@tool
extends PanelContainer

@onready var spawn_slot_root: VBoxContainer = %SpawnSlotRoot
@onready var add_button: Button = %AddButton
@onready var remove_button: Button = %RemoveButton

var _inited: bool = false
var _max_length: int = -1

## 默认的Slot
const SLOT: PackedScene = preload("res://addons/reedscene/act/StateDrapSlot.tscn")

func _ready() -> void:
	if not Engine.is_editor_hint():
		return

	# 连接按钮
	add_button.pressed.connect(_on_add_pressed)
	remove_button.pressed.connect(_on_remove_pressed)

	# 初始保证至少有一个 Slot
	if spawn_slot_root.get_child_count() == 0:
		_add_slot()

	_update_remove_button_state()

func init(info:Dictionary) -> void:
	_inited = true
	if info.has("size"):
		self._max_length = info.get("size") as int

func _on_add_pressed() -> void:
	_add_slot()

func _on_remove_pressed() -> void:
	_remove_slot()

func _add_slot() -> void:
	if spawn_slot_root.get_child_count() >= _max_length:
		return
	
	var slot := SLOT.instantiate()
	spawn_slot_root.add_child(slot)
	slot.owner = get_tree().edited_scene_root # 编辑器可保存
	slot.init(spawn_slot_root.get_children().size())

	_update_remove_button_state()

func _remove_slot() -> void:
	var count := spawn_slot_root.get_child_count()
	if count <= 1:
		return

	var last := spawn_slot_root.get_child(count - 1)
	last.queue_free()

	_update_remove_button_state()

func _update_remove_button_state() -> void:
	remove_button.disabled = spawn_slot_root.get_child_count() <= 1