#include <MAX6675_Thermocouple.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <RotaryEncoder.h>

// Pin tanımlamaları
int thermoDO = 2;
int thermoCS = 3;
int thermoCLK = 4;

const int button1Pin = 7;
const int button4Pin = 10;
const int relayPin = 11;
const int buzzerpin = 12;

const int encoderPinA = 5;
const int encoderPinB = 6;

// Kütüphane ve nesne oluşturma
MAX6675_Thermocouple thermocouple(thermoCLK, thermoCS, thermoDO);
LiquidCrystal_I2C lcd(0x27, 20, 4);
RotaryEncoder encoder(encoderPinA, encoderPinB);

int setPoint = 0;
int ayarZaman = 0;
unsigned long baslangicZamani = 0;
bool settingMode = false;
bool isAyarIsSelected = true; // true: ayar ısı, false: ayar zaman
bool relayActive = false;
bool buzzeractive = false;
bool countdownStarted = false;

void setup() {
  pinMode(button1Pin, INPUT_PULLUP);
  pinMode(button4Pin, INPUT_PULLUP);
  pinMode(relayPin, OUTPUT);
  pinMode(buzzerpin, OUTPUT);

  lcd.init();
  lcd.clear();
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("Mevcut ISI :");
  lcd.setCursor(1, 1);
  lcd.print("Ayar ISI  : >");
  lcd.setCursor(1, 2);
  lcd.print("Ayar Zaman:");
  lcd.setCursor(0, 3);
  lcd.print("Gecen Zaman:");

  encoder.setPosition(0); // Encoder'ın başlangıç pozisyonu
}

void loop() {
  double temp = thermocouple.readCelsius();
  lcd.setCursor(12, 0);
  lcd.print(temp);
  delay (150);
  lcd.print("'C");

  lcd.setCursor(12, 1);
  lcd.print(setPoint);
  lcd.print("'C");

  lcd.setCursor(12, 2);
  lcd.print(ayarZaman / 60);
  lcd.print("dk");
  lcd.print(ayarZaman % 60);
  lcd.setCursor(18, 2);
  lcd.print("sn");

  unsigned long currentTime = millis();
  int gecenZaman = (currentTime - baslangicZamani) / 1000;

  if (!countdownStarted) {
    gecenZaman = 0;
  }

  lcd.setCursor(12, 3);
  lcd.print(gecenZaman / 60);
  lcd.print("dk");
  lcd.print(gecenZaman % 60);
  lcd.setCursor(18, 3);
  lcd.print("sn");

  if (digitalRead(button1Pin) == LOW) {
    delay(1000);
    if (digitalRead(button1Pin) == LOW) {
      isAyarIsSelected = !isAyarIsSelected;
      if (isAyarIsSelected) {
        lcd.setCursor(0, 1);
        lcd.print(">");
        lcd.setCursor(0, 2);
        lcd.print(" ");
      } else {
        lcd.setCursor(0, 1);
        lcd.print(" ");
        lcd.setCursor(0, 2);
        lcd.print(">");
      }
      delay(300);
    }
  }

  encoder.tick();
  int newPos = encoder.getPosition();
  static int oldPos = 0;

  if (newPos != oldPos) {
    if (newPos > oldPos) {
      if (isAyarIsSelected) {
        setPoint++;
      } else {
        ayarZaman++;
      }
    } else {
      if (isAyarIsSelected) {
        setPoint--;
      } else {
        ayarZaman--;
      }
    }
    oldPos = newPos;
  }

  if (digitalRead(button4Pin) == LOW) {
    delay(200);
    if (digitalRead(button4Pin) == LOW) {
      buzzeractive = true;
      relayActive = true;
      baslangicZamani = millis();
      countdownStarted = true;
      delay(300);
    }
  }

  if (buzzeractive) {
    if (gecenZaman == ayarZaman) {
      digitalWrite(buzzerpin, HIGH);
      delay(3000);
      digitalWrite(buzzerpin, LOW);
    } else {
      digitalWrite(buzzerpin, LOW);
    }
  }

  if (relayActive) {
    if (temp < setPoint && gecenZaman < ayarZaman) {
      digitalWrite(relayPin, HIGH);
    } else {
      digitalWrite(relayPin, LOW);
      if (gecenZaman >= ayarZaman) {
        relayActive = false;
        countdownStarted = false;
      }
    }
  } else {
    digitalWrite(relayPin, LOW);
  }
}