extends Node2D

#Member variables
var screen_size
var pad_size
var direction = Vector2(1.0, 0.0)

const INITIAL_BALL_SPEED = 80
var ball_speed = INITIAL_BALL_SPEED
const PAD_SPEED = 150

func _ready():
	set_process(true)
	screen_size = get_viewport_rect().size
	pad_size = get_node("left").get_texture().get_size()

func _process(delta):
	var ball_pos = get_node("ball").get_pos()
	var left_rect = Rect2( get_node("left").get_pos() - pad_size*0.5, pad_size )
	var right_rect = Rect2( get_node("right").get_pos() - pad_size*0.5, pad_size )
	ball_pos += direction * ball_speed * delta
#Flip when touching roof or floor
	if ((ball_pos.y < 0 and direction.y < 0) or (ball_pos.y > screen_size.y and direction.y > 0)):
    direction.y = -direction.y
# Flip, change direction and increase speed when touching pads
	if ((left_rect.has_point(ball_pos) and direction.x < 0) or (right_rect.has_point(ball_pos) and direction.x > 0)):
    direction.x = -direction.x
    direction.y = randf()*2.0 - 1
    direction = direction.normalized()
    ball_speed *= 1.1
# Check gameover
	if (ball_pos.x < 0 or ball_pos.x > screen_size.x):
    ball_pos = screen_size*0.5
    ball_speed = INITIAL_BALL_SPEED
    direction = Vector2(-1, 0)

	get_node("ball").set_pos(ball_pos)

# Move left pad
	var left_pos = get_node("left").get_pos()

	if (left_pos.y > 0 and Input.is_action_pressed("left_move_up")):
    left_pos.y += -PAD_SPEED * delta
	if (left_pos.y < screen_size.y and Input.is_action_pressed("left_move_down")):
    left_pos.y += PAD_SPEED * delta

	get_node("left").set_pos(left_pos)

# Move right pad
	var right_pos = get_node("right").get_pos()

	if (right_pos.y > 0 and Input.is_action_pressed("right_move_up")):
    right_pos.y += -PAD_SPEED * delta
	if (right_pos.y < screen_size.y and Input.is_action_pressed("right_move_down")):
    right_pos.y += PAD_SPEED * delta

	get_node("right").set_pos(right_pos)