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

#define b1 2
#define b2 3
#define b3 4

//vARIABEL WAKTU SAAT INI
int currentHour = 0;
int currentMinute = 0;
int currentSecond =0;

//variabel waktu alarm
int alarmHour = 0;
int alarmMinute = 0;
// enumeric = enum
enum MenuMode
{
  Display_time,
  Set_alarm_hour,
  Set_alarm_min,
};

MenuMode menuMode = Display_time;

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  // put your setup code here, to run once:
  Wire.begin();
  pinMode(b1, INPUT_PULLUP);
  pinMode(b2, INPUT_PULLUP);
  pinMode(b3, INPUT_PULLUP);
  lcd.init();
  lcd.backlight();
  lcd.clear();
}

void loop() {
  // put your main code here, to run repeatedly:

  currentHour = 12;
  currentMinute = 30;
  currentSecond = 15;
    
  switch(menuMode)
  {
    case Display_time:
    //lcd.clear();
    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(b3) == LOW){
      menuMode = Set_alarm_hour;
      delay(500);
    }
    break;

    case Set_alarm_hour:
    lcd.setCursor(0, 0);
    lcd.print("Set Alarm - Hour");
    lcd.setCursor(0, 1);
    lcd.print("Alarm:");
    lcd.print(alarmHour);
    lcd.setCursor(8, 1);
    lcd.print(":");
    if(alarmMinute < 10)
    {
      lcd.print("0");
    }
       if(digitalRead(b2) == LOW ){ 
          alarmHour++;
          if(alarmHour > 23){
            alarmHour = 0;
          }
          delay(50); 
        }  

     if (digitalRead(b1) == LOW){
       alarmHour--;
       if(alarmHour < 0){
         alarmHour= 23;
       }
       delay(50); 
     }
    
    if(digitalRead(b3) == LOW){
      menuMode = Set_alarm_min;
      delay(500);
    }
    break;
    case Set_alarm_min:
    lcd.setCursor(0, 0);
    lcd.print("Set Alarm-minute");
    lcd.setCursor(0, 1);
    lcd.print("Alarm:");
    //lcd.setCursor(7, 1);
    lcd.print(alarmHour);
    lcd.setCursor(8, 1);
    lcd.print(":");
    lcd.print(alarmMinute);
       if(digitalRead(b2) == LOW ){ 
          alarmMinute++;
          if(alarmMinute > 59){
            alarmMinute =0;
          }
          delay(50); 
        }  
     if (digitalRead(b1) == LOW) {
       alarmMinute--;
       if(alarmMinute < 0){
            alarmMinute =59;
          }
        delay(50);
     }
     
    if(digitalRead(b3) == LOW){
      menuMode = Display_time;
      delay(500);
    }
    break;
    
  }
}