#include <OneWire.h>
#include <DallasTemperature.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 for a 20 chars and 4 line display
LiquidCrystal_I2C lcd(0x27, 20, 4);

// Data wire is connected to the Arduino digital pin 4
#define ONE_WIRE_BUS 4

// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature sensor
DallasTemperature sensors(&oneWire);

// Define the pins for the relays
const int isitici = 8;
const int karistirici = 9;
const int bardakAktar = 10;
const int controlPin = 11;  // Pin to start the process

// Time to wait after temperature reaches 95°C
const unsigned long bekleme = 20000; // 20000 milliseconds = 20 seconds
unsigned long startTime = 0;
bool tempReached = false;
bool waitPeriod = false;

void setup(void) {
  // Start serial communication for debugging purposes
  Serial.begin(9600);
  // Start up the library
  sensors.begin();
  // Initialize the LCD
  lcd.init();
  lcd.backlight();
  // Initialize the relay pins as outputs
  pinMode(isitici, OUTPUT);
  pinMode(karistirici, OUTPUT);
  pinMode(bardakAktar, OUTPUT);
  pinMode(controlPin, INPUT_PULLUP);
  // Initially turn off the relays
  digitalWrite(isitici, LOW);
  digitalWrite(karistirici, LOW);
  digitalWrite(bardakAktar, LOW);
}

void loop(void) {
  // Read temperature
  sensors.requestTemperatures();
  float temperatureC = sensors.getTempCByIndex(0);

  // Display temperature on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperatureC);
  lcd.print(" C");

  // Check if control pin is HIGH to start the process
  if (digitalRead(controlPin) == HIGH) {
    // Turn on the stirrer
    digitalWrite(karistirici, HIGH);

    // Check if temperature has reached 95°C
    if (temperatureC >= 95) {
      if (!tempReached) {
        // Start the timer when temperature first reaches 95°C
        startTime = millis();
        tempReached = true;
        waitPeriod = true;
      }

      // Turn off the heater if temperature is 95°C or above
      digitalWrite(isitici, LOW);
      lcd.setCursor(0, 1);
      lcd.print("Isitici Kapali  ");
    } else {
      // Keep the heater on if temperature is below 95°C
      digitalWrite(isitici, HIGH);
      lcd.setCursor(0, 1);
      lcd.print("Isitici Acik    ");
    }

    // During the wait period, control the heater based on temperature
    if (waitPeriod) {
      // Display brewing process status
      unsigned long elapsedTime = millis() - startTime;
      lcd.setCursor(0, 3);
      lcd.print("Demlenme ");
      lcd.print(elapsedTime / 1000);
      lcd.print("/");
      lcd.print(bekleme / 1000);

      // Check if 20 seconds have passed since the temperature first reached 95°C
      if (elapsedTime >= bekleme) {
        // After 20 seconds, turn on the cup transfer mechanism
        digitalWrite(bardakAktar, HIGH);
        lcd.setCursor(0, 2);
        lcd.print("Bardak Aktarildi");
        delay(5000); // Let the cup transfer mechanism run for 5 seconds
        digitalWrite(bardakAktar, LOW);

        // Reset flags and state
        digitalWrite(isitici, LOW);
        digitalWrite(karistirici, LOW);
        tempReached = false;
        waitPeriod = false;
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Bekliyor...");

        // Wait for controlPin to go LOW and then HIGH again to restart the process
        while (digitalRead(controlPin) == HIGH) {
          delay(100);
        }
      }
    }
  } else {
    // If control pin is LOW, reset all relays and flags
    digitalWrite(isitici, LOW);
    digitalWrite(karistirici, LOW);
    digitalWrite(bardakAktar, LOW);

    // Reset flags and clear the display
    tempReached = false;
    waitPeriod = false;
    startTime = 0; // Reset startTime
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Bekliyor...");
  }

  delay(1000); // Wait for 1 second before next loop
}