extends Node


var message_types: Dictionary[String, Array] = {}


func subscribe(id: String, callback: Callable) -> void:
	if not message_types.has(id):
		message_types.set(id, Array())

	message_types.get(id).append(callback)


func emit(id: String, data: Variant) -> void:
	emit_propagation(id, data)


# TODO: Need to actually validate client request. Also, message bus is more
#       about server talking to clients than clients to server. I.E, reducing
#       the number of needed @rpc method decorator bindings.
@rpc("any_peer", "call_remote", "reliable")
func emit_request(id: String, data: Variant, expand: bool = false) -> void:
	if not multiplayer.is_server(): return

	var listeners: Array = message_types.get(id)
	if not listeners:
		push_error("'%s' not an existing message type to send...", [id])
		return

	emit_propagation(id, data, expand)

@rpc("authority", "call_local", "reliable")
func emit_propagation(id: String, data: Variant, expand: bool = false) -> void:
	var listeners: Array = message_types.get(id)
	if not listeners:
		push_error("'%s' not an existing message type to send...", [id])
		return

	for callback: Callable in listeners:
		if not expand:
			callback.call(data)
		else:
			callback.callv(data)

@rpc("authority", "call_remote", "reliable")
func emit_propagation_clients_only(id: String, data: Variant, expand: bool = false) -> void:
	var listeners: Array = message_types.get(id)
	if not listeners:
		push_error("'%s' not an existing message type to send...", [id])
		return

	for callback: Callable in listeners:
		if not expand:
			callback.call(data)
		else:
			callback.callv(data)