#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 x11 = 64; int y11=32; // position coordite for center of the ball
int x = 55; int y = 60; // top left corner coordinates of  the particle
int x_speed = 1; int y_speed = 1; //speed of the ball
int score=0;
int k1,k2;


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

void setup()
{
  Serial.begin(9600);
  pinMode(16, INPUT_PULLDOWN);
  pinMode(18, INPUT_PULLDOWN);
  pinMode(19, OUTPUT);
  if(!display.begin(SSD1306_SWITCHCAPVCC,address))
  {
    Serial.println("Display not connected");
    for(;;);
  }
  display.clearDisplay();
}

void loop()
{  
  //Current score display on screen
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(115,1);
  display.print(score);
   //code for movement of paddle
  k1=digitalRead(18);
  if(k1==1 && x+20<=127)
  {
    x=x+3.5;
    Serial.println("Right");
  }
  k2=digitalRead(16);
  if(k2==1 && x>=1)
  {
    x=x-3.5;
    Serial.println("Left");
  }
  //boundary conditions
  if(2<x11<125 && 0<y11)
  {
    x_speed=x_speed;
    y_speed=y_speed;
  }

  if(x11==125||x11==2) //left and right edges
  {
    x_speed=-x_speed;
    y_speed=y_speed;
  }
  if(y11==2) //top edges
  {
    x_speed=x_speed;
    y_speed=-y_speed;
  }
  if(x<=x11 && x11<=x+20 && y11+2==59)
  {
    x_speed=x_speed;
    y_speed=-y_speed;
    score = score + 1;
    digitalWrite(19,HIGH);
    delay(20);
    digitalWrite(19,LOW);
  }
  x11=x11+x_speed;
  y11=y11+y_speed;
  display.fillCircle(x11, y11, 2, WHITE);
  display.fillRect(x, y, 20, 4, WHITE);
  display.display();
  display.clearDisplay();
  
  if(y11>=61)
  {
    digitalWrite(19, HIGH);
    delay(1000);
    digitalWrite(19, LOW);
    display.clearDisplay();
    display.setTextSize(2);
    display.setTextColor(WHITE);
    display.setCursor(25,25);
    display.print("SCORE:");
    display.print(score);
    if(k1==1||k2==1)
    {
      display.clearDisplay();
    x11=64;
    y11=32;
    score=0;
    x=55;
    y=60;
    }
  }
}