using System;
using System.Runtime.InteropServices;

namespace Alkami.Ops.Common.NativeMethods
{
    internal static class SafeNativeMethods
    {
        #region CRYPT32 - Certificates and Store Management

        /// <summary>
        /// This struct is used when working with PFX files
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        internal struct CRYPT_DATA_BLOB
        {
            public int cbData;
            public IntPtr pbData;
        }

        [DllImport("CRYPT32", SetLastError = true)]
        internal static extern Boolean PFXExportCertStoreEx(
            IntPtr hCertStore,
            ref CRYPT_DATA_BLOB pPFX,
            [MarshalAs(UnmanagedType.LPWStr)] String szPassword,
            IntPtr pvReserved,
            uint dwFlags
            );

        internal const uint EXPORT_PRIVATE_KEYS = 0x0004;

        [DllImport("CRYPT32")]
        internal static extern bool PFXIsPFXBlob(ref CRYPT_DATA_BLOB pPfx);

        [DllImport("CRYPT32", SetLastError = true)]
        internal static extern Boolean CertAddCertificateContextToStore(IntPtr hCertStore, IntPtr pCertContext, Int32 dwAddDisposition, ref IntPtr ppStoreContext);

        [DllImport("CRYPT32", EntryPoint = "CertAddEncodedCertificateToStore", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool CertAddEncodedCertificateToStore(IntPtr certStore, int certEncodingType, byte[] certEncoded, int certEncodedLength, int addDisposition, IntPtr certContext);

        [DllImport("CRYPT32", EntryPoint = "CertCloseStore", CharSet = CharSet.Unicode, SetLastError = true)]
        internal static extern bool CertCloseStore(IntPtr storeProvider, int flags);

        [DllImport("CRYPT32", EntryPoint = "CertEnumCertificatesInStore", CharSet = CharSet.Unicode, SetLastError = true)]
        internal static extern IntPtr CertEnumCertificatesInStore(IntPtr storeProvider, IntPtr prevCertContext);

        [DllImport("CRYPT32", EntryPoint = "CertOpenStore", CharSet = CharSet.Unicode, SetLastError = true)]
        internal static extern IntPtr CertOpenStore(int storeProvider, int encodingType, int hcryptProv, int flags, string pvPara);

        [DllImport("CRYPT32", SetLastError = true)]
        internal static extern IntPtr PFXImportCertStore(ref CRYPT_DATA_BLOB pPfx, [MarshalAs(UnmanagedType.LPWStr)] String szPassword, uint dwFlags);

        #endregion CRYPT32 - Certificates and Store Management
    }
}