import 'package:flutter_test/flutter_test.dart';
import 'package:motorcycle_dash/services/clubs/club_service.dart';

void main() {
  group('ClubService Validation & Invariant Contracts', () {
    test('reports availability correctly when offline', () {
      final service = ClubService();
      expect(service.isAvailable, isFalse);
    });

    test('rejects club creation when unauthenticated or caller UID missing', () async {
      final service = ClubService();

      expect(
        () => service.createClub(
          name: 'Bay Area Riders',
          slug: 'bay-area-riders',
        ),
        throwsA(isA<ClubOperationException>().having(
          (e) => e.code,
          'code',
          equals('unauthenticated'),
        )),
      );
    });

    test('rejects club creation with invalid name length', () async {
      final service = ClubService();

      // Too short (< 3)
      expect(
        () => service.createClub(
          name: 'AB',
          slug: 'valid-slug',
          callerUid: 'alice',
        ),
        throwsA(isA<ClubOperationException>().having(
          (e) => e.code,
          'code',
          equals('invalid-name'),
        )),
      );

      // Too long (> 50)
      expect(
        () => service.createClub(
          name: 'A' * 51,
          slug: 'valid-slug',
          callerUid: 'alice',
        ),
        throwsA(isA<ClubOperationException>().having(
          (e) => e.code,
          'code',
          equals('invalid-name'),
        )),
      );
    });

    test('rejects club creation with invalid slug format or reserved keywords', () async {
      final service = ClubService();

      // Invalid slug format (underscores)
      expect(
        () => service.createClub(
          name: 'Valid Name',
          slug: 'invalid_slug_with_underscores',
          callerUid: 'alice',
        ),
        throwsA(isA<ClubOperationException>().having(
          (e) => e.code,
          'code',
          equals('invalid-slug'),
        )),
      );

      // Reserved slug
      expect(
        () => service.createClub(
          name: 'Valid Name',
          slug: 'admin',
          callerUid: 'alice',
        ),
        throwsA(isA<ClubOperationException>().having(
          (e) => e.code,
          'code',
          equals('invalid-slug'),
        )),
      );
    });

    test('rejects ownership transfer to self', () async {
      final service = ClubService();

      expect(
        () => service.transferOwnership(
          'club_1',
          'alice',
          callerUid: 'alice',
        ),
        throwsA(isA<ClubOperationException>().having(
          (e) => e.code,
          'code',
          equals('invalid-target'),
        )),
      );
    });

    test('gracefully returns null/empty for streams when offline', () async {
      final service = ClubService();

      final club = await service.getClub('club_1');
      expect(club, isNull);

      final member = await service.getMember('club_1', 'alice');
      expect(member, isNull);

      final clubStream = service.clubStream('club_1');
      expect(await clubStream.first, isNull);

      final memberStream = service.memberStream('club_1', 'alice');
      expect(await memberStream.first, isNull);

      final activeStream = service.activeMembersStream('club_1');
      expect(await activeStream.first, isEmpty);

      final pendingStream = service.pendingRequestsStream('club_1');
      expect(await pendingStream.first, isEmpty);

      final myClubsStream = service.myActiveClubsStream('alice');
      expect(await myClubsStream.first, isEmpty);

      final myInvitesStream = service.myInvitationsStream('alice');
      expect(await myInvitesStream.first, isEmpty);

      final discovery = await service.discoverPublicClubs();
      expect(discovery, isEmpty);
    });
  });
}