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

#define a 2
#define b 3
#define c 4

//Variable Waktu untuk Stopwatch dan Countdown
int timer = 0;
int s;              
int m;
int h;

//Variable EEPROM Stopwatch dan Countdown
int clk;            

//Variable EEPROM LCD
int LCD;            

//Variable EEPROM Buzzer
int BZR;

//variable Menu
int menu=0;         

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup(){
  pinMode(a, INPUT_PULLUP);
  pinMode(b, INPUT_PULLUP);
  pinMode(c, INPUT_PULLUP);
  lcd.begin(16, 2);
  lcd.clear();
  buzzer();
  lcd.backlight();
  lcd.setCursor(1, 0);
  lcd.println("SELAMAT DATANG");
  lcd.setCursor(2, 1);
  lcd.println("PROGRAM MENU");
  if(EEPROM.read(LCD) == 1){
    lcd.noBacklight();
  }else{
    lcd.backlight();
  }
}

void loop(){
  //main menu
  if(digitalRead(a) == LOW){
    menu++;
    if(menu > 5){
      menu = 1;
    }
    buzzer();
    lcd.clear();
    lcd.setCursor(2, 0);
    lcd.print("PILIH MENU : ");
    switch(menu){
      case 1:
      lcd.setCursor(4, 1);
      lcd.println("1. Start");
      break;
      case 2:
      lcd.setCursor(4, 1);
      lcd.println("2. Stop");
      break;
      case 3:
      lcd.setCursor(4, 1);
      lcd.println("3. Reset");
      break;
      case 4:
      lcd.setCursor(4, 1);
      lcd.println("4. Mode");
      break;
      case 5:
      lcd.setCursor(4, 1);
      lcd.println("5. Setting");
      break;
    }
    delay(250);
  }
  if(digitalRead(b) == LOW){
    menu--;
    if(menu < 1){
      menu = 5;
    }
    buzzer();
    lcd.clear();
    lcd.setCursor(2, 0);
    lcd.print("PILIH MENU : ");
    switch(menu){
      case 1:
      lcd.setCursor(4, 1);
      lcd.println("1. Start");
      break;
      case 2:
      lcd.setCursor(4, 1);
      lcd.println("2. Stop");
      break;
      case 3:
      lcd.setCursor(4, 1);
      lcd.println("3. Reset");
      break;
      case 4:
      lcd.setCursor(4, 1);
      lcd.println("4.Mode");
      break;
      case 5:
      lcd.setCursor(4, 1);
      lcd.println("5.Setting");
      break;
    }
    delay(250);
  }
  if(digitalRead(c) == LOW){
    if(menu == 1){
      buzzer();
      if(EEPROM.read(clk) == 5){
        for(s = 30 ; s > 0 ; s--){
        lcd.clear();
        lcd.setCursor(2, 0);
        lcd.print("Countdown :");
        lcd.setCursor(2, 1);
        lcd.print("0");
        lcd.setCursor(4, 1);
        lcd.println(" : ");
        lcd.setCursor(7, 1);
        lcd.println("0");
        lcd.setCursor(9, 1);
        lcd.println(" : ");
        lcd.setCursor(12, 1);
        lcd.println(s);
        delay(1000);
        menu = 0;
        }
      }
      else if(EEPROM.read(clk) == 6){
        for(s = 60 ; s > 0 ; s--){
          lcd.clear();
          lcd.setCursor(2, 0);
          lcd.print("Countdown :");
          lcd.setCursor(2, 1);
          lcd.print("00");
          lcd.setCursor(4, 1);
          lcd.println(" : ");
          lcd.setCursor(7, 1);
          lcd.println("00");
          lcd.setCursor(9, 1);
          lcd.println(" : ");
          lcd.setCursor(12, 1);
          lcd.println(s);
          delay(1000);
          menu = 0;
        }
      }else if(EEPROM.read(clk) == 7){
        for(s = 0 ; s < 60 ; s++){
          for(m = 0 ; m < 60 ; m++){
            for(h = 0 ; h < 60 ; h++){
            lcd.clear();
            lcd.setCursor(2, 0);
            lcd.print("Stopwatch :");
            lcd.setCursor(2, 1);
            lcd.print(timer / 3600);
            lcd.setCursor(4, 1);
            lcd.println(" : ");
            lcd.setCursor(7, 1);
            lcd.println(timer / 60 % 60);
            lcd.setCursor(9, 1);
            lcd.println(" : ");
            lcd.setCursor(12, 1);
            lcd.println(timer % 60);
            delay(1000);
            timer++;
            menu = 0;
            }
          }
        }
      }
    }
    if(menu == 4){
      buzzer();
      lcd.clear();
      lcd.setCursor(2, 0);
      lcd.println("1. Stopwatch");
      lcd.setCursor(2, 1);
      lcd.println("2. Countdown");
      delay(250);
      while(menu == 4){
        if(digitalRead(a) == LOW){
          buzzer();
          lcd.clear();
          lcd.setCursor(1, 0);
          lcd.println("Anda Memilih :");
          lcd.setCursor(3, 1);
          lcd.println("Stopwatch");
          EEPROM.write(clk, 7);
          delay(250);
          menu = 0;
        }
        if(digitalRead(b) == LOW){
          buzzer();
          menu = 500;
        }
      }
    }
    if(menu == 5){
      buzzer();
      lcd.clear();
      lcd.setCursor(2, 0);
      lcd.println("1. LCD");
      lcd.setCursor(2, 1);
      lcd.println("2. Buzzer");
      delay(250);
      while(menu == 5){
        if(digitalRead(a) == LOW){
          buzzer();
          lcd.clear();
          lcd.setCursor(2, 0);
          lcd.println("LCD ON");
          lcd.setCursor(2, 1);
          lcd.println("LCD OFF");
          delay(250);
          menu = 1000;
        }
        if(digitalRead(b) == LOW){
          buzzer();
          lcd.clear();
          lcd.setCursor(2, 0);
          lcd.println("Buzzer ON");
          lcd.setCursor(2, 1);
          lcd.println("Buzzer OFF");
          delay(250);
          menu = 1500;
        }
      }
    }
    //sub menu
    if (menu == 500) {
      lcd.clear();
      lcd.setCursor(2, 0);
      lcd.println("1. 30 Detik");
      lcd.setCursor(2, 1);
      lcd.println("2. 1 Menit");
      while (menu == 500) {
        if (digitalRead(a) == LOW) {
          buzzer();
          lcd.clear();
          lcd.setCursor(1, 0);
          lcd.println("Anda Memilih :");
          lcd.setCursor(4, 1);
          lcd.println("30 Detik");
          EEPROM.write(clk, 5);
          delay(250);
          menu = 0;
        }
        if (digitalRead(b) == LOW) {
          buzzer();
          lcd.clear();
          lcd.setCursor(1, 0);
          lcd.println("Anda Memilih :");
          lcd.setCursor(4, 1);
          lcd.println("1 Menit");
          EEPROM.write(clk, 6);
          delay(250);
          menu = 0;
        }
      }
    }
    if(menu == 1000){
      while(menu == 1000){
        if(digitalRead(a) == LOW){
          buzzer();
          lcd.clear();
          lcd.setCursor(1, 0);
          lcd.println("Anda Memilih :");
          lcd.setCursor(5, 1);
          lcd.println("LCD ON");
          lcd.backlight();
          EEPROM.write(LCD, 0);
          delay(100);
          menu = 0;
        }
        if(digitalRead(b) == LOW){
          buzzer();
          lcd.clear();
          lcd.setCursor(1, 0);
          lcd.println("Anda Memilih :");
          lcd.setCursor(5, 1);
          lcd.println("LCD OFF");
          lcd.noBacklight();
          EEPROM.write(LCD, 1);
          delay(100);
          menu = 0;
        }
      }
    }
    if(menu == 1500){
      while(menu == 1500){
        if(digitalRead(a) == LOW){
          buzzer();
          lcd.clear();
          lcd.setCursor(1, 0);
          lcd.println("Anda Memilih :");
          lcd.setCursor(3, 1);
          lcd.print("Buzzer ON");
          EEPROM.write(BZR, 3);
          delay(100);
          menu = 0;
        }
        if(digitalRead(b) == LOW){
          buzzer();
          lcd.clear();
          lcd.setCursor(1, 0);
          lcd.println("Anda Memilih :");
          lcd.setCursor(3, 1);
          lcd.print("Buzzer OFF");
          EEPROM.write(BZR, 4);
          delay(100);
          menu = 0;
        }
        delay(100);
      }
    }
  }
}

void buzzer(){
  if(EEPROM.read(BZR) == 4){
    noTone(12);
  }else{
    tone(12, 500);
    delay(100);
    noTone(12);
    delay(100);
  }
}