#include <WiFi.h>
#include <ESP32Servo.h>
#include <LiquidCrystal_I2C.h>
#include <ThingSpeak.h>

WiFiClient client;
long myChannelNumber = 2651307;
const char* myWriteAPIKey = "9KEHGRE598FZ1EIM";

#define SERVO_PIN 32
#define PIR_PIN 25 
#define BUZZER_PIN 19

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

int statusCode;
bool motionDetected = false;
bool doorLocked = true;  
Servo doorLock;
LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

void setup() {
  ThingSpeak.begin(client);
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, pass);  

  Serial.println("Hello, ESP32!");
  pinMode(PIR_PIN, INPUT); 
  pinMode(BUZZER_PIN, OUTPUT);

  doorLock.attach(SERVO_PIN);
  doorLock.write(0);

  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Smart Door Lock");
}

void loop() { 
  if (WiFi.status() != WL_CONNECTED) {
    Serial.print("Attempting to connect");
    while (WiFi.status() != WL_CONNECTED) {
      delay(1000);
      Serial.print(".");
    }
    Serial.println("\nConnected.");
  } 
  delay(10); 

  Serial.print("door is locked: ");
  Serial.println(doorLocked); 
  ThingSpeak.setField(1, doorLocked ? 1 : 0); 
  statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

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

  motionDetected = digitalRead(PIR_PIN);
  if (motionDetected && doorLocked) {
    unlockDoor();
  } else if (!doorLocked) {
    lockDoor();
  }

  delay(200);
}

void unlockDoor() {
  Serial.println("unlock");
  doorLock.write(90);

  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print("Motion Detected");
  LCD.setCursor(0, 1);
  LCD.print("Door is Unlocked");

  tone(BUZZER_PIN, 200);
  delay(100);
  noTone(BUZZER_PIN);
  delay(4500);   
  doorLocked = false;
}

void lockDoor() {
  Serial.println("lock");
  
  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print("Door is Locked");  
  doorLock.write(45);
  doorLocked = true;
}