# ReenterLock.gd
extends Node
class_name PlayerReenterLock

#### 目前无需全局，仅需跟随 ground
#### 因此无需在 exit 时重置锁，也无需推迟计数
#### 因为 PlayerReenterLock 生命周期与 ground 一致

####### PlayerReenterLock 系统提供了以下特性 #############
# 可重入性：每个事件可以多次锁定/解锁，通过计数器管理
# 全局状态追踪：使用静态变量追踪整体锁定状态 [无需启用]
# 生命周期管理：自动处理节点进入/退出场景树的情况 [无需启用]
# 错误保护：防止过度释放，并在出现问题时发出警告
# 调试支持：可选的调试模式输出详细信息
# 便捷方法：提供同时锁定/解锁两种状态的方法
#################################################

signal freeze_changed(count: int, is_add: bool)
signal hold_changed(count: int, is_add: bool)

# 实例级别的锁定请求追踪
var _freeze_requests: int = 0
var _hold_requests: int = 0

# 调试模式
var debug_mode := GlobalConfig.DEBUG


func _exit_tree() -> void:
	if _freeze_requests > 0:
		if debug_mode:
			push_warning(
				"[ReenterLock] Remains %d freeze requests on exit_tree. parent=" % _freeze_requests,
				get_parent()
			)
	if _hold_requests > 0:
		if debug_mode:
			print(
				"[ReenterLock] Remains %d hold requests on exit_tree. parent=" % _hold_requests,
				get_parent()
			)


func _create_timer(duration: float, callable: Callable):
	if duration > 0 and callable:
		get_tree().create_timer(duration).timeout.connect(callable)


# Freeze 相关方法
func freeze(duration := 0.0) -> void:
	if duration > 0:
		_create_timer(duration, release)
	_freeze_requests += 1
	if debug_mode:
		print("[ReenterLock] Freeze applied: ", _freeze_requests)
	freeze_changed.emit(_freeze_requests, true)


func release() -> void:
	if _freeze_requests <= 0:
		push_warning(
			(
				"[ReenterLock] Attempting to release more times than frozen! Current local count: %d"
				% _freeze_requests
			)
		)
		return
	_freeze_requests -= 1
	if debug_mode:
		print("[ReenterLock] Release applied: ", _freeze_requests)
	freeze_changed.emit(_freeze_requests, false)


# Hold 相关方法
func hold(duration := 0.0) -> void:
	if duration > 0:
		_create_timer(duration, unhold)
	_hold_requests += 1
	if debug_mode:
		print("[ReenterLock] Hold applied: ", _hold_requests)
	hold_changed.emit(_hold_requests, true)


func unhold() -> void:
	if _hold_requests <= 0:
		push_warning(
			(
				"[ReenterLock] Attempting to unhold more times than held! Current local count: %d"
				% _hold_requests
			)
		)
		return
	_hold_requests -= 1
	if debug_mode:
		print("[ReenterLock] Unhold applied: ", _hold_requests)
	hold_changed.emit(_hold_requests, false)


# 静态方法：查询当前状态
func is_frozen() -> bool:
	return _freeze_requests > 0


func is_held() -> bool:
	return _hold_requests > 0


func get_freeze_count() -> int:
	return _freeze_requests


func get_hold_count() -> int:
	return _hold_requests


# 便捷方法：同时锁定移动和输入
func lock_all(duration := 0.0) -> void:
	if duration > 0:
		_create_timer(duration, unlock_all)
	_hold_requests += 1
	_freeze_requests += 1
	if debug_mode:
		prints("[ReenterLock] LockAll applied (hold, freeze): ", _hold_requests, _freeze_requests)
	hold_changed.emit(_hold_requests, true)
	freeze_changed.emit(_freeze_requests, true)


func unlock_all() -> void:
	release()
	unhold()


func _to_string() -> String:
	return "[ReenterLock] Freeze: %d, Hold: %d" % [_freeze_requests, _hold_requests]