#include <Wire.h>
#include <RTClib.h>
#include <Adafruit_NeoPixel.h>
#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>

RTC_DS1307 rtc; // Utwórz obiekt RTC

#define MATRIX_PIN 2
#define MATRIX_WIDTH 10
#define MATRIX_HEIGHT 10
Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(MATRIX_WIDTH, MATRIX_HEIGHT, MATRIX_PIN,
                            NEO_MATRIX_TOP + NEO_MATRIX_LEFT +
                            NEO_MATRIX_ROWS,
                            NEO_GRB + NEO_KHZ800);

void setup() {
  //Serial.begin(115200);
  //Serial.println("RTC demo!");
  Wire.begin();
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }
 
  matrix.begin();
  matrix.setTextWrap(false);
  matrix.setBrightness(250);
  matrix.setRotation(2);
}

void loop() {
  DateTime now = rtc.now();
  int currentDay = now.day();
  String dayStr = String(currentDay);

  // Calculate the color based on the day of the month
  int r = 255 - ((currentDay - 1) * 255 / 30); // Red decreases
  int g = (currentDay - 1) * 255 / 30; // Green increases
  int color = matrix.Color(r, g, 0);

  // Display the day number on the LED matrix with the calculated color
  matrix.fillScreen(0); // Clear screen
  matrix.setTextSize(1); // Set text size to fit within 10x10 matrix
  matrix.setTextColor(color);

  if (dayStr.length() < 2) {
    matrix.setCursor((matrix.width() - 6) / 2, (matrix.height() - 8) / 2);
  } else {
    matrix.setCursor((matrix.width() - 12) / 2, (matrix.height() - 8) / 2);
  }
 
  matrix.print(dayStr);
  matrix.show();
  delay(1000);
}