class_name AssignmentState
extends RefCounted

# Verified assignment-ready manifest returned by the control plane. The join
# authorisation is retained in memory only and is never written to the restart
# snapshot; transport installation belongs to the explicit ENet/Steam layer.

var available := false
var match_id := ""
var server_id := ""
var slot := -1
var expires_at := ""
var protocol_version := 0
var transport := ""
var join_authorisation := ""
var error_message := ""


func apply(payload: Dictionary) -> bool:
	for key in ["match_id", "server_id", "player_id", "slot", "expires_at", "protocol_version", "transport", "join_authorisation"]:
		if not payload.has(key):
			return _reject("Assignment response is missing " + key)
	if not payload["match_id"] is String or not payload["server_id"] is String or not payload["player_id"] is String or not payload["slot"] is int or not payload["expires_at"] is String or not payload["protocol_version"] is int or not payload["transport"] is String or not payload["join_authorisation"] is String:
		return _reject("Assignment response contains invalid types")
	var next_match_id := String(payload["match_id"])
	var next_server_id := String(payload["server_id"])
	var next_transport := String(payload["transport"])
	if next_match_id.is_empty() or next_server_id.is_empty() or String(payload["player_id"]).is_empty() or int(payload["slot"]) < 0 or int(payload["slot"]) > 5 or int(payload["protocol_version"]) < 1 or (next_transport != "enet" and next_transport != "steam_sdr") or String(payload["expires_at"]).is_empty() or String(payload["join_authorisation"]).is_empty():
		return _reject("Assignment response contains invalid values")
	match_id = next_match_id
	server_id = next_server_id
	slot = int(payload["slot"])
	expires_at = String(payload["expires_at"])
	protocol_version = int(payload["protocol_version"])
	transport = next_transport
	join_authorisation = String(payload["join_authorisation"])
	available = true
	error_message = ""
	return true


func _reject(reason: String) -> bool:
	available = false
	error_message = reason
	return false