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package com.firefly.client.http2;

import com.firefly.codec.http2.encode.Generator;
import com.firefly.codec.http2.frame.HeadersFrame;
import com.firefly.codec.http2.frame.PushPromiseFrame;
import com.firefly.codec.http2.stream.FlowControlStrategy;
import com.firefly.codec.http2.stream.HTTP2Session;
import com.firefly.codec.http2.stream.Stream;
import com.firefly.codec.http2.stream.StreamSPI;
import com.firefly.utils.concurrent.Callback;
import com.firefly.utils.concurrent.Promise;
import com.firefly.utils.concurrent.Scheduler;
import com.firefly.utils.log.Log;
import com.firefly.utils.log.LogFactory;

public class HTTP2ClientSession extends HTTP2Session {
	private static Log log = LogFactory.getInstance().getLog("firefly-system");

	public HTTP2ClientSession(Scheduler scheduler, com.firefly.net.Session endPoint, Generator generator,
			Listener listener, FlowControlStrategy flowControl, int streamIdleTimeout) {
		super(scheduler, endPoint, generator, listener, flowControl, 1, streamIdleTimeout);
	}

	public static HTTP2ClientSession initSessionForUpgradingHTTP2(Scheduler scheduler, com.firefly.net.Session endPoint,
			Generator generator, Listener listener, FlowControlStrategy flowControl, int initialStreamId,
			int streamIdleTimeout, final Promise initStream, final Stream.Listener initStreamListener) {
		HTTP2ClientSession session = new HTTP2ClientSession(scheduler, endPoint, generator, listener, flowControl,
				initialStreamId, streamIdleTimeout);
		final StreamSPI stream = session.createLocalStream(1, initStream);
		stream.setListener(initStreamListener);
		stream.updateClose(true, true);
		initStream.succeeded(stream);
		return session;
	}

	private HTTP2ClientSession(Scheduler scheduler, com.firefly.net.Session endPoint, Generator generator,
			Listener listener, FlowControlStrategy flowControl, int initialStreamId, int streamIdleTimeout) {
		super(scheduler, endPoint, generator, listener, flowControl, initialStreamId, streamIdleTimeout);
	}

	@Override
	public void onHeaders(HeadersFrame frame) {
		if (log.isDebugEnabled())
			log.debug("Received {}", frame);

		int streamId = frame.getStreamId();
		StreamSPI stream = getStream(streamId);
		if (stream == null) {
			if (log.isDebugEnabled())
				log.debug("Ignoring {}, stream #{} not found", frame, streamId);
		} else {
			stream.process(frame, Callback.NOOP);
			notifyHeaders(stream, frame);
		}
	}

	private void notifyHeaders(StreamSPI stream, HeadersFrame frame) {
		Stream.Listener listener = stream.getListener();
		if (listener == null)
			return;
		try {
			listener.onHeaders(stream, frame);
		} catch (Throwable x) {
			log.error("Failure while notifying listener {}", x, listener);
		}
	}

	@Override
	public void onPushPromise(PushPromiseFrame frame) {
		if (log.isDebugEnabled())
			log.debug("Received {}", frame);

		int streamId = frame.getStreamId();
		int pushStreamId = frame.getPromisedStreamId();
		StreamSPI stream = getStream(streamId);
		if (stream == null) {
			if (log.isDebugEnabled())
				log.debug("Ignoring {}, stream #{} not found", frame, streamId);
		} else {
			StreamSPI pushStream = createRemoteStream(pushStreamId);
			pushStream.process(frame, Callback.NOOP);
			Stream.Listener listener = notifyPush(stream, pushStream, frame);
			pushStream.setListener(listener);
		}
	}

	private Stream.Listener notifyPush(StreamSPI stream, StreamSPI pushStream, PushPromiseFrame frame) {
		Stream.Listener listener = stream.getListener();
		if (listener == null)
			return null;
		try {
			return listener.onPush(pushStream, frame);
		} catch (Throwable x) {
			log.error("Failure while notifying listener {}", x, listener);
			return null;
		}
	}
}