/*
 * ====================================================================
 * 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
 * <http://www.apache.org/>.
 *
 */

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

import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.http.impl.nio.ServerHttp1StreamDuplexerFactory;
import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
import org.apache.hc.core5.http2.HttpVersionPolicy;
import org.apache.hc.core5.reactor.IOEventHandlerFactory;
import org.apache.hc.core5.reactor.TlsCapableIOSession;
import org.apache.hc.core5.util.Args;

/**
 * @since 5.0
 */
@Contract(threading = ThreadingBehavior.IMMUTABLE)
public class ServerHttpProtocolNegotiatorFactory implements IOEventHandlerFactory {

    private final ServerHttp1StreamDuplexerFactory http1StreamDuplexerFactory;
    private final ServerHttp2StreamMultiplexerFactory http2StreamMultiplexerFactory;
    private final HttpVersionPolicy versionPolicy;
    private final TlsStrategy tlsStrategy;

    public ServerHttpProtocolNegotiatorFactory(
            final ServerHttp1StreamDuplexerFactory http1StreamDuplexerFactory,
            final ServerHttp2StreamMultiplexerFactory http2StreamMultiplexerFactory,
            final HttpVersionPolicy versionPolicy,
            final TlsStrategy tlsStrategy) {
        this.http1StreamDuplexerFactory = Args.notNull(http1StreamDuplexerFactory, "HTTP/1.1 stream handler factory");
        this.http2StreamMultiplexerFactory = Args.notNull(http2StreamMultiplexerFactory, "HTTP/2 stream handler factory");
        this.versionPolicy = versionPolicy != null ? versionPolicy : HttpVersionPolicy.NEGOTIATE;
        this.tlsStrategy = tlsStrategy;
    }

    @Override
    public ServerHttpProtocolNegotiator createHandler(final TlsCapableIOSession ioSession, final Object attachment) {
        if (tlsStrategy != null) {
            tlsStrategy.upgrade(
                    ioSession,
                    null,
                    ioSession.getLocalAddress(),
                    ioSession.getRemoteAddress(),
                    attachment != null ? attachment : versionPolicy);
        }
        return new ServerHttpProtocolNegotiator(ioSession, http1StreamDuplexerFactory, http2StreamMultiplexerFactory, versionPolicy);
    }

}
