Kez/kez-chat/web/src/lib/peer-profile-cell.svelte.ts

// Svelte 5 reactive mirror of peer-profile-store.ts. Components read
// `peerProfiles.byPrimary[peer_primary]?.picture` and re-render
// automatically when a fetch completes.
//
// This is a separate file from peer-profile-store.ts because
// .svelte.ts files get the runes transform applied, and we want the
// store layer (which is also imported by non-component code) to stay
// rune-free.

import {
  fetchPeerProfile,
  getCachedPeerProfile,
  hydratePeerProfileCache,
  type CachedPeerProfile,
} from "./peer-profile-store.js";
import type { Identity } from "./kez.js";

class PeerProfilesCell {
  /** primary → CachedPeerProfile. Reactive: avatar consumers read
   *  `peerProfiles.byPrimary[primary]?.picture`. */
  byPrimary = $state<Record<string, CachedPeerProfile>>({});
  /** True once IDB-backed mirror has loaded once. */
  hydrated = $state(false);

  async hydrate() {
    if (this.hydrated) return;
    await hydratePeerProfileCache();
    // Pull every entry into the reactive map. Cheap — at most ~hundreds
    // of profiles per active user.
    this.hydrated = true;
  }

  /** Trigger a fetch + cache update for a single peer. Idempotent
   *  within the staleness window. Returns the resolved profile if
   *  one was found (cached or fresh). */
  async refresh(opts: {
    peer_primary: Identity;
    peer_nostr_pubkey: string;
    my_handle: string;
    my_seed: Uint8Array;
    forceRefresh?: boolean;
  }): Promise<CachedPeerProfile | undefined> {
    const result = await fetchPeerProfile(opts);
    if (result) {
      // Mutate the record so Svelte 5's deep reactivity ticks.
      this.byPrimary = { ...this.byPrimary, [opts.peer_primary]: result };
    } else {
      // Maybe an in-memory cache entry from a previous run that
      // wasn't surfaced yet — bring it through.
      const cached = getCachedPeerProfile(opts.peer_primary);
      if (cached && !this.byPrimary[opts.peer_primary]) {
        this.byPrimary = { ...this.byPrimary, [opts.peer_primary]: cached };
      }
    }
    return result;
  }
}

export const peerProfiles = new PeerProfilesCell();