using DigitalData.Core.Abstractions.Security;
using System.Reflection;
using System.Security.Cryptography;

namespace DigitalData.Core.Security.RSAKey
{
    public class RSADecryptor : RSAPrivateKey, IAsymmetricDecryptor
    {
        public RSAEncryptionPadding Padding { get; init; } = RSAEncryptionPadding.OaepSHA256;

        // TODO: add as json converter to IConfigurIConfiguration.Config
        public string PaddingName
        {
            get => Padding.ToString();
            init => Padding = typeof(RSAEncryptionPadding).GetProperty(value, BindingFlags.Public | BindingFlags.Static)?.GetValue(null) as RSAEncryptionPadding ?? throw new ArgumentException($"Padding '{value}' not found.");
        }

        public byte[] Decrypt(byte[] data) => RSA.Decrypt(data, Padding);

        private readonly Lazy<IAsymmetricEncryptor> _lazyEncryptor;

        public IAsymmetricEncryptor Encryptor => _lazyEncryptor.Value;

        public RSADecryptor()
        {
            _lazyEncryptor = new(() => new RSAEncryptor()
            {
                Content = RSA.ExportRSAPublicKeyPem(),
                Padding = Padding
            });
        }
    }
}