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#include "qandroidcamerazoomcontrol.h"

#include "qandroidcamerasession.h"
#include "androidcamera.h"
#include "qandroidmultimediautils.h"
#include <qmath.h>

QT_BEGIN_NAMESPACE

QAndroidCameraZoomControl::QAndroidCameraZoomControl(QAndroidCameraSession *session)
    : QCameraZoomControl()
    , m_cameraSession(session)
    , m_maximumZoom(1.0)
    , m_requestedZoom(1.0)
    , m_currentZoom(1.0)
{
    connect(m_cameraSession, SIGNAL(opened()),
            this, SLOT(onCameraOpened()));
}

qreal QAndroidCameraZoomControl::maximumOpticalZoom() const
{
    // Optical zoom not supported
    return 1.0;
}

qreal QAndroidCameraZoomControl::maximumDigitalZoom() const
{
    return m_maximumZoom;
}

qreal QAndroidCameraZoomControl::requestedOpticalZoom() const
{
    // Optical zoom not supported
    return 1.0;
}

qreal QAndroidCameraZoomControl::requestedDigitalZoom() const
{
    return m_requestedZoom;
}

qreal QAndroidCameraZoomControl::currentOpticalZoom() const
{
    // Optical zoom not supported
    return 1.0;
}

qreal QAndroidCameraZoomControl::currentDigitalZoom() const
{
    return m_currentZoom;
}

void QAndroidCameraZoomControl::zoomTo(qreal optical, qreal digital)
{
    Q_UNUSED(optical);

    if (!qFuzzyCompare(m_requestedZoom, digital)) {
        m_requestedZoom = digital;
        emit requestedDigitalZoomChanged(m_requestedZoom);
    }

    if (m_cameraSession->camera()) {
        digital = qBound(qreal(1), digital, m_maximumZoom);
        int validZoomIndex = qt_findClosestValue(m_zoomRatios, qRound(digital * 100));
        qreal newZoom = m_zoomRatios.at(validZoomIndex) / qreal(100);
        if (!qFuzzyCompare(m_currentZoom, newZoom)) {
            m_cameraSession->camera()->setZoom(validZoomIndex);
            m_currentZoom = newZoom;
            emit currentDigitalZoomChanged(m_currentZoom);
        }
    }
}

void QAndroidCameraZoomControl::onCameraOpened()
{
    if (m_cameraSession->camera()->isZoomSupported()) {
        m_zoomRatios = m_cameraSession->camera()->getZoomRatios();
        qreal maxZoom = m_zoomRatios.last() / qreal(100);
        if (m_maximumZoom != maxZoom) {
            m_maximumZoom = maxZoom;
            emit maximumDigitalZoomChanged(m_maximumZoom);
        }
        zoomTo(1, m_requestedZoom);
    } else {
        m_zoomRatios.clear();
        if (!qFuzzyCompare(m_maximumZoom, qreal(1))) {
            m_maximumZoom = 1.0;
            emit maximumDigitalZoomChanged(m_maximumZoom);
        }
    }
}

QT_END_NAMESPACE