extends Node

# 统一处理 UI 的 Esc 退出。可关闭界面加入 whaletown_escape_dismissible 分组，
# 并实现 is_escape_dismissible / get_escape_priority / request_escape_close。
const ESCAPE_DISMISSIBLE_GROUP: StringName = &"whaletown_escape_dismissible"

func _ready() -> void:
	# 公告、排行榜等界面会暂停场景树，Esc 仍必须有效。
	process_mode = Node.PROCESS_MODE_ALWAYS

func _input(event: InputEvent) -> void:
	if not (event is InputEventKey):
		return
	var key_event: InputEventKey = event as InputEventKey
	if not key_event.pressed or key_event.echo or key_event.keycode != KEY_ESCAPE:
		return
	if _hide_open_popup_menu() or _close_topmost_dismissible() or _release_control_focus():
		get_viewport().set_input_as_handled()

func _hide_open_popup_menu() -> bool:
	var popup_nodes: Array[Node] = get_tree().root.find_children("*", "PopupMenu", true, false)
	for popup_node: Node in popup_nodes:
		var popup: PopupMenu = popup_node as PopupMenu
		if popup != null and popup.visible:
			popup.hide()
			return true
	return false

func _close_topmost_dismissible() -> bool:
	var target: Node = null
	var target_priority: int = -2147483648
	var dismissibles: Array[Node] = get_tree().get_nodes_in_group(ESCAPE_DISMISSIBLE_GROUP)
	for dismissible: Node in dismissibles:
		if not is_instance_valid(dismissible):
			continue
		if not dismissible.has_method("is_escape_dismissible") or not dismissible.has_method("request_escape_close"):
			continue
		var is_dismissible_variant: Variant = dismissible.call("is_escape_dismissible")
		if not bool(is_dismissible_variant):
			continue
		var priority: int = 0
		if dismissible.has_method("get_escape_priority"):
			var priority_variant: Variant = dismissible.call("get_escape_priority")
			priority = int(priority_variant)
		if target == null or priority > target_priority:
			target = dismissible
			target_priority = priority
	if target == null:
		return false
	target.call("request_escape_close")
	return true

func _release_control_focus() -> bool:
	var focus_owner: Control = get_viewport().gui_get_focus_owner()
	if focus_owner == null:
		return false
	focus_owner.release_focus()
	return true