import type { UserSession } from "@/services/orchestrationApi";

const SESSION_STORAGE_KEY = "chatbot_user";

export function getCurrentSession(): UserSession | null {
  try {
    const raw = localStorage.getItem(SESSION_STORAGE_KEY);
    return raw ? (JSON.parse(raw) as UserSession) : null;
  } catch {
    return null;
  }
}

export function writeSession(session: UserSession): void {
  localStorage.setItem(SESSION_STORAGE_KEY, JSON.stringify(session));
}

export function clearSession(): void {
  localStorage.removeItem(SESSION_STORAGE_KEY);
}

export function isSessionUsable(session = getCurrentSession()): boolean {
  if (!session?.user_id || !session.access_token || !session.refresh_token) return false;
  if (!session.refresh_expires_at) return true;
  const refreshExpiry = new Date(session.refresh_expires_at).getTime();
  if (Number.isNaN(refreshExpiry)) return true;
  if (refreshExpiry <= Date.now()) {
    clearSession();
    return false;
  }
  return true;
}