package alice.datasegment;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.channels.SocketChannel;
import java.util.concurrent.LinkedBlockingQueue;

import org.apache.log4j.Logger;

import alice.codesegment.CodeSegment;
import alice.daemon.Connection;
import alice.daemon.IncomingTcpConnection;
import alice.daemon.OutboundTcpConnection;

public class RemoteDataSegmentManager extends DataSegmentManager {
    protected Connection connection;
    protected Logger logger;

    public RemoteDataSegmentManager(){}

    public RemoteDataSegmentManager(final String connectionKey, final String reverseKey, final String hostName, final int port) {
        logger = Logger.getLogger(connectionKey);
        connection = new Connection();
        connection.name = connectionKey;
        final RemoteDataSegmentManager manager = this;
        //new Thread(replyThread, "RemoteDataSegmentManager-" + connectionKey).start();
        new Thread("Connect-" + connectionKey) {
            public void run() {
                boolean connect = true;
                do {
                    try {
                        //System.out.println("RemoteDSM connect hostname:" + hostName + " port:" + port);
                        SocketChannel sc = SocketChannel.open(new InetSocketAddress(hostName, port));
                        connection.socket = sc.socket();
                        connection.socket.setTcpNoDelay(true);
                        connect = false;
                        logger.info("Connect to " + connection.getInfoString());
                    } catch (IOException e) {
                        //System.err.println("Can not connect" + e);
                        try {
                            Thread.sleep(50);
                        } catch (InterruptedException e1) {
                            e1.printStackTrace();
                        }
                    }
                } while (connect);
                IncomingTcpConnection in = new IncomingTcpConnection(connection, manager, reverseKey);
                in.setName(reverseKey+"-IncomingTcp");
                in.setPriority(MAX_PRIORITY);
                in.start();
                OutboundTcpConnection out = new OutboundTcpConnection(connection);
                out.setName(connectionKey + "-OutboundTcp");
                out.setPriority(MAX_PRIORITY);
                out.start();
            }
        }.start();
    }

    /**
     * send put command to target DataSegment
     */
    @Override
    public void put(String key, ReceiveData rData, boolean quickFlag) {
        Command cmd = new Command(CommandType.PUT, null, key, rData, 0, 0, null, null, "");

        put1(quickFlag, cmd);
    }

    public void put1(boolean quickFlag, Command cmd) {
        if (quickFlag){
            connection.write(cmd); // put command is executed right now
        } else {
            connection.sendCommand(cmd); // put command on the transmission thread
        }
        if (logger.isDebugEnabled())
            logger.debug(cmd.getCommandString());
    }

    @Override
    public void update(String key, ReceiveData rData, boolean quickFlag) {
        Command cmd = new Command(CommandType.UPDATE, null, key, rData, 0, 0, null, null, "");

        put1(quickFlag, cmd);
    }

    @Override
    public void take(Receiver receiver, CodeSegment cs, boolean quickFlag) {

        Command cmd = new Command(CommandType.TAKE, receiver, receiver.key, null, receiver.index, 0, replyQueue, cs, null);
        take1(quickFlag, cmd);
    }

    public void take1(boolean quickFlag, Command cmd) {
        int seq = this.seq.getAndIncrement();
        //System.err.println("DataSegment take seq :" + seq);
        cmd.setSeq(seq);
        seqHash.put(seq, cmd);
        cmd.setQuickFlag(quickFlag);
        if (quickFlag){
            connection.write(cmd);
        } else {
            connection.sendCommand(cmd);
        }
        if (logger.isDebugEnabled())
            logger.debug(cmd.getCommandString());
    }

    @Override
    public void peek(Receiver receiver, CodeSegment cs, boolean quickFlag) {
        Command cmd = new Command(CommandType.PEEK, receiver, receiver.key, null, receiver.index, 0, replyQueue, cs, null);
        take1(quickFlag, cmd);
    }

    @Override
    public void remove(String key) {
        Command cmd = new Command(CommandType.REMOVE, null, key, null, 0, 0, null, null, "");
        connection.sendCommand(cmd);
        if (logger.isDebugEnabled())
            logger.debug(cmd.getCommandString());
    }

    @Override
    public void finish() {
        Command cmd = new Command(CommandType.FINISH, null, null, null, 0, 0, null, null, "");
        connection.sendCommand(cmd);
    }

    @Override
    public void ping(String returnKey) {
        Command cmd = new Command(CommandType.PING, null, returnKey, null, 0, 0, null, null, "");
        connection.write(cmd);
    }

    @Override
    public void response(String returnKey) {
        Command cmd = new Command(CommandType.RESPONSE, null, returnKey, null, 0, 0, null, null, "");
        connection.write(cmd);
    }

    @Override
    public void close() {
        Command cmd = new Command(CommandType.CLOSE, null, null, null, 0, 0, null, null, "");
        connection.sendManager = false;
        connection.sendCommand(cmd);
    }

    @Override
    public void shutdown() {
        connection.close();
        LinkedBlockingQueue<Command> queue = connection.sendQueue;
        if (!queue.isEmpty()) queue.clear();
    }

    @Override
    public void setSendError(boolean b) {
        connection.sendManager = b;
    }

}