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

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

WiFiClient client;
long myChannelNumber = 2729019;
const char *myWriteAPIKey = "CL9YNLVFSCQBW2L0";
int statusCode;

const int pirPin = 2;           // PIR motion sensor pin
const int greenLedPin = 12;     // Green LED pin
const int redLedPin = 13;       // Red LED pin
const int buzzerPin = 4;        // Buzzer pin

const int lcdColumns = 21;      // LCD column size
const int lcdRows = 2;          // LCD row size

int R = 0, B = 0, M = 0;        // Variables for ThingSpeak fields

LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);  // Initialize LCD
Servo servo;                   // Initialize Servo object

void setup() {
  pinMode(pirPin, INPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  servo.attach(18);  // Attach servo to pin 18

  Serial.begin(115200);  // Start serial communication
  WiFi.mode(WIFI_STA);    // Set WiFi to station mode
  ThingSpeak.begin(client);  // Initialize ThingSpeak

  lcd.init();  // Initialize LCD
  lcd.backlight();  // Turn on LCD backlight
  lcd.print("Anti-Theft System");
  delay(2000);  // Initial display time

  servo.write(90);  // Set servo to 0 degrees (open door)
  randomSeed(analogRead(0));  // Initialize random number generator for sensor (optional)
}

void loop() {
  // Check WiFi connection
  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.");
  }

  delay(5000);  // Delay to give time for WiFi to connect (if not already connected)

  // Check PIR sensor state
  int pirState = digitalRead(pirPin);
  Serial.println(pirState);  // Debugging: Print PIR state (0 = no motion, 1 = motion detected)

  if (pirState == HIGH) {  // Motion detected
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Motion Detected!");
    
    digitalWrite(redLedPin, HIGH);  // Turn on red LED (indicating alarm)
    tone(buzzerPin, 500);  // Activate buzzer at 2000Hz
    Serial. println(" Door 0 degre");
    servo.write(0);  // Move servo to 90 degrees (close door)
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Door Closed");

    R = 1;  // Update status for ThingSpeak (red LED on)
    B = 1;  // Update status for ThingSpeak (buzzer on)
    M = 1;  // Update status for ThingSpeak (motion detected)
    delay(2000);  // Short delay before next loop iteration
  } else {  // No motion detected
    noTone(buzzerPin);  // Turn off buzzer
    digitalWrite(redLedPin, LOW);  // Turn off red LED
    Serial. println(" Door Open");
    servo.write(90) ;
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Door Open");
e
    R = 0;  // Update status for ThingSpeak (red LED off)
    B = 0;  // Update status for ThingSpeak (buzzer off)
    M = 0;  // Update status for ThingSpeak (no motion)
    delay(2000);  // Short delay before next loop iteration
  }

  // Update ThingSpeak fields with sensor data
  ThingSpeak.setField(1, B);  // Field 1: Buzzer status (0 or 1)
  ThingSpeak.setField(2, M);  // Field 2: Motion detection status (0 or 1)
  ThingSpeak.setField(3, R);  // Field 3: Red LED status (0 or 1)

  // Write data to ThingSpeak
  statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

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

  delay(5000);  // Wait for 5 seconds before the next loop
}