extends Node3D

## NS-18: **Client preview only** — glow when `CharacterBody3D` is within horizontal radius of the
## prototype terminal (X/Z, inclusive). Server `POST …/interact` remains authoritative.

const ProtoIx = preload("res://scripts/prototype_interaction_constants.gd")
const EMISSION_DIM := 0.12
const EMISSION_BRIGHT := 7.0

@export var marker_paths: Array[NodePath] = [^"MarkerA", ^"MarkerB"]

var _player: CharacterBody3D
var _mat: StandardMaterial3D


func setup_player(player: CharacterBody3D) -> void:
	_player = player


func _ready() -> void:
	_mat = StandardMaterial3D.new()
	_mat.albedo_color = Color(0.1, 0.32, 0.9)
	_mat.emission_enabled = true
	_mat.emission = Color(0.3, 0.6, 1.0)
	_mat.emission_energy_multiplier = EMISSION_DIM
	for p in marker_paths:
		var mi := get_node_or_null(p) as MeshInstance3D
		if mi:
			mi.material_override = _mat


func _process(_delta: float) -> void:
	if _player == null or _mat == null:
		return
	var dx: float = _player.global_position.x - ProtoIx.anchor_x()
	var dz: float = _player.global_position.z - ProtoIx.anchor_z()
	var dist_sq: float = dx * dx + dz * dz
	var r: float = ProtoIx.interaction_radius()
	var in_range: bool = dist_sq <= r * r
	_mat.emission_energy_multiplier = EMISSION_BRIGHT if in_range else EMISSION_DIM