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

#define PIR_PIN 0
#define BUZZER_PIN 1
#define BUTTON_PIN 4
#define SERVO_PIN 6
#define KEYPAD_PIN A0

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] = {5, 4, 3, 2}; 
byte colPins[COLS] = {A3, A2, A1, A0}; 
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
Servo servoMotor;

enum SystemState {
  ID,
  MOTION_DETECTED,
  ENTER_PASSCODE,
  DOOR_OPENED,
  DOOR_CLOSED
};

SystemState currentState = ID;
bool personInside = false;

void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT);
  
  lcd.begin(16, 2);
  servoMotor.attach(SERVO_PIN);
}

void loop() {
  switch(currentState) {
    case ID:
      handleIdleState();
      break;
    case MOTION_DETECTED:
      handleMotionDetectedState();
      break;
    case ENTER_PASSCODE:
      handleEnterPasscodeState();
      break;
    case DOOR_OPENED:
      handleDoorOpenedState();
      break;
    case DOOR_CLOSED:
      handleDoorClosedState();
      break;
  }
}

void handleIdleState() {
  bool motionDetected = digitalRead(PIR_PIN);
  if (motionDetected) {
    tone(BUZZER_PIN, 1000, 1000); // تنشيط الإنذار عند اكتشاف حركة
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Motion detected");
    currentState = MOTION_DETECTED;
  } else {
    deactivateAlarm();
    lcd.clear();
    lcd.print("No motion detected");
  }
  delay(500);
}

void handleMotionDetectedState() {
  char key = keypad.getKey();
  if (key == '#') {
    lcd.clear();
    lcd.print("Enter passcode:");
    currentState = ENTER_PASSCODE;
  }
  delay(500);
}

void handleEnterPasscodeState() {
  char key = keypad.getKey();
  if (key) {
    if (key == '#') {
      personInside = true;
      openDoor();
      lcd.clear();
      lcd.print("Door opened");
      lcd.setCursor(0, 1);
      lcd.print("Welcome!");
      delay(5000);
      currentState = DOOR_OPENED;
    }
  }
}

void handleDoorOpenedState() {
  bool buttonPressed = digitalRead(BUTTON_PIN);
  if (buttonPressed && personInside) {
    personInside = false;
    closeDoor();
    lcd.clear();
    lcd.print("Door closed");
    delay(2000);
    currentState = DOOR_CLOSED;
  }
  delay(500);
}

void handleDoorClosedState() {
  currentState = ID;
}

void deactivateAlarm() {
  noTone(BUZZER_PIN);
}

void openDoor() {
  servoMotor.write(90);
}

void closeDoor() {
  servoMotor.write(0);
}