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import jdk.internal.net.http.quic.frames.CryptoFrame;
import jdk.internal.net.http.quic.streams.CryptoWriterQueue;
import org.testng.annotations.Test;

import java.nio.ByteBuffer;

import static org.testng.Assert.*;

/**
 * @test
 * @summary Tests jdk.internal.net.http.quic.streams,CryptoWriterQueue
 * @modules java.net.http/jdk.internal.net.http.quic.streams
 * java.net.http/jdk.internal.net.http.quic.frames
 * @run testng CryptoWriterQueueTest
 */
public class CryptoWriterQueueTest {

    /**
     * {@link CryptoWriterQueue#enqueue(ByteBuffer) enqueues} data from multiple ByteBuffer
     * instances and then expects the {@link CryptoWriterQueue#produceFrame(int)} to process
     * the enqueued data correctly.
     */
    @Test
    public void testProduceFrame() throws Exception {
        final CryptoWriterQueue writerQueue = new CryptoWriterQueue();
        final ByteBuffer buff1 = createByteBuffer(83);
        final ByteBuffer buff2 = createByteBuffer(1429);
        final ByteBuffer buff3 = createByteBuffer(4);
        // enqueue them
        writerQueue.enqueue(buff1);
        writerQueue.enqueue(buff2);
        writerQueue.enqueue(buff3);
        final int expectedRemaining = buff1.remaining() + buff2.remaining() + buff3.remaining();
        assertEquals(writerQueue.remaining(), expectedRemaining,
                "Unexpected remaining bytes in CryptoWriterQueue");
        // create frame(s) from the enqueued buffers
        final int maxPayloadSize = 1134;
        while (writerQueue.remaining() > 0) {
            final CryptoFrame frame = writerQueue.produceFrame(maxPayloadSize);
            assertNotNull(frame, "Crypto frame is null");
            assertTrue(frame.size() <= maxPayloadSize, "Crypto size " + frame.size()
                    + " exceeds max payload size of " + maxPayloadSize);
        }
    }

    private static ByteBuffer createByteBuffer(final int numBytes) {
        return ByteBuffer.wrap(new byte[numBytes]);
    }

}