#include <LiquidCrystal.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>

LiquidCrystal_I2C lcd(0x27,  16, 2);
int waiting;
int obst1_pos = 16;
int obst2_pos = 24;
int button = 8;
int prev_state;
int player_pos = 1;
int jump_length = 1;
int curr_sprite = 0;

byte player_run1[8] = {
  B00100,
  B01010,
  B00101,
  B01110,
  B10100,
  B00111,
  B00101,
  B01000
};

byte player_run2[8] = {
  B00100,
  B01010,
  B10100,
  B01110,
  B00101,
  B00100,
  B11010,
  B00010
};

byte obstacle1[8] = {
  B10101,
  B01110,
  B01110,
  B11111,
  B01110,
  B01110,
  B11111,
  B01110
};

byte obstacle2[8] = {
  B00010,
  B00000,
  B00100,
  B01110,
  B11110,
  B10111,
  B11011,
  B01110
};

void setup() {
  //initialize lcd screen
  lcd.init();
  // turn on the backlight
  lcd.backlight();
  lcd.createChar(0, player_run1);
  lcd.createChar(1, player_run2); 
  lcd.createChar(2, obstacle1);
  lcd.createChar(3, obstacle2);
  pinMode(8, INPUT_PULLUP);
  prev_state = digitalRead(button);
}

void gameover()
{
  lcd.clear();
  lcd.setCursor(6, 0);
  lcd.print("GAME");
  lcd.setCursor(6, 1);
  lcd.print("OVER");
  delay(2000);
  lcd.clear();
  player_pos = 1;
  obst1_pos = 16;
  obst2_pos = 24;
}

void collision()
{
  if ((obst1_pos == 0 && player_pos == 1) || (obst2_pos == 0 && player_pos == 1))
  {
    gameover();
  }
}

//
void jump()
{
  if (jump_length <= 0)
  {
    player_pos = 1;
  }

  if (!digitalRead(button) && prev_state == HIGH) {
    prev_state = digitalRead(button);
    player_pos = 0;
    jump_length = 1;
  }
}

void moveObstacles()
{
  if (obst1_pos < 0) 
  {
    obst1_pos = 16;
  }
  if (obst2_pos < 0)
  {
    obst2_pos = obst1_pos + 8;
  }

  lcd.setCursor(obst1_pos, 1);
  lcd.write(byte(2));
  lcd.setCursor(obst2_pos, 1);
  lcd.write(byte(3));
  obst1_pos--;
  obst2_pos--;
}

void loop() {
  moveObstacles();
  lcd.setCursor(0, player_pos);
  lcd.write(byte(curr_sprite));
  // wait before changing display
  waiting = millis() + 200;
  while (waiting > millis())
  {
    jump();
  }
  collision();
  // run sprite choice
  switch(curr_sprite) {
    case 1:
      curr_sprite = 0;
      break;
    case 0:
      curr_sprite = 1;
      break;
    default:
      break;
  }
  prev_state = digitalRead(button);
  jump_length--;
  lcd.clear();
}