#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>

// OLED display setup
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Pin definitions
#define PIR_PIN 2
#define GREEN_LED 3
#define RED_LED 4
#define DHTPIN 5
#define DHTTYPE DHT11  // Change to DHT22 if you're using that

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(GREEN_LED, OUTPUT);
  pinMode(RED_LED, OUTPUT);

  Serial.begin(9600);
  dht.begin();

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("Display initialization failed");
    while (true);
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 10);
  display.println("Initializing...");
  display.display();
  delay(1000);
}

void loop() {
  int motion = digitalRead(PIR_PIN);
  float temp = dht.readTemperature();
  float humidity = dht.readHumidity();

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);

  if (motion == HIGH) {
    digitalWrite(GREEN_LED, HIGH);
    digitalWrite(RED_LED, LOW);
    display.setCursor(0, 0);
    display.println("Door is opened");
  } else {
    digitalWrite(GREEN_LED, LOW);
    digitalWrite(RED_LED, HIGH);
    display.setCursor(0, 0);
    display.println("Door is closed");
  }

  // Display temperature and humidity
  display.setCursor(0, 20);
  if (isnan(temp) || isnan(humidity)) {
    display.println("Sensor error");
  } else {
    display.print("Temp: ");
    display.print(temp);
    display.println(" C");

    display.print("Humidity: ");
    display.print(humidity);
    display.println(" %");
  }

  display.display();
  delay(1000);  // Slightly longer delay to let sensor settle
}