import 'dart:convert';

import 'package:bip340/bip340.dart' as bip340;
import 'package:crypto/crypto.dart';
import 'package:swarm/swarm.dart';
import 'package:test/test.dart';

const _privKey =
    '0000000000000000000000000000000000000000000000000000000000000001';

void main() {
  late NostrSignerActor signer;

  setUp(() {
    signer = NostrSignerActor(_privKey);
  });

  test('GetPublicKey returns correct pubkey', () async {
    final result = await signer.handle(const GetPublicKey());
    expect(result, isA<PublicKeyResult>());
    expect(
      (result as PublicKeyResult).publicKey,
      equals(bip340.getPublicKey(_privKey)),
    );
  });

  test('SignEvent returns EventSigned', () async {
    final result = await signer.handle(
      const SignEvent(kind: 1, content: 'hello'),
    );
    expect(result, isA<EventSigned>());
  });

  test('signed event has all required fields', () async {
    final result = await signer.handle(
      const SignEvent(kind: 1, tags: [], content: 'test content'),
    );
    final event =
        jsonDecode((result as EventSigned).event) as Map<String, dynamic>;
    expect(event.containsKey('id'), isTrue);
    expect(event.containsKey('pubkey'), isTrue);
    expect(event.containsKey('created_at'), isTrue);
    expect(event.containsKey('kind'), isTrue);
    expect(event.containsKey('tags'), isTrue);
    expect(event.containsKey('content'), isTrue);
    expect(event.containsKey('sig'), isTrue);
  });

  test('event id is correct SHA-256', () async {
    const kind = 1;
    const content = 'sha256 test';
    const tags = <List<String>>[];
    const ts = 1700000000;

    final result = await signer.handle(
      const SignEvent(kind: kind, tags: tags, content: content, createdAt: ts),
    );
    final event =
        jsonDecode((result as EventSigned).event) as Map<String, dynamic>;

    final pubkey = bip340.getPublicKey(_privKey);
    final ser = jsonEncode([0, pubkey, ts, kind, tags, content]);
    final expectedId = sha256
        .convert(utf8.encode(ser))
        .bytes
        .map((b) => b.toRadixString(16).padLeft(2, '0'))
        .join();

    expect(event['id'], equals(expectedId));
  });

  test('signature verifies', () async {
    final result = await signer.handle(
      const SignEvent(kind: 1, content: 'verify me', createdAt: 1700000000),
    );
    final event =
        jsonDecode((result as EventSigned).event) as Map<String, dynamic>;
    final pubkey = event['pubkey'] as String;
    final id = event['id'] as String;
    final sig = event['sig'] as String;

    expect(bip340.verify(pubkey, id, sig), isTrue);
  });

  test('createdAt is used when provided', () async {
    const ts = 1234567890;
    final result = await signer.handle(
      const SignEvent(kind: 1, content: 'timestamp test', createdAt: ts),
    );
    final event =
        jsonDecode((result as EventSigned).event) as Map<String, dynamic>;
    expect(event['created_at'], equals(ts));
  });

  test('createdAt defaults to now', () async {
    final before = DateTime.now().millisecondsSinceEpoch ~/ 1000;
    final result = await signer.handle(
      const SignEvent(kind: 1, content: 'now test'),
    );
    final after = DateTime.now().millisecondsSinceEpoch ~/ 1000;
    final event =
        jsonDecode((result as EventSigned).event) as Map<String, dynamic>;
    final ts = event['created_at'] as int;
    expect(ts, greaterThanOrEqualTo(before));
    expect(ts, lessThanOrEqualTo(after + 2));
  });

  test('Nip44Encrypt round-trips to self', () async {
    final plaintext = jsonEncode({'blur_content_warnings': 'false', 'x': '1'});
    final encrypted = await signer.handle(Nip44Encrypt(plaintext)) as Nip44Text;
    expect(encrypted.value, isNot(equals(plaintext)));

    // Payload is base64 with the NIP-44 v2 version byte (0x02) first.
    final bytes = base64.decode(encrypted.value);
    expect(bytes.first, equals(0x02));

    final decrypted =
        await signer.handle(Nip44Decrypt(encrypted.value)) as Nip44Text;
    expect(decrypted.value, equals(plaintext));
  });

  test('Nip44Decrypt with a foreign key fails', () async {
    final encrypted =
        await signer.handle(const Nip44Encrypt('secret')) as Nip44Text;
    final other = NostrSignerActor(
      '0000000000000000000000000000000000000000000000000000000000000002',
    );
    expect(
      () => other.handle(Nip44Decrypt(encrypted.value)),
      throwsA(anything),
    );
  });
}