Ragon/Ragon.Client/Sources/RagonClient.cs

/*
 * Copyright 2023-2024 Eduard Kargin <kargin.eduard@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using Ragon.Protocol;

namespace Ragon.Client
{
  public sealed class RagonClient
  {
    private readonly INetworkConnection _connection;
    private readonly NetworkStatistics _stats;

    private IHandler[] _handlers;
    private RagonStream _readBuffer;
    private RagonStream _writeBuffer;
    private RagonRoom _room;
    private RagonSession _session;
    private RagonListenerList _listeners;
    private RagonPlayerCache _playerCache;
    private RagonEventCache _eventCache;
    private RagonState _state;

    private double _serverTimestamp;
    private float _replicationRate = 0;
    private float _replicationTime = 0;

    public double ServerTimestamp => _serverTimestamp;
    public IRagonConnection Connection => _connection;
    public RagonState State => _state;
    public RagonSession Session => _session;
    public RagonEventCache Event => _eventCache;
    public NetworkStatistics Statistics => _stats;
    public RagonRoom Room => _room;

    internal RagonStream Buffer => _writeBuffer;
    internal INetworkChannel Reliable => _connection.Reliable;
    internal INetworkChannel Unreliable => _connection.Unreliable;

    #region PUBLIC

    public RagonClient(INetworkConnection connection, int rate)
    {
      _listeners = new RagonListenerList(this);

      _connection = connection;
      _connection.OnData += OnData;
      _connection.OnConnected += OnConnected;
      _connection.OnDisconnected += OnDisconnected;

      _replicationRate = (1000.0f / rate) / 1000.0f;
      _replicationTime = 0;

      _eventCache = new RagonEventCache();
      _writeBuffer = new RagonStream();
      _readBuffer = new RagonStream();
      _playerCache = new RagonPlayerCache();
      _session = new RagonSession(this, _writeBuffer);
      _room = new RagonRoom(this, _playerCache);
      _stats = new NetworkStatistics();
      _state = RagonState.DISCONNECTED;
      
      _handlers = new IHandler[byte.MaxValue];
      _handlers[(byte)RagonOperation.AUTHORIZED_SUCCESS] = new AuthorizeSuccessHandler(this, _listeners);
      _handlers[(byte)RagonOperation.AUTHORIZED_FAILED] = new AuthorizeFailedHandler(_listeners);
      _handlers[(byte)RagonOperation.JOIN_SUCCESS] = new JoinSuccessHandler(this, _room);
      _handlers[(byte)RagonOperation.JOIN_FAILED] = new JoinFailedHandler(_listeners);
      _handlers[(byte)RagonOperation.LEAVE_ROOM] = new LeaveRoomHandler(this, _listeners);
      _handlers[(byte)RagonOperation.OWNERSHIP_ROOM_CHANGED] = new OwnershipRoomHandler(_listeners, _playerCache);
      _handlers[(byte)RagonOperation.PLAYER_JOINED] = new PlayerJoinHandler(_playerCache, _listeners);
      _handlers[(byte)RagonOperation.PLAYER_LEAVED] = new PlayerLeftHandler(_playerCache, _listeners);
      _handlers[(byte)RagonOperation.REPLICATE_ROOM_EVENT] = new RoomEventHandler(this, _playerCache);
      _handlers[(byte)RagonOperation.TIMESTAMP_SYNCHRONIZATION] = new TimestampHandler(this);
      _handlers[(byte)RagonOperation.ROOM_LIST_UPDATED] = new RoomListHandler(_session, _listeners);
      _handlers[(byte)RagonOperation.ROOM_DATA_UPDATED] = new RoomUserDataHandler(this, _listeners);
      _handlers[(byte)RagonOperation.PLAYER_DATA_UPDATED] = new PlayerUserDataHandler(_playerCache, _listeners);
    }
    
    public void Connect(string address, ushort port, string protocol)
    {
      var protocolRaw = RagonVersion.Parse(protocol);
      _connection.Connect(address, port, protocolRaw);
    }

    public void Disconnect()
    {
      _state = RagonState.DISCONNECTED;
      _room.Clear();
      
      _connection.Disconnect();

      OnDisconnected(RagonDisconnect.MANUAL);
    }

    public void Update(float dt)
    {
      if (_state != RagonState.DISCONNECTED)
      {
        _replicationTime += dt;
        if (_replicationTime >= _replicationRate)
        {
          _replicationTime = 0;
        
          SendTimestamp();
          SendRoomUserData();
          SendPlayerUserData();
        }

        _stats.Update(_connection.BytesSent, _connection.BytesReceived, _connection.Ping, dt);
      }

      _listeners.Update();
      _connection.Update();
    }

    public void Dispose()
    {
      if (_state != RagonState.DISCONNECTED)
      {
        _state = RagonState.DISCONNECTED;
        _connection.Disconnect();
      }

      _connection.Dispose();
    }

    public void AddListener(IRagonListener listener) => _listeners.Add(listener);
    public void AddListener(IRagonAuthorizationListener listener) => _listeners.Add(listener);
    public void AddListener(IRagonConnectionListener listener) => _listeners.Add(listener);
    public void AddListener(IRagonFailedListener listener) => _listeners.Add(listener);
    public void AddListener(IRagonJoinListener listener) => _listeners.Add(listener);
    public void AddListener(IRagonLeftListener listener) => _listeners.Add(listener);
    public void AddListener(IRagonOwnershipChangedListener listener) => _listeners.Add(listener);
    public void AddListener(IRagonPlayerJoinListener listener) => _listeners.Add(listener);
    public void AddListener(IRagonPlayerLeftListener listener) => _listeners.Add(listener);
    public void AddListener(IRagonRoomListListener listener) => _listeners.Add(listener);
    public void AddListener(IRagonPlayerUserDataListener listener) => _listeners.Add(listener);
    public void AddListener(IRagonRoomUserDataListener listener) => _listeners.Add(listener);
    public void RemoveListener(IRagonListener listener) => _listeners.Remove(listener);
    public void RemoveListener(IRagonAuthorizationListener listener) => _listeners.Remove(listener);
    public void RemoveListener(IRagonConnectionListener listener) => _listeners.Remove(listener);
    public void RemoveListener(IRagonFailedListener listener) => _listeners.Remove(listener);
    public void RemoveListener(IRagonJoinListener listener) => _listeners.Remove(listener);
    public void RemoveListener(IRagonLeftListener listener) => _listeners.Remove(listener);
    public void RemoveListener(IRagonOwnershipChangedListener listener) => _listeners.Remove(listener);
    public void RemoveListener(IRagonPlayerJoinListener listener) => _listeners.Remove(listener);
    public void RemoveListener(IRagonPlayerLeftListener listener) => _listeners.Remove(listener);
    public void RemoveListener(IRagonRoomListListener listener) => _listeners.Remove(listener);
    public void RemoveListener(IRagonRoomUserDataListener listener) => _listeners.Remove(listener);
    public void RemoveListener(IRagonPlayerUserDataListener listener) => _listeners.Remove(listener);

    #endregion

    #region INTERNAL
    
    internal void UpdateState(RagonState state)
    {
      _state = state;
    }

    internal void UpdateTimestamp(double time)
    {
      _serverTimestamp = time;
    }

    #endregion

    #region PRIVATE

    private void SendTimestamp()
    {
      var timestamp = RagonTime.CurrentTimestamp();
      var value = new DoubleToUInt()
      {
        Double = timestamp,
      };

      _writeBuffer.Clear();
      _writeBuffer.WriteOperation(RagonOperation.TIMESTAMP_SYNCHRONIZATION);
      _writeBuffer.WriteInt((int)value.Int0);
      _writeBuffer.WriteInt((int)value.Int1);
    }

    private void SendRoomUserData()
    {
      if (_room == null) return;

      var props = _room.UserData;
      if (!props.Dirty) return;

      _writeBuffer.Clear();
      _writeBuffer.WriteOperation(RagonOperation.ROOM_DATA_UPDATED);

      props.Write(_writeBuffer);

      var sendData = _writeBuffer.ToArray();
      _connection.Reliable.Send(sendData);
    }

    private void SendPlayerUserData()
    {
      if (_playerCache.Local == null) return;

      var props = _playerCache.Local.UserData;
      if (!props.Dirty) return;

      _writeBuffer.Clear();
      _writeBuffer.WriteOperation(RagonOperation.PLAYER_DATA_UPDATED);

      props.Write(_writeBuffer);

      var sendData = _writeBuffer.ToArray();
      _connection.Reliable.Send(sendData);
    }

    private void OnConnected()
    {
      RagonLog.Trace("Connected");

      _listeners.OnConnected();
      _state = RagonState.CONNECTED;
    }

    private void OnDisconnected(RagonDisconnect reason)
    {
      RagonLog.Trace($"Disconnected: {reason}");

      _listeners.OnDisconnected(reason);
      _state = RagonState.DISCONNECTED;
    }

    private void OnData(byte[] data)
    {
      _readBuffer.Clear();
      _readBuffer.FromArray(data);

      var operation = _readBuffer.ReadByte();
      _handlers[operation].Handle(_readBuffer);
    }

    #endregion
  }
}