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/* Copyright 2022 predic8 GmbH, www.predic8.com

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License. */
package com.predic8.membrane.core.transport.http2;

import com.predic8.membrane.core.exchange.Exchange;
import com.predic8.membrane.core.http.Message;
import com.predic8.membrane.core.http.Response;
import com.predic8.membrane.core.transport.http.Connection;
import com.predic8.membrane.core.transport.http.HttpServerThreadFactory;
import com.predic8.membrane.core.transport.http2.frame.GoawayFrame;
import com.predic8.membrane.core.util.Util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.concurrent.GuardedBy;
import java.io.IOException;
import java.util.concurrent.*;

import static com.predic8.membrane.core.transport.http2.Http2ExchangeHandler.createHeadersFrames;
import static com.predic8.membrane.core.transport.http2.Http2ExchangeHandler.writeMessageBody;
import static com.predic8.membrane.core.transport.http2.Http2Logic.getRemoteAddr;
import static com.predic8.membrane.core.transport.http2.Http2ServerHandler.PREFACE;

public class Http2Client implements Runnable, AutoCloseable {
    private static final Logger LOG = LoggerFactory.getLogger(Http2Client.class);

    private static final ExecutorService executor = Util.createNewThreadPool();

    private final ConcurrentHashMap responses = new ConcurrentHashMap<>();
    private final Connection con;
    private final Http2Logic logic;
    @GuardedBy("this")
    private int reserved;

    private static class ResponseInfo {
        private final CountDownLatch cdl = new CountDownLatch(1);
        private Response response;
    }


    public Http2Client(Connection con, boolean showSSLExceptions) {
        this.con = con;
        this.logic = new Http2Logic(executor, con.socket, con.in, con.out, showSSLExceptions, new Http2MessageHandler() {
            @Override
            public Message createMessage() {
                Response response = new Response();
                response.getHeader().setValue("Transfer-Encoding", "chunked");
                return response;
            }

            @Override
            public void handleExchange(StreamInfo streamInfo, Message message, boolean showSSLExceptions, String remoteAddr) {
                ResponseInfo ri = responses.get(streamInfo.getStreamId());
                if (ri != null) {
                    ri.response = (Response) message;
                    ri.cdl.countDown();
                }
            }
        });

        Thread thread = new Thread(this);
        thread.start();
    }

    public Response doCall(Exchange exc, Connection con) throws IOException, InterruptedException {
        int streamId;
        synchronized(this) {
            if (reserved > 0)
                reserved--;
            streamId = logic.nextClientStreamId.getAndAccumulate(2, Integer::sum);
        }
        // TODO: check number of concurrent streams
        ResponseInfo ri = new ResponseInfo();
        responses.put(streamId, ri);
        try {
            StreamInfo streamInfo = new StreamInfo(streamId, logic.sender, logic.peerSettings, logic.ourSettings);
            logic.streams.put(streamId, streamInfo);

            logic.sender.send(streamId, (encoder, peerSettings) -> createHeadersFrames(exc.getRequest(), exc.getRequest().getHeader(), streamId, encoder, peerSettings, false));

            writeMessageBody(streamId, streamInfo, logic.sender, logic.peerSettings, logic.peerFlowControl, exc.getRequest());

            // TODO: handle error/exception
            ri.cdl.await();

            return ri.response;
        } finally {
            responses.remove(streamId);
        }
    }

    @Override
    public void run() {
        try {
            updateThreadName(true);
            LOG.debug("sending PREFACE.");
            con.out.write(PREFACE);

            logic.init();

            logic.handle();
        } catch (Exception e) {
            if (logic.receiving)
                e.printStackTrace();
            // TODO: notify threads waiting on responses
        } finally {
            updateThreadName(false);
        }
    }

    private void updateThreadName(boolean fromConnection) {
        if (fromConnection) {
            Thread.currentThread().setName("HTTP2 Client " +
                    getRemoteAddr(con.socket));
        } else {
            Thread.currentThread().setName(HttpServerThreadFactory.DEFAULT_THREAD_NAME);
        }
    }

    public Connection getConnection() {
        return con;
    }

    public boolean reserveStream() {
        int max = getMax();

        synchronized(this) {
            int current = logic.streams.size() + reserved;
            if (current < 0 || current >= max)
                return false;
            reserved += 1;
            return true;
        }
    }

    private int getMax() {
        int max = logic.peerSettings.getMaxConcurrentStreams();
        if (max == -1)
            return Integer.MAX_VALUE;
        return max;
    }

    public void close() {
        try {
            LOG.debug("stop receiving frames.");
            logic.receiving = false;
            logic.sender.send(GoawayFrame.construct(0, logic.nextClientStreamId.get(), 0));
            LOG.debug("terminating frame sender.");
            logic.sender.stop();
            try {
                logic.senderFuture.get();
            } catch (InterruptedException | ExecutionException e) {
                // do nothing
            }

            con.close();
        } catch (IOException e) {
            // do nothing
        }
    }

    public boolean isIdle() {
        for (StreamInfo value : logic.streams.values()) {
            if (value.getState() != StreamState.CLOSED)
                return false;
        }
        return true;
    }
}