/*
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    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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
   *
   *   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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
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   */
  
  package org.apache.hc.core5.http.impl.nio;
  
  import org.apache.hc.core5.http.impl.nio.AbstractHttp1StreamDuplexer.CapacityWindow;
  import org.apache.hc.core5.reactor.IOSession;
  import org.junit.Before;
  import org.junit.Test;
  import org.mockito.Mock;
  
  import java.io.IOException;
  import java.nio.channels.SelectionKey;
  
  import static org.junit.Assert.assertEquals;
  import static org.mockito.ArgumentMatchers.eq;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.verifyNoMoreInteractions;
  import static org.mockito.Mockito.verifyZeroInteractions;
  import static org.mockito.MockitoAnnotations.initMocks;
  
  public class TestAbstractHttp1StreamDuplexerCapacityWindow {
      @Mock private IOSession ioSession;
  
      @Before
      public void before() {
          initMocks(this);
      }
  
      @Test
      public void testWindowUpdate() throws IOException {
          final CapacityWindow window = new CapacityWindow(0, ioSession);
          window.update(1);
          assertEquals(1, window.getWindow());
          verify(ioSession).setEvent(eq(SelectionKey.OP_READ));
          verifyNoMoreInteractions(ioSession);
      }
  
      @Test
      public void testRemoveCapacity() {
          final CapacityWindow window = new CapacityWindow(1, ioSession);
          window.removeCapacity(1);
          assertEquals(0, window.getWindow());
          verify(ioSession).clearEvent(eq(SelectionKey.OP_READ));
          verifyNoMoreInteractions(ioSession);
      }
  
      @Test
      public void noReadsSetAfterWindowIsClosed() throws IOException {
          final CapacityWindow window = new CapacityWindow(1, ioSession);
          window.close();
          window.update(1);
          verifyZeroInteractions(ioSession);
      }
  
      @Test
      public void windowCannotUnderflow() {
          final CapacityWindow window = new CapacityWindow(Integer.MIN_VALUE, ioSession);
          window.removeCapacity(1);
          assertEquals(Integer.MIN_VALUE, window.getWindow());
      }
  
      @Test
      public void windowCannotOverflow() throws IOException{
          final CapacityWindow window = new CapacityWindow(Integer.MAX_VALUE, ioSession);
          window.update(1);
          assertEquals(Integer.MAX_VALUE, window.getWindow());
      }
  
      @Test
      public void noChangesIfUpdateIsNonPositive() throws IOException {
          final CapacityWindow window = new CapacityWindow(1, ioSession);
          window.update(0);
          window.update(-1);
          assertEquals(1, window.getWindow());
         verifyZeroInteractions(ioSession);
     }
 }