const IDLE_TTL_MS = 30 * 60 * 1000;

export function createHealthChannelSessionStore({ ttlMs = IDLE_TTL_MS } = {}) {
  const sessions = new Map();

  return {
    ttlMs,
    get(userId) {
      const key = String(userId);
      const current = sessions.get(key);
      if (!current) return null;
      if (Date.now() - current.updatedAt > ttlMs) {
        sessions.delete(key);
        return { expired: true, session: current };
      }
      return { expired: false, session: current };
    },
    set(userId, session) {
      sessions.set(String(userId), {
        ...session,
        updatedAt: Date.now(),
      });
    },
    clear(userId) {
      sessions.delete(String(userId));
    },
  };
}