#include <MD_MAX72xx.h>
#include <SPI.h>

#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW
#define MAX_DEVICES 1 
#define CS_PIN 10
#define DATA_PIN 11
#define CLK_PIN 13

MD_MAX72XX matrix = MD_MAX72XX(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);

#define ENC_A 5       // CLK
#define ENC_B 6       // DT
#define ENC_BTN 7     // SW

int x = 0;
int y = 0;
int axis = 0;

int lastEncA = HIGH;
int lastEncBtn = HIGH; 

unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;

void setup() {
  matrix.begin();
  matrix.clear();
  
  pinMode(ENC_A, INPUT_PULLUP);
  pinMode(ENC_B, INPUT_PULLUP);
  pinMode(ENC_BTN, INPUT_PULLUP);

  lastEncA = digitalRead(ENC_A);
  lastEncBtn = digitalRead(ENC_BTN);
}

void loop() {
  int encA = digitalRead(ENC_A);
  int encB = digitalRead(ENC_B);

  if (encA != lastEncA) {
    if (encB != lastEncA) {
      movePixel(1);
    } else {
      movePixel(-1);
    }
    lastEncA = encA;
  }

  int encBtn = digitalRead(ENC_BTN);
  if (encBtn != lastEncBtn) {
    if (encBtn == LOW) {
      if (millis() - lastDebounceTime > debounceDelay) {
        toggleAxis();
        lastDebounceTime = millis();
      }
    }
    lastEncBtn = encBtn;
  }

  matrix.clear();
  matrix.setPoint(y, x, true);
  
  delay(10);
}

void movePixel(int direction) {
  if (axis == 0) { 
    if (direction > 0 && x < 7) {
      x++;
    } else if (direction < 0 && x > 0) {
      x--;
    }
  } else {    
    if (direction > 0 && y < 7) {
      y++;
    } else if (direction < 0 && y > 0) {
      y--;
    }
  }
}

void toggleAxis() {
  axis = (axis + 1) % 2;
}