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/*
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 *
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 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
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 * GPL Classpath Exception:
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 *
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package org.glassfish.grizzly.http2;

import java.util.Arrays;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.net.ssl.SSLEngine;
import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.Grizzly;
import org.glassfish.grizzly.npn.AlpnClientNegotiator;

import static org.glassfish.grizzly.http2.Http2Constants.HTTP11;
import static org.glassfish.grizzly.http2.Http2Constants.HTTP2;

/**
 *
 * @author oleksiys
 */
class AlpnClientNegotiatorImpl implements AlpnClientNegotiator {
    private final static Logger LOGGER = Grizzly.logger(AlpnClientNegotiatorImpl.class);

    private final String[] supportedProtocolsStr = new String[] { HTTP2, HTTP11 };
    private final Http2ClientFilter filter;

    public AlpnClientNegotiatorImpl(final Http2ClientFilter filter) {
        this.filter = filter;
    }

    @Override
    public String[] getProtocols(final SSLEngine sslEngine) {
        if (LOGGER.isLoggable(Level.INFO)) {
            LOGGER.log(Level.INFO, "Alpn getProtocols. Connection={0}, protocols={1}",
                    new Object[]{AlpnSupport.getConnection(sslEngine), Arrays.toString(supportedProtocolsStr)});
        }
        return supportedProtocolsStr;
    }

    @Override
    public void protocolSelected(final SSLEngine sslEngine, final String selectedProtocol) {
        if (LOGGER.isLoggable(Level.INFO)) {
            LOGGER.log(Level.INFO, "Alpn protocolSelected. Connection={0}, protocol={1}",
                    new Object[]{AlpnSupport.getConnection(sslEngine), selectedProtocol});
        }
        
        final Connection connection = AlpnSupport.getConnection(sslEngine);
        if (HTTP2.equals(selectedProtocol)) {
            final Http2Connection http2Connection =
                    filter.createClientHttp2Connection(connection);
            
            // we expect preface
            http2Connection.getHttp2State().setDirectUpgradePhase();
            
            http2Connection.sendPreface();
        } else {
            // Never try HTTP2 for this connection
            Http2State.create(connection).setNeverHttp2();
        }
    }
    
}