#include <WiFi.h>
#include <HTTPClient.h>
#include <Keypad.h>
#include <Servo.h>

const uint8_t LEDS = 12;
#include <LiquidCrystal.h>

#define codeLength 5
Servo myservo;
char Code[codeLength];
char PassW[codeLength] = "1234";
byte keycount = 0;

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'}
};

LiquidCrystal lcd(13,11,9,8,7,6);
uint8_t rowPins[ROWS] = { 26, 22, 21, 20 }; 
uint8_t colPins[COLS] = { 19, 18, 17, 16 }; 

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

// WiFi and ThinkSpeak setup
const char* ssid = "Aryan's iPhone";
const char* password = "Hn@123459";
String apiKey = "PZ8I3H2QPJ8OW1SX";  // Get this from ThinkSpeak

void setup() 
{
  lcd.begin(16,2);
  lcd.print("Enter a Key:-");
  myservo.attach(28);

  // Connect to WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected to WiFi");
}

void loop()
{
  int pos;
  char customKey = customKeypad.getKey();
  if(customKey)
  {
     Code[keycount] = customKey;
     Serial.print(Code[keycount]);
     lcd.setCursor(5,1);
     lcd.print(Code[keycount]);
     keycount++;
  }
  if(keycount == codeLength - 1)
  {
    Serial.println("");
    if(!strcmp(Code, PassW))
    {
      Serial.println("Correct Password");
      lcd.clear();
      lcd.setCursor(0,1);
      lcd.print("correct Password");

      // Unlock door with servo
      for(pos = 90; pos <= 180; pos++) {
        myservo.write(pos);
        delay(40);
      }
      delay(1000);
      for(pos = 180; pos >= 90; pos--) {
        myservo.write(pos);
        delay(40);
      }

      // Send correct password event to ThinkSpeak
      sendToThinkSpeak("Correct");
    }
    else
    {
      Serial.println("Incorrect Password");
      delay(1000);

      // Send incorrect password event to ThinkSpeak
      sendToThinkSpeak("Incorrect");
    }
    deletecount();
  }
}

void deletecount()
{
  while(keycount != 0)
  {
    Code[keycount--] = 0;
  }
  return;
}

// Function to send data to ThinkSpeak
void sendToThinkSpeak(String status)
{
  if(WiFi.status() == WL_CONNECTED) 
  {
    HTTPClient http;
    String serverPath = "http://api.thingspeak.com/update?api_key=" + apiKey + "&field1=" + status;

    http.begin(serverPath.c_str());
    int httpResponseCode = http.GET();

    if (httpResponseCode > 0) {
      Serial.println("Data sent to ThinkSpeak successfully.");
    } else {
      Serial.println("Error sending data to ThinkSpeak.");
    }
    http.end();
  }
}