using System;
using System.Runtime.InteropServices;

namespace SARD
{
    public static class SardIntegration
    {
        private const string DLL = "armour";

        [DllImport(DLL, EntryPoint = "sardInitialize",
            CallingConvention = CallingConvention.Cdecl,
            CharSet = CharSet.Unicode)]
        public static extern int SardInitialize(string armourPath, string sessionId);

        [DllImport(DLL, EntryPoint = "sardFinalize",
            CallingConvention = CallingConvention.Cdecl)]
        public static extern void SardFinalize();

        [DllImport(DLL, EntryPoint = "sardSetUserWID",
            CallingConvention = CallingConvention.Cdecl,
            CharSet = CharSet.Unicode)]
        public static extern void SardSetUserId(string userId);

        [DllImport(DLL, EntryPoint = "sardSetSessionWID",
            CallingConvention = CallingConvention.Cdecl,
            CharSet = CharSet.Unicode)]
        public static extern void SardSetSessionId(string sessionId);

        [DllImport(DLL, EntryPoint = "sardReloginW",
            CallingConvention = CallingConvention.Cdecl,
            CharSet = CharSet.Unicode)]
        public static extern void SardRelogin(string userId, string sessionId);

        [DllImport(DLL, EntryPoint = "sardGetSecureSessionID",
            CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr SardGetSecureSessionIdNative();

        public static string GetSecureSessionId()
        {
            var ptr = SardGetSecureSessionIdNative();
            return ptr == IntPtr.Zero ? null : Marshal.PtrToStringUni(ptr);
        }
    }
}