/*
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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
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
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   */
  
  package org.apache.hc.core5.http.impl.nio;
  
  import java.io.IOException;
  import java.nio.channels.SelectionKey;
  
  import org.apache.hc.core5.http.impl.nio.AbstractHttp1StreamDuplexer.CapacityWindow;
  import org.apache.hc.core5.reactor.IOSession;
  
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.mockito.Mock;
  import org.mockito.Mockito;
  import org.mockito.MockitoAnnotations;
  
  public class TestAbstractHttp1StreamDuplexerCapacityWindow {
  
      @Mock
      private IOSession ioSession;
  
      private AutoCloseable closeable;
  
      @BeforeEach
      public void prepareMocks() {
          closeable = MockitoAnnotations.openMocks(this);
      }
  
      @AfterEach
      public void releaseMocks() throws Exception {
          closeable.close();
      }
  
      @Test
      public void testWindowUpdate() throws IOException {
          final CapacityWindow window = new CapacityWindow(0, ioSession);
          window.update(1);
          Assertions.assertEquals(1, window.getWindow());
          Mockito.verify(ioSession).setEvent(Mockito.eq(SelectionKey.OP_READ));
          Mockito.verifyNoMoreInteractions(ioSession);
      }
  
      @Test
      public void testRemoveCapacity() {
          final CapacityWindow window = new CapacityWindow(1, ioSession);
          window.removeCapacity(1);
          Assertions.assertEquals(0, window.getWindow());
          Mockito.verify(ioSession).clearEvent(Mockito.eq(SelectionKey.OP_READ));
          Mockito.verifyNoMoreInteractions(ioSession);
      }
  
      @Test
      public void noReadsSetAfterWindowIsClosed() throws IOException {
          final CapacityWindow window = new CapacityWindow(1, ioSession);
          window.close();
          window.update(1);
          Mockito.verifyNoInteractions(ioSession);
      }
  
      @Test
      public void windowCannotUnderflow() {
          final CapacityWindow window = new CapacityWindow(Integer.MIN_VALUE, ioSession);
          window.removeCapacity(1);
          Assertions.assertEquals(Integer.MIN_VALUE, window.getWindow());
      }
  
      @Test
      public void windowCannotOverflow() throws IOException{
          final CapacityWindow window = new CapacityWindow(Integer.MAX_VALUE, ioSession);
          window.update(1);
          Assertions.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);
         Assertions.assertEquals(1, window.getWindow());
         Mockito.verifyNoInteractions(ioSession);
     }
 }