#include "radio433.h"
#include <QDebug>
#include <sys/time.h>


Radio433::Radio433(QObject *parent) :
    QObject(parent)
{
    // Set up receiver
    m_receiver = new Gpio(this,27);
    m_receiver->setDirection(INPUT);
    m_receiver->setEdgeInterrupt(EDGE_BOTH);

    // Set up transmitter
    m_transmitter = new Gpio(this,22);
    m_transmitter->setDirection(OUTPUT);
    m_transmitter->setValue(LOW);

    connect(m_receiver, &Gpio::pinInterrupt, this, &Radio433::handleInterrupt);

    m_receiver->start();
}

Radio433::~Radio433()
{
    m_receiver->quit();
    m_receiver->wait();
}

void Radio433::sendData(QList<int> rawData)
{

    //first we have to disable our receiver, to prevent reading this signal
    m_receiver->stop();

    m_transmitter->setValue(LOW);
    int flag=1;

    for(int i = 0; i <= 8; i++){
        foreach (int delay, rawData) {
            // 1 = High, 0 = Low
            m_transmitter->setValue(flag %2);
            flag++;
            //qDebug() << "flag" << flag %2;
            delayMicros(delay);
        }
    }
    //qDebug() << "signal sent." << rawData;

    // re-enable it
    m_transmitter->setValue(LOW);
    m_receiver->start();

}

int Radio433::micros()
{
    struct timeval tv ;
    int now ;

    gettimeofday (&tv, NULL) ;
    now  = (int)tv.tv_sec * (int)1000000 + (int)tv.tv_usec ;

    return (int)(now - m_epochMicro) ;
}

void Radio433::delayMilli(int milliSeconds)
{
    struct timespec sleeper, dummy ;

    sleeper.tv_sec  = (time_t)(milliSeconds / 1000) ;
    sleeper.tv_nsec = (long)(milliSeconds % 1000) * 1000000;

    nanosleep (&sleeper, &dummy) ;
}

//void Radio433::delayMicroseconds(int pulseLength)
//{
//    struct timespec sleeper ;

//    if(pulseLength <= 0){
//        return;
//    }else {
//        if(pulseLength < 100){
//            struct timeval tNow, tLong, tEnd ;

//            gettimeofday (&tNow, NULL) ;
//            tLong.tv_sec  = pulseLength / 1000000 ;
//            tLong.tv_usec = pulseLength % 1000000 ;
//            timeradd (&tNow, &tLong, &tEnd) ;

//            while (timercmp (&tNow, &tEnd, <)){
//                gettimeofday (&tNow, NULL) ;
//            }
//        }
//        sleeper.tv_sec  = 0 ;
//        sleeper.tv_nsec = (long)(pulseLength * 1000) ;
//        nanosleep (&sleeper, NULL);
//        //qDebug() << "time " << sleeper.tv_nsec;
//    }
//}

void Radio433::delayMicros(int microSeconds)
{
    struct timespec sleeper;

    sleeper.tv_sec  = 0;
    sleeper.tv_nsec = (long)(microSeconds * 1000);

    nanosleep (&sleeper, NULL) ;
}


void Radio433::handleInterrupt()
{
    long currentTime = micros();
    m_duration = currentTime - m_lastTime;

    // filter nois
    if (m_duration > 5000 && m_duration > m_timings[0] - 200 && m_duration < m_timings[0] + 200) {

        m_repeatCount++;
        m_changeCount--;

        if(m_repeatCount == 2) {

            // if we have a regular signal (1 bit sync + 48 bit data)
            if(m_changeCount == RC_MAX_CHANGES){
                // write rawdata to a List and reset values to 0
                QList<int> rawData;
                for(int i = 0; i < RC_MAX_CHANGES; i++ ){
                    rawData.append(m_timings[i]);
                    m_timings[i] = 0;
                }
                //                qDebug() << "-----------------------------------------------------------";
                //                qDebug() << "|                    GENERIC signal                       |";
                //                qDebug() << "-----------------------------------------------------------";
                //                qDebug() << "delay      :" << rawData.first() /31;
                //                qDebug() << rawData;

                emit dataReceived(rawData);
            }
            m_repeatCount = 0;
        }
        m_changeCount = 0;

    }else if(m_duration > 5000){
        m_changeCount = 0;
    }
    if (m_changeCount > RC_MAX_CHANGES) {
        m_changeCount = 0;
        m_repeatCount = 0;
    }
    m_timings[m_changeCount++] = m_duration;
    m_lastTime = currentTime;
}