#include <MD_MAX72xx.h>

#define JOYSTICK_VERT_PIN A0
#define JOYSTICK_HORZ_PIN A1
#define JOYSTICK_SEL_PIN  2
#define LED_MATRIX_CS_PIN 10
#define	LED_MATRIX_MAX_DEVICES	1
#define LED_MATRIX_ROW    7
#define LED_MATRIX_COLUMN 7
#define DEFAULT_POS_X   4
#define DEFAULT_POS_y   4

struct stPos {
  uint8_t x;
  uint8_t y;
};

void callbackSel();

MD_MAX72XX mx = MD_MAX72XX(MD_MAX72XX::PAROLA_HW, LED_MATRIX_CS_PIN, LED_MATRIX_MAX_DEVICES);
volatile stPos pos = {.x = DEFAULT_POS_X, .y = DEFAULT_POS_y};

void setup() {
  pinMode(JOYSTICK_VERT_PIN, INPUT);
  pinMode(JOYSTICK_HORZ_PIN, INPUT);
  pinMode(JOYSTICK_SEL_PIN, INPUT_PULLUP);

  attachInterrupt(digitalPinToInterrupt(JOYSTICK_SEL_PIN), callbackSel, FALLING);

  mx.begin();
  mx.control(MD_MAX72XX::INTENSITY, MAX_INTENSITY / 2);
  mx.clear();
}

void loop() {
  uint16_t horz = analogRead(JOYSTICK_HORZ_PIN);
  uint16_t vert = analogRead(JOYSTICK_VERT_PIN);
  if (vert < 300) {
    pos.y = min(pos.y + 1, LED_MATRIX_COLUMN);
  }
  if (vert > 700) {
    pos.y = max(pos.y - 1, 0);
  }
  if (horz > 700) {
    pos.x = min(pos.x + 1, LED_MATRIX_ROW);
  }
  if (horz < 300) {
    pos.x = max(pos.x - 1, 0);
  }
  mx.setPoint(pos.y, pos.x, true);
  mx.update();
  delay(200);
}

void callbackSel() {
  mx.clear();
  pos.x = DEFAULT_POS_X;
  pos.y = DEFAULT_POS_y;
}