using GostCryptography.Asn1.Gost.Gost_28147_89;
using GostCryptography.Asn1.Gost.Gost_R3410_2001;
using GostCryptography.Asn1.Gost.Gost_R3410_2012_256;
using GostCryptography.Asn1.Gost.Gost_R3410_2012_512;
using GostCryptography.Asn1.Gost.Gost_R3410_94;
using GostCryptography.Base;
using GostCryptography.Gost_28147_89;
using GostCryptography.Gost_R3410;
using GostCryptography.Gost_R3411;
using GostCryptography.Native;
using GostCryptography.Xml;
using System;
using System.Collections.Generic;
using System.Security;
using System.Security.Cryptography;

namespace GostCryptography.Config
{
    /// <summary>
    /// Предоставляет методы для доступа к конфигурационной информации, используемой при работе с криптографическим провайдером ГОСТ
    /// </summary>
    public static class GostCryptoConfig
    {
        private static Lazy<ProviderType> _providerType_2001;
        private static Lazy<ProviderType> _providerType_2012_512;
        private static Lazy<ProviderType> _providerType_2012_1024;
        private static readonly Dictionary<string, Type> NameToType = new Dictionary<string, Type>(StringComparer.OrdinalIgnoreCase);
        private static readonly Dictionary<string, string> NameToOid = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);

        static GostCryptoConfig()
        {
            InitDefaultProviders();
            AddKnownAlgorithms();
            AddKnownOIDs();
        }

        [SecuritySafeCritical]
        private static void InitDefaultProviders()
        {
            _providerType_2001 = new Lazy<ProviderType>(CryptoApiHelper.GetAvailableProviderType_2001);
            _providerType_2012_512 = new Lazy<ProviderType>(CryptoApiHelper.GetAvailableProviderType_2012_512);
            _providerType_2012_1024 = new Lazy<ProviderType>(CryptoApiHelper.GetAvailableProviderType_2012_1024);
        }

        private static void AddKnownAlgorithms()
        {
            AddAlgorithm<Gost_R3410_2001_SignatureDescription>(Gost_R3410_2001_AsymmetricAlgorithm.KnownSignatureAlgorithmNames);
            AddAlgorithm<Gost_R3410_2012_256_SignatureDescription>(Gost_R3410_2012_256_AsymmetricAlgorithm.KnownSignatureAlgorithmNames);
            AddAlgorithm<Gost_R3410_2012_512_SignatureDescription>(Gost_R3410_2012_512_AsymmetricAlgorithm.KnownSignatureAlgorithmNames);

            AddAlgorithm<Gost_R3411_94_HashAlgorithm>(Gost_R3411_94_HashAlgorithm.KnownAlgorithmNames);
            AddAlgorithm<Gost_R3411_2012_256_HashAlgorithm>(Gost_R3411_2012_256_HashAlgorithm.KnownAlgorithmNames);
            AddAlgorithm<Gost_R3411_2012_512_HashAlgorithm>(Gost_R3411_2012_512_HashAlgorithm.KnownAlgorithmNames);
            AddAlgorithm<Gost_R3411_94_HMAC>(Gost_R3411_94_HMAC.KnownAlgorithmNames);
            AddAlgorithm<Gost_R3411_2012_256_HMAC>(Gost_R3411_2012_256_HMAC.KnownAlgorithmNames);
            AddAlgorithm<Gost_R3411_2012_512_HMAC>(Gost_R3411_2012_512_HMAC.KnownAlgorithmNames);
            AddAlgorithm<Gost_R3411_94_PRF>(Gost_R3411_94_PRF.KnownAlgorithmNames);
            AddAlgorithm<Gost_R3411_2012_256_PRF>(Gost_R3411_2012_256_PRF.KnownAlgorithmNames);
            AddAlgorithm<Gost_R3411_2012_512_PRF>(Gost_R3411_2012_512_PRF.KnownAlgorithmNames);

            AddAlgorithm<Gost_28147_89_SymmetricAlgorithm>(Gost_28147_89_SymmetricAlgorithm.KnownAlgorithmNames);
            AddAlgorithm<Gost_28147_89_ImitHashAlgorithm>(Gost_28147_89_ImitHashAlgorithm.KnownAlgorithmNames);

            AddAlgorithm<Gost_R3410_2001_AsymmetricAlgorithm>();
            AddAlgorithm<Gost_R3410_2012_256_AsymmetricAlgorithm>();
            AddAlgorithm<Gost_R3410_2012_512_AsymmetricAlgorithm>();

            AddAlgorithm<GostSignatureFormatter>();
            AddAlgorithm<GostSignatureDeformatter>();

            AddAlgorithm<Gost_R3410_2001_KeyValue>(Gost_R3410_2001_KeyValue.KnownValueUrls);
            AddAlgorithm<Gost_R3410_2012_256_KeyValue>(Gost_R3410_2012_256_KeyValue.KnownValueUrls);
            AddAlgorithm<Gost_R3410_2012_512_KeyValue>(Gost_R3410_2012_512_KeyValue.KnownValueUrls);
        }

        private static void AddKnownOIDs()
        {
            AddOID<Gost_R3410_2001_AsymmetricAlgorithm>(Gost_R3410_2001_Constants.KeyAlgorithm.Value);
            AddOID<Gost_R3410_2012_256_AsymmetricAlgorithm>(Gost_R3410_2012_256_Constants.KeyAlgorithm.Value);
            AddOID<Gost_R3410_2012_512_AsymmetricAlgorithm>(Gost_R3410_2012_512_Constants.KeyAlgorithm.Value);

            AddOID<Gost_R3411_94_HashAlgorithm>(Gost_R3410_94_Constants.HashAlgorithm.Value, Gost_R3411_94_HashAlgorithm.KnownAlgorithmNames);
            AddOID<Gost_R3411_2012_256_HashAlgorithm>(Gost_R3410_2012_256_Constants.HashAlgorithm.Value, Gost_R3411_2012_256_HashAlgorithm.KnownAlgorithmNames);
            AddOID<Gost_R3411_2012_512_HashAlgorithm>(Gost_R3410_2012_512_Constants.HashAlgorithm.Value, Gost_R3411_2012_512_HashAlgorithm.KnownAlgorithmNames);

            AddOID<Gost_28147_89_SymmetricAlgorithm>(Gost_28147_89_Constants.EncryptAlgorithm.Value, Gost_28147_89_SymmetricAlgorithm.KnownAlgorithmNames);
        }


        /// <summary>
        /// Инициализирует конфигурацию
        /// </summary>
        public static void Initialize()
        {
            // На самом деле инициализация происходит в статическом конструкторе
        }

        /// <summary>
        /// Возвращает или устанавливает провайдер по умолчанию для ключей ГОСТ Р 34.10-2001
        /// </summary>
        public static ProviderType ProviderType
        {
            get => _providerType_2001.Value;
            set => _providerType_2001 = new Lazy<ProviderType>(() => value);
        }

        /// <summary>
        /// Возвращает или устанавливает провайдер по умолчанию для ключей ГОСТ Р 34.10-2012/512
        /// </summary>
        public static ProviderType ProviderType_2012_512
        {
            get => _providerType_2012_512.Value;
            set => _providerType_2012_512 = new Lazy<ProviderType>(() => value);
        }

        /// <summary>
        /// Возвращает или устанавливает провайдер по умолчанию для ключей ГОСТ Р 34.10-2012/1024
        /// </summary>
        public static ProviderType ProviderType_2012_1024
        {
            get => _providerType_2012_1024.Value;
            set => _providerType_2012_1024 = new Lazy<ProviderType>(() => value);
        }

        /// <summary>
        /// Добавляет связь между алгоритмом и именем
        /// </summary>
        [SecuritySafeCritical]
        public static void AddAlgorithm<T>(params string[] names)
        {
            var type = typeof(T);

            if (names != null)
            {
                foreach (var name in names)
                {
                    NameToType.Add(name, type);
                    CryptoConfig.AddAlgorithm(type, name);
                }
            }

            NameToType.Add(type.Name, type);
            CryptoConfig.AddAlgorithm(type, type.Name);

            if (type.FullName != null)
            {
                NameToType.Add(type.FullName, type);
                CryptoConfig.AddAlgorithm(type, type.FullName);
            }

            if (type.AssemblyQualifiedName != null)
            {
                NameToType.Add(type.AssemblyQualifiedName, type);
                CryptoConfig.AddAlgorithm(type, type.AssemblyQualifiedName);
            }
        }

        /// <summary>
        /// Добавляет связь между алгоритмом и OID
        /// </summary>
        [SecuritySafeCritical]
        public static void AddOID<T>(string oid, params string[] names)
        {
            var type = typeof(T);

            if (names != null)
            {
                foreach (var name in names)
                {
                    NameToOid.Add(name, oid);
                    CryptoConfig.AddOID(oid, name);
                }
            }

            NameToOid.Add(type.Name, oid);
            CryptoConfig.AddOID(oid, type.Name);

            if (type.FullName != null)
            {
                NameToOid.Add(type.FullName, oid);
                CryptoConfig.AddOID(oid, type.FullName);
            }

            if (type.AssemblyQualifiedName != null)
            {
                NameToOid.Add(type.AssemblyQualifiedName, oid);
                CryptoConfig.AddOID(oid, type.AssemblyQualifiedName);
            }
        }

        /// <inheritdoc cref="CryptoConfig.MapNameToOID"/>
        public static string MapNameToOID(string name)
        {
            string oid = null;

            if (!string.IsNullOrEmpty(name))
            {
                oid = CryptoConfig.MapNameToOID(name);

                if (string.IsNullOrEmpty(oid))
                {
                    NameToOid.TryGetValue(name, out oid);
                }
            }

            return oid;
        }

        /// <inheritdoc cref="CryptoConfig.CreateFromName(string,object[])"/>
        public static object CreateFromName(string name, params object[] arguments)
        {
            object obj = null;

            if (!string.IsNullOrEmpty(name))
            {
                obj = CryptoConfig.CreateFromName(name, arguments);

                if (obj == null && NameToType.TryGetValue(name, out var objType))
                {
                    obj = Activator.CreateInstance(objType, arguments);
                }
            }

            return obj;
        }
    }
}