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#include "bbcompass.h"
#include "bbutil.h"

using namespace BbUtil;

BbCompass::BbCompass(QSensor *sensor)
#ifdef HAVE_COMPASS_SENSOR
    : BbSensorBackend<QCompassReading>(devicePath(), SENSOR_TYPE_COMPASS, sensor)
#else
    : BbSensorBackend<QCompassReading>(devicePath(), SENSOR_TYPE_ROTATION_MATRIX, sensor)
#endif
{
    setDescription(QLatin1String("Azimuth in degrees from magnetic north"));
}

bool BbCompass::updateReadingFromEvent(const sensor_event_t &event, QCompassReading *reading)
{
    float azimuth;
#ifdef HAVE_COMPASS_SENSOR
    azimuth = event.compass_s.azimuth;
#else
    float xRad, yRad, zRad;
    matrixToEulerZXY(event.rotation_matrix, xRad, yRad, zRad);
    azimuth = radiansToDegrees(zRad);
    if (azimuth < 0)
        azimuth = -azimuth;
    else
        azimuth = 360.0f - azimuth;
#endif

    if (isAutoAxisRemappingEnabled()) {
        azimuth += orientationForRemapping();
        if (azimuth >= 360.0f)
            azimuth -= 360.0f;
    }

    reading->setAzimuth(azimuth);


    switch (event.accuracy) {
    case SENSOR_ACCURACY_UNRELIABLE:
        reading->setCalibrationLevel(0.0f);
        break;
    case SENSOR_ACCURACY_LOW:
        reading->setCalibrationLevel(0.1f);
        break;

    // We determined that MEDIUM should map to 1.0, because existing code samples
    // show users should pop a calibration screen when seeing < 1.0. The MEDIUM accuracy
    // is actually good enough not to require calibration, so we don't want to make it seem
    // like it is required artificially.
    case SENSOR_ACCURACY_MEDIUM:
        reading->setCalibrationLevel(1.0f);
        break;
    case SENSOR_ACCURACY_HIGH:
        reading->setCalibrationLevel(1.0f);
        break;
    }

    return true;
}

QString BbCompass::devicePath()
{
#ifdef HAVE_COMPASS_SENSOR
    return QLatin1String("/dev/sensor/compass");
#else
    return QLatin1String("/dev/sensor/rotMatrix");
#endif
}
