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** Copyright (C) 2015 The Qt Company Ltd.
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** This file is part of the QtSensors module of the Qt Toolkit.
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****************************************************************************/

#include "winrtgyroscope.h"
#include "winrtcommon.h"

#include <QtSensors/QGyroscope>
#include <private/qeventdispatcher_winrt_p.h>

#include <functional>
#include <wrl.h>
#include <windows.devices.sensors.h>
using namespace Microsoft::WRL;
using namespace Microsoft::WRL::Wrappers;
using namespace ABI::Windows::Foundation;
using namespace ABI::Windows::Devices::Sensors;

typedef ITypedEventHandler<Gyrometer *, GyrometerReadingChangedEventArgs *> InclinometerReadingHandler;

QT_USE_NAMESPACE

class WinRtGyroscopePrivate
{
public:
    WinRtGyroscopePrivate(WinRtGyroscope *p)
        : minimumReportInterval(0), q(p)
    {
        token.value = 0;
    }

    QGyroscopeReading reading;

    ComPtr<IGyrometer> sensor;
    EventRegistrationToken token;
    quint32 minimumReportInterval;

    HRESULT readingChanged(IGyrometer *, IGyrometerReadingChangedEventArgs *args)
    {
        ComPtr<IGyrometerReading> value;
        HRESULT hr = args->get_Reading(&value);
        if (FAILED(hr)) {
            qCWarning(lcWinRtSensors) << "Failed to get gyroscope reading" << qt_error_string(hr);
            return hr;
        }

        DOUBLE x;
        hr = value->get_AngularVelocityX(&x);
        if (FAILED(hr))
            qCWarning(lcWinRtSensors) << "Failed to get gyroscope X" << qt_error_string(hr);

        DOUBLE y;
        hr = value->get_AngularVelocityY(&y);
        if (FAILED(hr))
            qCWarning(lcWinRtSensors) << "Failed to get gyroscope Y" << qt_error_string(hr);

        DOUBLE z;
        hr = value->get_AngularVelocityZ(&z);
        if (FAILED(hr))
            qCWarning(lcWinRtSensors) << "Failed to get gyroscope Z" << qt_error_string(hr);

        DateTime dateTime;
        hr = value->get_Timestamp(&dateTime);
        if (FAILED(hr))
            qCWarning(lcWinRtSensors) << "Failed to get gyroscope timestamp" << qt_error_string(hr);

        reading.setX(x);
        reading.setY(y);
        reading.setZ(z);
        reading.setTimestamp(dateTimeToMsSinceEpoch(dateTime));
        q->newReadingAvailable();

        return S_OK;
    }

private:
    WinRtGyroscope *q;
};

WinRtGyroscope::WinRtGyroscope(QSensor *sensor)
    : QSensorBackend(sensor), d_ptr(new WinRtGyroscopePrivate(this))
{
    Q_D(WinRtGyroscope);
    HRESULT hr = QEventDispatcherWinRT::runOnXamlThread([d]() {
        HStringReference classId(RuntimeClass_Windows_Devices_Sensors_Gyrometer);
        ComPtr<IGyrometerStatics> factory;
        HRESULT hr = RoGetActivationFactory(classId.Get(), IID_PPV_ARGS(&factory));
        if (FAILED(hr)) {
            qCWarning(lcWinRtSensors) << "Unable to initialize gyroscope sensor factory."
                                      << qt_error_string(hr);
            return hr;
        }

        hr = factory->GetDefault(&d->sensor);
        if (FAILED(hr)) {
            qCWarning(lcWinRtSensors) << "Unable to get default gyroscope sensor."
                                      << qt_error_string(hr);
        }
        return hr;
    });
    if (FAILED(hr) || !d->sensor) {
        sensorError(hr);
        return;
    }

    hr = d->sensor->get_MinimumReportInterval(&d->minimumReportInterval);
    if (FAILED(hr)) {
        qCWarning(lcWinRtSensors) << "Unable to get the minimum report interval."
                                  << qt_error_string(hr);
        sensorError(hr);
        return;
    }

    addDataRate(1, 1000 / d->minimumReportInterval); // dataRate in Hz
    sensor->setDataRate(1);

    setReading<QGyroscopeReading>(&d->reading);
}

WinRtGyroscope::~WinRtGyroscope()
{
}

void WinRtGyroscope::start()
{
    Q_D(WinRtGyroscope);
    if (!d->sensor)
        return;
    if (d->token.value)
        return;

    HRESULT hr = QEventDispatcherWinRT::runOnXamlThread([d]() {
        ComPtr<InclinometerReadingHandler> callback =
            Callback<InclinometerReadingHandler>(d, &WinRtGyroscopePrivate::readingChanged);
        return d->sensor->add_ReadingChanged(callback.Get(), &d->token);
    });
    if (FAILED(hr)) {
        qCWarning(lcWinRtSensors) << "Unable to attach to reading changed event."
                                  << qt_error_string(hr);
        sensorError(hr);
        return;
    }

    int dataRate = sensor()->dataRate();
    if (!dataRate)
        return;

    quint32 reportInterval = qMax(d->minimumReportInterval, quint32(1000/dataRate));
    hr = d->sensor->put_ReportInterval(reportInterval);
    if (FAILED(hr)) {
        qCWarning(lcWinRtSensors) << "Unable to attach to set report interval."
                                  << qt_error_string(hr);
        sensorError(hr);
    }
}

void WinRtGyroscope::stop()
{
    Q_D(WinRtGyroscope);
    if (!d->sensor)
        return;
    if (!d->token.value)
        return;

    HRESULT hr = QEventDispatcherWinRT::runOnXamlThread([d]() {
        return d->sensor->remove_ReadingChanged(d->token);
    });
    if (FAILED(hr)) {
        qCWarning(lcWinRtSensors) << "Unable to detach from reading changed event."
                                  << qt_error_string(hr);
        sensorError(hr);
        return;
    }
    hr = d->sensor->put_ReportInterval(0);
    if (FAILED(hr)) {
        qCWarning(lcWinRtSensors) << "Unable to reset report interval."
                                  << qt_error_string(hr);
        sensorError(hr);
        return;
    }
    d->token.value = 0;
}