godot-plateformer/_props/dark_material_ball/dark_material_ball.gd

extends CharacterBody2D

@onready var player_collectable_volumn: PlayerTriggerVolumn = %PlayerCollectableVolumn
@onready var hook_attract_volumn: Area2D = %HookAttractVolumn

enum State {
	IDLE,
	PULLED_BY_HOOK,
	COLLECTED
}

var _current_state: State = State.IDLE

## 拉回速度
@export var pull_speed: float = 800.0
## 拉回目标（玩家）
var _pull_target: Node2D

func _ready() -> void:
	player_collectable_volumn.player_entered.connect(_on_player_collected)

##状态管理函数
func change_state(in_state: State) -> void:
	if in_state == _current_state:
		return

	## 退出State的逻辑
	match _current_state:
		State.IDLE:
			pass
		State.PULLED_BY_HOOK:
			pass
		State.COLLECTED:
			pass

	_current_state = in_state

	## 进入State的逻辑
	match in_state:
		State.IDLE:
			pass
		State.PULLED_BY_HOOK:
			pass
		State.COLLECTED:
			queue_free()

## 钩爪击中时调用（hit_pos 是击中点，hook 是钩爪实例）
func on_hook_hit(hit_pos: Vector2, hook: Hook) -> void:
	# 通过钩爪组件获取发射者（玩家）
	_pull_target = hook._binded_hook_comp.owner as Node2D
	if _pull_target:
		change_state(State.PULLED_BY_HOOK)

func _physics_process(delta: float) -> void:
	if _current_state == State.PULLED_BY_HOOK and _pull_target:
		var direction := (_pull_target.global_position - global_position).normalized()
		velocity = direction * pull_speed
		move_and_slide()

func get_attraction_force(pos: Vector2) -> Vector2:
	# 返回 (direction, strength) 格式
	var dir := (global_position - pos).normalized()
	var strength := 1500  # 调整这个值控制吸引力转向速度
	return dir * strength

##如果玩家进入收集区域，则切换为已收集状态。
func _on_player_collected(body:CharacterBody2D) -> void:
	if body is Player:
		body.hsm.dispatch(&"trigger_external_dash")
	change_state(State.COLLECTED)