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package com.firefly.codec.http2.encode;

import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.List;

import com.firefly.codec.http2.frame.Flags;
import com.firefly.codec.http2.frame.Frame;
import com.firefly.codec.http2.frame.FrameType;
import com.firefly.codec.http2.frame.ResetFrame;
import com.firefly.utils.io.BufferUtils;

public class ResetGenerator extends FrameGenerator {
	public ResetGenerator(HeaderGenerator headerGenerator) {
		super(headerGenerator);
	}

	@Override
	public List generate(Frame frame) {
		ResetFrame resetFrame = (ResetFrame) frame;
		return Arrays.asList(generateReset(resetFrame.getStreamId(), resetFrame.getError()));
	}

	public ByteBuffer generateReset(int streamId, int error) {
		if (streamId < 0)
			throw new IllegalArgumentException("Invalid stream id: " + streamId);

		ByteBuffer header = generateHeader(FrameType.RST_STREAM, 4, Flags.NONE, streamId);
		header.putInt(error);
		BufferUtils.flipToFlush(header, 0);
		return header;
	}
}