#include <LiquidCrystal_I2C.h>


LiquidCrystal_I2C lcd(0x27, 20, 4);

const int BUTTON_L = 2; //Кнопка "Влево"
const int BUTTON_R = 3; //Кнопка "Вправо"
const int BUTTON_U = 4; //Кнопка "Вверх"
const int BUTTON_D = 5;//Кнопка "Вниз"

const char PLAYER = 1; //Игрок
byte player_image[8] = {
	0b00000,
	0b00000,
	0b00000,
	0b00000,
	0b01110,
	0b01010,
	0b01110,
	0b00000
};




const char SPACE = ' '; //Пространство
const char WALL = 0xff; //Стена
const char HP = 'H'; //Здоровье

const char MONSTER_1 = 3;
byte monster_1_image[8] = {
	0b00000,
	0b00000,
	0b01010,
	0b00000,
	0b01110,
	0b10001,
	0b00000,
	0b00000
};

//Размер игровой карты.
const int MAP_W = 20; //Ширина
const int MAP_H = 4; //Высота

//Игровая карта.
char game_map [MAP_H][MAP_W];

int player_x = 0;
int player_y = 0;

void map_show(int px, int py){
  for (int y = 0; y < MAP_H; y++) {
    for (int x = 0; x < MAP_W; x++) {
      lcd.setCursor(x, y);
      if ((y == py) && (x == px)) {
        lcd.print (PLAYER);
      } else {
      lcd.print (game_map [y][x] );
    }
  }
 }
}

void map_generate(){
  for (int y= 0; y < MAP_H; y++) {
    for (int x= 0; x < MAP_W; x++) {
      game_map [y][x] = SPACE;
  }
}
game_map[0][5] = WALL;
game_map[1][5] = WALL;
game_map[2][5] = WALL;
game_map[2][4] = WALL;
game_map[1][2] = HP;
game_map[1][0] = MONSTER_1;
}

//Функция для проверки, находится ли на позиции x, y стена.
bool is_wall(int x, int y){
  return game_map [y][x] == WALL;
}

bool is_hp(int x, int y){
  return game_map[y][x] == HP;
}

void map_set(int x, int y, char object) {
  game_map[y][x] = object;
}

void setup() {
  lcd.init();
  lcd.backlight(); //подсветка
  pinMode(BUTTON_L, INPUT_PULLUP);
  pinMode(BUTTON_R, INPUT_PULLUP);
  pinMode(BUTTON_U, INPUT_PULLUP);
  pinMode(BUTTON_D, INPUT_PULLUP);
  //Serial.begin(9600);
  lcd.createChar(PLAYER, player_image);
  lcd.createChar(MONSTER_1, monster_1_image);
  map_generate();
}

void loop() {
  map_show(player_x, player_y);

  //Это уже не надо:
  //lcd.setCursor(player_x, player_y)
  //lcd.print(PLAYER);

  if (digitalRead(BUTTON_R) == LOW) {
    if ((player_x < MAP_W - 1) && (! is_wall(player_x + 1, player_y)) ){
    player_x++;
    }
  }

   if (digitalRead(BUTTON_L) == LOW) {
     if ((player_x < MAP_W - 1) && (! is_wall(player_x - 1, player_y)) ){
    player_x--;
     }
  }

  if (digitalRead(BUTTON_U) == LOW)   {
     if ((player_y > 0) && (! is_wall(player_x , player_y - 1))) {
    player_y--;
     }
  }

     if (digitalRead(BUTTON_D) == LOW)  {
     if ((player_y < MAP_H - 1) && (! is_wall(player_x , player_y + 1)))  {
    player_y++;
     }
     }
}