import 'package:flat_buffers/flat_buffers.dart' as fb;
import 'package:flutter_test/flutter_test.dart';
import 'package:objectbox/internal.dart' show EntityDefinition;
import 'package:stadtbote/model/chat_message.dart';
import 'package:stadtbote/objectbox.g.dart';

void main() {
  group('ChatMessage IDs', () {
    test('initialisiert ausgehende Nachrichten vollständig', () {
      final message = _outgoingMessage();

      expect(message.id, 0);
      expect(message.toJson(), {
        'id': 42,
        'time': 1791366832,
        'from': 'courier-123',
        'subj': '',
        'text': 'Auftrag erledigt',
        'read': true,
      });
    });

    test('serialisiert ausgehende Nachrichten für ObjectBox ohne Fehler', () {
      final message = _outgoingMessage();
      final definition = getObjectBoxModel().bindings[ChatMessage]!
          as EntityDefinition<ChatMessage>;
      final builder = fb.Builder();

      expect(definition.objectToFB(message, builder), 0);

      final buffer = fb.BufferContext.fromBytes(builder.buffer);
      final root = buffer.derefObject(0);
      const intReader = fb.Int64Reader();
      const stringReader = fb.StringReader();

      expect(intReader.vTableGet(buffer, root, 4, -1), 0);
      expect(intReader.vTableGet(buffer, root, 6, -1), 42);
      expect(intReader.vTableGet(buffer, root, 8, -1), 1791366832);
      expect(stringReader.vTableGet(buffer, root, 10, ''), 'courier-123');
      expect(stringReader.vTableGet(buffer, root, 12, 'missing'), '');
      expect(stringReader.vTableGet(buffer, root, 14, ''), 'Auftrag erledigt');
      expect(const fb.BoolReader().vTableGet(buffer, root, 16, false), isTrue);
    });

    test('verwendet nach lokaler ID-Vergabe weiterhin die Nachrichten-ID', () {
      final message = _outgoingMessage();
      final definition = getObjectBoxModel().bindings[ChatMessage]!
          as EntityDefinition<ChatMessage>;

      definition.setId(message, 99);

      expect(message.id, 99);
      expect(message.externalId, 42);
      expect(message.toJson()['id'], 42);
    });

    test('übernimmt empfangene Server-IDs getrennt von der lokalen ID', () {
      final message = ChatMessage.fromJson({
        'id': 21891302,
        'time': 1791366832,
        'from': 'Zentrale',
        'subj': 'Rückfrage',
        'text': 'Bitte melden',
      });

      expect(message.id, 0);
      expect(message.externalId, 21891302);
      expect(message.read, isFalse);
      expect(message.toJson(), {
        'id': 21891302,
        'time': 1791366832,
        'from': 'Zentrale',
        'subj': 'Rückfrage',
        'text': 'Bitte melden',
        'read': false,
      });
    });
  });
}

ChatMessage _outgoingMessage() => ChatMessage.outgoing(
  externalId: 42,
  time: 1791366832,
  from: 'courier-123',
  text: 'Auftrag erledigt',
);