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

LiquidCrystal_I2C lcd(0x27, 16, 2); // Adjust the address if needed

const int selectButtonPin = 6;  // Pin for the select button
const int startButtonPin = 7;   // Pin for the start/stop button

int selectedPreset = 0;  // 0: No preset, 1: Rice, 2: Egg, 3: Lentil
int presets[] = {0, 1500, 720, 1200};  // Preset durations in seconds (0 for custom)

unsigned long startTime = 0;
bool timerRunning = false;

void setup() {
  lcd.begin(16, 2);
  lcd.backlight();
  pinMode(selectButtonPin, INPUT_PULLUP);
  pinMode(startButtonPin, INPUT_PULLUP);
}

void loop() {
  handleButtons();

  if (timerRunning) {
    displayTimer();
    checkTimer();
  } else {
    displayMenu();
  }

  delay(100);
}

void handleButtons() {
  if (digitalRead(selectButtonPin) == LOW) {
    selectPreset();
  }

  if (digitalRead(startButtonPin) == LOW) {
    startStopTimer();
  }
}

void selectPreset() {
  selectedPreset = (selectedPreset % 3) + 1; // Cycle through presets (1-3)
  displayPreset();
  delay(500);  // Debounce delay
}

void startStopTimer() {
  if (timerRunning) {
    stopTimer();
  } else {
    startTimer();
  }
  delay(500);  // Debounce delay
}

void startTimer() {
  if (selectedPreset > 0) {
    startTime = millis();
    timerRunning = true;
  }
}

void stopTimer() {
  timerRunning = false;
}

void displayPreset() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Selected Preset:");

  switch (selectedPreset) {
    case 1:
      lcd.setCursor(0, 1);
      lcd.print("Rice");
      break;
    case 2:
      lcd.setCursor(0, 1);
      lcd.print("Egg");
      break;
    case 3:
      lcd.setCursor(0, 1);
      lcd.print("Lentil");
      break;
    default:
      lcd.setCursor(0, 1);
      lcd.print("Custom");
  }
}

void displayMenu() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("1. Rice");
  lcd.setCursor(0, 1);
  lcd.print("2. Egg");
}

void displayTimer() {
  unsigned long currentTime = millis();
  unsigned long elapsedTime = (currentTime - startTime) / 1000;

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  lcd.print(elapsedTime / 60);
  lcd.print("m ");
  lcd.print(elapsedTime % 60);
  lcd.print("s");
}

void checkTimer() {
  unsigned long currentTime = millis();
  unsigned long elapsedTime = (currentTime - startTime) / 1000;

  if (elapsedTime >= presets[selectedPreset]) {
    stopTimer();
    buzzer();  // Add your buzzer function here
  }
}

void buzzer() {
  // Implement your buzzer function to indicate the end of the timer
  // For simplicity, you can toggle a pin or add more complex melody logic
  // For example:
  // digitalWrite(buzzerPin, HIGH);
  // delay(1000);
  // digitalWrite(buzzerPin, LOW);
}