/*
    * ====================================================================
    * 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/>.
   *
   */
  
  package org.apache.hc.core5.http.impl.io;
  
  import java.io.ByteArrayInputStream;
  
  import org.apache.hc.core5.http.StreamClosedException;
  import org.apache.hc.core5.http.impl.BasicHttpTransportMetrics;
  import org.apache.hc.core5.http.io.SessionInputBuffer;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  /**
   * Unit tests for {@link IdentityInputStream}.
   */
  public class TestIdentityInputStream {
  
      @Test
      public void testBasicRead() throws Exception {
          final byte[] input = new byte[] {'a', 'b', 'c'};
          final ByteArrayInputStream inputStream = new ByteArrayInputStream(input);
          final SessionInputBuffer inBuffer = new SessionInputBufferImpl(16);
          final IdentityInputStream in = new IdentityInputStream(inBuffer, inputStream);
          final byte[] tmp = new byte[2];
          Assertions.assertEquals(2, in.read(tmp, 0, tmp.length));
          Assertions.assertEquals('a', tmp[0]);
          Assertions.assertEquals('b', tmp[1]);
          Assertions.assertEquals('c', in.read());
          Assertions.assertEquals(-1, in.read(tmp, 0, tmp.length));
          Assertions.assertEquals(-1, in.read());
          Assertions.assertEquals(-1, in.read(tmp, 0, tmp.length));
          Assertions.assertEquals(-1, in.read());
          in.close();
      }
  
      @Test
      public void testClosedCondition() throws Exception {
          final byte[] input = new byte[] {'a', 'b', 'c'};
          final ByteArrayInputStream inputStream = new ByteArrayInputStream(input);
          final SessionInputBuffer inBuffer = new SessionInputBufferImpl(16);
          final IdentityInputStream in = new IdentityInputStream(inBuffer, inputStream);
  
          in.close();
          in.close();
  
          Assertions.assertEquals(0, in.available());
          final byte[] tmp = new byte[2];
          Assertions.assertThrows(StreamClosedException.class, () -> in.read(tmp, 0, tmp.length));
          Assertions.assertThrows(StreamClosedException.class, () -> in.read());
      }
  
      @Test
      public void testAvailable() throws Exception {
          final byte[] input = new byte[] {'a', 'b', 'c'};
          final ByteArrayInputStream inputStream = new ByteArrayInputStream(input);
          final SessionInputBuffer inBuffer = new SessionInputBufferImpl(new BasicHttpTransportMetrics(), 16, 16, 1024, null);
          final IdentityInputStream in = new IdentityInputStream(inBuffer, inputStream);
          in.read();
          Assertions.assertEquals(2, in.available());
          in.close();
      }
  
      @Test
      public void testAvailableInStream() throws Exception {
          final byte[] input = new byte[] {'a', 'b', 'c', 'd', 'e', 'f'};
          final ByteArrayInputStream inputStream = new ByteArrayInputStream(input);
          final SessionInputBuffer inBuffer = new SessionInputBufferImpl(new BasicHttpTransportMetrics(), 16, 0, 1024, null);
          final IdentityInputStream in = new IdentityInputStream(inBuffer, inputStream);
          final byte[] tmp = new byte[3];
          Assertions.assertEquals(3, in.read(tmp));
          Assertions.assertEquals(3, in.available());
          in.close();
      }
  
 }