import 'dart:typed_data';

import 'package:block2_spike/block2_spike.dart';
import 'package:test/test.dart';

/// Q3 — publish → discover a real offer by geohash against a running relay
/// (in-process, hermetic). Proves the flow works end to end and measures it.
void main() {
  late MiniRelay relay;

  setUp(() async => relay = await MiniRelay.start());
  tearDown(() async => relay.stop());

  NostrKey keyFor(int fill) =>
      NostrKey.deriveFromSeed(Uint8List(32)..fillRange(0, 32, fill));

  test('offer published by one identity is discovered by another via geohash',
      () async {
    final alice = keyFor(1);
    final bob = keyFor(2);

    final aliceTransport = await NostrOfferTransport.connect(
      relay.url,
      privateKeyHex: alice.privateKeyHex,
      pubkeyHex: alice.publicKeyHex,
    );
    final bobTransport = await NostrOfferTransport.connect(
      relay.url,
      privateKeyHex: bob.privateKeyHex,
      pubkeyHex: bob.publicKeyHex,
    );

    final offer = Offer(
      id: 'tomate-1',
      authorPubkeyHex: alice.publicKeyHex,
      summary: 'Tomate rosa de Barbastro',
      type: OfferType.gift,
      category: 'Solanaceae',
      approxGeohash: 'sp3e9xyz', // will be coarsened to sp3e9
    );

    final published = await aliceTransport.publish(offer);
    expect(published.accepted, isTrue,
        reason: 'relay OK: ${published.message}');

    // Bob queries a coarser area and still finds it (ladder match).
    final found = await bobTransport.discoverUntilEose(
      const DiscoveryQuery(geohashPrefix: 'sp3'),
    );
    expect(found, hasLength(1));
    expect(found.single.summary, 'Tomate rosa de Barbastro');
    expect(found.single.authorPubkeyHex, alice.publicKeyHex);

    await aliceTransport.close();
    await bobTransport.close();
  });

  test('a query for a different area returns nothing (geohash scoping works)',
      () async {
    final alice = keyFor(1);
    final t = await NostrOfferTransport.connect(
      relay.url,
      privateKeyHex: alice.privateKeyHex,
      pubkeyHex: alice.publicKeyHex,
    );
    await t.publish(Offer(
      id: 'x',
      authorPubkeyHex: alice.publicKeyHex,
      summary: 'Pimiento',
      type: OfferType.gift,
      approxGeohash: 'sp3e9',
    ));
    final elsewhere = await t.discoverUntilEose(
      const DiscoveryQuery(geohashPrefix: 'u09'),
    );
    expect(elsewhere, isEmpty);
    await t.close();
  });

  test('re-publishing the same offer id replaces (addressable), not duplicates',
      () async {
    final alice = keyFor(3);
    final t = await NostrOfferTransport.connect(
      relay.url,
      privateKeyHex: alice.privateKeyHex,
      pubkeyHex: alice.publicKeyHex,
    );
    Offer o(String summary) => Offer(
          id: 'lot-42',
          authorPubkeyHex: alice.publicKeyHex,
          summary: summary,
          type: OfferType.exchange,
          exchangeTerms: 'a cambio de legumbre',
          approxGeohash: 'sp3e9',
        );
    await t.publish(o('v1'));
    await t.publish(o('v2'));
    final found = await t.discoverUntilEose(
      const DiscoveryQuery(geohashPrefix: 'sp3e9'),
    );
    expect(found, hasLength(1), reason: 'addressable replace by (kind,pubkey,d)');
    expect(found.single.summary, 'v2');
    await t.close();
  });

  test('measures publish→discover latency (informational)', () async {
    final alice = keyFor(4);
    final t = await NostrOfferTransport.connect(
      relay.url,
      privateKeyHex: alice.privateKeyHex,
      pubkeyHex: alice.publicKeyHex,
    );
    final sw = Stopwatch()..start();
    await t.publish(Offer(
      id: 'latency',
      authorPubkeyHex: alice.publicKeyHex,
      summary: 'Calabaza',
      type: OfferType.gift,
      approxGeohash: 'sp3e9',
    ));
    final found = await t.discoverUntilEose(
      const DiscoveryQuery(geohashPrefix: 'sp3e9'),
    );
    sw.stop();
    expect(found, hasLength(1));
    // Not an assertion on wall-time (CI is noisy); just surface the number.
    printOnFailure('publish+discover round-trip: ${sw.elapsedMilliseconds} ms');
    // ignore: avoid_print
    print('[metric] publish+discover round-trip: ${sw.elapsedMilliseconds} ms');
    await t.close();
  });
}