#include <LiquidCrystal_I2C.h>
#include <DHT.h>

#define DHTPIN 10
#define DHTTYPE DHT22
#define LOG_PERIOD 60000  // cetak tiap detik

DHT dht(DHTPIN, DHTTYPE);
struct
{
  uint32_t total;
  uint32_t ok;
  uint32_t crc_error;
  
  uint32_t time_out;
  uint32_t unknown;
} stat = { 0,0,0,0,0 };

//  Identificateur pour l'affichage
const int UV = 0;
const int TEMP = 1;
const int HUMID = 2;
const int RAD = 3;
const int BATTERY = 4;
const int PARTICULES = 5;

//  Buttons Pins
const int BSELECT = 4;
const int BUP = 2;
const int BDOWN = 5;
const int TEMP_HUMID = 6;

int posaffich = 0;  // position actuelle de l'affichage
int max_posaffich = 5; // nombre de valeur à afficher moins 1
int UVOUT = A0; //Output from the sensor
int REF_3V3 = A1; //3.3V power on the Arduino board
//int UVsensorIn = A0; //Output from the sensor
//int REFsensorIn = A1;
LiquidCrystal_I2C lcd(0x27,8,2);

byte bouton;
unsigned long counts; //variable for GM Tube events
unsigned long previousMillis;//variable for time measurement
String texts[6]= {"UV int:", "Temp", "Humid", "Bq/mn", "Part/s", "Battery"};
float values[6];
void impulse() { // dipanggil setiap ada sinyal FALLING di pin 2
    counts++;
}

void setup()
{
  pinMode(UVOUT, INPUT);
  pinMode(REF_3V3, INPUT);
  pinMode(BSELECT, INPUT_PULLUP);
  pinMode(BUP, INPUT_PULLUP);
  pinMode(BDOWN, INPUT_PULLUP);
  pinMode(TEMP_HUMID, INPUT);   

  attachInterrupt(digitalPinToInterrupt(3), impulse, FALLING); //define external interrupts 
  Serial.println("Start counter");
//  pinMode(UVsensorIn, INPUT);
//  pinMode(REFsensorIn, INPUT);
  Serial.begin(9600); //open serial port, set the baud rate to 9600 bps
  dht.begin();
  lcd.init();
  lcd.init();
  lcd.setCursor(0,0);
  lcd.clear();
  lcd.print("hello");
  delay(1000); 
}
 
void loop()
{
  bouton = test_bouton(); //retourne la valeur entre 
  Serial.print( "position afficheur =>" );
  Serial.print( posaffich );
  Serial.println();
  lcd.clear();

  values[UV] = uv();
  values[TEMP] = temp();
  values[HUMID] = humid();
  values[RAD] = geiger();
  values[PARTICULES] = particules();
  values[BATTERY] = battery();
  affich();
  delay(200);
}  

void affich()
{
  Serial.print( "position afficheur => " );
  Serial.print( posaffich );
  Serial.println();
  
  lcd.clear();
  Serial.print( "texte => ");
  Serial.print( texts[posaffich] );
  Serial.println();
  lcd.setCursor(0,0);
  lcd.print(texts[posaffich]);
  lcd.setCursor(0,1);
  lcd.print(values[posaffich]);
}

float uv()
{
  float uvLevel = averageAnalogRead(UVOUT);
  float refLevel = averageAnalogRead(REF_3V3);
//  int uvLevel = averageAnalogRead(UVsensorIn);
//  int refLevel = averageAnalogRead(REFsensorIn);
//  Serial.print(" Ulevel: ");
//  Serial.print(uvLevel);
//  Serial.print(" reflevel"); 
  
//  Serial.print(refLevel);
  float outputVoltage = 3.3 * uvLevel/refLevel;
//  Serial.print(" output voltage: ");
//  Serial.print(outputVoltage);
  
  float uvIntensity = mapfloat(outputVoltage, 0.97, 2.9, 0.0, 15.0);

  Serial.print(" UV Intensity: ");
  Serial.print(uvIntensity);
//  Serial.print(" mW/cm^2"); 
//  Serial.print(" input:");
//  Serial.print(uvLevel);
  Serial.println(); 
  return uvIntensity;
  
}               
 
//Takes an average of readings on a given pin
//Returns the average
int averageAnalogRead(int pinToRead)
{
  byte numberOfReadings = 20;
  float runningValue = 0;
  float Value = 0;
  for(int x = 0 ; x < numberOfReadings ; x++)
  {
    float val = analogRead(pinToRead);
    runningValue += val;
  }
  Value = runningValue / (float)numberOfReadings;
  return Value;
}

float mapfloat(float x, float in_min, float in_max, float out_min, float out_max)
{
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

byte test_bouton()
{
  
  if ( digitalRead( BSELECT ) == 0)
  {
      // put here the code if select button is pushed
      Serial.print( "SELECT" );
      Serial.println();
      return BSELECT;
  }else if ( digitalRead( BUP ) == 0 )
  {
      // code for button up pushed
      Serial.print( "UP" );
      Serial.println();
      if ( posaffich == 0 )
      {
          posaffich = max_posaffich;
      }else
      {
          posaffich--;
      }
      return BUP;
  }else if ( digitalRead( BDOWN ) == 0 )
  {
      // code for button down pushed
      Serial.print( "Down" );
      Serial.println();
      if ( posaffich == max_posaffich )
      {
          posaffich = 0;
      }else
      {
          posaffich++;
      }
      return BDOWN;
  }
  return 0;
}

float temp()
{
    uint32_t start = micros();
    float t = dht.readTemperature();
    uint32_t stop = micros();

    stat.total++;
    if (isnan(t)) {
      Serial.println("Failed to read temperature from DHT");
      return -199;
    } else {
      return t;
    }
}

float humid()
{
    uint32_t start = micros();
    float h = dht.readHumidity();
    uint32_t stop = micros();

    stat.total++;
    if (isnan(h)) {
      Serial.println("Failed to read humidity from DHT");
      return -1;
    } else {
      return h; 
    }
  
}

float geiger()
{
  //here the code for acquiring radiations
  //affich(RAD, text, value);
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis > LOG_PERIOD) {
        previousMillis = currentMillis;
        Serial.println(counts);
        return counts; // affiche le nombre de particules comptées en une minute
        counts = 0;
   }
}

float particules()
{
  //here the code for acquiring particules
  //affich(PARTICULES, text, value);
}

float battery()
{
  //here the code for acquiring battery
  //affich(BATTERY, text, value);
}