// /**
//  * File: SessionManager.cs
//  * Author: haraldwolff
//  *
//  * This file and it's content is copyrighted by the Author and / or copyright holder.
//  * Any use wihtout proper permission is illegal and may lead to legal actions.
//  *
//  *
//  **/
using System;
using System.Collections.Generic;
using ln.types.net;
using ln.types.btree;
using ln.radius;
using System.Net;
using ln.logging;
using ln.types.odb;
using ln.types.odb.mapped;
using skyspot.radius;
using System.Text;
using skyspot.hotspot;
namespace skyspot.session
{
    public class SessionManager
    {
        public HotspotManager HotspotManager { get; }
        public RadiusSecretsStore SecretsStore => HotspotManager.SecretsStore;


        RadiusServer accountingRadius;
        RadiusServer locatorRadius;

        public SessionManager(HotspotManager hotspotManager)
        {
            HotspotManager = hotspotManager;
            InitializeRadius();
        }

        public void Start()
        {
        }


        private void InitializeRadius()
        {
            accountingRadius= new RadiusServer(new IPEndPoint(IPAddress.Any,1812));
            locatorRadius = new RadiusServer(new IPEndPoint(IPAddress.Any, 1816));

            accountingRadius.LookupSecret = (endPoint) => SecretsStore.LookupSecret(endPoint);
            locatorRadius.LookupSecret = (endPoint) => SecretsStore.LookupSecret(endPoint);

            locatorRadius.MessageReceived = LocatorMessageReceived;
            accountingRadius.MessageReceived = AccountingMessageReceived;
        }




        /**
         * Locator Service
         * 
         **/
        void LocatorMessageReceived(RadiusServer radiusServer, RadiusMessage radiusMessage)
        {
            Logging.Log(LogLevel.INFO, "Radius Message received: {0}", radiusMessage);
            switch (radiusMessage.Code)
            {
                case RadiusCode.AccessRequest:
                    LocatorAccessRequest(radiusServer, radiusMessage);
                    break;
            }
        }

        void LocatorAccessRequest(RadiusServer radiusServer, RadiusMessage radiusMessage)
        {

        }

        /**
         * 
         * Accounting Service
         * 
         **/
        void AccountingMessageReceived(RadiusServer radiusServer, RadiusMessage radiusMessage)
        {
            Logging.Log(LogLevel.INFO, "Radius Message received: {0}", radiusMessage);
            switch (radiusMessage.Code)
            {
                case RadiusCode.AccessRequest:
                    AccountingAccessRequest(radiusServer, radiusMessage);
                    break;
            }
        }

        void AccountingAccessRequest(RadiusServer radiusServer, RadiusMessage radiusMessage)
        {
            RadiusAttribute.UserName userName = radiusMessage.GetAttribute<RadiusAttribute.UserName>();
            RadiusAttribute.UserPassword userPassword = radiusMessage.GetAttribute<RadiusAttribute.UserPassword>();
            RadiusAttribute.CalledStationID calledStationID = radiusMessage.GetAttribute<RadiusAttribute.CalledStationID>();

            if ((userName == null) || (calledStationID == null))
            {
                Logging.Log(LogLevel.WARNING, "InvalidRequest: UserName={0} CalledStationID={1}",userName,calledStationID);
                return;
            }

            MAC clientMac = new MAC(userName.AsText);
            String networkName = calledStationID.AsText;

            HotspotNetworkRuntime hotspotNetworkRuntime = HotspotManager.GetHotspotNetworkRuntime(networkName);
            ClientSession clientSession = hotspotNetworkRuntime.GetSession(clientMac);

            if (clientSession.CurrentProfile == null)
                clientSession.CurrentProfile = hotspotNetworkRuntime.HotspotNetwork.DefaultClientProfile;

            Logging.Log(LogLevel.INFO, "Accounting: Session start for client {0} on Network {1}",clientMac, networkName);

            RadiusMessage reply = radiusMessage.ConstructReply(RadiusCode.AccessAccept);
            reply.AddAttribute(new RadiusAttribute.FramedIPAddress().SetIP(IPv4.Parse("10.123.0.4")));
            if (clientSession.CurrentProfile != null)
                reply.AddAttribute(new RadiusAttribute.FilterID().SetText(clientSession.CurrentProfile.Name));

            radiusServer.Send(reply);
        }    

    }
}