/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "videoplayer.h"

#include <QtWidgets>
#include <QGraphicsVideoItem>

VideoPlayer::VideoPlayer(QWidget *parent)
    : QWidget(parent)
{
    m_mediaPlayer = new QMediaPlayer(this);
    const QSize screenGeometry = screen()->availableSize();
    m_videoItem = new QGraphicsVideoItem;
    m_videoItem->setSize(QSizeF(screenGeometry.width() / 3, screenGeometry.height() / 2));

    QGraphicsScene *scene = new QGraphicsScene(this);
    QGraphicsView *graphicsView = new QGraphicsView(scene);

    scene->addItem(m_videoItem);

    QSlider *rotateSlider = new QSlider(Qt::Horizontal);
    rotateSlider->setToolTip(tr("Rotate Video"));
    rotateSlider->setRange(-180,  180);
    rotateSlider->setValue(0);

    connect(rotateSlider, &QAbstractSlider::valueChanged,
            this, &VideoPlayer::rotateVideo);

    QAbstractButton *openButton = new QPushButton(tr("Open..."));
    connect(openButton, &QAbstractButton::clicked, this, &VideoPlayer::openFile);

    m_playButton = new QPushButton;
    m_playButton->setEnabled(false);
    m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));

    connect(m_playButton, &QAbstractButton::clicked, this, &VideoPlayer::play);

    m_positionSlider = new QSlider(Qt::Horizontal);
    m_positionSlider->setRange(0, 0);

    connect(m_positionSlider, &QAbstractSlider::sliderMoved,
            this, &VideoPlayer::setPosition);

    QBoxLayout *controlLayout = new QHBoxLayout;
    controlLayout->setContentsMargins(0, 0, 0, 0);
    controlLayout->addWidget(openButton);
    controlLayout->addWidget(m_playButton);
    controlLayout->addWidget(m_positionSlider);

    QBoxLayout *layout = new QVBoxLayout(this);
    layout->addWidget(graphicsView);
    layout->addWidget(rotateSlider);
    layout->addLayout(controlLayout);

    m_mediaPlayer->setVideoOutput(m_videoItem);
    connect(m_mediaPlayer, &QMediaPlayer::playbackStateChanged,
            this, &VideoPlayer::mediaStateChanged);
    connect(m_mediaPlayer, &QMediaPlayer::positionChanged, this, &VideoPlayer::positionChanged);
    connect(m_mediaPlayer, &QMediaPlayer::durationChanged, this, &VideoPlayer::durationChanged);
}

VideoPlayer::~VideoPlayer()
{
}

QSize VideoPlayer::sizeHint() const
{
    return (m_videoItem->size() * qreal(3) / qreal(2)).toSize();
}

bool VideoPlayer::isPlayerAvailable() const
{
    return m_mediaPlayer->isAvailable();
}

void VideoPlayer::openFile()
{
    QFileDialog fileDialog(this);
    fileDialog.setAcceptMode(QFileDialog::AcceptOpen);
    fileDialog.setWindowTitle(tr("Open Movie"));
    fileDialog.setDirectory(QStandardPaths::standardLocations(QStandardPaths::MoviesLocation).value(0, QDir::homePath()));
    if (fileDialog.exec() == QDialog::Accepted)
        load(fileDialog.selectedUrls().constFirst());
}

void VideoPlayer::load(const QUrl &url)
{
    m_mediaPlayer->setSource(url);
    m_playButton->setEnabled(true);
}

void VideoPlayer::play()
{
    switch (m_mediaPlayer->playbackState()) {
    case QMediaPlayer::PlayingState:
        m_mediaPlayer->pause();
        break;
    default:
        m_mediaPlayer->play();
        break;
    }
}

void VideoPlayer::mediaStateChanged(QMediaPlayer::PlaybackState state)
{
    switch(state) {
    case QMediaPlayer::PlayingState:
        m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause));
        break;
    default:
        m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
        break;
    }
}

void VideoPlayer::positionChanged(qint64 position)
{
    m_positionSlider->setValue(position);
}

void VideoPlayer::durationChanged(qint64 duration)
{
    m_positionSlider->setRange(0, duration);
}

void VideoPlayer::setPosition(int position)
{
    m_mediaPlayer->setPosition(position);
}


void VideoPlayer::rotateVideo(int angle)
{
    //rotate around the center of video element
    qreal x = m_videoItem->boundingRect().width() / 2.0;
    qreal y = m_videoItem->boundingRect().height() / 2.0;
    m_videoItem->setTransform(QTransform().translate(x, y).rotate(angle).translate(-x, -y));
}
