extends Node2D

# attributs du script courant
# variables de travail
var screen_size
var pad_size
var direction = Vector2(1.0, 0.0)

# Vitesse initiale de la balle(en pixels/seconde)
const INITIAL_BALL_SPEED = 80

# Vitesse de la balle (en pixels/seconde)
var ball_speed = INITIAL_BALL_SPEED

# Vitesse des raquettes
const PAD_SPEED = 150

func _ready():
	# initialisation des attributs
	self.pad_size = get_node("left").get_texture().get_size()
	self.screen_size = get_viewport_rect().size
	
	# Activer les traitements pour chaque frame sur temps libre
	set_process(true)

func _process(delta):
	# position courante de la balle
	var ball_position = get_node("ball").get_pos()
	
	# Construit une aire occupée par la raquette gauche
	# pour la detection de collision
	var left_rect = Rect2(get_node("left").get_pos() - self.pad_size * 0.5, self.pad_size)
	var right_rect = Rect2(get_node("right").get_pos() - self.pad_size * 0.5, self.pad_size)
	
	# Calcul de la nouvelle position
	ball_position += self.direction * self.ball_speed * delta
	
	# La balle change de direction lorsqu'elle touche les bords haut et bas
	if ((ball_position.y < 0 and self.direction.y < 0) or (ball_position.y > self.screen_size.y and self.direction.y > 0)):
		self.direction.y = -self.direction.y
	
	# Change la direction et augmente la vitesse lorsque la balle touche les raquettes
	if ((left_rect.has_point(ball_position) and self.direction.x < 0) or (right_rect.has_point(ball_position) and self.direction.x > 0)):
    self.direction.x = -self.direction.x
    self.direction.y = randf()*2.0 - 1
    self.direction = self.direction.normalized()
    self.ball_speed *= 1.1

# Si la balle sort, elle est replacée au centre avec vitesse et position initiale
	if (ball_position.x < 0 or ball_position.x > self.screen_size.x):
		ball_position = self.screen_size*0.5
		self.ball_speed = self.INITIAL_BALL_SPEED
		self.direction = Vector2(1.0, 0.0)

	# Mise a jour de la position de la balle
	get_node("ball").set_pos(ball_position)
	
	# Bouger la raquette gauche
	var left_pos = get_node("left").get_pos()

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

	get_node("left").set_pos(left_pos)

	# Bouger la raquette droite
	var right_pos = get_node("right").get_pos()

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

	get_node("right").set_pos(right_pos)