/*
    * Copyright 2016 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.channel.Channel;
  import io.netty5.channel.ChannelHandler;
  import io.netty5.channel.ChannelHandlerContext;
  import io.netty5.channel.ChannelInitializer;
  import io.netty5.channel.ChannelOption;
  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.Locale;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicReference;
  
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class SocketRstTest extends AbstractSocketTest {
      protected void assertRstOnCloseException(IOException cause, Channel clientChannel) {
          if (Locale.getDefault() == Locale.US || Locale.getDefault() == Locale.UK) {
              assertTrue(cause.getMessage().contains("reset") || cause.getMessage().contains("closed"),
                  "actual message: " + cause.getMessage());
          }
      }
  
      @Test
      @Timeout(value = 3000, unit = TimeUnit.MILLISECONDS)
      public void testSoLingerZeroCausesOnlyRstOnClose(TestInfo testInfo) throws Throwable {
          run(testInfo, this::testSoLingerZeroCausesOnlyRstOnClose);
      }
  
      public void testSoLingerZeroCausesOnlyRstOnClose(ServerBootstrap sb, Bootstrap cb) throws Throwable {
          final AtomicReference<Channel> serverChannelRef = new AtomicReference<>();
          final AtomicReference<Throwable> throwableRef = new AtomicReference<>();
          final CountDownLatch latch = new CountDownLatch(1);
          final CountDownLatch latch2 = new CountDownLatch(1);
          // SO_LINGER=0 means that we must send ONLY a RST when closing (not a FIN + RST).
          sb.childOption(ChannelOption.SO_LINGER, 0);
          sb.childHandler(new ChannelInitializer<>() {
              @Override
              protected void initChannel(Channel ch) throws Exception {
                  serverChannelRef.compareAndSet(null, ch);
                  latch.countDown();
              }
          });
          cb.handler(new ChannelInitializer<>() {
              @Override
              protected void initChannel(Channel ch) throws Exception {
                  ch.pipeline().addLast(new ChannelHandler() {
                      @Override
                      public void channelExceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
                          throwableRef.compareAndSet(null, cause);
                      }
  
                      @Override
                      public void channelInactive(ChannelHandlerContext ctx) {
                          latch2.countDown();
                      }
                  });
              }
          });
          Channel sc = sb.bind().asStage().get();
          Channel cc = cb.connect(sc.localAddress()).asStage().get();
  
          // Wait for the server to get setup.
          latch.await();
  
          // The server has SO_LINGER=0 and so it must send a RST when close is called.
          serverChannelRef.get().close();
  
          // Wait for the client to get channelInactive.
          latch2.await();
  
          // Verify the client received a RST.
          Throwable cause = throwableRef.get();
          assertTrue(cause instanceof IOException,
                     "actual [type, message]: [" + cause.getClass() + ", " + cause.getMessage() + ']');
  
          assertRstOnCloseException((IOException) cause, cc);
     }
 
     @Test
     @Timeout(value = 3000, unit = TimeUnit.MILLISECONDS)
     public void testNoRstIfSoLingerOnClose(TestInfo testInfo) throws Throwable {
         run(testInfo, this::testNoRstIfSoLingerOnClose);
     }
 
     public void testNoRstIfSoLingerOnClose(ServerBootstrap sb, Bootstrap cb) throws Throwable {
         final AtomicReference<Channel> serverChannelRef = new AtomicReference<>();
         final AtomicReference<Throwable> throwableRef = new AtomicReference<>();
         final CountDownLatch latch = new CountDownLatch(1);
         final CountDownLatch latch2 = new CountDownLatch(1);
         sb.childHandler(new ChannelInitializer<>() {
             @Override
             protected void initChannel(Channel ch) throws Exception {
                 serverChannelRef.compareAndSet(null, ch);
                 latch.countDown();
             }
         });
         cb.handler(new ChannelInitializer<>() {
             @Override
             protected void initChannel(Channel ch) throws Exception {
                 ch.pipeline().addLast(new ChannelHandler() {
                     @Override
                     public void channelExceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
                         throwableRef.compareAndSet(null, cause);
                     }
 
                     @Override
                     public void channelInactive(ChannelHandlerContext ctx) {
                         latch2.countDown();
                     }
                 });
             }
         });
         Channel sc = sb.bind().asStage().get();
         cb.connect(sc.localAddress()).asStage().sync();
 
         // Wait for the server to get setup.
         latch.await();
 
         // The server has SO_LINGER=0 and so it must send a RST when close is called.
         serverChannelRef.get().close();
 
         // Wait for the client to get channelInactive.
         latch2.await();
 
         // Verify the client did not received a RST.
         assertNull(throwableRef.get());
     }
 }