#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include <Servo.h>
#define buzzer 12

Servo servo;

LiquidCrystal_I2C lcd(0x27, 16, 2);

// ===== Keypad setup =====
const byte ROWS = 4; 
const byte COLS = 4; 

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

byte rowPins[ROWS] = {9, 8, 7, 6}; 
byte colPins[COLS] = {5, 4, 3, 2}; 

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


const unsigned long NO_KEY_DEBOUNCE_MX = 1000;
unsigned loong noKeyStartMs = 0;
bool noKeyTiming = false

int maxinput = 4;

int lengthofpw = 4;

char password[4] = {'1','3','7','9'};

int currentkeyposition = 0;

char key[4] = {'0'};

void buzz1time(){
  digitalWrite(buzzer, HIGH);
  delay(1000);
  digitalWrite(buzzer,LOW);
  delay(200);
}

void buzz3times(){
  for (int i = 0; i < 3; i=i+1){
    digitalWrite(buzzer, HIGH);
    delay(300);
    digitalWrite(buzzer,LOW);
    delay(300);
  }
}

void cursororigin(){
  lcd.clear();
  lcd.setCursor(0,0);
}

void lockdoor(){
  servo.write(110);
  lcd.setCursor(2,1);
  lcd.print("DOOR LOCKED");
  buzz3times();
  delay(2000);
  lcd.clear();
}

void unlockdoor(){
  servo.write(-110);
  lcd.setCursor(2,1);
  lcd.print("DOOR UNLOCKED");
  buzz1time();
  delay(2000);
  lcd.clear();
}

void processnumberkey(char key){
  int a=1;
  lcd.setCursor(a, 1);
  lcd.print("*");
  a=a+1;
}

void pressedkeys(char keys){
  if (currentkeyposition<maxinput){
    key[currentkeyposition] = keys;
    currentkeyposition=currentkeyposition+1;
  }
}

bool checkpassword(){
  int z = 0;
  for (int i = 0; i < lengthofpw; i=i+1){
    if (key[i] == password[i]){
      z=z+1;
    }
  }
  if (z == 4){
    unlockdoor();
  }
  else{
    lcd.print("WRONG PASSWORD");
    buzz3times();
    delay(2000);
    lcd.clear();
  }
}

void setup() {
  lcd.init(); // Initialize LCD
  lcd.backlight(); // Turn on backlight
  pinMode(buzzer,OUTPUT);
}

void loop() {
  char keys = keypad.getKey();
}