/*
 * Copyright (c) 2014 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at
 *     http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package org.asynchttpclient.netty.timeout;

import io.netty.util.Timeout;
import org.asynchttpclient.netty.NettyResponseFuture;
import org.asynchttpclient.netty.channel.Channels;
import org.asynchttpclient.netty.handler.StreamedResponsePublisher;
import org.asynchttpclient.netty.request.NettyRequestSender;
import org.asynchttpclient.util.StringBuilderPool;

import static org.asynchttpclient.util.DateUtils.unpreciseMillisTime;

public class ReadTimeoutTimerTask extends TimeoutTimerTask {

  private final long readTimeout;

  ReadTimeoutTimerTask(NettyResponseFuture<?> nettyResponseFuture,
                       NettyRequestSender requestSender,
                       TimeoutsHolder timeoutsHolder,
                       int readTimeout) {
    super(nettyResponseFuture, requestSender, timeoutsHolder);
    this.readTimeout = readTimeout;
  }

  public void run(Timeout timeout) {

    if (done.getAndSet(true) || requestSender.isClosed())
      return;

    if (nettyResponseFuture.isDone()) {
      timeoutsHolder.cancel();
      return;
    }

    long now = unpreciseMillisTime();

    long currentReadTimeoutInstant = readTimeout + nettyResponseFuture.getLastTouch();
    long durationBeforeCurrentReadTimeout = currentReadTimeoutInstant - now;

    if (durationBeforeCurrentReadTimeout <= 0L && !isReactiveWithNoOutstandingRequest()) {
      // idleConnectTimeout reached
      StringBuilder sb = StringBuilderPool.DEFAULT.stringBuilder().append("Read timeout to ");
      appendRemoteAddress(sb);
      String message = sb.append(" after ").append(readTimeout).append(" ms").toString();
      long durationSinceLastTouch = now - nettyResponseFuture.getLastTouch();
      expire(message, durationSinceLastTouch);
      // cancel request timeout sibling
      timeoutsHolder.cancel();

    } else {
      done.set(false);
      timeoutsHolder.startReadTimeout(this);
    }
  }

  private boolean isReactiveWithNoOutstandingRequest() {
    Object attribute = Channels.getAttribute(nettyResponseFuture.channel());
    return attribute instanceof StreamedResponsePublisher &&
            !((StreamedResponsePublisher) attribute).hasOutstandingRequest();
  }
}
