        void turnServerRetrieved(const mtx::responses::TurnServer &);

private slots:
        void retrieveTurnServer();

private:
        WebRTCSession &session_;
        QString roomid_;
        QString callParty_;
        QString callPartyDisplayName_;
        QString callPartyAvatarUrl_;
        std::string callid_;
        const uint32_t timeoutms_  = 120000;
        webrtc::CallType callType_ = webrtc::CallType::VOICE;
        bool haveCallInvite_       = false;
        std::string inviteSDP_;
        std::vector<mtx::events::msg::CallCandidates::Candidate> remoteICECandidates_;
        std::vector<std::string> turnURIs_;
        QTimer turnServerTimer_;
        QMediaPlayer player_;
        std::vector<std::pair<QString, uint32_t>> windows_;

        template<typename T>
        bool handleEvent(const mtx::events::collections::TimelineEvents &event);
        void handleEvent(const mtx::events::RoomEvent<mtx::events::msg::CallInvite> &);
        void handleEvent(const mtx::events::RoomEvent<mtx::events::msg::CallCandidates> &);
        void handleEvent(const mtx::events::RoomEvent<mtx::events::msg::CallAnswer> &);
        void handleEvent(const mtx::events::RoomEvent<mtx::events::msg::CallHangUp> &);
        void answerInvite(const mtx::events::msg::CallInvite &, bool isVideo);
        void generateCallID();
        QStringList devices(bool isVideo) const;
        void clear();
        void endCall();
        void playRingtone(const QUrl &ringtone, bool repeat);
        void stopRingtone();
};