extends CharacterBody3D

## NS-23: `NavigationAgent3D` path-follow for click-to-move visuals. Server owns `PositionState` /
## `MoveCommand` (NS-16, NS-19); boot snap vs post-verify nav goal from `main.gd`.

const MOVE_SPEED: float = 5.0

@onready var _nav_agent: NavigationAgent3D = $NavigationAgent3D


func _ready() -> void:
	_nav_agent.target_position = global_position


## After successful move POST + GET: walk to server target without teleporting.
func set_authoritative_nav_goal(world_pos: Vector3) -> void:
	_nav_agent.target_position = world_pos


## NS-19 rejection or cancel pending path without moving the body.
func clear_nav_goal() -> void:
	velocity = Vector3.ZERO
	_nav_agent.target_position = global_position


## Boot (and any hard reconcile): teleport to server position and reset agent.
func snap_to_server(world_pos: Vector3) -> void:
	global_position = world_pos
	velocity = Vector3.ZERO
	_nav_agent.target_position = world_pos


func _physics_process(_delta: float) -> void:
	if _nav_agent.is_navigation_finished():
		velocity = Vector3.ZERO
		move_and_slide()
		return

	var next_path_position: Vector3 = _nav_agent.get_next_path_position()
	var to_next: Vector3 = next_path_position - global_position
	to_next.y = 0.0
	if to_next.length_squared() < 0.0001:
		velocity = Vector3.ZERO
	else:
		velocity = to_next.normalized() * MOVE_SPEED
		velocity.y = 0.0
	move_and_slide()