class_name Balle
extends CharacterBody2D


const ratio_diff_angle: float = PI * 0.005 # radian / px
const ascension_min: float = 10.0 # px / sec

@export var mouvement_initial: Vector2 = Vector2(0.0, 600.0)

var _mouvement: Vector2


func _ready() -> void:
	_mouvement = mouvement_initial


func _physics_process(delta: float) -> void:
	var impact: KinematicCollision2D = move_and_collide(_mouvement * delta)
	if impact != null:
		_rebondir(impact)
		var obstacle: Object = impact.get_collider()
		if obstacle is Raquette:
			_orienter_tir(obstacle)


func _rebondir(impact: KinematicCollision2D) -> void:
	_mouvement = _mouvement.bounce(impact.get_normal())


func _orienter_tir(raquette: Raquette) -> void:
	var difference = position.x - raquette.position.x
	_mouvement = Vector2.UP.rotated(difference * ratio_diff_angle) * _mouvement.length()
	
	# empeche la balle de traverser la raquette
	if _mouvement.y > 0:
		_mouvement.y = ascension_min