/// <summary>
/// Initializes a new instance of the <see cref="Peer" /> class.
/// </summary>
/// <param name="communicator">The communicator.</param>
/// <param name="pieceManager">The piece manager.</param>
/// <param name="localPeerId">The local peer identifier.</param>
/// <param name="peerId">The peer identifier.</param>
public Peer(PeerCommunicator communicator, PieceManager pieceManager, string localPeerId, string peerId = null)
{
communicator.CannotBeNull();
pieceManager.CannotBeNull();
localPeerId.CannotBeNullOrEmpty();
this.PeerId = peerId;
this.localPeerId = localPeerId;
this.BitField = new bool[pieceManager.PieceCount];
this.HandshakeState = peerId == null ? HandshakeState.SentButNotReceived : HandshakeState.SendAndReceived;
this.SeedingState = SeedingState.Choked;
this.LeechingState = LeechingState.Uninterested;
this.Downloaded = 0;
this.Uploaded = 0;
this.communicator = communicator;
this.communicator.MessageReceived += this.Communicator_MessageReceived;
this.communicator.CommunicationError += this.Communicator_CommunicationError;
this.pieceManager = pieceManager;
this.pieceManager.PieceCompleted += this.PieceManager_PieceCompleted;
this.Endpoint = this.communicator.Endpoint;
this.StartSending();
this.StartDownloading();
this.StartUploading();
this.StartKeepingConnectionAlive();
// send handshake
this.EnqueueSendMessage(new HandshakeMessage(this.pieceManager.TorrentInfoHash, localPeerId, HandshakeMessage.ProtocolName));
}