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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.server;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import javax.net.ssl.SSLEngine;
import org.eclipse.jetty.http.HttpVersion;
import org.eclipse.jetty.io.AbstractConnection;
import org.eclipse.jetty.io.Connection;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.io.ssl.SslConnection;

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

    private final List negotiatedProtocols;

    private String defaultProtocol;

    public NegotiatingServerConnectionFactory(String protocol, String... negotiatedProtocols) {
        super(protocol);
        this.negotiatedProtocols = new ArrayList<>();
        if (negotiatedProtocols != null) {
            // Trim the values, as they may come from XML configuration.
            for (String p : negotiatedProtocols) {
                p = p.trim();
                if (!p.isEmpty())
                    this.negotiatedProtocols.add(p);
            }
        }
    }

    public String getDefaultProtocol() {
        return defaultProtocol;
    }

    public void setDefaultProtocol(String defaultProtocol) {
        // Trim the value, as it may come from XML configuration.
        String dft = defaultProtocol == null ? "" : defaultProtocol.trim();
        this.defaultProtocol = dft.isEmpty() ? null : dft;
    }

    public List getNegotiatedProtocols() {
        return negotiatedProtocols;
    }

    @Override
    public Connection newConnection(Connector connector, EndPoint endPoint) {
        List negotiated = this.negotiatedProtocols;
        if (negotiated.isEmpty()) {
            // Generate list of protocols that we can negotiate.
            negotiated = connector.getProtocols().stream().filter(p -> {
                ConnectionFactory f = connector.getConnectionFactory(p);
                return !(f instanceof SslConnectionFactory) && !(f instanceof NegotiatingServerConnectionFactory);
            }).collect(Collectors.toList());
        }
        // If default protocol is not set, then it is
        // either HTTP/1.1 or the first protocol given.
        String dft = defaultProtocol;
        if (dft == null && !negotiated.isEmpty()) {
            dft = negotiated.stream().filter(HttpVersion.HTTP_1_1::is).findFirst().orElse(negotiated.get(0));
        }
        SSLEngine engine = null;
        EndPoint ep = endPoint;
        while (engine == null && ep != null) {
            // TODO make more generic
            if (ep instanceof SslConnection.DecryptedEndPoint)
                engine = ((SslConnection.DecryptedEndPoint) ep).getSslConnection().getSSLEngine();
            else
                ep = null;
        }
        return configure(newServerConnection(connector, endPoint, engine, negotiated, dft), connector, endPoint);
    }

    protected abstract AbstractConnection newServerConnection(Connector connector, EndPoint endPoint, SSLEngine engine, List protocols, String defaultProtocol);

    @Override
    public String toString() {
        return String.format("%s@%x{%s,%s,%s}", getClass().getSimpleName(), hashCode(), getProtocols(), getDefaultProtocol(), getNegotiatedProtocols());
    }
}