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/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 *
 */
package org.apache.qpid.proton.engine.impl;

import org.apache.qpid.proton.engine.Delivery;
import org.apache.qpid.proton.engine.Receiver;
import org.apache.qpid.proton.engine.Sequence;

public class ReceiverImpl extends LinkImpl implements Receiver
{

    @Override
    public boolean advance()
    {
        if(current() != null)
        {
            current().setDone();
        }
        final boolean advance = super.advance();
        if(advance)
        {
            decrementQueued();
            decrementCredit();
        }
        return advance;
    }

    private TransportReceiver _transportReceiver;
    private int _unsentCredits;


    public ReceiverImpl(SessionImpl session, String name)
    {
        super(session, name);
    }

    public void flow(final int credits)
    {
        modified();
        addCredit(credits);
        setDrain(false);
        _unsentCredits += credits;
    }

    int clearUnsentCredits()
    {
        int credits = _unsentCredits;
        _unsentCredits = 0;
        return credits;
    }


    public int recv(final byte[] bytes, int offset, int size)
    {
        return _current.recv(bytes, offset, size);
    }

    public Sequence unsettled()
    {
        return null;  //TODO.
    }

    public void free()
    {
        getSession().freeReceiver(this);

        super.free();
        //TODO.
    }

    boolean hasIncoming()
    {
        return false;  //TODO - Implement
    }

    void setTransportLink(TransportReceiver transportReceiver)
    {
        _transportReceiver = transportReceiver;
    }

    @Override
    TransportReceiver getTransportLink()
    {
        return _transportReceiver;
    }

    @Override
    boolean workUpdate(DeliveryImpl delivery)
    {
        return (delivery == current());
    }

    public void drain(int credit)
    {
        flow(credit);
        setDrain(true);
    }
}