squeezelite-esp32/components/spotify/cspot/src/SpircController.cpp

#include "SpircController.h"
#include "ConfigJSON.h"
#include "Logger.h"
#include "SpotifyTrack.h"

SpircController::SpircController(std::shared_ptr<MercuryManager> manager,
                                 std::string username,
                                 std::shared_ptr<AudioSink> audioSink) {

    this->manager = manager;
    this->player = std::make_unique<Player>(manager, audioSink);
    this->state = std::make_unique<PlayerState>(manager->timeProvider);
    this->username = username;

    player->endOfFileCallback = [=]() {
        if (state->nextTrack()) {
            loadTrack();
        }
    };

    player->setVolume(configMan->volume);
    subscribe();
}

void SpircController::subscribe() {
    mercuryCallback responseLambda = [=](std::unique_ptr<MercuryResponse> res) {
        // this->trackInformationCallback(std::move(res));
        sendCmd(MessageType_kMessageTypeHello);
        CSPOT_LOG(debug, "Sent kMessageTypeHello!");
    };
    mercuryCallback subLambda = [=](std::unique_ptr<MercuryResponse> res) {
        this->handleFrame(res->parts[0]);
    };

    manager->execute(MercuryType::SUB,
                     "hm://remote/user/" + this->username + "/", responseLambda,
                     subLambda);
}

void SpircController::setPause(bool isPaused, bool notifyPlayer) {
    sendEvent(CSpotEventType::PLAY_PAUSE, isPaused);
    if (isPaused) {
        CSPOT_LOG(debug, "External pause command");
        if (notifyPlayer) player->pause();
        state->setPlaybackState(PlaybackState::Paused);
    } else {
        CSPOT_LOG(debug, "External play command");
        if (notifyPlayer) player->play();
        state->setPlaybackState(PlaybackState::Playing);
    }
    notify();
}

void SpircController::disconnect(void) {
    player->cancelCurrentTrack();
    state->setActive(false);
    notify();
    // Send the event at the end at it might be a last gasp
    sendEvent(CSpotEventType::DISC);    
}

void SpircController::playToggle() {
    if (state->innerFrame.state.status == PlayStatus_kPlayStatusPause) {
        setPause(false);
    } else {
        setPause(true);
    }
}

void SpircController::adjustVolume(int by) {
    if (state->innerFrame.device_state.has_volume) {
        int volume = state->innerFrame.device_state.volume + by;
        if (volume < 0) volume = 0;
        else if (volume > MAX_VOLUME) volume = MAX_VOLUME;
        setVolume(volume);
    }
}

void SpircController::setVolume(int volume) {
    setRemoteVolume(volume);
    player->setVolume(volume);
    configMan->save();
}

void SpircController::setRemoteVolume(int volume) {
    state->setVolume(volume);
    notify();
}

void SpircController::nextSong() {
    if (state->nextTrack()) {
        loadTrack();
    } else {
        player->cancelCurrentTrack();
    }
    notify();
}

void SpircController::prevSong() {
    state->prevTrack();
    loadTrack();
    notify();
}

void SpircController::handleFrame(std::vector<uint8_t> &data) {
    pb_release(Frame_fields, state->remoteFrame);
    pbDecode(state->remoteFrame, Frame_fields, data);

    switch (state->remoteFrame.typ) {
    case MessageType_kMessageTypeNotify: {
        CSPOT_LOG(debug, "Notify frame");
        // Pause the playback if another player took control
        if (state->isActive() &&
            state->remoteFrame.device_state.is_active) {
            disconnect();
        }
        break;
    }
    case MessageType_kMessageTypeSeek: {
        CSPOT_LOG(debug, "Seek command");
        sendEvent(CSpotEventType::SEEK, (int) state->remoteFrame.position);
        state->updatePositionMs(state->remoteFrame.position);
        this->player->seekMs(state->remoteFrame.position);
        notify();
        break;
    }
    case MessageType_kMessageTypeVolume:
        sendEvent(CSpotEventType::VOLUME, (int) state->remoteFrame.volume);
        setVolume(state->remoteFrame.volume);
        break;
    case MessageType_kMessageTypePause:
        setPause(true);
        break;
    case MessageType_kMessageTypePlay:
        setPause(false);
        break;
    case MessageType_kMessageTypeNext:
        sendEvent(CSpotEventType::NEXT);
        nextSong();
        break;
    case MessageType_kMessageTypePrev:
        sendEvent(CSpotEventType::PREV);
        prevSong();
        break;
    case MessageType_kMessageTypeLoad: {
        CSPOT_LOG(debug, "Load frame!");

        state->setActive(true);

        // Every sane person on the planet would expect std::move to work here.
        // And it does... on every single platform EXCEPT for ESP32 for some
        // reason. For which it corrupts memory and makes printf fail. so yeah.
        // its cursed.
        state->updateTracks();

        // bool isPaused = (state->remoteFrame.state->status.value() ==
        // PlayStatus::kPlayStatusPlay) ? false : true;
        loadTrack(state->remoteFrame.state.position_ms, false);
        state->updatePositionMs(state->remoteFrame.state.position_ms);

        this->notify();
        break;
    }
    case MessageType_kMessageTypeReplace: {
        CSPOT_LOG(debug, "Got replace frame!");
        break;
    }
    case MessageType_kMessageTypeShuffle: {
        CSPOT_LOG(debug, "Got shuffle frame");
        state->setShuffle(state->remoteFrame.state.shuffle);
        this->notify();
        break;
    }
    case MessageType_kMessageTypeRepeat: {
        CSPOT_LOG(debug, "Got repeat frame");
        state->setRepeat(state->remoteFrame.state.repeat);
        this->notify();
        break;
    }
    default:
        break;
    }
}

void SpircController::loadTrack(uint32_t position_ms, bool isPaused) {
    sendEvent(CSpotEventType::LOAD, (int) position_ms);
    state->setPlaybackState(PlaybackState::Loading);
    std::function<void()> loadedLambda = [=]() {
        // Loading finished, notify that playback started
        setPause(isPaused, false);
    };

    player->handleLoad(state->getCurrentTrack(), loadedLambda, position_ms,
                       isPaused);
}

void SpircController::notify() {
    this->sendCmd(MessageType_kMessageTypeNotify);
}

void SpircController::sendEvent(CSpotEventType eventType, std::variant<TrackInfo, int, bool> data) {
    if (eventHandler != nullptr) {
        CSpotEvent event = {
            .eventType = eventType,
            .data = data,
        };

        eventHandler(event);
    }
}

void SpircController::setEventHandler(cspotEventHandler callback) {
    this->eventHandler = callback;

    player->trackChanged = ([this](TrackInfo &track) {
            TrackInfo info;
            info.album = track.album;
            info.artist = track.artist;
            info.imageUrl = track.imageUrl;
            info.name = track.name;
            info.duration = track.duration;
            this->sendEvent(CSpotEventType::TRACK_INFO, info);
    });
}

void SpircController::stopPlayer() { this->player->stop(); }

void SpircController::sendCmd(MessageType typ) {
    // Serialize current player state
    auto encodedFrame = state->encodeCurrentFrame(typ);

    mercuryCallback responseLambda = [=](std::unique_ptr<MercuryResponse> res) {
    };
    auto parts = mercuryParts({encodedFrame});
    this->manager->execute(MercuryType::SEND,
                           "hm://remote/user/" + this->username + "/",
                           responseLambda, parts);
}