#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include<Adafruit_GFX.h>

int screen_width = 128;
int screen_height = 64;
int reset = -1 ;
int address = 0x3C;
int leftbutton = 16;
int rightbutton = 18;
int led = 19;
int a = 64; 
int b = 32;
int x = 55; 
int y = 60; 
int x_speed = 1, y_speed = 1; 
int score = 0;
int k1, k2;

Adafruit_SSD1306 display(screen_width, screen_height, &Wire, reset);

void setup(){
  pinMode(leftbutton, INPUT_PULLDOWN);
  pinMode(rightbutton, INPUT_PULLDOWN);
  pinMode(led, OUTPUT);
  Serial.begin(9600);
  if (!display.begin(SSD1306_SWITCHCAPVCC,address)){
    Serial.println("display not connected");
    for(;;);
  }
  display.clearDisplay();
}

void loop(){
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(115, 1);
  display.print(score);

  k1=digitalRead(16);
  if(k1 == 1 && x >= 3.5){
    x = x - 3.5;
    Serial.println("Left");
  } 

  k2=digitalRead(18);
  if(k2 == 1 && x + 20 <= 127){
    x = x + 3.5;
    Serial.println("Right");
  }
 
  if(2 < a < 125 && 0 < b){
    x_speed = x_speed;
    y_speed = y_speed;
  }
  if(a == 125 || a == 2){ 
    x_speed = -x_speed;
    y_speed = y_speed;
  }
  if(b ==2 ){ 
    x_speed = x_speed;
    y_speed = -y_speed;
  }
  if(x <= a && a <= x+20 && b+2 == 59){ 
    x_speed = x_speed;
    y_speed = -y_speed;
    score = score + 1;
    digitalWrite(led, HIGH);
    delay(20);
    digitalWrite(led, LOW);
  }

  a = a + x_speed;
  b = b + y_speed;

  display.fillCircle(a, b, 2, WHITE);
  display.fillRect(x, y, 20, 4, WHITE);
  display.display();
  display.clearDisplay();

  if(b>=61){ 
    digitalWrite(led, HIGH);
    delay(1000);
    digitalWrite(led, LOW);

    display.clearDisplay();
    display.setTextSize(2);
    display.setTextColor(WHITE);
    display.setCursor(25, 25);

    display.print("Score ");
    display.print(score);
    display.display();
    delay(2000); 
    display.clearDisplay();

    a=64;
    b=32;
    score=0;
    x=55;
    y=60;

  }
}