void Main()
{
    var outputPath = $@"./bitwarden_import/bitwarden_importdata{DateTime.Now.ToString("yyyyMMdd_HHmmss")}.json";
    var teamsidPersonalCsv = @"./teamsid_export/indivisual_records_2019-01-12 20_08_36.csv";
    var teamsidOrganizationCsv = @"./teamsid_export/Organization_records_2019-01-12 21_20_10.csv";
    var teamsidCsvs = new[] { teamsidPersonalCsv, teamsidOrganizationCsv };
    var bitwardenFolderDefinitionJson = @"./bitwarden_export/bitwarden_export_folder_definition.json";

    // deserialize folder definitions
    BitwardenFolderDefinition DeserializeFolderJson(string path)
    {
        using (var stream = File.OpenRead(path))
        {
            var folders = Utf8Json.JsonSerializer.Deserialize<BitwardenFolderDefinition>(stream);
            return folders;
        }
    }
    var folderDefinition = DeserializeFolderJson(bitwardenFolderDefinitionJson);

    // convert teamsid to bitwarden
    var combinedResult = teamsidCsvs.SelectMany(json =>
    {
        var parser = new CsvParser(json);
        var teamsIdDatas = parser.Parse<TeamsId>();
        var bitwardenItems = new BitwardenConverter().Convert(teamsIdDatas, folderDefinition, "Socials");
        return bitwardenItems;
    })
    .ToArray();

    combinedResult.Dump();
    // serialize bitwarden import data
    var importData = new BitwardenDefinition
    {
        folders = folderDefinition.folders,
        items = combinedResult,
    };
    var jsonBytes = Utf8Json.JsonSerializer.Serialize<BitwardenDefinition>(importData);

    // output json
    File.WriteAllBytes(outputPath, jsonBytes);
}

public class BitwardenConverter
{
    private class FieldRecord
    {
        public string Url { get; set; }
        public string Email { get; set; }
        public string UserName { get; set; }
        public string Password { get; set; }
        public (string key, string value)[] SecureFields { get; set; }
        public (string key, string value)[] Fields { get; set; }
        public string Group { get; set; }
    }

    public BitwardenItem[] Convert(TeamsId[] from, BitwardenFolderDefinition folderDefinition, string defaultGroup = null)
    {
        var records = from
        .Select(record =>
        {
            // reflection to check fieldXX and get valueXX
            var t = record.GetType();
            var props = t.GetProperties(BindingFlags.Public | BindingFlags.Instance);
            var description = GetPropertyValue(record, t, "description");
            var note = GetPropertyValue(record, t, "note");
            var fieldRecord = ParseFieldRecord(props, t, record, defaultGroup);

            // generate typed item
            var bitwarden = new BitwardenItem
            {
                id = Guid.NewGuid().ToString(),
                organizationId = null,
                collectionIds = null,
                type = 1,
                name = description,
                login = new BitwardenLogin
                {
                    username = fieldRecord.UserName,
                    password = fieldRecord.Password,
                    uris = new[] {
                        new BitwardenUri
                        {
                            uri = fieldRecord.Url,
                            match = null,
                        }
                    }
                },
                favorite = false,
                notes = note,
                folderId = folderDefinition.GetId(fieldRecord.Group),
            };
            // initialize fields
            var customField = fieldRecord.Fields == null
                ? Array.Empty<BitwardenField>()
                : fieldRecord.Fields.Select(x => new BitwardenField { name = x.key, value = x.value, type = 0 });
            var customSecretField = fieldRecord.SecureFields == null
                ? Array.Empty<BitwardenField>()
                : fieldRecord.SecureFields.Select(x => new BitwardenField { name = x.key, value = x.value, type = 1 });
            var fields = customField.Concat(customSecretField).ToArray();
            if (fields.Any())
            {
                bitwarden.fields = fields;
            }
            return bitwarden;
        })
        .ToArray();
        return records;
    }

    private FieldRecord ParseFieldRecord(PropertyInfo[] props, Type t, TeamsId source, string defaultGroup = null)
    {
        var fieldRecord = new FieldRecord();
        // get FieldXX properties via reflection
        var fieldRecords = props
            .Where(x => Match(x.Name, @"Field\d+"))
            .Where(x => GetPropertyValue(source, t, x.Name) != "")
            .Select(x => (key: GetPropertyValue(source, t, x.Name), value: GetPropertyValue(source, t, x.Name.Replace("Field", "Value"))))
            .ToArray();

        // get field's value and categolize each via field name regex pattern
        var secureMemoList = new List<(string, string)>();
        var memoList = new List<(string, string)>();
        foreach (var record in fieldRecords)
        {
            switch (record.key)
            {
                case var _ when Match(record.key, "url") && fieldRecord.Url == null:
                    fieldRecord.Url = record.value;
                    break;
                case var _ when Match(record.key, "email|e-mail") && fieldRecord.Email == null:
                    fieldRecord.Email = record.value;
                    break;
                case var _ when Match(record.key, "username") && fieldRecord.UserName == null:
                    fieldRecord.UserName = record.value;
                    break;
                case var _ when Match(record.key, "password") && fieldRecord.Password == null:
                    fieldRecord.Password = record.value;
                    break;
                case var _ when Match(record.key, "pass|access|secret|pin|token|enctypt"):
                    secureMemoList.Add((record.key, record.value));
                    break;
                case var _ when Match(record.key, "group"):
                    fieldRecord.Group = record.value;
                    break;
                default:
                    memoList.Add((record.key, record.value));
                    break;
            }
        }
        // group fallback
        if (defaultGroup != null && string.IsNullOrWhiteSpace(fieldRecord.Group))
        {
            fieldRecord.Group = defaultGroup;
        }
        fieldRecord.Fields = memoList.ToArray();
        fieldRecord.SecureFields = secureMemoList.ToArray();
        return fieldRecord;
    }

    private bool Match(string text, string pattern)
    {
        return Regex.IsMatch(text, pattern, RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
    }

    private string GetPropertyValue(TeamsId record, Type t, string propertyField)
    {
        return (string)t.GetProperty(propertyField).GetValue(record);
    }
}

public class CsvParser
{
    private readonly string path;

    public CsvParser(string path)
    {
        this.path = path;
    }

    public T[] Parse<T>() where T : class
    {
        using (var reader = new StreamReader(path))
        using (var csv = new CsvReader(reader))
        {
            csv.Configuration.MissingFieldFound = null;
            var records = csv.GetRecords<T>();
            return records.ToArray();
        }
    }
}

public class BitwardenDefinition
{
    public BitwardenFolder[] folders { get; set; }
    public BitwardenItem[] items {get;set;}
}

public class BitwardenItem
{
    public string id { get; set; }
    public string organizationId { get; set; }
    public string collectionIds { get; set; }
    public bool favorite { get; set; }
    public string folderId { get; set; }
    // login = 1, card = 3
    public int type { get; set; }
    public string name { get; set; }
    public string notes { get; set; }
    public BitwardenField[] fields { get; set; }
    public BitwardenLogin login { get; set; }
}

public class BitwardenLogin
{
    public BitwardenUri[] uris { get; set; }
    public string username { get; set; }
    public string password { get; set; }
    // authenticator = null (premium only)
    public string totp { get; set; }
}

public class BitwardenUri
{
    // default = null
    public object match { get; set; }
    public string uri { get; set; }
}

public class BitwardenField
{
    public string name { get; set; }
    public string value { get; set; }
    // custom = 0, hidden = 1, boolean = 2
    public int type { get; set; }
}

public class BitwardenFolderDefinition
{
    public BitwardenFolder[] folders { get; set; }

    private static readonly string defaultIdName = "Social";
    public string GetId(string name)
    {
        if (folders == null || !folders.Any()) return defaultIdName;
        return folders.FirstOrDefault(x => x.name == name)?.id ?? defaultIdName;
    }
}

public class BitwardenFolder
{
    public string id { get; set; }
    public string name { get; set; }
}

public class TeamsId
{
    public string description { get; set; }
    public string note { get; set; }
    public string Field0 { get; set; }
    public string Type0 { get; set; }
    public string Value0 { get; set; }
    public string Field1 { get; set; }
    public string Type1 { get; set; }
    public string Value1 { get; set; }
    public string Field2 { get; set; }
    public string Type2 { get; set; }
    public string Value2 { get; set; }
    public string Field3 { get; set; }
    public string Type3 { get; set; }
    public string Value3 { get; set; }
    public string Field4 { get; set; }
    public string Type4 { get; set; }
    public string Value4 { get; set; }
    public string Field5 { get; set; }
    public string Type5 { get; set; }
    public string Value5 { get; set; }
    public string Field6 { get; set; }
    public string Type6 { get; set; }
    public string Value6 { get; set; }
    public string Field7 { get; set; }
    public string Type7 { get; set; }
    public string Value7 { get; set; }
    public string Field8 { get; set; }
    public string Type8 { get; set; }
    public string Value8 { get; set; }
    public string Field9 { get; set; }
    public string Type9 { get; set; }
    public string Value9 { get; set; }
    public string Field10 { get; set; }
    public string Type10 { get; set; }
    public string Value10 { get; set; }
    public string Field11 { get; set; }
    public string Type11 { get; set; }
    public string Value11 { get; set; }
    public string Field12 { get; set; }
    public string Type12 { get; set; }
    public string Value12 { get; set; }
}