using DigitalData.Core.Security.Cryptographer;

namespace DigitalData.Core.Security.Config
{
    public class AsymCryptParams : RSAFactoryParams
    {
        public string PemDirectory { get; init; } = string.Empty;

        public string Separator { get; init; } = "_-_";

        public IEnumerable<RSADecryptor> Decryptors { get; init; } = new List<RSADecryptor>();

        /// <summary>
        /// 0: Issuer - 1: Audience - 2: Secret version (if is encrypted)
        /// </summary>
        private string CreateFileName(params object[] objs) => string.Join(Separator, objs);

        private string CreatePem(bool isEncrypted) => isEncrypted
            ? Instance.RSAFactory.CreateEncryptedPrivateKeyPem(pbeParameters: PbeParameters, keySizeInBits: KeySizeInBits, password: Secrets.PBE_PASSWORD)
            : Instance.RSAFactory.CreatePrivateKeyPem(keySizeInBits: KeySizeInBits);

        public override void OnDeserialized()
        {
            base.OnDeserialized();

            // Create root folder if it does not exist
            if (!Directory.Exists(PemDirectory))
                Directory.CreateDirectory(PemDirectory);

            foreach (var crypt in Decryptors)
            {
                // set default path
                if (crypt.IsPemNull)
                {
                    var file_name_params = new List<object> { crypt.Issuer, crypt.Audience };
                    if (crypt.Encrypt)
                        file_name_params.Add(Secrets.Version);

                    var file_name = CreateFileName(file_name_params);
                    var path = Path.Combine(PemDirectory, file_name);

                    if (File.Exists(path))
                        crypt.SetPem(File.ReadAllText(path));
                    else
                    {
                        var pem = CreatePem(crypt.Encrypt);
                        crypt.SetPem(File.ReadAllText(pem));
                        Task.Run(async () => await File.WriteAllTextAsync(path: path, pem));
                    }
                }

                crypt.Init();
            }
        }
    }
}