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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.AlpnServerNegotiator;

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

// ---------------------------------------------------------- Nested Classes

final class AlpnServerNegotiatorImpl implements AlpnServerNegotiator {
    private final static Logger LOGGER = Grizzly.logger(AlpnServerNegotiatorImpl.class);

    private final String[] supportedProtocols = new String[] { HTTP2, HTTP11 };
    private final Http2BaseFilter filter;
    // ---------------------------------------------------- Constructors

    public AlpnServerNegotiatorImpl(final Http2ServerFilter http2HandlerFilter) {
        this.filter = http2HandlerFilter;
    }

    // ------------------------------- Methods from ServerSideNegotiator
    @Override
    public String selectProtocol(SSLEngine sslEngine, String[] clientProtocols) {
        final Connection connection = AlpnSupport.getConnection(sslEngine);
        if (LOGGER.isLoggable(Level.INFO)) {
            LOGGER.log(Level.INFO, "Alpn selectProtocol. Connection={0} sslEngine={1} clientProtocols={2}", new Object[]{connection, sslEngine, Arrays.toString(clientProtocols)});
        }
        for (String supportedProtocol : supportedProtocols) {
            for (String clientProtocol : clientProtocols) {
                if (supportedProtocol.equals(clientProtocol)) {
                    if (LOGGER.isLoggable(Level.INFO)) {
                        LOGGER.log(Level.INFO, "Alpn select {0}", clientProtocol);
                    }
                    configureHttp2(connection, clientProtocol);
                    return clientProtocol;
                }
            }
        }
        
        // Never try HTTP2 for this connection
        Http2State.create(connection).setNeverHttp2();
        
        return null;
    }

    private void configureHttp2(final Connection connection, final String supportedProtocol) {
        if (HTTP2.equals(supportedProtocol)) {
        // If HTTP2 is supported - initialize HTTP2 connection
            // Create HTTP2 connection and bind it to the Grizzly connection
            final Http2Connection http2Connection =
                    filter.createHttp2Connection(connection, true);
            
            // we expect client preface
            http2Connection.getHttp2State().setDirectUpgradePhase();
            // !!! DON'T SEND PREFACE HERE
            // SSL connection (handshake) is not established yet and if we try
            // to send preface here SSLBaseFilter will try to flush it right away,
            // because it doesn't queue the output data like SSLFilter.
//            http2Connection.enableHttp2Output();
//            http2Connection.sendPreface();
        }
    }
    
} // END ProtocolNegotiator