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

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define REED_SWITCH_PIN 2 // Pin where the reed switch is connected
#define DHTPIN 3          // Pin where the DHT22 sensor is connected
#define DHTTYPE DHT22     // DHT 22 (AM2302)

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();
  
  // Initialize the reed switch pin as an input
  pinMode(REED_SWITCH_PIN, INPUT_PULLUP);

  // Initialize the SSD1306 display
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Pass 0x3C as the I2C address
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.display();
  delay(2000); // Pause for 2 seconds
  
  // Clear the buffer
  display.clearDisplay();
  display.setTextSize(2);  // Set the text size to 1
  display.setTextColor(SSD1306_WHITE);
  display.setFont(NULL);  // Use the default 5x7 font
}

void loop() {
  // Read the state of the reed switch
  int reedState = digitalRead(REED_SWITCH_PIN);
  
  // Clear the display buffer
  display.clearDisplay();

  if (reedState == HIGH) {
    // Garage door is open
    display.setCursor(0, 10);
    display.println("  Garage     open");
  } else {
    // Garage door is shut
    // Read temperature and humidity from DHT22
    float h = dht.readHumidity();
    float t = dht.readTemperature();
    
    // Check if any reads failed and exit early (to try again).
    if (isnan(h) || isnan(t)) {
      Serial.println(F("Failed to read from DHT sensor!"));
      return;
    }

    // Display the temperature and humidity
    display.setCursor(0, 10);
    display.print("T: ");
    display.print(t);
    display.println(" C");
    
    display.setCursor(0, 30);
    display.print("H: ");
    display.print(h);
    display.println(" %");
  }

  // Update the display with the new information
  display.display();
  
  // Small delay to avoid rapid updates
  delay(2000);
}