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

//menamai
#define LCD_ADDRESS 0X27

#define t1 2
#define t2 3
#define t3 4

int currentHour = 0;
int currentMinute = 0;
int currentSecond = 0;

int alarmHour = 0;
int alarmMinute = 0;

enum MenuMode {
  DISPLAY_TIME,
  SET_ALARM_HOUR,
  SET_ALARM_MINUTE,
};

MenuMode menuMode = DISPLAY_TIME;


LiquidCrystal_I2C lcd(LCD_ADDRESS, 16, 2);

void setup() {
  Wire.begin();
  pinMode(t1, INPUT_PULLUP);
  pinMode(t2, INPUT_PULLUP);
  pinMode(t3, INPUT_PULLUP);
  lcd.init();
  lcd.backlight();
}

void loop() {
  lcd.clear();
  currentHour = 12;
  currentMinute = 30;
  currentSecond = 0;

switch(menuMode){
  case DISPLAY_TIME:

  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  lcd.print(currentHour);
  lcd.print(":");
  if(currentMinute < 10){
    lcd.print("0");
  }
  lcd.print(currentMinute);
  lcd.print(":");
  if(currentSecond < 10){
    lcd.print("0");
  }
  lcd.print(currentSecond);

  if(digitalRead(t3) == 0){
    menuMode = SET_ALARM_HOUR;
    delay(500);
  }
  break;

  case SET_ALARM_HOUR:
  //mengatur nilai alarm
  lcd.setCursor(0, 0);
  lcd.print("Set Alarm - Hour");
  lcd.setCursor(0, 1);
  lcd.print("Alarm: ");
  lcd.print(alarmHour);
  lcd.print(":");
  if(alarmMinute < 10){
    lcd.print("0");
  }
  lcd.print(alarmMinute);

  if(digitalRead(t1) == 0){
    //tombol 1 ditekan
    alarmHour++;
    if (alarmHour > 23){
      alarmHour = 0;
    }
  delay(500); //menunggu tombol dilepas
  }
    if(digitalRead(t2) == 0){
      //tombol 2 ditekan
      alarmHour--;
      if(alarmHour < 0){
        alarmHour = 23;
      }
      delay(500);
    }
    if(digitalRead(t3) == 0){
      menuMode = SET_ALARM_MINUTE;
      delay(500);
    }
    break;

    case SET_ALARM_MINUTE:
  lcd.setCursor(0, 0);
  lcd.print("Set Alarm - Minute");
  lcd.setCursor(0, 1);
  lcd.print("Alarm: ");
  lcd.print(alarmHour);
  lcd.print(":");
  lcd.print(alarmMinute);

  if(digitalRead(t1) == 0){

    alarmMinute++;
    if(alarmMinute > 59){
      alarmMinute = 0;
    }
    delay(500);
  }

  if(digitalRead(t2) == 0){

    alarmMinute--;
    if(alarmMinute < 0){
      alarmMinute = 59;
    }
    delay(500);
  }
  if(digitalRead(t3) == 0){

    menuMode = DISPLAY_TIME;
    delay(500);
  }
}
delay(100);
}