class_name CockpitPressureBulkhead
extends Node3D

## Imported pressure hull (end cap, knuckle and barrel in one shell) and the
## porthole bolted into it. Both models are instanced by `cockpit_interior.tscn`.

## The porthole glass lives alone on render layer 2 so interior lights that
## sit right behind it (the cool porthole fill) can leave it out of their cull
## mask instead of mirroring themselves as a hard specular point.
const PORTHOLE_GLASS_RENDER_LAYER_BIT := 1 << 1
## Imported glass is near-mirror smooth; a little roughness turns the remaining
## lamp reflections into soft smears rather than pinpoints.
const PORTHOLE_GLASS_ROUGHNESS := 0.45

const CockpitMeshFactory = preload(
	"res://game/presentation/cockpit/cockpit_mesh_factory.gd"
)

const WHITEBOX_NAMES: Array[String] = [
	"LeftBulkhead",
	"RightBulkhead",
	"TopBulkhead",
	"BottomBulkhead",
]

var _hull_shells: Array[Node] = []
var _porthole_frame: MeshInstance3D
var _porthole_glass: MeshInstance3D


func _ready() -> void:
	var hull := get_node_or_null("HullWall")
	if hull != null:
		_hull_shells = hull.find_children("*", "MeshInstance3D", true, false)
	_porthole_frame = _find_mesh("Porthole")
	_porthole_glass = _find_mesh("PortholeGlass")
	if _hull_shells.is_empty() or _porthole_frame == null or _porthole_glass == null:
		push_error("Pressure hull or porthole model is missing a node")
		return
	_porthole_glass.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
	_porthole_glass.layers = PORTHOLE_GLASS_RENDER_LAYER_BIT
	var glass_material := CockpitMeshFactory.own_surface_material(_porthole_glass)
	if glass_material != null:
		glass_material.roughness = PORTHOLE_GLASS_ROUGHNESS


func glass_is_on_dedicated_layer() -> bool:
	return _porthole_glass != null and _porthole_glass.layers == PORTHOLE_GLASS_RENDER_LAYER_BIT


func glass_roughness() -> float:
	if _porthole_glass == null:
		return 0.0
	var material := _porthole_glass.get_active_material(0) as BaseMaterial3D
	return 0.0 if material == null else material.roughness


func panel_count() -> int:
	return _hull_shells.size()


func hull_shell() -> MeshInstance3D:
	return null if _hull_shells.is_empty() else _hull_shells[0] as MeshInstance3D


func porthole_frame() -> MeshInstance3D:
	return _porthole_frame


func porthole_glass() -> MeshInstance3D:
	return _porthole_glass


func rectangular_whitebox_is_hidden() -> bool:
	for node_name: String in WHITEBOX_NAMES:
		var whitebox := get_parent().get_node_or_null(node_name) as MeshInstance3D
		if whitebox != null and whitebox.visible:
			return false
	return true


func _find_mesh(mesh_name: String) -> MeshInstance3D:
	var matches := find_children(mesh_name, "MeshInstance3D", true, false)
	return null if matches.is_empty() else matches[0] as MeshInstance3D