/*
    * 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.
   */
  package org.apache.commons.io.input;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.never;
  import static org.mockito.Mockito.times;
  import static org.mockito.Mockito.verify;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.nio.charset.StandardCharsets;
  
  import org.apache.commons.io.test.ThrowOnCloseInputStream;
  import org.apache.commons.io.test.ThrowOnCloseOutputStream;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link TeeInputStream}.
   */
  public class TeeInputStreamTest  {
  
      private final String ASCII = StandardCharsets.US_ASCII.name();
  
      private InputStream tee;
  
      private ByteArrayOutputStream output;
  
      @BeforeEach
      public void setUp() throws Exception {
          final InputStream input = new ByteArrayInputStream("abc".getBytes(ASCII));
          output = new ByteArrayOutputStream();
          tee = new TeeInputStream(input, output);
      }
  
      /**
       * Tests that the main {@code InputStream} is closed when closing the branch {@code OutputStream} throws an
       * exception on {@link TeeInputStream#close()}, if specified to do so.
       */
      @Test
      public void testCloseBranchIOException() throws Exception {
          final ByteArrayInputStream goodIs = mock(ByteArrayInputStream.class);
          final OutputStream badOs = new ThrowOnCloseOutputStream();
  
          final TeeInputStream nonClosingTis = new TeeInputStream(goodIs, badOs, false);
          nonClosingTis.close();
          verify(goodIs).close();
  
          final TeeInputStream closingTis = new TeeInputStream(goodIs, badOs, true);
          assertThrows(IOException.class, closingTis::close);
          verify(goodIs, times(2)).close();
      }
  
      /**
       * Tests that the branch {@code OutputStream} is closed when closing the main {@code InputStream} throws an
       * exception on {@link TeeInputStream#close()}, if specified to do so.
       */
      @Test
      public void testCloseMainIOException() throws IOException {
          final InputStream badIs = new ThrowOnCloseInputStream();
          final ByteArrayOutputStream goodOs = mock(ByteArrayOutputStream.class);
  
          final TeeInputStream nonClosingTis = new TeeInputStream(badIs, goodOs, false);
          assertThrows(IOException.class, nonClosingTis::close);
          verify(goodOs, never()).close();
  
          final TeeInputStream closingTis = new TeeInputStream(badIs, goodOs, true);
          assertThrows(IOException.class, closingTis::close);
          verify(goodOs).close();
      }
  
      @Test
      public void testMarkReset() throws Exception {
          assertEquals('a', tee.read());
          tee.mark(1);
          assertEquals('b', tee.read());
          tee.reset();
          assertEquals('b', tee.read());
          assertEquals('c', tee.read());
         assertEquals(-1, tee.read());
         assertEquals("abbc", output.toString(ASCII));
     }
 
     @Test
     public void testReadEverything() throws Exception {
         assertEquals('a', tee.read());
         assertEquals('b', tee.read());
         assertEquals('c', tee.read());
         assertEquals(-1, tee.read());
         assertEquals("abc", output.toString(ASCII));
     }
 
     @Test
     public void testReadNothing() throws Exception {
         assertEquals("", output.toString(ASCII));
     }
 
     @Test
     public void testReadOneByte() throws Exception {
         assertEquals('a', tee.read());
         assertEquals("a", output.toString(ASCII));
     }
 
     @Test
     public void testReadToArray() throws Exception {
         final byte[] buffer = new byte[8];
         assertEquals(3, tee.read(buffer));
         assertEquals('a', buffer[0]);
         assertEquals('b', buffer[1]);
         assertEquals('c', buffer[2]);
         assertEquals(-1, tee.read(buffer));
         assertEquals("abc", output.toString(ASCII));
     }
 
     @Test
     public void testReadToArrayWithOffset() throws Exception {
         final byte[] buffer = new byte[8];
         assertEquals(3, tee.read(buffer, 4, 4));
         assertEquals('a', buffer[4]);
         assertEquals('b', buffer[5]);
         assertEquals('c', buffer[6]);
         assertEquals(-1, tee.read(buffer, 4, 4));
         assertEquals("abc", output.toString(ASCII));
     }
 
     @Test
     public void testSkip() throws Exception {
         assertEquals('a', tee.read());
         assertEquals(1, tee.skip(1));
         assertEquals('c', tee.read());
         assertEquals(-1, tee.read());
         assertEquals("ac", output.toString(ASCII));
     }
 
 }