#include <MD_MAX72xx.h>
#include <ezButton.h>

const byte hpin = A0;
const byte vpin = A1;
const byte cs_pin = 10;
const byte max_dev = 1;

MD_MAX72XX matrix = MD_MAX72XX(MD_MAX72XX::PAROLA_HW, cs_pin, max_dev);
ezButton btn(8);

byte player_x = 0;
byte direction = "";

byte obj_y = 0;
byte obj1_x = 0;
byte obj2_x = 0;
byte obj3_x = 0;

long int current_time, prev_obstacle_move, prev_player_move = 0;
short threshold = 400;
bool game_end = false;

void setup() {
  Serial.begin(9600);

  btn.setDebounceTime(25);
  matrix.begin();
  matrix.clear();

  generate_obstacle();
}

void loop() {
  if (!game_end) {
    current_time = millis();
    check_direction();

    if (current_time - prev_player_move >= 150) {
      prev_player_move = current_time;

      matrix.clear();

      move_sprite();
      matrix.setPoint(7, player_x, true);
      matrix.setPoint(obj_y, obj1_x, true);
      matrix.setPoint(obj_y, obj2_x, true);
      matrix.setPoint(obj_y, obj3_x, true);
    }

    if (current_time - prev_obstacle_move >= threshold) {
      prev_obstacle_move = current_time;
      obj_y++;
      if (obj_y > 7) {
        generate_obstacle();
        threshold -= 10;
        if (threshold < 150) threshold = 150;
      }
    }

    if (obj_y == 7 && (player_x == obj1_x || player_x == obj2_x || player_x == obj3_x)) {
      game_end = true;
    }
  }

  else if (game_end) {
    show_msg("GAME OVER");
    while (1) {
      btn.loop();
      if (btn.isPressed()) {
        game_end = false;
        obj_y = 8;
        player_x = 0;
        threshold = 400;
        break;
      }
    }
  }
}

void check_direction() {
  if (analogRead(hpin) > 512) direction = 1;
  else if (analogRead(hpin) < 512) direction = -1;
  else direction = 0;
}

void move_sprite() {
  player_x += direction;
  constrain(player_x, 0, 7);
}

void generate_obstacle() {
  obj_y = 0;
  while (true) {
    obj1_x = random(0, 8);
    obj2_x = random(0, 8);
    obj3_x = random(0, 8);
    if (obj1_x != obj2_x && obj2_x != obj3_x && obj3_x != obj1_x) break;
  }
}

void show_msg (char msg[]) {
  for (byte i = 0; i < 6; i++) {
    for (byte x = 0; x < 8; x++) {
      for (byte y = 0; y < 8; y++) {
        matrix.setPoint(y, x, (i % 2 == 0));
      }
    }
    delay(500);
  }

  for (byte i = 0; msg[i] != '\0'; i++) {
    matrix.setChar(6, msg[i]);
    delay(500);
    matrix.clear();
    delay(500);
  }
}