using GostCryptography.Properties;
using System.Collections;
using System.Reflection;
using System.Security.Cryptography.X509Certificates;
using System.Security.Cryptography.Xml;

namespace GostCryptography.Reflection
{
    static class SignedXmlHelper
    {
        public static IEnumerator GetKeyInfoEnumerable(this SignedXml signedXml)
        {
            return (IEnumerator)KeyInfoEnumerableField.GetValue(signedXml);
        }

        public static void SetKeyInfoEnumerable(this SignedXml signedXml, IEnumerator keyInfoEnumerable)
        {
            KeyInfoEnumerableField.SetValue(signedXml, keyInfoEnumerable);
        }

        private static volatile FieldInfo _keyInfoEnumerableField;
        private static readonly object KeyInfoEnumerableFieldSync = new object();

        private static FieldInfo KeyInfoEnumerableField
        {
            get
            {
                if (_keyInfoEnumerableField == null)
                {
                    lock (KeyInfoEnumerableFieldSync)
                    {
                        if (_keyInfoEnumerableField == null)
                        {
                            _keyInfoEnumerableField = typeof(SignedXml).GetField("m_keyInfoEnum", BindingFlags.Instance | BindingFlags.NonPublic);
                        }
                    }
                }

                if (_keyInfoEnumerableField == null)
                {
                    throw ExceptionUtility.CryptographicException(Resources.XmlCannotFindPrivateMember, "m_keyInfoEnum");
                }

                return _keyInfoEnumerableField;
            }
        }

        public static IEnumerator GetX509Enumerable(this SignedXml signedXml)
        {
            return (IEnumerator)X509EnumerableField.GetValue(signedXml);
        }

        public static void SetX509Enumerable(this SignedXml signedXml, IEnumerator x509Enumerable)
        {
            X509EnumerableField.SetValue(signedXml, x509Enumerable);
        }

        private static volatile FieldInfo _x509EnumerableField;
        private static readonly object X509EnumerableSync = new object();

        private static FieldInfo X509EnumerableField
        {
            get
            {
                if (_x509EnumerableField == null)
                {
                    lock (X509EnumerableSync)
                    {
                        if (_x509EnumerableField == null)
                        {
                            _x509EnumerableField = typeof(SignedXml).GetField("m_x509Enum", BindingFlags.Instance | BindingFlags.NonPublic);
                        }
                    }
                }

                if (_x509EnumerableField == null)
                {
                    throw ExceptionUtility.CryptographicException(Resources.XmlCannotFindPrivateMember, "m_x509Enum");
                }

                return _x509EnumerableField;
            }
        }

        public static X509Certificate2Collection GetX509Collection(this SignedXml signedXml)
        {
            return (X509Certificate2Collection)X509CollectionField.GetValue(signedXml);
        }

        public static void SetX509Collection(this SignedXml signedXml, X509Certificate2Collection x509Collection)
        {
            X509CollectionField.SetValue(signedXml, x509Collection);
        }

        private static volatile FieldInfo _x509CollectionField;
        private static readonly object X509CollectionFieldSync = new object();

        private static FieldInfo X509CollectionField
        {
            get
            {
                if (_x509CollectionField == null)
                {
                    lock (X509CollectionFieldSync)
                    {
                        if (_x509CollectionField == null)
                        {
                            _x509CollectionField = typeof(SignedXml).GetField("m_x509Collection", BindingFlags.Instance | BindingFlags.NonPublic);
                        }
                    }
                }

                if (_keyInfoEnumerableField == null)
                {
                    throw ExceptionUtility.CryptographicException(Resources.XmlCannotFindPrivateMember, "m_x509Collection");
                }

                return _x509CollectionField;
            }
        }
    }
}