/*
    * Copyright 2014 The Netty Project
    *
    * The Netty Project licenses this file to you 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:
    *
    *   https://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 io.netty5.testsuite.transport.socket;
  
  import io.netty5.bootstrap.Bootstrap;
  import io.netty5.bootstrap.ServerBootstrap;
  import io.netty5.buffer.api.Buffer;
  import io.netty5.util.Resource;
  import io.netty5.channel.Channel;
  import io.netty5.channel.ChannelHandlerContext;
  import io.netty5.channel.SimpleChannelInboundHandler;
  import io.netty5.util.concurrent.Future;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.TestInfo;
  import org.junit.jupiter.api.Timeout;
  
  import java.io.IOException;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  import java.util.concurrent.atomic.AtomicReference;
  
  import static io.netty5.buffer.api.DefaultBufferAllocators.preferredAllocator;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class SocketCancelWriteTest extends AbstractSocketTest {
      @Test
      @Timeout(value = 30000, unit = TimeUnit.MILLISECONDS)
      public void testCancelWrite(TestInfo testInfo) throws Throwable {
          run(testInfo, this::testCancelWrite);
      }
  
      public void testCancelWrite(ServerBootstrap sb, Bootstrap cb) throws Throwable {
          final TestHandler sh = new TestHandler();
          final TestHandler ch = new TestHandler();
          final Buffer a = preferredAllocator().allocate(1).writeByte((byte) 'a');
          final Buffer b = preferredAllocator().allocate(1).writeByte((byte) 'b');
          final Buffer c = preferredAllocator().allocate(1).writeByte((byte) 'c');
          final Buffer d = preferredAllocator().allocate(1).writeByte((byte) 'd');
          final Buffer e = preferredAllocator().allocate(1).writeByte((byte) 'e');
  
          cb.handler(ch);
          sb.childHandler(sh);
  
          Channel sc = sb.bind().asStage().get();
          Channel cc = cb.connect(sc.localAddress()).asStage().get();
  
          Future<Void> f = cc.write(a);
          assertTrue(f.cancel());
          cc.writeAndFlush(b);
          cc.write(c);
          Future<Void> f2 = cc.write(d);
          assertTrue(f2.cancel());
          cc.writeAndFlush(e);
  
          while (sh.counter.get() < 3) {
              if (sh.exception.get() != null) {
                  break;
              }
              if (ch.exception.get() != null) {
                  break;
              }
              try {
                  Thread.sleep(50);
              } catch (InterruptedException ignore) {
                  // Ignore.
              }
          }
          sh.channel.close().asStage().sync();
          ch.channel.close().asStage().sync();
          sc.close().asStage().sync();
  
          if (sh.exception.get() != null && !(sh.exception.get() instanceof IOException)) {
              throw sh.exception.get();
          }
          if (sh.exception.get() != null) {
              throw sh.exception.get();
          }
          if (ch.exception.get() != null && !(ch.exception.get() instanceof IOException)) {
              throw ch.exception.get();
          }
          if (ch.exception.get() != null) {
              throw ch.exception.get();
          }
          assertEquals(0, ch.counter.get());
         assertNull(ch.received);
         assertEquals(preferredAllocator().copyOf(new byte[] { 'b', 'c', 'e' }), sh.received);
         Resource.dispose(sh.received);
     }
 
     private static class TestHandler extends SimpleChannelInboundHandler<Buffer> {
         volatile Channel channel;
         final AtomicReference<Throwable> exception = new AtomicReference<>();
         final AtomicInteger counter = new AtomicInteger();
         Buffer received;
         @Override
         public void channelActive(ChannelHandlerContext ctx)
                 throws Exception {
             channel = ctx.channel();
         }
 
         @Override
         public void messageReceived(ChannelHandlerContext ctx, Buffer in) throws Exception {
             counter.getAndAdd(in.readableBytes());
             if (received == null) {
                 received = preferredAllocator().allocate(32);
             }
             received.writeBytes(in);
         }
 
         @Override
         public void channelExceptionCaught(ChannelHandlerContext ctx,
                                            Throwable cause) throws Exception {
             if (exception.compareAndSet(null, cause)) {
                 ctx.close();
             }
         }
     }
 }