first commit

NitroxClient/Communication/MultiplayerSession/ConnectionState/Disconnected.cs

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+using System;
+using System.Threading.Tasks;
+using NitroxClient.Communication.Abstract;
+using NitroxClient.Communication.Exceptions;
+using NitroxModel.Helper;
+using NitroxModel.Packets;
+
+namespace NitroxClient.Communication.MultiplayerSession.ConnectionState
+{
+    public class Disconnected : IMultiplayerSessionConnectionState
+    {
+        public MultiplayerSessionConnectionStage CurrentStage => MultiplayerSessionConnectionStage.DISCONNECTED;
+
+        public async Task NegotiateReservationAsync(IMultiplayerSessionConnectionContext sessionConnectionContext)
+        {
+            ValidateState(sessionConnectionContext);
+
+            IClient client = sessionConnectionContext.Client;
+            string ipAddress = sessionConnectionContext.IpAddress;
+            int port = sessionConnectionContext.ServerPort;
+            await StartClientAsync(ipAddress, client, port);
+            EstablishSessionPolicy(sessionConnectionContext, client);
+        }
+
+        private void ValidateState(IMultiplayerSessionConnectionContext sessionConnectionContext)
+        {
+            ValidateClient(sessionConnectionContext);
+
+            try
+            {
+                Validate.NotNull(sessionConnectionContext.IpAddress);
+            }
+            catch (ArgumentNullException ex)
+            {
+                throw new InvalidOperationException("The context is missing an IP address.", ex);
+            }
+        }
+
+        private static void ValidateClient(IMultiplayerSessionConnectionContext sessionConnectionContext)
+        {
+            try
+            {
+                Validate.NotNull(sessionConnectionContext.Client);
+            }
+            catch (ArgumentNullException ex)
+            {
+                throw new InvalidOperationException("The client must be set on the connection context before trying to negotiate a session reservation.", ex);
+            }
+        }
+
+        private static async Task StartClientAsync(string ipAddress, IClient client, int port)
+        {
+            if (!client.IsConnected)
+            {
+                await client.StartAsync(ipAddress, port);
+
+                if (!client.IsConnected)
+                {
+                    throw new ClientConnectionFailedException("The client failed to connect without providing a reason why.");
+                }
+            }
+        }
+
+        private static void EstablishSessionPolicy(IMultiplayerSessionConnectionContext sessionConnectionContext, IClient client)
+        {
+            string policyRequestCorrelationId = Guid.NewGuid().ToString();
+
+            MultiplayerSessionPolicyRequest requestPacket = new MultiplayerSessionPolicyRequest(policyRequestCorrelationId);
+            client.Send(requestPacket);
+
+            EstablishingSessionPolicy nextState = new EstablishingSessionPolicy(policyRequestCorrelationId);
+            sessionConnectionContext.UpdateConnectionState(nextState);
+        }
+
+        public void JoinSession(IMultiplayerSessionConnectionContext sessionConnectionContext)
+        {
+            throw new InvalidOperationException("Cannot join a session until a reservation has been negotiated with the server.");
+        }
+
+        public void Disconnect(IMultiplayerSessionConnectionContext sessionConnectionContext)
+        {
+            throw new InvalidOperationException("Not connected to a multiplayer server.");
+        }
+    }
+}