extends Node3D

var _rotation_target_x : Vector3
var _rotation_target_y : Vector3
@export var _cam : Camera3D
@export var _ray : RayCast3D


# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	_rotation_target_y = self.rotation
	_rotation_target_x = _cam.rotation
	Input.mouse_mode = Input.MOUSE_MODE_CAPTURED


# TODO: Interpolation.
# TODO: Hiding/Popping animation.
func _physics_process(_delta: float) -> void:
	var wmark := get_parent_node_3d().get_node("WallMark") as Sprite3D
	var fmark := get_parent_node_3d().get_node("FloorMark") as Sprite3D
	# Walls.
	if _ray.is_colliding() and (_ray.get_collider() as StaticBody3D).get_collision_layer_value(3):
		var normflat := Vector3(_ray.get_collision_normal().x, 0, _ray.get_collision_normal().z)
		var posflat := Vector3(_ray.get_collision_point().x, 0, _ray.get_collision_point().z)
		wmark.look_at_from_position(posflat, posflat + normflat, Vector3.UP)
		wmark.position = posflat + normflat
		wmark.show()
	else:
		wmark.hide()

	# Floor.
	if _ray.is_colliding() and (_ray.get_collider() as StaticBody3D).get_collision_layer_value(2):
		var posflat := Vector3(_ray.get_collision_point().x, 0, _ray.get_collision_point().z)
		fmark.position = posflat
		fmark.show()
	else:
		fmark.hide()


# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	self.rotation.y = lerp_angle(_rotation_target_y.y, _rotation_target_y.y, 1.0 - exp(-30 * delta))
	_cam.rotation.x = lerp_angle(_cam.rotation.x, _rotation_target_x.x, 1.0 - exp(-20 * delta))


func _input(event: InputEvent) -> void:
	if event is InputEventMouseMotion and Input.get_mouse_mode() == Input.MOUSE_MODE_CAPTURED:
		var motion := event as InputEventMouseMotion
		var preserve := rotation
		rotation = _rotation_target_y
		self.rotate_y(deg_to_rad(motion.relative.x) * -0.25)
		_rotation_target_y = rotation
		rotation = preserve

		preserve = _cam.rotation
		_cam.rotate_x(deg_to_rad(motion.relative.y) * -0.2)
		var camera_rot := _cam.rotation_degrees
		camera_rot.x = clamp(camera_rot.x, -30, 30)
		_cam.rotation_degrees = camera_rot
		_rotation_target_x = _cam.rotation
		_cam.rotation = preserve