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#include "qgstreamerimagecapturecontrol.h"
#include <QtCore/QDebug>
#include <QtCore/QDir>

QGstreamerImageCaptureControl::QGstreamerImageCaptureControl(QGstreamerCaptureSession *session)
    :QCameraImageCaptureControl(session), m_session(session), m_ready(false), m_lastId(0)
{
    connect(m_session, SIGNAL(stateChanged(QGstreamerCaptureSession::State)), SLOT(updateState()));
    connect(m_session, SIGNAL(imageExposed(int)), this, SIGNAL(imageExposed(int)));
    connect(m_session, SIGNAL(imageCaptured(int,QImage)), this, SIGNAL(imageCaptured(int,QImage)));
    connect(m_session, SIGNAL(imageSaved(int,QString)), this, SIGNAL(imageSaved(int,QString)));
}

QGstreamerImageCaptureControl::~QGstreamerImageCaptureControl()
{
}

bool QGstreamerImageCaptureControl::isReadyForCapture() const
{
    return m_ready;
}

int QGstreamerImageCaptureControl::capture(const QString &fileName)
{
    m_lastId++;

    //it's allowed to request image capture while camera is starting
    if (m_session->pendingState() == QGstreamerCaptureSession::StoppedState ||
            !(m_session->captureMode() & QGstreamerCaptureSession::Image)) {
        //emit error in the next event loop,
        //so application can associate it with returned request id.
        QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
                                  Q_ARG(int, m_lastId),
                                  Q_ARG(int, QCameraImageCapture::NotReadyError),
                                  Q_ARG(QString,tr("Not ready to capture")));

        return m_lastId;
    }

    QString path = fileName;
    if (path.isEmpty()) {
        int lastImage = 0;
        QDir outputDir = QDir::currentPath();
        const auto list = outputDir.entryList(QStringList() << "img_*.jpg");
        for (const QString &fileName : list) {
            int imgNumber = QStringView{fileName}.mid(4, fileName.size()-8).toInt();
            lastImage = qMax(lastImage, imgNumber);
        }

        path = QString("img_%1.jpg").arg(lastImage+1,
                                         4, //fieldWidth
                                         10,
                                         QLatin1Char('0'));
    }

    m_session->captureImage(m_lastId, path);

    return m_lastId;
}

void QGstreamerImageCaptureControl::cancelCapture()
{

}

void QGstreamerImageCaptureControl::updateState()
{
    bool ready = (m_session->state() == QGstreamerCaptureSession::PreviewState) &&
            (m_session->captureMode() & QGstreamerCaptureSession::Image);

    if (m_ready != ready) {
        emit readyForCaptureChanged(m_ready = ready);
    }
}