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

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

#define DHTPIN 4       // Pin connected to the DHT11
#define DHTTYPE DHT11  // DHT 11 Sensor
DHT dht(DHTPIN, DHTTYPE);

RTC_DS3231 rtc;         // Real-Time Clock object
unsigned long previousMillis = 0;
const long interval = 300000; // 5 minutes in milliseconds
float temperature;

void setup() {
  // Initialize Serial
  Serial.begin(115200);

  // Initialize OLED
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.display();
  delay(2000);
  display.clearDisplay();

  // Initialize DHT sensor
  dht.begin();

  // Initialize RTC
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }
  
  if (rtc.lostPower()) {
    Serial.println("RTC lost power, setting time!");
    // Set the date and time to the compilation time
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  // Display initial temperature
  temperature = dht.readTemperature();
}

void loop() {
  DateTime now = rtc.now();
  
  // Clear the display
  display.clearDisplay();
  
  // Display Date and Time
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.print("Date: ");
  display.print(now.day(), DEC);
  display.print('/');
  display.print(now.month(), DEC);
  display.print('/');
  display.print(now.year(), DEC);
  
  display.setCursor(0, 16);
  display.print("Time: ");
  display.print(now.hour(), DEC);
  display.print(':');
  display.print(now.minute(), DEC);
  display.print(':');
  display.print(now.second(), DEC);
  
  // Check if 5 minutes have passed to update the temperature
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    temperature = dht.readTemperature(); // Read new temperature value
  }
  
  // Display Temperature
  display.setCursor(0, 32);
  display.print("Temp: ");
  display.print(temperature);
  display.print(" C");
  
  // Display everything
  display.display();
  
  delay(1000); // Update the display every second for time
}