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package com.firefly.server.http2;

import java.util.Collections;
import java.util.Map;

import com.firefly.codec.http2.decode.ServerParser;
import com.firefly.codec.http2.encode.Generator;
import com.firefly.codec.http2.frame.ErrorCode;
import com.firefly.codec.http2.frame.Frame;
import com.firefly.codec.http2.frame.HeadersFrame;
import com.firefly.codec.http2.frame.PushPromiseFrame;
import com.firefly.codec.http2.frame.SettingsFrame;
import com.firefly.codec.http2.frame.WindowUpdateFrame;
import com.firefly.codec.http2.model.MetaData;
import com.firefly.codec.http2.stream.FlowControlStrategy;
import com.firefly.codec.http2.stream.HTTP2Session;
import com.firefly.codec.http2.stream.Session;
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.Scheduler;
import com.firefly.utils.log.Log;
import com.firefly.utils.log.LogFactory;

public class HTTP2ServerSession extends HTTP2Session implements ServerParser.Listener {
	private static Log log = LogFactory.getInstance().getLog("firefly-system");

	private final ServerSessionListener listener;

	public HTTP2ServerSession(Scheduler scheduler, com.firefly.net.Session endPoint, Generator generator,
			ServerSessionListener listener, FlowControlStrategy flowControl, int streamIdleTimeout) {
		super(scheduler, endPoint, generator, listener, flowControl, 2, streamIdleTimeout);
		this.listener = listener;
	}

	@Override
	public void onPreface() {
		// SPEC: send a SETTINGS frame upon receiving the preface.
        Map settings = notifyPreface(this);
        if (settings == null)
            settings = Collections.emptyMap();
        SettingsFrame settingsFrame = new SettingsFrame(settings, false);

        WindowUpdateFrame windowFrame = null;
        int sessionWindow = getInitialSessionRecvWindow() - FlowControlStrategy.DEFAULT_WINDOW_SIZE;
        if (sessionWindow > 0) {
            updateRecvWindow(sessionWindow);
            windowFrame = new WindowUpdateFrame(0, sessionWindow);
        }

        if (windowFrame == null)
            frames(null, Callback.NOOP, settingsFrame, Frame.EMPTY_ARRAY);
        else
            frames(null, Callback.NOOP, settingsFrame, windowFrame);
	}

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

		MetaData metaData = frame.getMetaData();
		if (metaData.isRequest()) {
			StreamSPI stream = createRemoteStream(frame.getStreamId());
			if (stream != null) {
				stream.process(frame, Callback.NOOP);
				Stream.Listener listener = notifyNewStream(stream, frame);
				stream.setListener(listener);
			}
		} else {
			onConnectionFailure(ErrorCode.INTERNAL_ERROR.code, "invalid_request");
		}
	}

	@Override
	public void onPushPromise(PushPromiseFrame frame) {
		onConnectionFailure(ErrorCode.PROTOCOL_ERROR.code, "push_promise");
	}

	private Map notifyPreface(Session session) {
		try {
			return listener.onPreface(session);
		} catch (Throwable x) {
			log.error("Failure while notifying listener {}", x, listener);
			return null;
		}
	}

	@Override
	public void onFrame(Frame frame) {
		switch (frame.getType()) {
		case PREFACE:
			onPreface();
			break;
		case SETTINGS:
			// SPEC: the required reply to this SETTINGS frame is the 101
			// response.
			onSettings((SettingsFrame) frame, false);
			break;
		case HEADERS:
			onHeaders((HeadersFrame) frame);
			break;
		default:
			super.onFrame(frame);
			break;
		}
	}
}