# Tk_Pong_lite.py

# Tk_Pong_lite.py

from Tkinter import *
from random import randint, choice

window=Tk()

ball_rad=50
paddle_y=100

def init():
    global canvas
    canvas=Canvas(window, width=500, height=500, background="green")
    canvas.pack()
    canvas.create_oval(225, 225, 225+ball_rad, 225+ball_rad, fill="blue", tags="ball")
    canvas.create_rectangle(450, 200, 455, 200+paddle_y, fill="red", tags="paddle")
    canvas.create_text(250, 10, tags="score_text", text="Score: 0")

    move_ball()
    canvas.focus_set() # for binding the kb
    canvas.bind("<Key>", key)
    canvas.bind('<Motion>', mouse_paddle_move)

def key(event):
    canvas.destroy()
    init()

def mouse_paddle_move(event):
    mouseY=event.y
    current_coords=canvas.coords("paddle")
    x1=current_coords[0]
    y1=current_coords[1]
    x2=current_coords[2]
    y2=current_coords[3]
    height=(y2-y1)
    canvas.coords("paddle", x1, mouseY-(height/2), x2, mouseY+(height/2))

def move_ball(speed_x=-10, speed_y=7, score=0):
    box=canvas.bbox("ball")
    x1=box[0]
    y1=box[1]
    x2=box[2]
    y2=box[3]

    box=canvas.bbox("paddle")
    px1=box[0]
    py1=box[1]
    px2=box[2]
    py2=box[3]
    b=(y2-ball_rad / 2)
    p=(py2-paddle_y / 2)

    if x2 > px1:
        if y2 > py1 and y1 < py2:
            speed_x=abs(speed_x)*-1
            if speed_x > -54:
                speed_x += -1.2
            speed_y=(b-p) / 2
            score=score+1
            canvas.itemconfig("score_text", text="Score: "+str(score))
        if x2 > 510:
            canvas.create_text(250, 250, text="Game Over!")
            return
    if x1 <= 0:
        speed_x=abs(speed_x)
        speed_y = choice([20,15,10,-10,-15,-20])

    if y2 > 500:
        speed_y=abs(speed_y)*-1
    elif y1 < 0:
        speed_y=abs(speed_y)

    canvas.move("ball", speed_x, speed_y)
    canvas.after(40, move_ball, speed_x, speed_y, score)

init()

mainloop()