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#include "videoplayer.h"

#include "videoitem.h"

#include <QtMultimedia>

#ifndef QT_NO_OPENGL

# include <QtOpenGL/QGLWidget>

#endif

VideoPlayer::VideoPlayer(QWidget *parent, Qt::WindowFlags flags)

    : QWidget(parent, flags)

    , videoItem(0)

    , playButton(0)

    , positionSlider(0)

{

    connect(&movie, SIGNAL(stateChanged(QMovie::MovieState)),

            this, SLOT(movieStateChanged(QMovie::MovieState)));

    connect(&movie, SIGNAL(frameChanged(int)),

            this, SLOT(frameChanged(int)));

    videoItem = new VideoItem;

    QGraphicsScene *scene = new QGraphicsScene(this);

    QGraphicsView *graphicsView = new QGraphicsView(scene);

#ifndef QT_NO_OPENGL

    graphicsView->setViewport(new QGLWidget);

#endif

    scene->addItem(videoItem);

    QSlider *rotateSlider = new QSlider(Qt::Horizontal);

    rotateSlider->setRange(-180,  180);

    rotateSlider->setValue(0);

    connect(rotateSlider, SIGNAL(valueChanged(int)),

            this, SLOT(rotateVideo(int)));

    QAbstractButton *openButton = new QPushButton(tr("Open..."));

    connect(openButton, SIGNAL(clicked()), this, SLOT(openFile()));

    playButton = new QPushButton;

    playButton->setEnabled(false);

    playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));

    connect(playButton, SIGNAL(clicked()),

            this, SLOT(play()));

    positionSlider = new QSlider(Qt::Horizontal);

    positionSlider->setRange(0, 0);

    connect(positionSlider, SIGNAL(sliderMoved(int)),

            this, SLOT(setPosition(int)));

    connect(&movie, SIGNAL(frameChanged(int)),

            positionSlider, SLOT(setValue(int)));

    QBoxLayout *controlLayout = new QHBoxLayout;

    controlLayout->setMargin(0);

    controlLayout->addWidget(openButton);

    controlLayout->addWidget(playButton);

    controlLayout->addWidget(positionSlider);

    QBoxLayout *layout = new QVBoxLayout;

    layout->addWidget(graphicsView);

    layout->addWidget(rotateSlider);

    layout->addLayout(controlLayout);

    setLayout(layout);

}

VideoPlayer::~VideoPlayer()

{

}

void VideoPlayer::openFile()

{

    QString fileName = QFileDialog::getOpenFileName(this, tr("Open Movie"));

    if (!fileName.isEmpty()) {

        videoItem->stop();

        movie.setFileName(fileName);

        playButton->setEnabled(true);

        positionSlider->setMaximum(movie.frameCount());

        movie.jumpToFrame(0);

    }

}

void VideoPlayer::play()

{

    switch(movie.state()) {

    case QMovie::NotRunning:

        movie.start();

        break;

    case QMovie::Paused:

        movie.setPaused(false);

        break;

    case QMovie::Running:

        movie.setPaused(true);

        break;

    }

}

void VideoPlayer::movieStateChanged(QMovie::MovieState state)

{

    switch(state) {

    case QMovie::NotRunning:

    case QMovie::Paused:

        playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));

        break;

    case QMovie::Running:

        playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause));

        break;

    }

}

void VideoPlayer::frameChanged(int frame)

{

    if (!presentImage(movie.currentImage())) {

        movie.stop();

        playButton->setEnabled(false);

        positionSlider->setMaximum(0);

    } else {

        positionSlider->setValue(frame);

    }

}

void VideoPlayer::setPosition(int frame)

{

    movie.jumpToFrame(frame);

}

void VideoPlayer::rotateVideo(int angle)

{

    //rotate around the center of video element

    qreal x = videoItem->boundingRect().width() / 2.0;

    qreal y = videoItem->boundingRect().height() / 2.0;

    videoItem->setTransform(QTransform().translate(x, y).rotate(angle).translate(-x, -y));

}

bool VideoPlayer::presentImage(const QImage &image)

{

    QVideoFrame frame(image);

    if (!frame.isValid())

        return false;

    QVideoSurfaceFormat currentFormat = videoItem->surfaceFormat();

    if (frame.pixelFormat() != currentFormat.pixelFormat()

            || frame.size() != currentFormat.frameSize()) {

        QVideoSurfaceFormat format(frame.size(), frame.pixelFormat());

        if (!videoItem->start(format))

            return false;

    }

    if (!videoItem->present(frame)) {

        videoItem->stop();

        return false;

    } else {

        return true;

    }

}