class_name NonPlayerCharacter
extends CharacterBody3D

@export var reacts_to_player:bool = true : 
	set (value):
		reacts_to_player = _set_reacts_to_player(value)
	get:
		return reacts_to_player

@onready var geometry: Node3D = null
@onready var player_detection: Area3D = %PlayerDetection
@onready var default_geometry: Node3D = %DefaultGeometry
@onready var animation_player: AnimationPlayer = %AnimationPlayer

const SPEED = 5.0
const JUMP_VELOCITY = 4.5

var tracking_node:Node3D = null
var look_direction:Vector3 = Vector3.BACK
var look_direction_damper:SpringDamper = SpringDamper.new(Vector3.ZERO, 2, 0.003, 0.003)

func _set_reacts_to_player(value:bool) -> bool:
	if player_detection != null:
		player_detection.monitoring = value
	return value

func _ready() -> void:
	player_detection.monitoring = reacts_to_player
	geometry = find_child("Geometry")
	
	if geometry == null:
		geometry = default_geometry
	else:
		default_geometry.visible = false
		animation_player.set_root("Geometry")

func _physics_process(delta: float) -> void:
	var damped_look_direction = look_direction_damper.calc_clamped_speed(geometry.global_basis.z, look_direction, delta, 3.141)

	if tracking_node != null:
		look_direction = (tracking_node.global_position - global_position).normalized()

	look_direction.y = position.y
	geometry.look_at(position - damped_look_direction, Vector3.UP)

func _on_player_detection_body_entered(body: Node3D) -> void:
	tracking_node = body

func _on_player_detection_body_exited(body: Node3D) -> void:
	look_direction = Vector3.BACK
	if body == tracking_node:
		tracking_node = null