TouhouGD/script/character/hitbox.gd

extends Area3D
class_name Hitbox

@export var pushbox_curve: Curve

@onready var character: Character = (get_owner() as Character)

var radius: float
var pushbox_list: Array[Variant] = []


func _ready():
	var collisionShape3D: CollisionShape3D = $CollisionShape3D as CollisionShape3D
	var shape: CylinderShape3D = collisionShape3D.shape as CylinderShape3D
	radius = shape.radius * scale.x


func _process(delta) -> void:
	var speed_dir: Vector2 = character.get_status("speed_dir") as Vector2
	if speed_dir.length() == 0:
		return
	var speed_down_push_rate: int = 0
	var pos: Vector2              = character.pos2D()
	for pushbox: Hitbox in pushbox_list:
		var target_pos: Vector2 = pushbox.character.pos2D()
		var dir: Vector2        = target_pos - pos
		if speed_dir.dot(dir) <= 0:
			continue
		var dist: float = dir.length()
		if dist == 0:
			continue
		var dist_rate = clamp(dist/(radius+pushbox.radius), 0, 1)
		speed_down_push_rate = max(speed_down_push_rate, pushbox_curve.sample(dist_rate))
	character.set_status("speed_down_push_rate", speed_down_push_rate)
	return


func on_area_entered(area: Area3D):
	if area is Hitbox:
		pushbox_list.append(area)


func on_area_exited(area: Area3D):
	if area is Hitbox:
		pushbox_list.erase(area)