class_name ClimbComponent extends ComponentBase

var characterbody: CharacterBody2D

@export var climb_max_stamina: float
@export var climb_max_speed_upward: float = 45.0
@export var climb_max_speed_downward: float = 80.0
@export var climb_acceleration: float = 900.0


var _climb_input: float
var _can_climb: bool = false

func _init_component()-> void:
	characterbody = component_owner as CharacterBody2D
	assert(characterbody,"组件没有正确的绑定CharacterBody2D")


func _physics_process(delta: float) -> void:
	if not _can_climb: return
	
	print("攀爬更新中")
	_update_climb(delta)
	characterbody.move_and_slide() #移动更新

func _update_climb(delta) -> void:
	
	var target_abs: float
	
	#更新目标速度
	if sign(_climb_input) == .0:
		target_abs = 0
	elif sign(_climb_input) > 0:
		target_abs = climb_max_speed_downward
	else:
		target_abs = climb_max_speed_upward
	
	var target = target_abs * _climb_input
	characterbody.velocity.y = speed_approach(characterbody.velocity.y,target,climb_acceleration * delta)

func add_climb_input(input: float) -> bool:
	_climb_input = input
	return true

func start_climb(force_reset: bool = false) -> void:
	if force_reset:
		characterbody.velocity = Vector2.ZERO
		characterbody.move_and_slide()
	
	_can_climb = true

func suspend_climb() -> void:
	_can_climb = false

#region Helper Function
func speed_approach(current: float, target: float, delta: float) -> float:
	if current < target:
		return min(current + delta, target)
	elif current > target:
		return max(current - delta, target)
	return target

func velocity_approach(current: Vector2, target: Vector2, delta: float) -> Vector2:
	var result = current
	result.x = speed_approach(current.x, target.x, delta)
	result.y = speed_approach(current.y, target.y, delta)
	return result
#endregion