settled-reach/client/ui/implant/implant_registry.gd

extends Node
## Lazy registry of installed implant apps (#844, D-191).
## Autoload — scans apps/*/app.tres on first get_manifests() call.
## Does NOT reference ImplantAppManifest or ImplantApp class_names at load time
## (autoload parse-order rule; see CLAUDE.md).

const CURRENT_SCHEMA_VERSION := 1
const _MODE_MAP: Dictionary = {"gameplay": 0, "insert": 1, "fullscreen": 2}

var _manifests: Array = []  # Array[ImplantAppManifest]
var _resolved_modes: Dictionary = {}  # app_path -> HudGroups.Mode int
var _instances: Dictionary = {}  # app_path -> ImplantApp
var _scanned: bool = false


func get_manifests() -> Array:
	if not _scanned:
		_scan()
	return _manifests


func get_resolved_mode(app_path: String) -> int:
	if not _scanned:
		_scan()
	return _resolved_modes.get(app_path, HudGroups.Mode.FULLSCREEN)


## Instantiate all registered apps whose manifest declares a scene_path and add
## them as children of parent. Manifests without scene_path are metadata-only
## and are silently skipped. Called from hud.gd._ready() — not from _ready() here.
func instantiate_all(parent: Node) -> void:
	for m in get_manifests():
		var scene_path: String = m.scene_path
		if scene_path.is_empty():
			continue
		if not ResourceLoader.exists(scene_path):
			push_warning(
				"ImplantRegistry: scene_path not found for %s: %s" % [m.app_path, scene_path]
			)
			continue
		var packed = load(scene_path)
		if not (packed is PackedScene):
			push_warning("ImplantRegistry: %s is not a PackedScene" % scene_path)
			continue
		var instance = packed.instantiate()
		_instances[m.app_path] = instance
		parent.add_child(instance)


## Return the live ImplantApp instance for app_path, or null if not instantiated.
func get_app_instance(app_path: String):  # returns ImplantApp
	return _instances.get(app_path, null)


func _scan() -> void:
	_scanned = true
	_manifests.clear()
	_resolved_modes.clear()
	var key_owners: Dictionary = {}  # default_key -> app_path (collision detection)
	var dir := DirAccess.open("res://ui/implant/apps")
	if dir == null:
		push_warning("ImplantRegistry: could not open res://ui/implant/apps")
		return
	dir.list_dir_begin()
	var entry := dir.get_next()
	while not entry.is_empty():
		if dir.current_is_dir() and not entry.begins_with("."):
			var tres_path: String = "res://ui/implant/apps/%s/app.tres" % entry
			if ResourceLoader.exists(tres_path):
				var m = load(tres_path)
				if not _is_valid_manifest(m):
					push_warning("ImplantRegistry: invalid or missing app_path in %s" % tres_path)
				else:
					var app_path: String = m.app_path
					var mode_str: String = m.default_mode
					var default_key: int = m.default_key
					var schema_ver: int = m.schema_version
					# Schema version check — best-effort in both directions
					if schema_ver < CURRENT_SCHEMA_VERSION:
						print_verbose(
							"ImplantRegistry: backfilled manifest from v%d at %s" % [
								schema_ver, tres_path
							]
						)
					elif schema_ver > CURRENT_SCHEMA_VERSION:
						push_warning(
							"ImplantRegistry: manifest at %s declares schema_version %d; this build supports v%d; proceeding best-effort" % [
								tres_path, schema_ver, CURRENT_SCHEMA_VERSION
							]
						)
					if not _MODE_MAP.has(mode_str):
						push_warning(
							"ImplantRegistry: invalid default_mode \"%s\" in %s — skipping" % [
								mode_str, tres_path
							]
						)
					elif default_key >= 0 and key_owners.has(default_key):
						push_warning(
							"ImplantRegistry: key binding collision — key %d already bound to %s, skipping %s" % [
								default_key, key_owners[default_key], app_path
							]
						)
					else:
						if default_key >= 0:
							key_owners[default_key] = app_path
						_resolved_modes[app_path] = _MODE_MAP[mode_str]
						_manifests.append(m)
		entry = dir.get_next()
	dir.list_dir_end()


func _is_valid_manifest(m: Variant) -> bool:
	if m == null:
		return false
	if not (m is Resource):
		return false
	if not "app_path" in m:
		return false
	return not (m.app_path as String).is_empty()