#ifdef SENSOR_LDR

// High/Low Output LDR Sensor
// For example: RCWL-0516 (needs 5v input (gnd, vin), 3.3v output level. high for 2seconds when movement detected)
#include "sensor_ldr.h"


Sensor_LDR::Sensor_LDR(int p)
{
  pin=p;
}

void Sensor_LDR::init() //Things to be done during setup()
{    
  Serial.println("initializing LDR");
  pinMode(pin, INPUT);
  analogRead(pin); //first reading could be false
  init_ok=true;     
}

//Also called during setup()
void Sensor_LDR::setSettings(float minchange, unsigned long senddelaymax, unsigned long readdelay)
{
    data.minchange=minchange;
    data.senddelaymax=senddelaymax;
    data.readdelay=readdelay;
}

//Called during setup
void Sensor_LDR::advertise(HomieNode& p_sensorNode)
{
    sensorNode = &p_sensorNode;
    sensorNode->advertise("light");
    
}

void Sensor_LDR::sensorloop()
{
  if (init_ok) {
    sensordata &d=data;
    
    bool _changed=false;
    if (millis() >= (d.lastreadtime+d.readdelay)) {
      d.value = get_lux(in_ldr, out_ldr, SENSOR_LDR_ARRAYSIZE)/10.0; //read light level in lux
      if (fabs(d.lastsentvalue-d.value)>=d.minchange){
        _changed=true;
      }
      d.lastreadtime=millis();
    }

    if (_changed || millis() >= (d.lastsent+d.senddelaymax)) {
      Serial.print("Sending LDR. reason=");
      if (_changed) Serial.println("change"); else Serial.println("time");

      Homie.getLogger() << "light " << ": " << d.value << endl;
      sensorNode->setProperty("light").send(String(d.value));
      d.lastsentvalue=d.value;
      
      d.lastsent=millis();
    }
  }
}


//////////////////////////////////////////////////////////////////////////////
// Calculate lux based on rawADC reading from LDR returns value in lux/10
//////////////////////////////////////////////////////////////////////////////
//quelle: https://groups.google.com/forum/#!topic/souliss/1kMAltPB2ME[1-25]
int Sensor_LDR::get_lux(const unsigned int* _in, const unsigned int* _out, byte size)
{
  // take care the value is within range
  // val = constrain(val, _in[0], _in[size-1]);
  unsigned int val = analogRead(pin);
  #ifdef DEBUG   //DEBUG++++++++++++++++
        Serial.print("LDR RAW=: ");
        Serial.println(val);
  #endif

  if (val <= _in[0]) return _out[0];
  if (val >= _in[size-1]) return _out[size-1];

  // search right interval
  byte pos = 1;  // _in[0] allready tested
  while(val > _in[pos]) pos++;

  // this will handle all exact "points" in the _in array
  if (val == _in[pos]) return _out[pos];

  // interpolate in the right segment for the rest
  return map(val, _in[pos-1], _in[pos], _out[pos-1], _out[pos]);
}
#endif