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// 
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// 
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// 
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// 
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
// 
package org.eclipse.jetty.client.http;

import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousCloseException;
import java.util.Collections;
import java.util.Iterator;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.LongAdder;
import org.eclipse.jetty.client.HttpChannel;
import org.eclipse.jetty.client.HttpConnection;
import org.eclipse.jetty.client.HttpDestination;
import org.eclipse.jetty.client.HttpExchange;
import org.eclipse.jetty.client.SendFailure;
import org.eclipse.jetty.client.api.Connection;
import org.eclipse.jetty.client.api.Request;
import org.eclipse.jetty.client.api.Response;
import org.eclipse.jetty.io.AbstractConnection;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.util.Attachable;
import org.eclipse.jetty.util.Promise;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.thread.Sweeper;

// @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
@Deprecated(since = "2021-05-27")
public class HttpConnectionOverHTTP extends AbstractConnection implements Connection, org.eclipse.jetty.io.Connection.UpgradeFrom, Sweeper.Sweepable, Attachable {

    private static final Logger LOG = Log.getLogger(HttpConnectionOverHTTP.class);

    private final AtomicBoolean closed = new AtomicBoolean();

    private final AtomicInteger sweeps = new AtomicInteger();

    private final Promise promise;

    private final Delegate delegate;

    private final HttpChannelOverHTTP channel;

    private long idleTimeout;

    private final LongAdder bytesIn = new LongAdder();

    private final LongAdder bytesOut = new LongAdder();

    public HttpConnectionOverHTTP(EndPoint endPoint, HttpDestination destination, Promise promise) {
        super(endPoint, destination.getHttpClient().getExecutor());
        this.promise = promise;
        this.delegate = new Delegate(destination);
        this.channel = newHttpChannel();
    }

    protected HttpChannelOverHTTP newHttpChannel() {
        return new HttpChannelOverHTTP(this);
    }

    public HttpChannelOverHTTP getHttpChannel() {
        return channel;
    }

    public HttpDestinationOverHTTP getHttpDestination() {
        return (HttpDestinationOverHTTP) delegate.getHttpDestination();
    }

    @Override
    public long getBytesIn() {
        return bytesIn.longValue();
    }

    protected void addBytesIn(long bytesIn) {
        this.bytesIn.add(bytesIn);
    }

    @Override
    public long getBytesOut() {
        return bytesOut.longValue();
    }

    protected void addBytesOut(long bytesOut) {
        this.bytesOut.add(bytesOut);
    }

    @Override
    public long getMessagesIn() {
        return getHttpChannel().getMessagesIn();
    }

    @Override
    public long getMessagesOut() {
        return getHttpChannel().getMessagesOut();
    }

    @Override
    public void send(Request request, Response.CompleteListener listener) {
        delegate.send(request, listener);
    }

    protected SendFailure send(HttpExchange exchange) {
        return delegate.send(exchange);
    }

    @Override
    public void onOpen() {
        super.onOpen();
        fillInterested();
        promise.succeeded(this);
    }

    @Override
    public boolean isClosed() {
        return closed.get();
    }

    @Override
    public void setAttachment(Object obj) {
        delegate.setAttachment(obj);
    }

    @Override
    public Object getAttachment() {
        return delegate.getAttachment();
    }

    @Override
    public boolean onIdleExpired() {
        long idleTimeout = getEndPoint().getIdleTimeout();
        boolean close = onIdleTimeout(idleTimeout);
        if (close)
            close(new TimeoutException("Idle timeout " + idleTimeout + " ms"));
        return false;
    }

    protected boolean onIdleTimeout(long idleTimeout) {
        return delegate.onIdleTimeout(idleTimeout);
    }

    @Override
    public void onFillable() {
        channel.receive();
    }

    @Override
    public ByteBuffer onUpgradeFrom() {
        HttpReceiverOverHTTP receiver = channel.getHttpReceiver();
        return receiver.onUpgradeFrom();
    }

    public void release() {
        // Restore idle timeout
        getEndPoint().setIdleTimeout(idleTimeout);
        getHttpDestination().release(this);
    }

    @Override
    public void close() {
        close(new AsynchronousCloseException());
    }

    protected void close(Throwable failure) {
        if (closed.compareAndSet(false, true)) {
            getHttpDestination().remove(this);
            abort(failure);
            channel.destroy();
            getEndPoint().shutdownOutput();
            if (LOG.isDebugEnabled())
                LOG.debug("Shutdown {}", this);
            getEndPoint().close();
            if (LOG.isDebugEnabled())
                LOG.debug("Closed {}", this);
        }
    }

    protected boolean abort(Throwable failure) {
        HttpExchange exchange = channel.getHttpExchange();
        return exchange != null && exchange.getRequest().abort(failure);
    }

    @Override
    public boolean sweep() {
        if (!closed.get())
            return false;
        return sweeps.incrementAndGet() >= 4;
    }

    public void remove() {
        getHttpDestination().remove(this);
    }

    @Override
    public String toConnectionString() {
        return String.format("%s@%x(l:%s <-> r:%s,closed=%b)=>%s", getClass().getSimpleName(), hashCode(), getEndPoint().getLocalAddress(), getEndPoint().getRemoteAddress(), closed.get(), channel);
    }

    // @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
    @Deprecated(since = "2021-05-27")
    private class Delegate extends HttpConnection {

        private Delegate(HttpDestination destination) {
            super(destination);
        }

        @Override
        protected Iterator getHttpChannels() {
            return Collections.singleton(channel).iterator();
        }

        @Override
        protected SendFailure send(HttpExchange exchange) {
            Request request = exchange.getRequest();
            normalizeRequest(request);
            // Save the old idle timeout to restore it.
            EndPoint endPoint = getEndPoint();
            idleTimeout = endPoint.getIdleTimeout();
            long requestIdleTimeout = request.getIdleTimeout();
            if (requestIdleTimeout >= 0)
                endPoint.setIdleTimeout(requestIdleTimeout);
            // One channel per connection, just delegate the send.
            return send(channel, exchange);
        }

        @Override
        public void close() {
            HttpConnectionOverHTTP.this.close();
            destroy();
        }

        @Override
        public boolean isClosed() {
            return HttpConnectionOverHTTP.this.isClosed();
        }

        @Override
        public String toString() {
            return HttpConnectionOverHTTP.this.toString();
        }
    }
}