// Shared messaging helpers used by both the Messages page and the floating chat dock.
import { useSyncExternalStore } from "react";
import { api } from "./api";
import { isUnlocked, subscribeUnlock } from "./e2ee";

export const SYSTEM_ID = 0; // synthetic "Siftlode" system conversation partner id

// Set-once cache of partner public keys (the server is the directory; keys never change).
const pubCache = new Map<number, string>();
export async function partnerPub(partnerId: number): Promise<string> {
  const cached = pubCache.get(partnerId);
  if (cached) return cached;
  const r = await api.messagePublicKey(partnerId);
  pubCache.set(partnerId, r.public_key);
  return r.public_key;
}

// Live "is secure messaging unlocked on this device" — shared so the page and the dock agree.
export function useUnlocked(): boolean {
  return useSyncExternalStore(subscribeUnlock, isUnlocked, isUnlocked);
}