#include <LiquidCrystal.h>

LiquidCrystal lcd(4, 6, 10, 11, 12, 13);

class Car
  {
    public :int posx;
    public :int posy;
    public :int mofspeed = 25000;
    public :bool canuse;
    public :bool canmove;

float timer;

public :void MakeCar()
{
            lcd.setCursor(posx, posy);
          lcd.write("B");
  }

  public :void StartCar()
  {
          canmove = true;
           lcd.setCursor(posx, posy);
          lcd.write("B");
    }

    public :void StopCar()
    {
      canmove = false;
       lcd.setCursor(posx, posy);
          lcd.write(" ");
      }

    public :void Move()
    {
      timer++;
      if (timer >= mofspeed)
      {
          lcd.setCursor(posx, posy);
          lcd.write(" ");
          posx--;
          lcd.setCursor(posx, posy);
          lcd.write("B");
          timer = 0;
        }
      }
    };

int LEFTBUTTON = 2;
int RIGHTBUTTON = 3;

int score = 0;
int pos = 2;

bool currentButton = false;
bool currentButton2 = false;

float timer = 0;
float timermax = 150000;
int previusYpos;
float olddeltatime;
Car cars[8];
int carcount;
int movementspeed = 25000;

bool game;
void setup()
{
  // put your setup code here, to run once:
    Serial.begin(9600);
    lcd.begin(20, 4);

    pinMode(LEFTBUTTON, INPUT);
    pinMode(RIGHTBUTTON, INPUT);

    lcd.setCursor(2, pos);
    lcd.write("@");
    timer = timermax;
    game = true;
}

bool GetButton(int button)
{
  return (digitalRead(button));
  }

void MakeCar(int ypos)
{
  cars[carcount].posx= 18;
  cars[carcount].posy = ypos;
   cars[carcount].canuse = false;
      cars[carcount].canmove = true;
  cars[carcount].MakeCar();
  carcount++;
}

void MakeCar(int ypos, int count)
{
  cars[count].posx= 18;
  cars[count].posy = ypos;
  cars[count].canuse = false;
   cars[count].StartCar();
}

void loop()
{
  if (game == true)
  {
    //movement
     if (GetButton(LEFTBUTTON) != currentButton)
     {
     if (GetButton(LEFTBUTTON) == LOW)
     {
          lcd.setCursor(2, pos);
          lcd.write(" ");
          pos++;
          if (pos >= 4)
          {
            pos = 4;
            }
             lcd.setCursor(2, pos);
          lcd.write("@");
      }
     }

     if (GetButton(RIGHTBUTTON) != currentButton2)
     {
     if (GetButton(RIGHTBUTTON) == LOW)
     {
        lcd.setCursor(2, pos);
        lcd.write(" ");
        pos--;
        if (pos <= 0)
        {
        pos = 0;
        }
        lcd.setCursor(2, pos);
          lcd.write("@");
      }
     }

    currentButton = GetButton(LEFTBUTTON);
    currentButton2 = GetButton(RIGHTBUTTON);

    //car
    timer ++;
    if (timer >= timermax)
    {
      if (carcount >= 8)
      {
        for (int i = 0; i < carcount; i++)
        {
          if (cars[i].canuse == true)
          {
                MakeCar(random(0, 4), i);
                break;
          }
        }
      }
      else
      {
          MakeCar(random(0, 4));
      }
      if (timermax - 1000 > 100)
      {
          timermax -= 1000;
      }

      if (movementspeed - 1000 > 100)
      {
        movementspeed -= 1000;
      }
      timer = 0;
    }

    for (int i = 0; i < carcount; i++)
    {
          //check collision
          if (cars[i].posx == 2 && cars[i].posy == pos)
          {
            game = false;
            }

      if (cars[i].canuse == false) {
        if (cars[i].canmove == true)
        {
          cars[i].Move();
        }
        cars[i].mofspeed = movementspeed;
        if (cars[i].posx <= 0)
        {
          cars[i].canuse = true;
          cars[i].StopCar();
        }
      }
    }
}
else
{
  lcd.clear();
  lcd.setCursor(5, 2);
  lcd.write("game over!");
  }
}