/*
 * ====================================================================
 * 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.testing.nio;

import javax.net.ssl.SSLContext;

import org.apache.hc.core5.function.Callback;
import org.apache.hc.core5.http.URIScheme;
import org.apache.hc.core5.http.config.CharCodingConfig;
import org.apache.hc.core5.http.config.Http1Config;
import org.apache.hc.core5.http.impl.HttpProcessors;
import org.apache.hc.core5.http.impl.nio.ServerHttp1IOEventHandler;
import org.apache.hc.core5.http.impl.nio.ServerHttp1StreamDuplexerFactory;
import org.apache.hc.core5.http.nio.AsyncServerExchangeHandler;
import org.apache.hc.core5.http.nio.HandlerFactory;
import org.apache.hc.core5.http.protocol.HttpProcessor;
import org.apache.hc.core5.http2.HttpVersionPolicy;
import org.apache.hc.core5.http2.config.H2Config;
import org.apache.hc.core5.http2.impl.H2Processors;
import org.apache.hc.core5.http2.impl.nio.HttpProtocolNegotiator;
import org.apache.hc.core5.http2.impl.nio.ServerH2PrefaceHandler;
import org.apache.hc.core5.http2.impl.nio.ServerH2StreamMultiplexerFactory;
import org.apache.hc.core5.http2.impl.nio.ServerH2UpgradeHandler;
import org.apache.hc.core5.http2.impl.nio.ServerHttp1UpgradeHandler;
import org.apache.hc.core5.http2.ssl.ApplicationProtocol;
import org.apache.hc.core5.reactor.IOEventHandler;
import org.apache.hc.core5.reactor.IOEventHandlerFactory;
import org.apache.hc.core5.reactor.ProtocolIOSession;
import org.apache.hc.core5.reactor.ssl.SSLSessionInitializer;
import org.apache.hc.core5.reactor.ssl.SSLSessionVerifier;
import org.apache.hc.core5.util.Args;

class InternalServerProtocolNegotiationStarter implements IOEventHandlerFactory {

    private final HttpProcessor httpProcessor;
    private final HandlerFactory<AsyncServerExchangeHandler> exchangeHandlerFactory;
    private final HttpVersionPolicy versionPolicy;
    private final H2Config h2Config;
    private final Http1Config http1Config;
    private final CharCodingConfig charCodingConfig;
    private final SSLContext sslContext;
    private final SSLSessionInitializer sslSessionInitializer;
    private final SSLSessionVerifier sslSessionVerifier;
    private final Callback<Exception> exceptionCallback;

    public InternalServerProtocolNegotiationStarter(
            final HttpProcessor httpProcessor,
            final HandlerFactory<AsyncServerExchangeHandler> exchangeHandlerFactory,
            final HttpVersionPolicy versionPolicy,
            final H2Config h2Config,
            final Http1Config http1Config,
            final CharCodingConfig charCodingConfig,
            final SSLContext sslContext,
            final SSLSessionInitializer sslSessionInitializer,
            final SSLSessionVerifier sslSessionVerifier,
            final Callback<Exception> exceptionCallback) {
        this.httpProcessor = Args.notNull(httpProcessor, "HTTP processor");
        this.exchangeHandlerFactory = Args.notNull(exchangeHandlerFactory, "Exchange handler factory");
        this.versionPolicy = versionPolicy != null ? versionPolicy : HttpVersionPolicy.NEGOTIATE;
        this.h2Config = h2Config != null ? h2Config : H2Config.DEFAULT;
        this.http1Config = http1Config != null ? http1Config : Http1Config.DEFAULT;
        this.charCodingConfig = charCodingConfig != null ? charCodingConfig : CharCodingConfig.DEFAULT;
        this.sslContext = sslContext;
        this.sslSessionInitializer = sslSessionInitializer;
        this.sslSessionVerifier = sslSessionVerifier;
        this.exceptionCallback = exceptionCallback;
    }

    @Override
    public IOEventHandler createHandler(final ProtocolIOSession ioSession, final Object attachment) {
        if (sslContext != null) {
            ioSession.startTls(sslContext, null, null, sslSessionInitializer, sslSessionVerifier, null);
        }
        final ServerHttp1StreamDuplexerFactory http1StreamHandlerFactory = new ServerHttp1StreamDuplexerFactory(
                httpProcessor != null ? httpProcessor : HttpProcessors.server(),
                exchangeHandlerFactory,
                http1Config,
                charCodingConfig,
                LoggingHttp1StreamListener.INSTANCE_SERVER,
                LoggingExceptionCallback.INSTANCE);
        final ServerH2StreamMultiplexerFactory http2StreamHandlerFactory = new ServerH2StreamMultiplexerFactory(
                httpProcessor != null ? httpProcessor : H2Processors.server(),
                exchangeHandlerFactory,
                h2Config,
                charCodingConfig,
                LoggingH2StreamListener.INSTANCE);
        ioSession.registerProtocol(ApplicationProtocol.HTTP_1_1.id, new ServerHttp1UpgradeHandler(http1StreamHandlerFactory));
        ioSession.registerProtocol(ApplicationProtocol.HTTP_2.id, new ServerH2UpgradeHandler(http2StreamHandlerFactory, exceptionCallback));

        switch (versionPolicy) {
            case FORCE_HTTP_2:
                return new ServerH2PrefaceHandler(ioSession, http2StreamHandlerFactory, exceptionCallback);
            case FORCE_HTTP_1:
                return new ServerHttp1IOEventHandler(http1StreamHandlerFactory.create(
                        sslContext != null ? URIScheme.HTTPS.id : URIScheme.HTTP.id,
                        ioSession));
            default:
                return new HttpProtocolNegotiator(ioSession, null);
        }
    }

}
