#include <DHT.h>
#include <Keypad.h>
#include <IRremote.h>
#include <Servo.h>
#include <LiquidCrystal_I2C.h>
// Readme: Bấm nút "#" để nhập mật khẩu mở cửa khi cửa đóng và nhấn "#" để đóng cửa khi cửa mở
//        Ở remote: phím 1 đến bật đèn, phím nguồn để tắt đèn 
// Pin Definitions
#define DHTPIN 10
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

// Keypad setup
const byte ROW_NUM = 4;
const byte COLUMN_NUM = 4;
char keys[ROW_NUM][COLUMN_NUM] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte pin_rows[ROW_NUM] = {2, 3, 4, 5};
byte pin_column[COLUMN_NUM] = {6, 7, 8, 9};
Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM);

// IR Remote setup
int recv_pin = 11;
IRrecv irrecv(recv_pin);
// decode_results results;

// Servo setup for door control
Servo myServo;
int servoPin = 13;

// LED setup for light control
int lightPin = 12;

// LCD setup
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Variables for password and door state
String password = "1234";
String enteredPassword = "";
bool doorOpen = false;

void setup() {
  Serial.begin(9600);
  dht.begin();
  myServo.attach(servoPin);
  myServo.write(0);  // Start with the door closed
  irrecv.enableIRIn();
  lcd.begin(16, 2);
  lcd.setBacklight(LOW);
  pinMode(lightPin, OUTPUT);
}

void loop() {

  char key = keypad.getKey();
  if (key == '#') {
    if (doorOpen) {
      // Close the door if it's open
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Closing Door...");
      myServo.write(0);
      doorOpen = false;
    
    } else {
      // Prompt for password if the door is closed
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Enter Password:");
      enteredPassword = "";
      while (true) {
        key = keypad.getKey();
        if (key) {
          if (key == '#') { // Check the password on '#'
            if (enteredPassword == password) {
              lcd.clear();
              lcd.setCursor(0, 0);
              lcd.print("Opening Door...!");
              myServo.write(90); // Open the door
              doorOpen = true;
              delay(500);
              break;
            } else {
              lcd.clear();
              lcd.setCursor(0, 0);
              lcd.print("Incorrect Pass");
              delay(500);
              lcd.clear();
              lcd.setCursor(0, 0);
              lcd.print("Enter Password:");
              enteredPassword = "";
            }
          } else if (key == '*') {
            enteredPassword = ""; // Reset password on '*'
            lcd.setCursor(0, 1);
            lcd.print("                ");
          } else if(key=='A'){
            break;
          } else{
            enteredPassword += key; // Add key to password
            lcd.setCursor(0, 1);
            lcd.print(enteredPassword);
          }
        }
      }
    }
  } 
  if(key=='*'){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Enter a new password");
      password="";
      while(true){
        key=keypad.getKey();
        if(key){
          if(key=='#'){
            lcd.clear();
            lcd.setCursor(0,0);
            lcd.print("Password is set");
            delay(1000);
            break;
          }
          else {
            password+=key;
        }
      }
    }
  }
  // Display temperature and humidity on LCD
  float temp = dht.readTemperature();
  float humidity = dht.readHumidity();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: " + String(temp) + " C");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: " + String(humidity) + " %");
  delay(500);  // Update every 0.5 seconds

  // Check for door control with the '#' key
 

  // IR remote light control
  if (irrecv.decode()) {
    Serial.println(irrecv.decodedIRData.command);
    // Bật bằng 1
    if (irrecv.decodedIRData.command == 48) {
      digitalWrite(lightPin, HIGH);
      lcd.setCursor(0, 1);
      lcd.clear();
      lcd.print("Light ON");
      delay(1000);
    } else if (irrecv.decodedIRData.command == 162) {
    // Tắt bằng nút tắt nguồn
      digitalWrite(lightPin, LOW);
      lcd.clear();
      lcd.setCursor(0, 1);
      lcd.print("Light OFF");
      delay(1000);
    }
    irrecv.resume();
  }
}