//#define DEBUG


#include "Arduino.h"

#include <Adafruit_Sensor.h> //required for dht library
#include <DHT.h>
#include <Wire.h>
#include <BH1750.h>

// data/homie/config.json hochladen mit platformio run --target uploadfs

/*
  float humidity; //[%RH]  DHT
  float temperature; //[deg C]   DHT
  float light; //[Lux]  BH1750
  bool movement //true bei pir output hight, false wenn low   HC12?
*/



//GPIO2 is blue led
#define DHTPIN D7     // Digital pin connected to the DHT sensor
//DHT dht(13,DHT22,11); //default:11
DHT dht(DHTPIN,DHT22,11); //default:11

#define PIRPIN D6  //pir sensor needs 5v. output level is 3.3v

BH1750 lightMeter(0x23);

//timings
unsigned long lastsensorreadtime=0;
unsigned long sensorupdatedelay=60000; //delay for reading and transmitting
unsigned long lastPIRtime=0;
unsigned long PIRdelay=100; //polling delay
bool motion=false;


#include <Homie.h>
#define FW_NAME "sensoresp3"
#define FW_VERSION "1.0.0"



HomieNode sensorNode("sensors", "Sensors","sensors");


char tempstring[16]; //for dtostrf


void loopHandler();

void setup() {
  Serial.begin(115200);
  Serial.println();
  Serial.println("Welcome");

  pinMode(PIRPIN, INPUT_PULLUP);

  Serial.println("initializing dht");
  dht.begin(); // dht pins: 1=power, 2=data, 3=NC, 4=GND. 10k from data to power needed 

  Serial.println("initializing bh1750");
  Wire.begin();  //initialize i2c. SDA=D2, SCL=D1
  if (lightMeter.begin(BH1750::CONTINUOUS_HIGH_RES_MODE)) {
    Serial.println(F("BH1750 Advanced begin"));
  } else {
    Serial.println(F("Error initialising BH1750"));
  }

  Serial.println("connecting..");
  
  Homie_setFirmware(FW_NAME, FW_VERSION);
  Homie_setBrand(FW_NAME);
  Homie.setLoopFunction(loopHandler);


  sensorNode.advertise("temperature");
  sensorNode.advertise("humidity");
  sensorNode.advertise("light");
  sensorNode.advertise("motion");
  

  Homie.setup();
  Serial.println("connected"); //wird nicht ausgegeben. keine ahnung warum.

}

void loop() {
  Homie.loop();  
}

void loopHandler() {

  if (millis() >= (lastPIRtime+PIRdelay)){
     
     if (digitalRead(PIRPIN)){
       if (!motion) { //changed?
        Homie.getLogger() << "motion " << ": " << "true" << endl;
        sensorNode.setProperty("motion").send(String("true"));
       }
       motion=true;
     }else{
       if (motion) { //changed?
        Homie.getLogger() << "motion " << ": " << "false" << endl;
        sensorNode.setProperty("motion").send(String("false"));
       }
       motion=false;
     }
     lastPIRtime=millis();
  }

  if (millis() >= (lastsensorreadtime+sensorupdatedelay))
  {
    Serial.println("Sending");

    if (WiFi.status() != WL_CONNECTED) //restart if wifi signal loss
    {
      ESP.reset();
    }


    float temperatureDHT = dht.readTemperature();
    if (!(isnan(temperatureDHT) == 1)){ //success
      Homie.getLogger() << "temperature " << ": " << temperatureDHT << endl;
      sensorNode.setProperty("temperature").send(String(temperatureDHT));
    }

    float humidityDHT = dht.readHumidity();
    if (!(isnan(humidityDHT) == 1)){ //success
      Homie.getLogger() << "humidity " << ": " << humidityDHT << endl;
      sensorNode.setProperty("humidity").send(String(humidityDHT));
    }
    
    
  
    float light = lightMeter.readLightLevel(); // [lux]
    Homie.getLogger() << "light " << ": " << light << endl;
    sensorNode.setProperty("light").send(String(light));



    lastsensorreadtime=millis();
  }
}