#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include <WiFi.h>
#include <ThingSpeak.h>

#define RELAY_PIN   19 
#define ROW_NUM     4  
#define 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] = {12, 14, 27, 26};   
byte pin_column[COLUMN_NUM] = {25, 33, 32,17};  

Keypad keypad = Keypad( makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );

const String password_1 = "1234"; 
const String password_2 = "4444";  
const String password_3 = "ABCD";  
String input_password;

LiquidCrystal_I2C lcd(0x27, 16, 2); 

char ssid[] = "Wokwi-GUEST";
char pass[] = ""; 



WiFiClient client;
long myChannelNumber =    2686532;
const char * myWriteAPIKey = "TI5OZAMLR2UNK3JY";
int statusCode;




void setup() {
  Serial.begin(9600);
  input_password.reserve(32);    
  pinMode(RELAY_PIN, OUTPUT); 
  digitalWrite(RELAY_PIN, HIGH);
  lcd.init();                    
  lcd.backlight();

  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
}

void loop() {
  char key = keypad.getKey();

  if (key) {
    Serial.println(key);

    if (key == '*') {
      input_password = ""; 
      lcd.clear();
    } else if (key == '#') {
      lcd.clear();
      if (input_password == password_1 || input_password == password_2 || input_password == password_3) {
        Serial.println("Valid Password => unlock the door");
        lcd.setCursor(0, 0);
        lcd.print("CORRECT!");
        lcd.setCursor(0, 1);
        lcd.print("DOOR UNLOCKED!");

        digitalWrite(RELAY_PIN, LOW); 
        delay(20000);
        digitalWrite(RELAY_PIN, HIGH);
      } else {
        Serial.println("Invalid Password => Try again");
        lcd.setCursor(0, 0);
        lcd.print("INCORRECT!");
        lcd.setCursor(0, 1);
        lcd.print("ACCESS DENIED!");
      }

      input_password = "";
    } else {
      if (input_password.length() == 0) {
        lcd.clear();
      }

      input_password += key; 
      lcd.setCursor(input_password.length(), 0); 
      lcd.print('*');                 
    }
  }
  {
    if(WiFi.status() != WL_CONNECTED)  
  {
  Serial.print("Attempting to connect");
    while(WiFi.status() != WL_CONNECTED)
    {
    WiFi.begin(ssid, pass); 
    Serial.print(".");
    delay(5000);
    }
  Serial.println("\nConnected.");
  } 
  }
  {
     ThingSpeak.setField(1,"Door Opened 1" );
   ThingSpeak.setField(2,"Door Closed 2" );

  statusCode = ThingSpeak.writeFields(myChannelNumber,myWriteAPIKey);

if(statusCode == 200) { //successful writing code
Serial.println("Channel update successful.");
}
else {
Serial.println("Problem Writing data. HTTP error code :" +
String(statusCode));
}
  }
  
}