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

// Komponent pinlari
#define ENCODER_CLK 2
#define ENCODER_DT 3
#define ENCODER_SW 4
#define DHT_PIN 7
#define RELAY_HEATER 6
#define RELAY_FAN 5

// LCD va DHT sozlamalari
LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht(DHT_PIN, DHT22);

// Global o‘zgaruvchilar
float targetTemp = 37.5;
int timerMinutes = 60;
float currentTemp;
float currentHumidity;
int menuIndex = 0;
bool inSubMenu = false;

void setup() {
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
  pinMode(ENCODER_SW, INPUT_PULLUP);
  pinMode(RELAY_HEATER, OUTPUT);
  pinMode(RELAY_FAN, OUTPUT);

  lcd.init();
  lcd.backlight();
  dht.begin();

  // Dastlabki logo
  lcd.setCursor(4, 0);
  lcd.print("INKUBATOR");
  lcd.setCursor(2, 1);
  lcd.print("KY-040 BILAN");
  delay(3000);
  lcd.clear();

  // Asosiy ekran
  displayMainScreen();
}

void loop() {
  // Harorat va namlikni yangilash
  currentTemp = dht.readTemperature();
  currentHumidity = dht.readHumidity();

  // Haroratni boshqarish
  controlTemperature();

  // SW tugmasi bosilganda menyuga kirish
  if (digitalRead(ENCODER_SW) == LOW) {
    delay(200); // Debouncing
    inSubMenu = !inSubMenu;
    if (inSubMenu) {
      displayMenu();
    } else {
      displayMainScreen();
    }
  }

  // Menyu ichida harakatlanish
  if (inSubMenu) {
    handleMenu();
  }
}

void displayMainScreen() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Harorat: ");
  lcd.print(currentTemp);
  lcd.print((char)223);
  lcd.print("C");
  lcd.setCursor(0, 1);
  lcd.print("Namlik: ");
  lcd.print(currentHumidity);
  lcd.print("%");

}

void displayMenu() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Harorat sozla");
  lcd.setCursor(0, 1);
  lcd.print("Taymer sozla");
}

void handleMenu() {
  static int lastEncoderState = digitalRead(ENCODER_CLK);
  int encoderState = digitalRead(ENCODER_CLK);

  if (encoderState != lastEncoderState) {
    if (digitalRead(ENCODER_DT) != encoderState) {
      menuIndex++;
    } else {
      menuIndex--;
    }

    menuIndex = constrain(menuIndex, 1, 3);
    lcd.clear();
    if (menuIndex == 1) {
      lcd.setCursor(0, 0);
      lcd.print("> Harorat sozla");
      lcd.setCursor(0, 1);
      lcd.print("  Taymer sozla");
    } else if (menuIndex == 2) {
      lcd.setCursor(0, 0);
      lcd.print("  Harorat sozla");
      lcd.setCursor(0, 1);
      lcd.print("> Taymer sozla");
    } else if (menuIndex == 3) {
      lcd.setCursor(0, 0);
      lcd.print("  Ortga qaytish");
    }
  }

  lastEncoderState = encoderState;

  // SW tugmasi bosilganda menyu ichiga kirish
  if (digitalRead(ENCODER_SW) == LOW) {
    delay(200); // Debouncing
    if (menuIndex == 0) {
      adjustTemperature();
    } else if (menuIndex == 1) {
      adjustTimer();
    } else if (menuIndex == 2) {
      inSubMenu = false;
      displayMainScreen();
    }
  }
}

void adjustTemperature() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Harorat sozlash:");
  lcd.setCursor(0, 1);
  lcd.print(targetTemp);
  lcd.print((char)223);
  lcd.print("C");

  while (digitalRead(ENCODER_SW) != LOW) {
    int encoderState = digitalRead(ENCODER_CLK);
    static int lastEncoderState = encoderState;

    if (encoderState != lastEncoderState) {
      if (digitalRead(ENCODER_DT) != encoderState) {
        targetTemp += 0.5;
      } else {
        targetTemp -= 0.5;
      }
      targetTemp = constrain(targetTemp, 30.0, 40.0);
      lcd.setCursor(0, 1);
      lcd.print("       ");
      lcd.setCursor(0, 1);
      lcd.print(targetTemp);
      lcd.print((char)223);
      lcd.print("C");
    }
    lastEncoderState = encoderState;
  }

  delay(200); // Debouncing
}

void adjustTimer() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Taymer sozlash:");
  lcd.setCursor(0, 1);
  lcd.print(timerMinutes);
  lcd.print(" min");

  while (digitalRead(ENCODER_SW) != LOW) {
    int encoderState = digitalRead(ENCODER_CLK);
    static int lastEncoderState = encoderState;

    if (encoderState != lastEncoderState) {
      if (digitalRead(ENCODER_DT) != encoderState) {
        timerMinutes++;
      } else {
        timerMinutes--;
      }
      timerMinutes = constrain(timerMinutes, 0, 1440);
      lcd.setCursor(0, 1);
      lcd.print("       ");
      lcd.setCursor(0, 1);
      lcd.print(timerMinutes);
      lcd.print(" min");
    }
    lastEncoderState = encoderState;
  }

  delay(200); // Debouncing
}

void controlTemperature() {
  if (currentTemp < targetTemp) {
    digitalWrite(RELAY_HEATER, HIGH);
    digitalWrite(RELAY_FAN, LOW);
  } else {
    digitalWrite(RELAY_HEATER, LOW);
    digitalWrite(RELAY_FAN, HIGH);
  }
}