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package com.sun.grizzly.config;

import com.sun.grizzly.util.SSLUtils;
import com.sun.grizzly.util.ThreadAttachment;
import com.sun.grizzly.util.Utils;
import com.sun.grizzly.util.WorkerThread;

import javax.net.ssl.SSLEngine;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;

/**
 * Set of Grizzly network utilities
 *
 * @author Alexey Stashok
 */
public class GrizzlyUtils {
    /**
     * Reads bytes to the WorkerThread associated ByteBuffers. Could be used to read both raw
     * and secured data.
     *
     * @param key SelectionKey
     * @param timeout read timeout
     *
     * @return number of read bytes
     *
     * @throws IOException
     */
    public static int readToWorkerThreadBuffers(final SelectionKey key, final int timeout) throws IOException {
        final Object attachment = key.attachment();
        SSLEngine sslEngine = null;
        if (attachment instanceof ThreadAttachment) {
            sslEngine = ((ThreadAttachment) attachment).getSSLEngine();
        }
        final WorkerThread thread = (WorkerThread) Thread.currentThread();
        if (sslEngine == null) {
            return Utils.readWithTemporarySelector(key.channel(),
                thread.getByteBuffer(), timeout).bytesRead;
        } else {
            // if ssl - try to unwrap secured buffer first
            ByteBuffer byteBuffer = thread.getByteBuffer();
            final ByteBuffer securedBuffer = thread.getInputBB();
            if (securedBuffer.position() > 0) {
                final int initialPosition = byteBuffer.position();
                byteBuffer =
                    SSLUtils.unwrapAll(byteBuffer, securedBuffer, sslEngine);
                final int producedBytes = byteBuffer.position() - initialPosition;
                if (producedBytes > 0) {
                    return producedBytes;
                }
            }
            // if no bytes were unwrapped - read more
            return SSLUtils.doSecureRead(key.channel(), sslEngine, byteBuffer,
                securedBuffer).bytesRead;
        }
    }
}