import 'package:flutter_test/flutter_test.dart';
import 'package:votianlt_app/models/message_envelope.dart';

void main() {
  group('MessageEnvelope', () {
    group('fromJson', () {
      test('parses all required fields correctly', () {
        final json = {
          'messageId': 'test-uuid-123',
          'timestamp': '2024-01-15T10:30:00.000Z',
          'topic': '/server/user123/message',
          'payload': {'key': 'value'},
        };

        final envelope = MessageEnvelope.fromJson(json);

        expect(envelope.messageId, 'test-uuid-123');
        expect(envelope.timestamp, DateTime.utc(2024, 1, 15, 10, 30, 0));
        expect(envelope.topic, '/server/user123/message');
        expect(envelope.payload, {'key': 'value'});
        expect(envelope.requiresAck, true); // default
        expect(envelope.retryCount, 0); // default
        expect(envelope.expiresAt, isNull);
      });

      test('parses optional fields when present', () {
        final json = {
          'messageId': 'test-uuid-456',
          'timestamp': '2024-01-15T10:30:00.000Z',
          'topic': '/server/user123/message',
          'payload': {'data': 123},
          'requiresAck': false,
          'retryCount': 3,
          'expiresAt': '2024-01-15T11:30:00.000Z',
        };

        final envelope = MessageEnvelope.fromJson(json);

        expect(envelope.requiresAck, false);
        expect(envelope.retryCount, 3);
        expect(envelope.expiresAt, DateTime.utc(2024, 1, 15, 11, 30, 0));
      });

      test('handles list payload', () {
        final json = {
          'messageId': 'test-uuid-789',
          'timestamp': '2024-01-15T10:30:00.000Z',
          'topic': '/server/user123/jobs',
          'payload': [
            {'id': '1'},
            {'id': '2'}
          ],
        };

        final envelope = MessageEnvelope.fromJson(json);

        expect(envelope.payload, isList);
        expect(envelope.payload.length, 2);
      });

      test('handles null payload', () {
        final json = {
          'messageId': 'test-uuid-null',
          'timestamp': '2024-01-15T10:30:00.000Z',
          'topic': '/server/user123/ping',
          'payload': null,
        };

        final envelope = MessageEnvelope.fromJson(json);

        expect(envelope.payload, isNull);
      });
    });

    group('toJson', () {
      test('serializes all fields correctly', () {
        final envelope = MessageEnvelope(
          messageId: 'test-uuid-123',
          timestamp: DateTime.utc(2024, 1, 15, 10, 30, 0),
          topic: '/server/user123/message',
          payload: {'key': 'value'},
          requiresAck: true,
          retryCount: 2,
          expiresAt: DateTime.utc(2024, 1, 15, 11, 30, 0),
        );

        final json = envelope.toJson();

        expect(json['messageId'], 'test-uuid-123');
        expect(json['timestamp'], '2024-01-15T10:30:00.000Z');
        expect(json['topic'], '/server/user123/message');
        expect(json['payload'], {'key': 'value'});
        expect(json['requiresAck'], true);
        expect(json['retryCount'], 2);
        expect(json['expiresAt'], '2024-01-15T11:30:00.000Z');
      });

      test('omits expiresAt when null', () {
        final envelope = MessageEnvelope(
          messageId: 'test-uuid-123',
          timestamp: DateTime.utc(2024, 1, 15, 10, 30, 0),
          topic: '/server/user123/message',
          payload: {'key': 'value'},
        );

        final json = envelope.toJson();

        expect(json.containsKey('expiresAt'), false);
      });
    });

    group('fromJson/toJson roundtrip', () {
      test('preserves all data through serialization', () {
        final original = MessageEnvelope(
          messageId: 'roundtrip-uuid',
          timestamp: DateTime.utc(2024, 1, 15, 10, 30, 0),
          topic: '/server/user123/message',
          payload: {'nested': {'key': 'value'}, 'list': [1, 2, 3]},
          requiresAck: false,
          retryCount: 5,
          expiresAt: DateTime.utc(2024, 1, 16, 10, 30, 0),
        );

        final json = original.toJson();
        final restored = MessageEnvelope.fromJson(json);

        expect(restored.messageId, original.messageId);
        expect(restored.timestamp, original.timestamp);
        expect(restored.topic, original.topic);
        expect(restored.payload, original.payload);
        expect(restored.requiresAck, original.requiresAck);
        expect(restored.retryCount, original.retryCount);
        expect(restored.expiresAt, original.expiresAt);
      });
    });

    group('copyWith', () {
      test('creates copy with updated messageId', () {
        final original = MessageEnvelope(
          messageId: 'original-id',
          timestamp: DateTime.utc(2024, 1, 15, 10, 30, 0),
          topic: '/server/user123/message',
          payload: {'key': 'value'},
        );

        final copy = original.copyWith(messageId: 'new-id');

        expect(copy.messageId, 'new-id');
        expect(copy.timestamp, original.timestamp);
        expect(copy.topic, original.topic);
        expect(copy.payload, original.payload);
      });

      test('creates copy with updated retryCount', () {
        final original = MessageEnvelope(
          messageId: 'test-id',
          timestamp: DateTime.utc(2024, 1, 15, 10, 30, 0),
          topic: '/server/user123/message',
          payload: {'key': 'value'},
          retryCount: 0,
        );

        final copy = original.copyWith(retryCount: 3);

        expect(copy.retryCount, 3);
        expect(copy.messageId, original.messageId);
      });
    });

    group('toString', () {
      test('returns readable representation', () {
        final envelope = MessageEnvelope(
          messageId: 'test-id',
          timestamp: DateTime.utc(2024, 1, 15, 10, 30, 0),
          topic: '/server/user123/message',
          payload: {'key': 'value'},
          requiresAck: true,
          retryCount: 2,
        );

        final str = envelope.toString();

        expect(str, contains('test-id'));
        expect(str, contains('/server/user123/message'));
        expect(str, contains('requiresAck: true'));
        expect(str, contains('retryCount: 2'));
      });
    });
  });
}