#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
Servo myservo;

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 5, 4, 3, 2 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; // Pins connected to R1, R2, R3, R4

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

String sifre = "1234";
String girilenSifre = "";
String daireNo = "";

bool aKontrol = false;
bool bKontrol = false;

void anaEkran()
{
  lcd.setCursor(0,0);
  lcd.print("Sifre girisi <<A>>");
  lcd.setCursor(0,2);
  lcd.print("Zil calmak <<B>>");
}
void ekranTemizlemeA()
{
  lcd.setCursor(0,0);
  lcd.print("Sifre gir ve <<D>>");
  lcd.setCursor(0,1);
  lcd.print("Sifre : ");
  lcd.setCursor(0,3);
  lcd.print("Zil calmak <<B>>");
}
void ekranTemizlemeB()
{
  lcd.setCursor(0,0);
  lcd.print("Daire no gir <<D>>");
  lcd.setCursor(0,1);
  lcd.print("Daire no : ");
  lcd.setCursor(0,3);
  lcd.print("Sifre girisi <<A>>");
}

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  myservo.attach(10);
}


void loop() {
  myservo.write(0);
  char key = keypad.getKey();
  
  //A EKRANI
  if(key == 'A')
  {
    aKontrol = true;
    lcd.clear();
    girilenSifre = "";
  } 
  if(!aKontrol)
  {
    if(!bKontrol)
      anaEkran();
  }

  else{
    ekranTemizlemeA();
    if (key != NO_KEY) {
      girilenSifre += key;
      if(girilenSifre == "A")
        girilenSifre = "";
      lcd.setCursor(8,1);
      lcd.print(girilenSifre);
    }
    if(key == 'D')
    {
      if(girilenSifre == "1234D")
      {
        lcd.setCursor(5,2);
        lcd.print("SIFRE DOGRU");
        myservo.write(180);
        delay(2000);
        girilenSifre="";
        lcd.clear();
        aKontrol = false;
        anaEkran();
      }
      else
      {
        lcd.setCursor(5,2);
        lcd.print("SIFRE YANLIS");
      }
    }
    if(key == 'C')
    {
      lcd.clear();
      girilenSifre = "";
      ekranTemizlemeA();
    }
    if(key == 'B')
    {
      aKontrol = false;
      daireNo = "";
    }
      
  }


  //B EKRANI
  if(key == 'B')
  {
    bKontrol = true;
    lcd.clear();
    daireNo = "";
  }
  if(!bKontrol)
  {
    if(!aKontrol)
      anaEkran();
  }
  else
  {
    ekranTemizlemeB();
    if (key != NO_KEY) {
      daireNo += key;
      if(daireNo == "B")
        daireNo = "";
      lcd.setCursor(12,1);
      lcd.print(daireNo);
    }
    if(key == 'D')
    {
      if(daireNo == "1D")
      {
        lcd.setCursor(5,2);
        lcd.print("Daire 1 zil");
        tone(1, 262, 2000);
        delay(2000);
        daireNo = "";
        lcd.clear();
        bKontrol = false;
        anaEkran();
      }
      else if(daireNo == "2D"){
        lcd.setCursor(5,2);
        lcd.print("Daire 2 zil");
        tone(11, 262, 2000);
        delay(2000);
        daireNo = "";
        lcd.clear();
        bKontrol = false;
        anaEkran();
      }
      else if(daireNo == "3D"){
        lcd.setCursor(5,2);
        lcd.print("Daire 2 zil");
        tone(12, 262, 2000);
        delay(2000);
        daireNo = "";
        lcd.clear();
        bKontrol = false;
        anaEkran();
      }
      else if(daireNo == "4D"){
        lcd.setCursor(5,2);
        lcd.print("Daire 4 zil");
        tone(13, 262, 2000);
        delay(2000);
        daireNo = "";
        lcd.clear();
        bKontrol = false;
        anaEkran();
      }
      else
      {
        lcd.setCursor(3,2);
        lcd.print("HATALI DAIRE NO");
      }
    }
    if(key == 'C')
    {
      lcd.clear();
      daireNo = "";
      ekranTemizlemeB();
    }
    if(key == 'A')
    {
      bKontrol = false;
      aKontrol = true;
      girilenSifre = "";
    }

  }


}