/**
 * In-Memory Session Store für SOS-Streaming
 *
 * POST /api/coach/sos-session speichert messages/locale hier,
 * GET /api/coach/sos-stream lädt sie per sessionId.
 *
 * TTL: 5 Minuten (Auto-Cleanup)
 */
type SosSessionData = {
  userId: string;
  messages: Array<{ role: "user" | "assistant"; content: string }>;
  locale: string;
  /** A/B-Test: client wählt LLM via Toggle. Default openrouter-sonnet. */
  llmProvider?: string;
  createdAt: number;
};

const sessions = new Map<string, SosSessionData>();
const SESSION_TTL = 5 * 60 * 1000; // 5min

// Cleanup-Intervall: alle 2min alte Sessions löschen
setInterval(
  () => {
    const now = Date.now();
    for (const [id, data] of sessions.entries()) {
      if (now - data.createdAt > SESSION_TTL) {
        sessions.delete(id);
      }
    }
  },
  2 * 60 * 1000,
);

export function setSosSession(sessionId: string, data: SosSessionData) {
  sessions.set(sessionId, data);
}

export function getSosSession(sessionId: string): SosSessionData | undefined {
  const data = sessions.get(sessionId);
  if (!data) return undefined;
  // TTL-Check
  if (Date.now() - data.createdAt > SESSION_TTL) {
    sessions.delete(sessionId);
    return undefined;
  }
  return data;
}

export function deleteSosSession(sessionId: string) {
  sessions.delete(sessionId);
}