#include <LiquidCrystal_I2C.h>
#include <Keypad.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);

/* Keypad setup */
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);

void setup() {
  // put your setup code here, to run once:
  lcd.init();
  lcd.backlight();

  showStartupMessage();
}

void loop() {
  // put your main code here, to run repeatedly:

}

// void lock() {
//   lockServo.write(SERVO_LOCK_POS);
//   safeState.lock();
// }

// void unlock() {
//   lockServo.write(SERVO_UNLOCK_POS);
// }

void showStartupMessage() {
  lcd.setCursor(6, 1);
  lcd.print("Welcome!");
  delay(1000);

  lcd.setCursor(4, 2);
  String message = "Smart House";
  for (byte i = 0; i < message.length(); i++) {
    lcd.print(message[i]);
    delay(100);
  }
  delay(500);
}

String inputSecretCode() {
  lcd.setCursor(5, 1);
  lcd.print("[____]");
  lcd.setCursor(6, 1);
  String result = "";
  while (result.length() < 4) {
    char key = keypad.getKey();
    if (key >= '0' && key <= '9') {
      lcd.print('*');
      result += key;
    }
  }
  return result;
}

void showWaitScreen(int delayMillis) {
  lcd.setCursor(2, 1);
  lcd.print("[..........]");
  lcd.setCursor(3, 1);
  for (byte i = 0; i < 10; i++) {
    delay(delayMillis);
    lcd.print("=");
  }
}

bool setNewCode() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Enter new password:");
  String newCode = inputSecretCode();

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Confirm new password");
  String confirmCode = inputSecretCode();

  if (newCode.equals(confirmCode)) {
    setCode(newCode);
    return true;
  } else {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Password doesn't match");
    lcd.setCursor(3, 1);
    lcd.print("Door is not locked!");
    delay(2000);
    return false;
  }
}

void showUnlockMessage() {
  lcd.clear();

  lcd.setCursor(4, 0);
  lcd.print("Door Unlocked!");
  delay(1000);
}

void safeUnlockedLogic() {
  lcd.clear();

  lcd.setCursor(0, 0);
  lcd.print("Press # to lock the door");

  bool newCodeNeeded = true;

  if (safeState.hasCode()) {
    lcd.setCursor(0, 2);
    lcd.print("Press A = set new password");
    newCodeNeeded = false;
  }

  auto key = keypad.getKey();
  while (key != 'A' && key != '#') {
    key = keypad.getKey();
  }

  bool readyToLock = true;
  if (key == 'A' || newCodeNeeded) {
    readyToLock = setNewCode();
  }

  if (readyToLock) {
    
    safeState.lock();
    lock();
    showWaitScreen(100);
  }
}

void safeLockedLogic() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.write(ICON_LOCKED_CHAR);
  lcd.print(" Door Locked! ");
  lcd.write(ICON_LOCKED_CHAR);

  String userCode = inputSecretCode();
  bool unlockedSuccessfully = safeState.unlock(userCode);
  showWaitScreen(200);

  if (unlockedSuccessfully) {
    showUnlockMessage();
    unlock();
  } else {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Access Denied!");
    showWaitScreen(1000);
  }
}

/*--------------------------Project Notes--------------------------*/
// This project covers the whole subject.
// The assigment subjectives on E-learning.
// we need multiplexer to connect all the items, we build it using logic gates.
// search for multiplexer circuit diagram (https://images.app.goo.gl/KthhiWZewi6oRdUX7).

// write a code to set and change the password - for ex = press # and * to change the password.
// we need to write a documant about the project in the solution file.
// servo motors use (PWM) pins.

/*--------------------------Project Objectives--------------------------*/
// 1-	Open main door with password 
// 2-	Open kitchen door according to distance sensor value
// 3-	Display temperature and humidity on LCD screen
// 4-	Remote control to open windows according to key press value from 0 degree to 180 degree ( depends on time key pressed) keys right and left.