#include <LiquidCrystal.h>

const int rs = PA8, en = PB1, d4 = PB6, d5 = PB7, d6 = PB0, d7 = PA12;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

const int toggle_lane = PB5;
int player_row = 0;
int opponent_row = 0;
int score = 0;
int column = 15;

void setup() {
   pinMode(toggle_lane, INPUT);
   lcd.begin(16, 2);
   lcd.print("--ASCII--RACER--");
   lcd.setCursor(0, 1);
   lcd.print("----------------");
   delay(3000);
   lcd.clear();
}

void loop() {
  if (column < 0){
    column = 15;
  }
  opponent_row = random(0, 2);
  for (int i = 15; i>=0; i--){ 
    if (digitalRead(toggle_lane) == HIGH){ 
      delay(40);
      if (player_row == 0){
        player_row = 1;
      } 
      else if (player_row == 1){
        player_row = 0;
      }
    }      
    lcd.clear();
    lcd.setCursor(0, player_row);
    lcd.print("-=}-");

    lcd.setCursor(i,opponent_row);
    lcd.print("O");

    if( (player_row != opponent_row) && (i==1))
      score++;

    if( (player_row == opponent_row) && (i==3))
    { lcd.clear();          lcd.print("  Game over  ");
      lcd.setCursor(0, 1);  lcd.print("Score = ");   lcd.print(10*score);
      delay(4000);
      score = 0;
      column = 15;
      }

    delay(300);
    column --;
  }
}