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#include "multivideoplayer.h"
#include <QtWidgets>
#include <QVideoSurfaceFormat>

MultiVideoPlayer::MultiVideoPlayer(QStringList list)
{
    const QRect screenGeometry = QApplication::desktop()->screenGeometry(this);
    int i, num = 0;
    resize(screenGeometry.width(), screenGeometry.height());

    playerList = new QList<QMediaPlayer*>();
    videoList = new QList<QVideoWidget*>();
    hLayoutList = new QList<QHBoxLayout*>();
    multiPlayList = new QList<QMediaPlaylist*>();
    urlList = list;

    exitButton = new QPushButton(tr("Exit"));
    connect(exitButton, &QAbstractButton::clicked, this, &MultiVideoPlayer::exit);

    if(urlList.count() > 0){
        num = qSqrt(urlList.count());
        if(qreal(num) < qSqrt(list.count())){
            num++;
        }
    }

    for(i=0; i<num; i++){
        QHBoxLayout *layout = new QHBoxLayout;
        hLayoutList->append(layout);
    }

    for(i=0; i<urlList.count(); i++){
        QMediaPlayer *player = new QMediaPlayer(this, QMediaPlayer::VideoSurface);
        playerList->append(player);
        QVideoWidget *video = new QVideoWidget();
        videoList->append(video);
        QMediaPlaylist *playlist = new QMediaPlaylist(this);
        multiPlayList->append(playlist);
        QString str = list.at(i);
        QFile f(urlList.at(i));
        QUrl u(str);

        if(f.exists()){
            playlist->addMedia(QUrl::fromLocalFile(str));
        }else if(u.isValid()){
            playlist->addMedia(u);
        }
        playlist->setCurrentIndex(1);
        playlist->setPlaybackMode(QMediaPlaylist::Loop);
        player->setPlaylist(playlist);
        QHBoxLayout *layout = hLayoutList->value(i/num);
        if(layout){
            layout->addWidget(video);
            layout->setMargin(0);
            layout->setSpacing(0);
        }
    }

    QBoxLayout *mainLayout = new QVBoxLayout();
    mainLayout->setMargin(0);
    mainLayout->setSpacing(0);
    for(i=0; i<hLayoutList->count(); i++){
        QWidget *widget = new QWidget();
        widget->setLayout(hLayoutList->value(i));
        mainLayout->addWidget(widget);
    }
    mainLayout->addWidget(exitButton);

    QWidget *widget = new QWidget();
    widget->setLayout(mainLayout);

    setCentralWidget(widget);
    setWindowState(Qt::WindowMaximized);
    setWindowFlags(Qt::FramelessWindowHint);

    QPalette palette = QWidget::palette();
    palette.setColor(QPalette::Window, Qt::black);
    setPalette(palette);
}

MultiVideoPlayer::~MultiVideoPlayer()
{
}

void MultiVideoPlayer::play()
{
    for(int i=0; i<urlList.count(); i++){
        QVideoWidget *video = videoList->value(i);
        QMediaPlayer *player = playerList->value(i);
        if(video && player){
            player->setVideoOutput(video);
            video->show();
            player->play();
        }
    }
}

void MultiVideoPlayer::mouseDoubleClickEvent(QMouseEvent *e)
{
    if(e->button() == Qt::LeftButton){
        if(isFullScreen()){
            showNormal();
        }else {
            showFullScreen();
        }
    }
}

void MultiVideoPlayer::mouseReleaseEvent(QMouseEvent *e)
{
    if(e->button() == Qt::LeftButton){
    }
}

void MultiVideoPlayer::keyReleaseEvent(QKeyEvent *e)
{
    switch(e->key())
    {
        case Qt::Key_VolumeUp:
        case Qt::Key_Up:
            break;
        case Qt::Key_VolumeDown:
        case Qt::Key_Down:
            break;
    }
}

void MultiVideoPlayer::exit()
{
    qApp->exit(0);
}