export interface Settings {
  serverUrl: string;
  token: string;
}

const STORAGE_KEY: string = "lvmh.settings";

export function getSettings(): Settings | null {
  try {
    const raw = localStorage.getItem(STORAGE_KEY);
    if (raw === null) return null;
    const parsed: unknown = JSON.parse(raw);
    if (
      parsed !== null &&
      typeof parsed === "object" &&
      typeof (parsed as { serverUrl?: unknown }).serverUrl === "string" &&
      typeof (parsed as { token?: unknown }).token === "string"
    ) {
      return parsed as Settings;
    }
    return null;
  } catch {
    return null;
  }
}

export function saveSettings(settings: Settings): void {
  localStorage.setItem(STORAGE_KEY, JSON.stringify(settings));
}

export function clearSettings(): void {
  localStorage.removeItem(STORAGE_KEY);
}

export function buildWsUrl(settings: Settings): string {
  const base = settings.serverUrl.replace(/\/+$/, "").replace(/^http/, "ws");
  return `${base}/ws?token=${encodeURIComponent(settings.token)}`;
}