#include <avr/wdt.h>
#include "DHT.h"
#include <LiquidCrystal_I2C.h>
#define DHTPIN A1  // what pin we're connected to
#define DHTTYPE DHT11

LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht(DHTPIN, DHTTYPE);

// PARAMETERS
int hON = 65;                       // Turn Off the fan at humidity
int hOFF = 65;                      // Turn Off the fan at humidity
unsigned long MinOFFTime = 300000;  // minimum time after switch Off to turn back ON again
const int pResistor = A0;
int val_lumina;
const int BUTTON_PIN = 6; // the number of the pushbutton pin
const int LONG_PRESS_TIME  = 1000; // 1000 milliseconds
// Variables will change:
int lastState = LOW;  // the previous state from the input pin
int currentState;     // the current reading from the input pin
unsigned long pressedTime  = 0;
unsigned long releasedTime = 0;

int releu = 7;
// VARIABLES
unsigned long lastmeasurement = 0;
unsigned long switchedonmillis = 0;
unsigned long switchedoffmillis = 0;
float t = 0;
float h = 0;
float hone = 0;
float htwo = 0;
float hthree = 0;
byte counter = 0;
float haverage = 0;
byte fan = 0;

void setup() {
  fanoff();  // turn off fan
  Serial.begin(9600);
  pinMode(releu, OUTPUT);
   pinMode(BUTTON_PIN, INPUT_PULLUP);
  dht.begin();
  lcd.init();  // initialize the LCD
  lcd.backlight();

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("   VERIFICAM ");
  lcd.setCursor(0, 1);
  lcd.print("    SENZORII");
  measurement();
  delay(2000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp. : ");
  lcd.print(t);
  lcd.print(" ");
  lcd.print((char)223);
  lcd.print("C");
  lcd.setCursor(0, 1);
  lcd.print("Umid. : ");
  lcd.print(h);
  lcd.print("  %");
  delay(2000);
}


void measurement() {
  if (counter >= 3) {
    counter = 0;
  }

  counter++;

  h = dht.readHumidity();
  t = dht.readTemperature();
  if (isnan(t) || isnan(h)) {
    Serial.println("Failed to read from DHT");
  }
  Serial.println(counter);
  if (counter == 1) {
    hone = h;
  }
  if (counter == 2) {
    htwo = h;
  }
  if (counter == 3) {
    hthree = h;
  }
  haverage = (hone + htwo + hthree) / 3;

  lastmeasurement = millis();
}

void fanon() {
  digitalWrite(releu, LOW);
  Serial.println("FAN ON");
  fan = 1;
  delay(30000);
}

void fanoff() {
  digitalWrite(releu, HIGH);
  Serial.println("FAN OFF");
  fan = 0;
}

void LCD() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp. : ");
  lcd.print(t);
  lcd.print(" ");
  lcd.print((char)223);
  lcd.print("C");
  lcd.setCursor(0, 1);
  lcd.print("Umid. : ");
  lcd.print(h);
  lcd.print("  %");
}

void verificalumina() {
  val_lumina = analogRead(pResistor);
  if (val_lumina > 45) {
    lcd.backlight();
  } else {
    lcd.noBacklight();
    delay(50);
  }
  Serial.println(String("Intensitate lumina : ") + val_lumina);
}

void buton(){
 // read the state of the switch/button:
  currentState = digitalRead(BUTTON_PIN);

   if(lastState == HIGH && currentState == LOW)        // button is pressed
    pressedTime = millis();
  else if(lastState == LOW && currentState == HIGH) { // button is released
    releasedTime = millis();

    long pressDuration = releasedTime - pressedTime;

    if( pressDuration > LONG_PRESS_TIME )
      lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Temp. : ");
    lcd.print(t);
    lcd.print(" ");
    lcd.print((char)223);
    lcd.print("C");
    lcd.setCursor(0, 1);
    lcd.print("    AERISIM!");
    fanon();  // turn on
    delay(600000);
    fanoff();  // turn on
  }

  // save the the last state
  lastState = currentState;

}

void loop() {
  buton();

  if ((millis() > 15001) && ((millis() - 15000) > lastmeasurement)) {
    measurement();
    Serial.print("Umiditate: ");
    Serial.print(h);
    Serial.print(" %\t");
    Serial.print("Temperatura: ");
    Serial.print(t);
    Serial.println(" *C");
    Serial.println(String("Val. umid. 1: ") + hone);
    Serial.println(String("Val. umid. 2: ") + htwo);
    Serial.println(String("Val. umid. 3: ") + hthree);
    Serial.println(String("Media ultimelor 3 masuratori de umiditate: ") + haverage);

    verificalumina();
    LCD();

    if (fan == 0)  // if it's OFF
    {
      // CHECK IF IT WAS OFF FOR AT LEAST 120 seconds AND IF it was turned OFF at all
      if (haverage >= hON) {
        fanon();
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("    AERISIM!");
        lcd.setCursor(0, 1);
        lcd.print("Umid. : ");
        lcd.print(h);
        lcd.print("  %");
      }
    }
    // if it's working
    if (fan == 1) {
      if (haverage < hOFF)  // KEEP IT FOR MINIMUM 60 seconds
      {
        fanoff();
      }
    }
  }
}