#include "player.h"

// HOLY GRAIL
// https://doc.qt.io/qt-6/qaudiobufferoutput.htmli t

Player::Player(QObject *parent) : QObject(parent),
    player(this), output(this), manager(this)
{
    QObject::connect(&this->player, &QMediaPlayer::mediaStatusChanged, this, [this] () {
        const QMediaPlayer::MediaStatus status = this->player.mediaStatus();
        if (status == QMediaPlayer::NoMedia)
        {
            qDebug("Player::Player(): NoMedia");
            this->stop();
        }
        else if (status == QMediaPlayer::BufferingMedia || status == QMediaPlayer::LoadingMedia)
        {
            qDebug("Player::Player() loadingChanged");
            this->m_loading = true;
            emit this->loadingChanged();
        }
        else if (status == QMediaPlayer::EndOfMedia)
        {
            qDebug("Player::Player() playingChanged");
            emit this->playingChanged();
        }
        else
        {
            this->m_loading = false;
            emit this->loadingChanged();
            if (!this->m_initialLoadFinished)
            {
                this->m_initialLoadFinished = true;
                this->play();
            }
        }
    });

    QObject::connect(&this->player, &QMediaPlayer::positionChanged, this, [this] () {
        this->m_position = this->player.position();
        emit this->positionChanged();
    });

    QObject::connect(&this->player, &QMediaPlayer::bufferProgressChanged, this, [this] () {
        this->m_buffered = this->player.bufferedTimeRange().latestTime() / this->m_duration;
        emit this->bufferedChanged();
    });

    QObject::connect(&this->player, &QMediaPlayer::errorOccurred, this, [this] () {
        this->m_failed = true;
        qDebug("Player::Player() failedChanged");
        emit this->failedChanged();
    });

    QObject::connect(&this->player, &QMediaPlayer::playbackStateChanged, this, [this] () {
        qDebug("Player::Player() playingChanged");
        emit this->playingChanged();
    });

    QObject::connect(&this->output, &QAudioOutput::volumeChanged, this, [this] () {
        emit this->volumeChanged();
    });

    this->output.setVolume(0.2);
    this->player.setAudioOutput(&this->output);

    qDebug("Player::Player(): Constructed");
}

Player::~Player()
{
    qDebug("Player::~Player(): Destructed");
}


// ********
//   Read
// ********

bool Player::playing() const
{
    return this->player.playbackState() == QMediaPlayer::PlayingState;
}

float Player::volume() const
{
    return this->output.volume();
}

// *********
//   Write
// *********

void Player::setVolume(float newVolume)
{
    this->output.setVolume(newVolume);
}

void Player::setPosition(float newPosition)
{
    this->player.setPosition(newPosition);
}



// ***********
//   Methods
// ***********

void Player::loadVideo(QString id)
{
    if (this->m_active)
    {
        this->unloadVideo();
    }
    QNetworkReply* reply = this->manager.get(QNetworkRequest(QUrl("https://youvideo.nonamesoft.xyz/youvideo/video/" + id)));

    QEventLoop loop(this);
    QObject::connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
    loop.exec();

    if (reply->error() != QNetworkReply::NoError)
    {
        qDebug() << "Player::loadVideo(): Video " << id << " doesn't exist!\n";
        delete reply;
        return;
    }

    const QJsonDocument data = QJsonDocument::fromJson(reply->readAll());

    this->player.setSource(QUrl("https://youvideo.nonamesoft.xyz/youvideo/api/videofile/with_extension/" + id + data ["extension"].toString()));

    this->m_title = data["name"].toString();
    emit this->titleChanged();

    this->m_description = data["description"].toString();
    emit this->descriptionChanged();

    this->m_id = id;
    emit this->idChanged();

    this->m_initialLoadFinished = false;

    this->m_active = true;
    emit this->activeChanged();

    this->m_duration = data["metadata"]["duration"].toDouble() * 1000;
    emit this->durationChanged();

    this->m_position = 0;
    emit this->positionChanged();

    this->m_buffered = 0;
    emit this->bufferedChanged();

    this->m_loading = true;
    emit this->loadingChanged();

    this->m_failed = false;
    emit this->failedChanged();

    qDebug() << "Player::loadVideo(): Loaded video https://youvideo.nonamesoft.xyz/youvideo/api/videofile/with_extension/" + id + data ["extension"].toString();

    delete reply;
}

void Player::unloadVideo() {
    qDebug("Player::unloadVideo(): Video unloaded");
    this->player.setSource(QUrl(""));
    this->player.stop();
    this->m_failed = false;
    emit this->activeChanged();
    this->m_active = false;
    emit this->activeChanged();
}

void Player::play()
{
    if (!this->m_active || this->m_loading)
    {
        return;
    }    
    this->player.play();
}

void Player::pause()
{
    if (!this->m_active || this->m_loading)
    {
        return;
    }
    this->player.pause();
}

void Player::stop()
{
    if (!this->m_active || this->m_loading)
    {
        return;
    }
    this->player.stop();
    this->unloadVideo();
}