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

int Screen_width = 128;
int Screen_ht = 64;
int reset = -1;
int address = 0x3C;
int a = 64,b = 32;
int x = 55,y = 60;
int x_speed = 1,y_speed = 1;
int score = 0;
int k1,k2;

Adafruit_SSD1306 display(Screen_width,Screen_ht,&Wire,reset);

void setup ()
{
  pinMode(16,INPUT_PULLDOWN);
  pinMode(18,INPUT_PULLDOWN);
  pinMode(19,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(18);
  if(k1==1 && (x+20)<=127)
  {
    x+=3.5;
    Serial.println("Right movemennt"); 
  }
  k2=digitalRead(16);
  if(k2==1 && x>=1)
  {
    x-=3.5;
    Serial.println("Left movemennt"); 
  }

  if(2<a<125 && b>0)
  {//mid position
    x_speed = x_speed;
    y_speed = y_speed;
  }
  if(a==125||a==2)
  {//right and left size
    x_speed = -x_speed;
    y_speed = y_speed;
  }
  if(b==2)
  {// Upper Position
    x_speed = x_speed;
    y_speed = -y_speed;
  }
  if(x<=a && a<=x+20 && b+2==59)
  {//When Paddle hits
    x_speed = x_speed;
    y_speed = -y_speed;
    score+=1;
    digitalWrite(19, HIGH);
    delay(20);
    digitalWrite(19, LOW);
  }

  a+=x_speed;
  b+=y_speed;
  display.fillCircle(a,b,2,WHITE);
  display.fillRect(x,y,20,4,WHITE);
  delay(1000);

  display.display();
  display.clearDisplay();

  if(b>=61)
  {
    digitalWrite(19,HIGH);
    delay(1000);
    digitalWrite(19,LOW);
    display.clearDisplay();
    display.setTextSize(1);
    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;
  }
}