private FeatureTelemetry ParseFeatureTelemetry()

in src/Microsoft.Extensions.Configuration.AzureAppConfiguration/FeatureManagement/FeatureManagementKeyValueAdapter.cs [1202:1288]
75 lines of code
21 McCabe index (conditional complexity)

        private FeatureTelemetry ParseFeatureTelemetry(ref Utf8JsonReader reader, string settingKey)
        {
            var featureTelemetry = new FeatureTelemetry();

            while (reader.Read() && reader.TokenType != JsonTokenType.EndObject)
            {
                if (reader.TokenType != JsonTokenType.PropertyName)
                {
                    continue;
                }

                string telemetryPropertyName = reader.GetString();

                switch (telemetryPropertyName)
                {
                    case FeatureManagementConstants.Enabled:
                        {
                            if (reader.Read() && (reader.TokenType == JsonTokenType.False || reader.TokenType == JsonTokenType.True))
                            {
                                featureTelemetry.Enabled = reader.GetBoolean();
                            }
                            else if (reader.TokenType == JsonTokenType.String && bool.TryParse(reader.GetString(), out bool enabled))
                            {
                                featureTelemetry.Enabled = enabled;
                            }
                            else if (reader.TokenType != JsonTokenType.Null)
                            {
                                throw CreateFeatureFlagFormatException(
                                    FeatureManagementConstants.Enabled,
                                    settingKey,
                                    reader.TokenType.ToString(),
                                    $"{JsonTokenType.True}' or '{JsonTokenType.False}");
                            }

                            break;
                        }

                    case FeatureManagementConstants.Metadata:
                        {
                            if (reader.Read() && reader.TokenType == JsonTokenType.StartObject)
                            {
                                featureTelemetry.Metadata = new Dictionary<string, string>();

                                while (reader.Read() && reader.TokenType != JsonTokenType.EndObject)
                                {
                                    if (reader.TokenType != JsonTokenType.PropertyName)
                                    {
                                        continue;
                                    }

                                    string metadataPropertyName = reader.GetString();

                                    if (reader.Read() && reader.TokenType == JsonTokenType.String)
                                    {
                                        featureTelemetry.Metadata[metadataPropertyName] = reader.GetString();
                                    }
                                    else if (reader.TokenType != JsonTokenType.Null)
                                    {
                                        throw CreateFeatureFlagFormatException(
                                            metadataPropertyName,
                                            settingKey,
                                            reader.TokenType.ToString(),
                                            JsonTokenType.String.ToString());
                                    }
                                }
                            }
                            else if (reader.TokenType != JsonTokenType.Null)
                            {
                                throw CreateFeatureFlagFormatException(
                                    FeatureManagementConstants.Metadata,
                                    settingKey,
                                    reader.TokenType.ToString(),
                                    JsonTokenType.StartObject.ToString());
                            }

                            break;
                        }

                    default:
                        reader.Skip();

                        break;
                }
            }

            return featureTelemetry;
        }