Nostr (NIP-07)

// lib/nostr/provider.tsx — simplified
useEffect(() => {
  if (window.nostr) {
    const pk = await window.nostr.getPublicKey();
    setProvider(window.nostr);
    setPubkey(pk);
  } else if (mockProvider && process.env.NODE_ENV === 'development') {
    const pk = await mockProvider.getPublicKey();
    setProvider(mockProvider);
    setPubkey(pk);
  }
}, []);

interface NostrProvider {
  getPublicKey(): Promise<string>;
  signEvent(event: UnsignedNostrEvent): Promise<NostrEvent>;
  getRelays(): Promise<Record<string, { read: boolean; write: boolean }>>;
  nip04: Nip04;
}

const pubkey = await window.nostr!.getPublicKey();
// "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798"

interface UnsignedNostrEvent {
  created_at: number;
  kind: number;
  tags: string[][];
  content: string;
}

interface NostrEvent extends UnsignedNostrEvent {
  id: string;
  pubkey: string;
  sig: string;
}

const signed = await window.nostr!.signEvent({
  kind: 1,
  created_at: Math.floor(Date.now() / 1000),
  tags: [],
  content: 'Hello from a Fedi mini app',
});
// Publish signed to relays via nostr-tools or WebSocket

// { "wss://relay.damus.io": { read: true, write: true }, ... }
const relays = await window.nostr!.getRelays();

interface Nip04 {
  encrypt(pubkey: string, plaintext: string): Promise<string>;
  decrypt(pubkey: string, ciphertext: string): Promise<string>;
}

function useNostr(): {
  provider: NostrProvider | null;
  pubkey: string | null;
  npub: string | null;       // bech32-encoded pubkey
  isLoading: boolean;
  error: Error | null;
  isConnected: boolean;
}

function useIdentity(): {
  pubkey: string | null;
  npub: string | null;
  displayNpub: string | null;  // truncated "npub1abc...xyz"
  getPublicKey: () => Promise<string | null>;
  signEvent: (event: UnsignedNostrEvent) => Promise<NostrEvent | null>;
  isConnecting: boolean;
}

const { displayNpub, signEvent } = useIdentity();

if (!displayNpub) return <button onClick={getPublicKey}>Connect Nostr</button>;

// Deterministic test pubkey from privkey = 0x00...01
const provider = new MockNostrProvider();