#pragma once

#include <string>
#include <vector>

#include <QObject>

#include "mtx/events/voip.hpp"

typedef struct _GstElement GstElement;

class WebRTCSession : public QObject
{
        Q_OBJECT

public:
        enum class State {
          ICEFAILED,
          DISCONNECTED,
          INITIATING,
          INITIATED,
          OFFERSENT,
          ANSWERSENT,
          CONNECTING,
          CONNECTED
        };

        static WebRTCSession& instance()
        {
          static WebRTCSession instance;
          return instance;
        }

        bool init(std::string *errorMessage = nullptr);
        State state() const {return state_;} 

        bool createOffer();
        bool acceptOffer(const std::string &sdp);
        bool acceptAnswer(const std::string &sdp);
        void acceptICECandidates(const std::vector<mtx::events::msg::CallCandidates::Candidate>&);

        bool toggleMuteAudioSrc(bool &isMuted);
        void end();

        void setStunServer(const std::string &stunServer) {stunServer_ = stunServer;}
        void setTurnServers(const std::vector<std::string> &uris) {turnServers_ = uris;}

signals:
        void offerCreated(const std::string &sdp, const std::vector<mtx::events::msg::CallCandidates::Candidate>&);
        void answerCreated(const std::string &sdp, const std::vector<mtx::events::msg::CallCandidates::Candidate>&);
        void newICECandidate(const mtx::events::msg::CallCandidates::Candidate&);
        void stateChanged(WebRTCSession::State); // explicit qualifier necessary for Qt

private slots:
        void setState(State state) {state_ = state;}

private:
        WebRTCSession();

        bool initialised_ = false;
        State state_ = State::DISCONNECTED;
        GstElement *pipe_ = nullptr;
        GstElement *webrtc_ = nullptr;
        std::string stunServer_;
        std::vector<std::string> turnServers_;

        bool startPipeline(int opusPayloadType);
        bool createPipeline(int opusPayloadType);

public:
        WebRTCSession(WebRTCSession const&) = delete;
        void operator=(WebRTCSession const&) = delete;
};