/*
 *  IsoConnectionParameters.cs
 *
 *  Copyright 2014 Michael Zillgith
 *
 *  This file is part of libIEC61850.
 *
 *  libIEC61850 is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  libIEC61850 is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with libIEC61850.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  See COPYING file for the complete license text.
 */

using System;
using System.Runtime.InteropServices;

namespace IEC61850
{
	namespace Client
	{

		public enum AcseAuthenticationMechanism {
			ACSE_AUTH_NONE = 0,
    		ACSE_AUTH_PASSWORD = 1
		}

		public class IsoConnectionParameters
		{
			[DllImport("iec61850", CallingConvention = CallingConvention.Cdecl)]
			private static extern void IsoConnectionParameters_destroy(IntPtr self);

			[DllImport("iec61850", CallingConvention = CallingConvention.Cdecl)]
			private static extern void IsoConnectionParameters_setRemoteApTitle(IntPtr self, string apTitle, int aeQualifier);

			[DllImport("iec61850", CallingConvention = CallingConvention.Cdecl)]
			private static extern void IsoConnectionParameters_setRemoteAddresses(IntPtr self, UInt32 pSelector, UInt16 sSelector, UInt16 tSelector);

			[DllImport("iec61850", CallingConvention = CallingConvention.Cdecl)]
			private static extern void IsoConnectionParameters_setLocalApTitle(IntPtr self, string apTitle, int aeQualifier);

			[DllImport("iec61850", CallingConvention = CallingConvention.Cdecl)]
			private static extern void IsoConnectionParameters_setLocalAddresses(IntPtr self, UInt32 pSelector, UInt16 sSelector, UInt16 tSelector);

			[DllImport("iec61850", CallingConvention = CallingConvention.Cdecl)]
			private static extern void IsoConnectionParameters_setAcseAuthenticationParameter(IntPtr self, IntPtr acseAuthParameter);

			[DllImport("iec61850", CallingConvention = CallingConvention.Cdecl)]
			private static extern IntPtr AcseAuthenticationParameter_create();

			[DllImport("iec61850", CallingConvention = CallingConvention.Cdecl)]
			private static extern void AcseAuthenticationParameter_destroy(IntPtr self);

			[DllImport("iec61850", CallingConvention = CallingConvention.Cdecl)]
			private static extern void AcseAuthenticationParameter_setAuthMechanism(IntPtr self, int mechanism);

			[DllImport("iec61850", CallingConvention = CallingConvention.Cdecl)]
			private static extern void AcseAuthenticationParameter_setPassword(IntPtr self, string password);

			private IntPtr self;

			private IntPtr authParameter = IntPtr.Zero;

			internal IsoConnectionParameters (IntPtr self)
			{
				this.self = self;
			}

			~IsoConnectionParameters ()
			{	
				if (authParameter != IntPtr.Zero)
					AcseAuthenticationParameter_destroy(authParameter);

				IsoConnectionParameters_destroy(self);
			}

			public void SetRemoteApTitle(string apTitle, int aeQualifier)
			{
				IsoConnectionParameters_setRemoteApTitle(self, apTitle, aeQualifier);
			}

			public void SetRemoteAddresses (UInt32 pSelector, UInt16 sSelector, UInt16 tSelector)
			{
				IsoConnectionParameters_setRemoteAddresses(self, pSelector, sSelector, tSelector);
			}

			public void SetLocalApTitle (string apTitle, int aeQualifier)
			{
				IsoConnectionParameters_setLocalApTitle(self, apTitle, aeQualifier);
			}

			public void SetLocalAddresses (UInt32 pSelector, UInt16 sSelector, UInt16 tSelector)
			{
				IsoConnectionParameters_setLocalAddresses(self, pSelector, sSelector, tSelector);
			}

			public void UsePasswordAuthentication (string password)
			{
				if (authParameter == IntPtr.Zero) {
					authParameter = AcseAuthenticationParameter_create ();
					AcseAuthenticationParameter_setAuthMechanism (authParameter, (int)AcseAuthenticationMechanism.ACSE_AUTH_PASSWORD);
					AcseAuthenticationParameter_setPassword (authParameter, password);
					IsoConnectionParameters_setAcseAuthenticationParameter(self, authParameter);
				}
				else
					throw new IedConnectionException("Authentication parameter already set");
			}
		}

	}
}