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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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 */

package org.apache.hc.core5.http2.impl.nio;

import java.io.IOException;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;

import javax.net.ssl.SSLSession;

import org.apache.hc.core5.annotation.Internal;
import org.apache.hc.core5.concurrent.FutureCallback;
import org.apache.hc.core5.http.ConnectionClosedException;
import org.apache.hc.core5.http.EndpointDetails;
import org.apache.hc.core5.http.HttpVersion;
import org.apache.hc.core5.http.ProtocolVersion;
import org.apache.hc.core5.http.impl.nio.HttpConnectionEventHandler;
import org.apache.hc.core5.http.nio.command.CommandSupport;
import org.apache.hc.core5.http2.ssl.ApplicationProtocol;
import org.apache.hc.core5.io.CloseMode;
import org.apache.hc.core5.io.SocketTimeoutExceptionFactory;
import org.apache.hc.core5.reactor.IOSession;
import org.apache.hc.core5.reactor.ProtocolIOSession;
import org.apache.hc.core5.reactor.ssl.TlsDetails;
import org.apache.hc.core5.util.Args;
import org.apache.hc.core5.util.TextUtils;
import org.apache.hc.core5.util.Timeout;

/**
 * @since 5.2
 */
@Internal
public class HttpProtocolNegotiator implements HttpConnectionEventHandler {

    private final ProtocolIOSession ioSession;
    private final FutureCallback resultCallback;
    private final AtomicBoolean completed;
    private final AtomicReference negotiatedProtocolRef;

    public HttpProtocolNegotiator(
            final ProtocolIOSession ioSession,
            final FutureCallback resultCallback) {
        this.ioSession = Args.notNull(ioSession, "I/O session");
        this.resultCallback = resultCallback;
        this.completed = new AtomicBoolean();
        this.negotiatedProtocolRef = new AtomicReference<>();
    }

    void startProtocol(final HttpVersion httpVersion) {
        ioSession.switchProtocol(
                httpVersion == HttpVersion.HTTP_2 ? ApplicationProtocol.HTTP_2.id : ApplicationProtocol.HTTP_1_1.id,
                resultCallback);
        negotiatedProtocolRef.set(httpVersion);
    }

    @Override
    public void connected(final IOSession session) throws IOException {
        final HttpVersion httpVersion;
        final TlsDetails tlsDetails = ioSession.getTlsDetails();
        if (tlsDetails != null) {
            final String appProtocol = tlsDetails.getApplicationProtocol();
            if (TextUtils.isEmpty(appProtocol)) {
                httpVersion = HttpVersion.HTTP_1_1;
            } else if (appProtocol.equals(ApplicationProtocol.HTTP_1_1.id)) {
                httpVersion = HttpVersion.HTTP_1_1;
            } else if (appProtocol.equals(ApplicationProtocol.HTTP_2.id)) {
                httpVersion = HttpVersion.HTTP_2;
            } else {
                throw new ProtocolNegotiationException("Unsupported application protocol: " + appProtocol);
            }
        } else {
            httpVersion = HttpVersion.HTTP_1_1;
        }
        startProtocol(httpVersion);
    }
    @Override
    public void inputReady(final IOSession session, final ByteBuffer src) throws IOException  {
        throw new ProtocolNegotiationException("Unexpected input");
    }

    @Override
    public void outputReady(final IOSession session) throws IOException {
        throw new ProtocolNegotiationException("Unexpected output");
    }

    @Override
    public void timeout(final IOSession session, final Timeout timeout) {
        exception(session, SocketTimeoutExceptionFactory.create(timeout));
    }

    @Override
    public void exception(final IOSession session, final Exception cause) {
        try {
            session.close(CloseMode.IMMEDIATE);
            CommandSupport.failCommands(session, cause);
        } catch (final Exception ex) {
            if (completed.compareAndSet(false, true) && resultCallback != null) {
                resultCallback.failed(ex);
            }
        }
    }

    @Override
    public void disconnected(final IOSession session) {
        try {
            CommandSupport.cancelCommands(session);
        } finally {
            if (completed.compareAndSet(false, true) && resultCallback != null) {
                resultCallback.failed(new ConnectionClosedException());
            }
        }
    }

    @Override
    public SSLSession getSSLSession() {
        final TlsDetails tlsDetails = ioSession.getTlsDetails();
        return tlsDetails != null ? tlsDetails.getSSLSession() : null;
    }

    @Override
    public EndpointDetails getEndpointDetails() {
        return null;
    }

    @Override
    public void setSocketTimeout(final Timeout timeout) {
        ioSession.setSocketTimeout(timeout);
    }

    @Override
    public Timeout getSocketTimeout() {
        return ioSession.getSocketTimeout();
    }

    @Override
    public ProtocolVersion getProtocolVersion() {
        return negotiatedProtocolRef.get();
    }

    @Override
    public SocketAddress getRemoteAddress() {
        return ioSession.getRemoteAddress();
    }

    @Override
    public SocketAddress getLocalAddress() {
        return ioSession.getLocalAddress();
    }

    @Override
    public boolean isOpen() {
        return ioSession.isOpen();
    }

    @Override
    public void close() throws IOException {
        ioSession.close();
    }

    @Override
    public void close(final CloseMode closeMode) {
        ioSession.close(closeMode);
    }

    @Override
    public String toString() {
        return getClass().getName();
    }

}