class_name SteamTransport
extends NetTransport

const SteamBootstrapScript = preload("res://scripts/steam_bootstrap.gd")

# The SteamMultiplayerPeer extension is looked up dynamically so a stock ENet
# build never references an unavailable native class while parsing scripts.
const VIRTUAL_PORT := 0

func transport_id() -> String:
	return "steam"


func is_available() -> bool:
	return SteamBootstrapScript.is_runtime_available()


func unavailable_reason() -> String:
	return SteamBootstrapScript.unavailable_reason()


func create_server(_port: int, _max_clients: int) -> Dictionary:
	var boot: Dictionary = SteamBootstrapScript.initialize()
	if int(boot.error) != OK:
		return boot
	var peer := ClassDB.instantiate("SteamMultiplayerPeer") as MultiplayerPeer
	if peer == null:
		return {"error": ERR_UNAVAILABLE, "reason": "SteamMultiplayerPeer could not be instantiated"}
	var err := int(peer.call("create_host", VIRTUAL_PORT))
	return {"error": err, "peer": peer if err == OK else null, "reason": error_string(err)}


func create_client(address: String, _port: int) -> Dictionary:
	var steam_id_text := address.strip_edges()
	if not steam_id_text.is_valid_int() or int(steam_id_text) <= 0:
		return {"error": ERR_INVALID_PARAMETER, "reason": "Steam transport requires the server's numeric Steam ID"}
	var boot: Dictionary = SteamBootstrapScript.initialize()
	if int(boot.error) != OK:
		return boot
	var peer := ClassDB.instantiate("SteamMultiplayerPeer") as MultiplayerPeer
	if peer == null:
		return {"error": ERR_UNAVAILABLE, "reason": "SteamMultiplayerPeer could not be instantiated"}
	var err := int(peer.call("create_client", int(steam_id_text), VIRTUAL_PORT))
	return {"error": err, "peer": peer if err == OK else null, "reason": error_string(err)}