# Creating a simple Pong game

import turtle


# Creating the game window

window = turtle.Screen()
window.title("A Classic Pong Game!")
window.bgcolor("black")
window.setup(width=800, height=600)
window.tracer(0)


# Scoring Mechanism

score_a = 0
score_b = 0



# Left Paddle

paddle_a = turtle.Turtle()
paddle_a.speed(0)
paddle_a.shape("square")
paddle_a.color("white")
paddle_a.shapesize(stretch_len=1, stretch_wid=5)
paddle_a.penup()
paddle_a.goto(-350,0)


# Right Paddle

paddle_b = turtle.Turtle()
paddle_b.speed(0)
paddle_b.shape("square")
paddle_b.color("white")
paddle_b.shapesize(stretch_len=1, stretch_wid=5)
paddle_b.penup()
paddle_b.goto(350,0)


# The ball

ball = turtle.Turtle()
ball.speed(0)
ball.shape("square")
ball.color("white")
ball.penup()
ball.goto(0,0)
ball.dx = 0.1
ball.dy = 0.1


# Scoring Mechanism

pen = turtle.Turtle()
pen.speed(0)
pen.color("white")
pen.penup()
pen.hideturtle()
pen.goto(0, 260)
pen.write("Player A: 0 Player B : 0", align="center", font=("Courier", 12, "normal"))


# Movement function

def paddle_a_up():
    y = paddle_a.ycor()
    y += 20
    paddle_a.sety(y)

def paddle_a_down():
    y = paddle_a.ycor()
    y -= 20
    paddle_a.sety(y)

def paddle_b_up():
    y = paddle_b.ycor()
    y += 20
    paddle_b.sety(y)

def paddle_b_down():
    y = paddle_b.ycor()
    y -= 20
    paddle_b.sety(y)


# Keyboard Binding

window.listen()

window.onkeypress(paddle_a_up, "w")
window.onkeypress(paddle_a_down, "s")

window.onkeypress(paddle_b_up, "Up")
window.onkeypress(paddle_b_down, "Down")

# Main game loop

while(1):
    window.update()

    
    # Moving ball
    ball.setx(ball.xcor() + ball.dx)
    ball.sety(ball.ycor() + ball.dy)


    # When ball hits border
    if ball.ycor() > 290:
        ball.sety(290)
        ball.dy *= -1
    
    if ball.ycor() < -290:
        ball.sety(-290)
        ball.dy *= -1

    if ball.xcor() > 390:
        ball.goto(0, 0)
        ball.dx *= -1
        score_a += 1
        pen.clear()
        pen.write("Player A: {} Player B : {}".format(score_a, score_b), align="center", font=("Courier", 12, "normal"))


    if ball.xcor() < -390:
        ball.goto(0, 0)
        ball.dx *= -1
        score_b += 1
        pen.clear()
        pen.write("Player A: {} Player B : {}".format(score_a, score_b), align="center", font=("Courier", 12, "normal"))



    # Collision
    if (ball.xcor() > 340 and ball.xcor() < 350) and (ball.ycor() < paddle_b.ycor() + 40 and ball.ycor() > paddle_b.ycor() - 40):
        ball.setx(340)
        ball.dx *= -1

    if (ball.xcor() < -340 and ball.xcor() > -350) and (ball.ycor() < paddle_a.ycor() + 40 and ball.ycor() > paddle_a.ycor() - 40):
        ball.setx(-340)
        ball.dx *= -1
        
