extends Node
class_name StateSlide

var machine: MovementStateMachine
var params: MovementParams:
	get: return machine.params

var elapsed: float = 0.0


func enter(_data: Dictionary = {}) -> void:
	elapsed = 0.0
	machine.register_chain_mechanic("slide")
	# Lower player capsule
	var player_node = machine.player
	var shape: CapsuleShape3D = machine.player.shape_owner_get_shape(0, 0)
	if shape:
		shape.height = shape.height * 0.5


func exit() -> void:
	pass


func update(delta: float) -> void:
	elapsed += delta
	var vel: Vector3 = machine.player.velocity
	var forward: Vector3 = -machine.player.global_transform.basis.z
	if forward.length_squared() > 1.0:
		forward = forward.normalized()
	vel.x = forward.x * params.slide_speed * machine.get_effective_speed(1.0)
	vel.z = forward.z * params.slide_speed * machine.get_effective_speed(1.0)
	vel.x *= pow(params.slide_friction, delta)
	vel.z *= pow(params.slide_friction, delta)
	machine.player.velocity = vel
	machine.player.move_and_slide()

	if machine.player.is_on_floor():
		machine.on_ground = true
		var speed := Vector3(vel.x, 0.0, vel.z).length()
		if speed < params.slide_min_speed or elapsed > params.slide_duration:
			var end_shape: CapsuleShape3D = machine.player.shape_owner_get_shape(0, 0)
			if end_shape:
				end_shape.height = end_shape.height * 2.0
			machine.register_chain_mechanic("slide_end")
			machine.switch_to("ground")
			return
	else:
		var fall_shape: CapsuleShape3D = machine.player.shape_owner_get_shape(0, 0)
		if fall_shape:
			fall_shape.height = fall_shape.height * 2.0
		machine.on_ground = false
		machine.switch_to("air")

	if not machine.input_crouch or not machine.input_sprint:
		var cancel_shape: CapsuleShape3D = machine.player.shape_owner_get_shape(0, 0)
		if cancel_shape:
			cancel_shape.height = cancel_shape.height * 2.0
		machine.register_chain_mechanic("slide_cancel")
		machine.switch_to("ground")