/**
   @file gyroevdevadaptor.cpp
   @brief Plugin for GyroAdaptorEvdev

   <p>
   Copyright (C) 2009-2010 Nokia Corporation
   Copyright (C) 2015 Jolla

   @author Lorn Potter <lorn.potter@jolla.com>
   @author Timo Rongas <ext-timo.2.rongas@nokia.com>
   @author Markus Lehtonen <markus.lehtonen@nokia.com>

   This file is part of Sensord.

   Sensord is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License
   version 2.1 as published by the Free Software Foundation.

   Sensord is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with Sensord.  If not, see <http://www.gnu.org/licenses/>.
   </p>
*/

#include "gyroevdevadaptor.h"
#include "config.h"
#include "logging.h"
#include <errno.h>
#include <fcntl.h>
#include <linux/input.h>
#include <unistd.h>
#include <QMap>

#include "datatypes/utils.h"

GyroAdaptorEvdev::GyroAdaptorEvdev(const QString& id) :
    InputDevAdaptor(id, 1)
{
    gyroscopeBuffer_ = new DeviceAdaptorRingBuffer<TimedXyzData>(1);
    setAdaptedSensor("gyroscope", "Internal gyroscope values", gyroscopeBuffer_);
    setDescription("Input device gyroscope adaptor");
    powerStatePath_ = SensorFrameworkConfig::configuration()->value("gyroscope/powerstate_path").toByteArray();
   // introduceAvailableDataRange(DataRange(0, 4095, 1));
    setDefaultInterval(10);
}

GyroAdaptorEvdev::~GyroAdaptorEvdev()
{
    delete gyroscopeBuffer_;
}

void GyroAdaptorEvdev::interpretEvent(int src, struct input_event *ev)
{
    Q_UNUSED(src);

    switch (ev->type) {
    case EV_ABS:
    case EV_REL:
        switch (ev->code) {
        case ABS_X:
            gyroValue_.x_ = ev->value;
            break;
        case ABS_Y:
            gyroValue_.y_ = ev->value;
            break;
        case ABS_Z:
            gyroValue_.z_ = ev->value;
            break;
        }
        break;
    }
}

void GyroAdaptorEvdev::interpretSync(int src, struct input_event *ev)
{
    Q_UNUSED(src);
    commitOutput(ev);
}

void GyroAdaptorEvdev::commitOutput(struct input_event *ev)
{
    TimedXyzData* gyroData = gyroscopeBuffer_->nextSlot();
    gyroData->x_ = gyroValue_.x_;
    gyroData->y_ = gyroValue_.y_;
    gyroData->z_ = gyroValue_.z_;

    gyroData->timestamp_ = Utils::getTimeStamp(ev);

    gyroscopeBuffer_->commit();
    gyroscopeBuffer_->wakeUpReaders();
}

unsigned int GyroAdaptorEvdev::evaluateIntervalRequests(int& sessionId) const
{
    unsigned int highestValue = 0;
    int winningSessionId = -1;

    if (m_intervalMap.size() == 0) {
        sessionId = winningSessionId;
        return defaultInterval();
    }

    // Get the smallest positive request, 0 is reserved for HW wakeup
    QMap<int, unsigned int>::const_iterator it;
    it = m_intervalMap.begin();
    highestValue = it.value();
    winningSessionId = it.key();

    for (++it; it != m_intervalMap.constEnd(); ++it) {
        if ((it.value() < highestValue) && (it.value() > 0)) {
            highestValue = it.value();
            winningSessionId = it.key();
        }
    }

    sessionId = winningSessionId;
    return highestValue > 0 ? highestValue : defaultInterval();
}

bool GyroAdaptorEvdev::startSensor()
{
    if (!powerStatePath_.isEmpty()) {
        writeToFile(powerStatePath_, "1");
    }
    if (SysfsAdaptor::startSensor()) {
        return true;
    }
    return false;
}

void GyroAdaptorEvdev::stopSensor()
{
    if (!powerStatePath_.isEmpty()) {
        writeToFile(powerStatePath_, "0");
    }

    SysfsAdaptor::stopSensor();
}

bool GyroAdaptorEvdev::standby()
{
    stopSensor();
    return true;
}

bool GyroAdaptorEvdev::resume()
{
    startSensor();
    return true;
}
