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

// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);

int currentMenuItem = 0;
int lastState = 0;
int up = A3;
int down = A4;
int enter = A5;

void setup() {
  pinMode(up, INPUT_PULLUP);
  pinMode(down, INPUT_PULLUP);
  pinMode(enter, INPUT_PULLUP);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("LCD MENU DENGAN");
  lcd.setCursor(0,1);
  lcd.print("PUSH BUTTON");
  delay(5000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("PILIH PRODI ANDA");
  lcd.setCursor(0,1);
  lcd.print("TEKAN DOWN");
}

void loop() {
  mainmenu();
}

void mainmenu() {
  int state = 0;
  if (digitalRead(up) == LOW) {
    state = 1; 
  } else if (digitalRead(down) == LOW) {
    state = 2;
  } else if (digitalRead(enter) == LOW) {
    state = 3;
  }
  
  if (currentMenuItem < 0 || currentMenuItem > 5) {
    currentMenuItem = 0;
  }
  
  if (state != lastState) {
    if (state == 1) {
      currentMenuItem = currentMenuItem - 1;
      displayMenu(currentMenuItem);
    } else if (state == 2) {
      currentMenuItem = currentMenuItem + 1;
      displayMenu(currentMenuItem);
    } else if (state == 3) {
      selectMenu(currentMenuItem);
    }
    lastState = state;
  }
  delay(5);
}

void displayMenu(int x) {
  switch (x) {
    case 1:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("*FARMASI");
      lcd.setCursor(0, 1);
      lcd.print(" FISIO");
      break;
    case 2:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print(" FARMASI");
      lcd.setCursor(0, 1);
      lcd.print("*FISIO");
      break;
    case 3:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("*TEM");
      lcd.setCursor(0, 1);
      lcd.print("ANKES");
      break;
    case 4:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print(" TEM");
      lcd.setCursor(0, 1);
      lcd.print("*ANKES");
      break;
    case 5:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print(" ANKES");
      lcd.setCursor(0, 1);
      lcd.print("*RMIK");
      break;
  }
}

void selectMenu(int x) {
  switch (x) {
    case 1:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("SELAMAT");
      lcd.setCursor(0, 1);
      lcd.print("ANDA MEMILIH FARMASI");
      break;
    case 2:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("SELAMAT");
      lcd.setCursor(0, 1);
      lcd.print("ANDA MEMILIH FISIO");
      break;
    case 3:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("SELAMAT");
      lcd.setCursor(0, 1);
      lcd.print("ANDA MEMILIH TEM");
      break;
    case 4:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("SELAMAT");
      lcd.setCursor(0, 1);
      lcd.print("ANDA MEMILIH ANKES");
      break;
    case 5:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("SELAMAT");
      lcd.setCursor(0, 1);
      lcd.print("ANDA MEMILIH RMIK");
      break;
  }
}