class_name CockpitPressureBulkhead
extends Node3D

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

const PANEL_COUNT := 1
const FASTENER_COUNT := 16
const ANGULAR_STEPS := 64
const RADIAL_STEPS := 4
const INNER_RADIUS := 0.72
const OUTER_RADIUS := 1.11

var _materials: CockpitMaterialPalette
var _panel_count := 0


func _ready() -> void:
	_materials = CockpitMaterialPalette.new()
	_hide_rectangular_whitebox()
	_style_existing_frame()
	_build_curved_panels()
	_build_outer_rib()
	_build_fasteners()


func panel_count() -> int:
	return _panel_count


func rectangular_whitebox_is_hidden() -> bool:
	for node_name: String in ["LeftBulkhead", "RightBulkhead", "TopBulkhead", "BottomBulkhead"]:
		var whitebox := get_parent().get_node_or_null(node_name) as MeshInstance3D
		if whitebox != null and whitebox.visible:
			return false
	return true


func _hide_rectangular_whitebox() -> void:
	for node_name: String in ["LeftBulkhead", "RightBulkhead", "TopBulkhead", "BottomBulkhead"]:
		var whitebox := get_parent().get_node_or_null(node_name) as MeshInstance3D
		if whitebox != null:
			whitebox.visible = false


func _style_existing_frame() -> void:
	var frame := get_parent().get_node_or_null("WindowFrame") as MeshInstance3D
	if frame != null:
		frame.material_override = _materials.brushed_steel
	for child: Node in get_parent().get_children():
		if child is MeshInstance3D and child.name.begins_with("Bolt"):
			(child as MeshInstance3D).material_override = _materials.dark_steel


func _build_curved_panels() -> void:
	var panel_angle := TAU / float(PANEL_COUNT)
	for panel_index in PANEL_COUNT:
		var start_angle := panel_index * panel_angle
		var end_angle := (panel_index + 1) * panel_angle
		var panel := MeshInstance3D.new()
		panel.name = "PressurePanel%02d" % (panel_index + 1)
		panel.mesh = _create_curved_panel_mesh(start_angle, end_angle)
		panel.material_override = _materials.overhead_steel
		panel.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_ON
		add_child(panel)
		_panel_count += 1


func _create_curved_panel_mesh(start_angle: float, end_angle: float) -> ArrayMesh:
	var surface := SurfaceTool.new()
	surface.begin(Mesh.PRIMITIVE_TRIANGLES)
	for angular_index in ANGULAR_STEPS:
		var angle_ratio_0 := float(angular_index) / float(ANGULAR_STEPS)
		var angle_ratio_1 := float(angular_index + 1) / float(ANGULAR_STEPS)
		var angle_0 := lerpf(start_angle, end_angle, angle_ratio_0)
		var angle_1 := lerpf(start_angle, end_angle, angle_ratio_1)
		for radial_index in RADIAL_STEPS:
			var radial_ratio_0 := float(radial_index) / float(RADIAL_STEPS)
			var radial_ratio_1 := float(radial_index + 1) / float(RADIAL_STEPS)
			_add_panel_quad(
				surface,
				angle_0,
				angle_1,
				angle_ratio_0,
				angle_ratio_1,
				radial_ratio_0,
				radial_ratio_1
			)
	surface.generate_normals()
	return surface.commit()


func _add_panel_quad(
	surface: SurfaceTool,
	angle_0: float,
	angle_1: float,
	angle_ratio_0: float,
	angle_ratio_1: float,
	radial_ratio_0: float,
	radial_ratio_1: float
) -> void:
	_add_panel_vertex(surface, angle_0, angle_ratio_0, radial_ratio_0)
	_add_panel_vertex(surface, angle_1, angle_ratio_1, radial_ratio_0)
	_add_panel_vertex(surface, angle_0, angle_ratio_0, radial_ratio_1)
	_add_panel_vertex(surface, angle_0, angle_ratio_0, radial_ratio_1)
	_add_panel_vertex(surface, angle_1, angle_ratio_1, radial_ratio_0)
	_add_panel_vertex(surface, angle_1, angle_ratio_1, radial_ratio_1)


func _add_panel_vertex(
	surface: SurfaceTool,
	angle: float,
	angle_ratio: float,
	radial_ratio: float
) -> void:
	var radius := lerpf(INNER_RADIUS, OUTER_RADIUS, radial_ratio)
	var convex_depth := sin(radial_ratio * PI) * 0.075
	surface.set_uv(Vector2(angle_ratio, radial_ratio))
	surface.add_vertex(
		Vector3(cos(angle) * radius, sin(angle) * radius, 0.045 + convex_depth)
	)


func _build_outer_rib() -> void:
	var rib := MeshInstance3D.new()
	rib.name = "OuterPressureRib"
	var torus := TorusMesh.new()
	torus.inner_radius = 1.055
	torus.outer_radius = 1.125
	torus.rings = 64
	torus.ring_segments = 12
	rib.mesh = torus
	rib.material_override = _materials.dark_steel
	rib.rotation_degrees.x = 90.0
	rib.position.z = 0.025
	add_child(rib)
	var inner_rib := MeshInstance3D.new()
	inner_rib.name = "InnerPressureRib"
	var inner_torus := TorusMesh.new()
	inner_torus.inner_radius = 0.695
	inner_torus.outer_radius = 0.755
	inner_torus.rings = 64
	inner_torus.ring_segments = 12
	inner_rib.mesh = inner_torus
	inner_rib.material_override = _materials.brushed_steel
	inner_rib.rotation_degrees.x = 90.0
	inner_rib.position.z = 0.075
	add_child(inner_rib)


func _build_fasteners() -> void:
	for fastener_index in FASTENER_COUNT:
		var angle := (fastener_index + 0.5) * TAU / float(FASTENER_COUNT)
		CockpitMeshFactory.add_cylinder(
			"OuterFastener",
			self,
			Vector3(cos(angle) * 0.96, sin(angle) * 0.96, 0.105),
			0.014,
			0.018,
			_materials.brass,
			Vector3(90.0, 0.0, 0.0)
		)