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#include "slideshow.h"

#include <qmediaservice.h>

#include <qmediaplaylist.h>

#include <qvideowidget.h>

#include <QtGui>

SlideShow::SlideShow(QWidget *parent)

    : QWidget(parent)

    , imageViewer(0)

    , playlist(0)

    , statusLabel(0)

    , countdownLabel(0)

    , playButton(0)

    , stopButton(0)

    , viewerLayout(0)

{

    imageViewer = new QMediaImageViewer(this);

    connect(imageViewer, SIGNAL(stateChanged(QMediaImageViewer::State)),

            this, SLOT(stateChanged(QMediaImageViewer::State)));

    connect(imageViewer, SIGNAL(mediaStatusChanged(QMediaImageViewer::MediaStatus)),

            this, SLOT(statusChanged(QMediaImageViewer::MediaStatus)));

    connect(imageViewer, SIGNAL(elapsedTimeChanged(int)), this, SLOT(elapsedTimeChanged(int)));

    playlist = new QMediaPlaylist;

    playlist->setMediaObject(imageViewer);

    connect(playlist, SIGNAL(loaded()), this, SLOT(playlistLoaded()));

    connect(playlist, SIGNAL(loadFailed()), this, SLOT(playlistLoadFailed()));

    QVideoWidget *videoWidget = new QVideoWidget;

    videoWidget->setMediaObject(imageViewer);

    statusLabel = new QLabel(tr("%1 Images").arg(0));

    statusLabel->setAlignment(Qt::AlignCenter);

    viewerLayout = new QStackedLayout;

    viewerLayout->setStackingMode(QStackedLayout::StackAll);

    viewerLayout->addWidget(videoWidget);

    viewerLayout->addWidget(statusLabel);

    QMenu *openMenu = new QMenu(this);

    openMenu->addAction(tr("Directory..."), this, SLOT(openDirectory()));

    openMenu->addAction(tr("Playlist..."), this, SLOT(openPlaylist()));

    QToolButton *openButton = new QToolButton;

    openButton->setIcon(style()->standardIcon(QStyle::SP_DialogOpenButton));

    openButton->setMenu(openMenu);

    openButton->setPopupMode(QToolButton::InstantPopup);

    playButton = new QToolButton;

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

    playButton->setEnabled(false);

    connect(playButton, SIGNAL(clicked()), this, SLOT(play()));

    connect(this, SIGNAL(enableButtons(bool)), playButton, SLOT(setEnabled(bool)));

    stopButton = new QToolButton;

    stopButton->setIcon(style()->standardIcon(QStyle::SP_MediaStop));

    stopButton->setEnabled(false);

    connect(stopButton, SIGNAL(clicked()), imageViewer, SLOT(stop()));

    QAbstractButton *nextButton = new QToolButton;

    nextButton->setIcon(style()->standardIcon(QStyle::SP_MediaSkipForward));

    nextButton->setEnabled(false);

    connect(nextButton, SIGNAL(clicked()), playlist, SLOT(next()));

    connect(this, SIGNAL(enableButtons(bool)), nextButton, SLOT(setEnabled(bool)));

    QAbstractButton *previousButton = new QToolButton;

    previousButton->setIcon(style()->standardIcon(QStyle::SP_MediaSkipBackward));

    previousButton->setEnabled(false);

    connect(previousButton, SIGNAL(clicked()), playlist, SLOT(previous()));

    connect(this, SIGNAL(enableButtons(bool)), previousButton, SLOT(setEnabled(bool)));

    countdownLabel = new QLabel;

    QBoxLayout *controlLayout = new QHBoxLayout;

    controlLayout->setMargin(0);

    controlLayout->addWidget(openButton);

    controlLayout->addStretch(1);

    controlLayout->addWidget(previousButton);

    controlLayout->addWidget(stopButton);

    controlLayout->addWidget(playButton);

    controlLayout->addWidget(nextButton);

    controlLayout->addStretch(1);

    controlLayout->addWidget(countdownLabel);

    QBoxLayout *layout = new QVBoxLayout;

    layout->addLayout(viewerLayout);

    layout->addLayout(controlLayout);

    setLayout(layout);

}

void SlideShow::openPlaylist()

{

    QString path = QFileDialog::getOpenFileName(this);

    if (!path.isEmpty()) {

        playlist->clear();

        playlist->load(QUrl::fromLocalFile(path));

    }

}

void SlideShow::openDirectory()

{

    QString path = QFileDialog::getExistingDirectory(this);

    if (!path.isEmpty()) {

        playlist->clear();

        QDir dir(path);

        foreach (const QString &fileName, dir.entryList(QDir::Files))

            playlist->addMedia(QUrl::fromLocalFile(dir.absoluteFilePath(fileName)));

        statusChanged(imageViewer->mediaStatus());

        emit enableButtons(playlist->mediaCount() > 0);

    }

}

void SlideShow::play()

{

    switch (imageViewer->state()) {

    case QMediaImageViewer::StoppedState:

    case QMediaImageViewer::PausedState:

        imageViewer->play();

        break;

    case QMediaImageViewer::PlayingState:

        imageViewer->pause();

        break;

    }

}

void SlideShow::stateChanged(QMediaImageViewer::State state)

{

    switch (state) {

    case QMediaImageViewer::StoppedState:

        stopButton->setEnabled(false);

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

        break;

    case QMediaImageViewer::PlayingState:

        stopButton->setEnabled(true);

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

        break;

    case QMediaImageViewer::PausedState:

        stopButton->setEnabled(true);

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

        break;

    }

}

void SlideShow::statusChanged(QMediaImageViewer::MediaStatus status)

{

    switch (status) {

    case QMediaImageViewer::NoMedia:

        statusLabel->setText(tr("%1 Images").arg(playlist->mediaCount()));

        viewerLayout->setCurrentIndex(1);

        break;

    case QMediaImageViewer::LoadingMedia:

        statusLabel->setText(tr("Image %1 of %2\nLoading...")

                .arg(playlist->currentIndex())

                .arg(playlist->mediaCount()));

        viewerLayout->setCurrentIndex(1);

        break;

    case QMediaImageViewer::LoadedMedia:

        statusLabel->setText(tr("Image %1 of %2")

                .arg(playlist->currentIndex())

                .arg(playlist->mediaCount()));

        viewerLayout->setCurrentIndex(0);

        break;

    case QMediaImageViewer::InvalidMedia:

        statusLabel->setText(tr("Image %1 of %2\nInvalid")

                .arg(playlist->currentIndex())

                .arg(playlist->mediaCount()));

        viewerLayout->setCurrentIndex(1);

        break;

    default:

        break;

    }

}

void SlideShow::playlistLoaded()

{

    statusChanged(imageViewer->mediaStatus());

    emit enableButtons(playlist->mediaCount() > 0);

}

void SlideShow::playlistLoadFailed()

{

    statusLabel->setText(playlist->errorString());

    viewerLayout->setCurrentIndex(1);

    emit enableButtons(false);

}

void SlideShow::elapsedTimeChanged(int time)

{

    const int remaining = (imageViewer->timeout() - time) / 1000;

    countdownLabel->setText(tr("%1:%2")

            .arg(remaining / 60, 2, 10, QLatin1Char('0'))

            .arg(remaining % 60, 2, 10, QLatin1Char('0')));

}