#include <LedControl.h>
#include <RTClib.h>
#include <DHT.h>

#define DHTPIN 2        // Pin for the DHT sensor
#define DHTTYPE DHT22   // DHT 11 or DHT22

// MAX7219 Connections
LedControl lcDate = LedControl(3, 5, 4, 4);       // Date Module (DIN, CLK, CS)
LedControl lcTime = LedControl(6, 8, 7, 4);       // Time Module (DIN, CLK, CS)
LedControl lcYear = LedControl(9, 11, 10, 4);     // Year Module (DIN, CLK, CS)
LedControl lcTemp = LedControl(12, A0, 13, 4);    // Temperature Module (DIN, CLK, CS)
LedControl lcHum  = LedControl(A1, A3, A2, 4);    // Humidity Module (DIN, CLK, CS)

DHT dht(DHTPIN, DHTTYPE);
RTC_DS3231 rtc;

void setup() {
  Serial.begin(9600);
  dht.begin();
  rtc.begin();
  
  // Initialize all MAX7219 modules
  initializeModule(lcDate);
  initializeModule(lcTime);
  initializeModule(lcYear);
  initializeModule(lcTemp);
  initializeModule(lcHum);

  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  if (rtc.lostPower()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}

void initializeModule(LedControl lc) {
  lc.shutdown(0, false);      // Wake up display
  lc.setIntensity(0, 8);      // Set brightness level (0 is min, 15 is max)
  lc.clearDisplay(0);         // Clear display register
}

void loop() {
  DateTime now = rtc.now();
  float temp = dht.readTemperature();
  float humidity = dht.readHumidity();

  displayDateTime(now);
  displayYear(now.year());
  displayTemp(temp);
  displayHumidity(humidity);

  delay(1000);
}

void displayDateTime(DateTime now) {
  // Display Date (DDMM)
  int dateValue = now.day() * 100 + now.month();
  lcDate.setDigit(0, 3, dateValue % 10, false);
  lcDate.setDigit(0, 2, (dateValue / 10) % 10, false);
  lcDate.setDigit(0, 1, (dateValue / 100) % 10, false);
  lcDate.setDigit(0, 0, (dateValue / 1000) % 10, false);

  // Display Time (HHMM)
  int timeValue = now.hour() * 100 + now.minute();
  lcTime.setDigit(0, 3, timeValue % 10, false);
  lcTime.setDigit(0, 2, (timeValue / 10) % 10, false);
  lcTime.setDigit(0, 1, (timeValue / 100) % 10, false);
  lcTime.setDigit(0, 0, (timeValue / 1000) % 10, false);
}

void displayYear(int year) {
  // Display Year (YYYY)
  lcYear.setDigit(0, 3, year % 10, false);
  lcYear.setDigit(0, 2, (year / 10) % 10, false);
  lcYear.setDigit(0, 1, (year / 100) % 10, false);
  lcYear.setDigit(0, 0, (year / 1000) % 10, false);
}

void displayTemp(float temp) {
  // Display Temperature with two decimal places
  int tempInt = (int)(temp * 100);
  lcTemp.setDigit(0, 3, tempInt % 10, false);
  lcTemp.setDigit(0, 2, (tempInt / 10) % 10, true);  // Decimal point after the second digit
  lcTemp.setDigit(0, 1, (tempInt / 100) % 10, false);
  lcTemp.setDigit(0, 0, (tempInt / 1000) % 10, false);
}

void displayHumidity(float humidity) {
  // Display Humidity with two decimal places
  int humidityInt = (int)(humidity * 100);
  lcHum.setDigit(0, 3, humidityInt % 10, false);
  lcHum.setDigit(0, 2, (humidityInt / 10) % 10, true);  // Decimal point after the second digit
  lcHum.setDigit(0, 1, (humidityInt / 100) % 10, false);
  lcHum.setDigit(0, 0, (humidityInt / 1000) % 10, false);
}