/*
 * ====================================================================
 * 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.client5.http.impl.nio;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.concurrent.Future;

import org.apache.hc.client5.http.DnsResolver;
import org.apache.hc.client5.http.SchemePortResolver;
import org.apache.hc.client5.http.UnsupportedSchemeException;
import org.apache.hc.client5.http.impl.DefaultSchemePortResolver;
import org.apache.hc.client5.http.nio.AsyncClientConnectionOperator;
import org.apache.hc.client5.http.nio.ManagedAsyncClientConnection;
import org.apache.hc.core5.annotation.Internal;
import org.apache.hc.core5.concurrent.ComplexFuture;
import org.apache.hc.core5.concurrent.FutureCallback;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.config.Lookup;
import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
import org.apache.hc.core5.reactor.ConnectionInitiator;
import org.apache.hc.core5.reactor.IOSession;
import org.apache.hc.core5.util.Args;
import org.apache.hc.core5.util.TimeValue;

/**
 * Default {@link AsyncClientConnectionOperator} implementation.
 *
 * @since 5.0
 */
@Internal
final class DefaultAsyncClientConnectionOperator implements AsyncClientConnectionOperator {

    private final SchemePortResolver schemePortResolver;
    private final MultihomeIOSessionRequester sessionRequester;
    private final Lookup<TlsStrategy> tlsStrategyLookup;

    DefaultAsyncClientConnectionOperator(
            final Lookup<TlsStrategy> tlsStrategyLookup,
            final SchemePortResolver schemePortResolver,
            final DnsResolver dnsResolver) {
        this.tlsStrategyLookup = Args.notNull(tlsStrategyLookup, "TLS strategy lookup");
        this.schemePortResolver = schemePortResolver != null ? schemePortResolver : DefaultSchemePortResolver.INSTANCE;
        this.sessionRequester = new MultihomeIOSessionRequester(dnsResolver);
    }

    @Override
    public Future<ManagedAsyncClientConnection> connect(
            final ConnectionInitiator connectionInitiator,
            final HttpHost host,
            final SocketAddress localAddress,
            final TimeValue connectTimeout,
            final Object attachment,
            final FutureCallback<ManagedAsyncClientConnection> callback) {
        Args.notNull(connectionInitiator, "Connection initiator");
        Args.notNull(host, "Host");
        final ComplexFuture<ManagedAsyncClientConnection> future = new ComplexFuture<>(callback);
        final HttpHost remoteEndpoint;
        try {
            remoteEndpoint = host.getPort() > 0 ? host :
                    new HttpHost(host.getHostName(), schemePortResolver.resolve(host), host.getSchemeName());
        } catch (final UnsupportedSchemeException ex) {
            future.failed(ex);
            return future;
        }
        final InetAddress remoteAddress = host.getAddress();
        final TlsStrategy tlsStrategy = tlsStrategyLookup != null ? tlsStrategyLookup.lookup(host.getSchemeName()) : null;
        final Future<IOSession> sessionFuture = sessionRequester.connect(
                connectionInitiator,
                remoteEndpoint,
                remoteAddress != null ? new InetSocketAddress(remoteAddress, remoteEndpoint.getPort()) : null,
                localAddress,
                connectTimeout,
                attachment,
                new FutureCallback<IOSession>() {

                    @Override
                    public void completed(final IOSession session) {
                        final DefaultManagedAsyncClientConnection connection = new DefaultManagedAsyncClientConnection(session);
                        if (tlsStrategy != null) {
                            tlsStrategy.upgrade(
                                    connection,
                                    host,
                                    session.getLocalAddress(),
                                    session.getRemoteAddress(),
                                    attachment);
                        }
                        future.completed(connection);
                    }

                    @Override
                    public void failed(final Exception ex) {
                        future.failed(ex);
                    }

                    @Override
                    public void cancelled() {
                        future.cancel();
                    }

                });
        future.setDependency(sessionFuture);
        return future;
    }

    @Override
    public void upgrade(final ManagedAsyncClientConnection connection, final HttpHost host, final Object attachment) {
        final TlsStrategy tlsStrategy = tlsStrategyLookup != null ? tlsStrategyLookup.lookup(host.getSchemeName()) : null;
        if (tlsStrategy != null) {
            tlsStrategy.upgrade(
                    connection,
                    host,
                    connection.getLocalAddress(),
                    connection.getRemoteAddress(),
                    attachment);
        }

    }
}
