/*
    * 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.IOException;
  import java.io.Reader;
  import java.io.StringReader;
  import java.io.StringWriter;
  import java.io.Writer;
  import java.nio.CharBuffer;
  
  import org.apache.commons.io.output.StringBuilderWriter;
  import org.apache.commons.io.test.ThrowOnCloseReader;
  import org.apache.commons.io.test.ThrowOnCloseWriter;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link TeeReader}.
   */
  public class TeeReaderTest  {
  
      private StringBuilderWriter output;
  
      private Reader tee;
  
      @BeforeEach
      public void setUp() {
          final Reader input = new CharSequenceReader("abc");
          output = new StringBuilderWriter();
          tee = new TeeReader(input, output);
      }
  
      /**
       * Tests that the main {@code Reader} is closed when closing the branch {@code Writer} throws an
       * exception on {@link TeeReader#close()}, if specified to do so.
       */
      @Test
      public void testCloseBranchIOException() throws Exception {
          final StringReader goodR = mock(StringReader.class);
          final Writer badW = new ThrowOnCloseWriter();
  
          final TeeReader nonClosingTr = new TeeReader(goodR, badW, false);
          nonClosingTr.close();
          verify(goodR).close();
  
          final TeeReader closingTr = new TeeReader(goodR, badW, true);
          assertThrows(IOException.class, closingTr::close);
          verify(goodR, times(2)).close();
      }
  
      /**
       * Tests that the branch {@code Writer} is closed when closing the main {@code Reader} throws an
       * exception on {@link TeeReader#close()}, if specified to do so.
       */
      @Test
      public void testCloseMainIOException() throws IOException {
          final Reader badR = new ThrowOnCloseReader();
          final StringWriter goodW = mock(StringWriter.class);
  
          final TeeReader nonClosingTr = new TeeReader(badR, goodW, false);
          assertThrows(IOException.class, nonClosingTr::close);
          verify(goodW, never()).close();
  
          final TeeReader closingTr = new TeeReader(badR, goodW, true);
          assertThrows(IOException.class, closingTr::close);
          verify(goodW).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());
     }
 
     @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());
     }
 
     @Test
     public void testReadNothing() {
         assertEquals("", output.toString());
     }
 
     @Test
     public void testReadOneChar() throws Exception {
         assertEquals('a', tee.read());
         assertEquals("a", output.toString());
     }
 
     @Test
     public void testReadToArray() throws Exception {
         final char[] buffer = new char[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());
     }
 
     @Test
     public void testReadToArrayWithOffset() throws Exception {
         final char[] buffer = new char[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());
     }
 
     @Test
     public void testReadToCharBuffer() throws Exception {
         final CharBuffer buffer = CharBuffer.allocate(8);
         buffer.position(1);
         assertEquals(3, tee.read(buffer));
         assertEquals(4, buffer.position());
         buffer.flip();
         buffer.position(1);
         assertEquals('a', buffer.charAt(0));
         assertEquals('b', buffer.charAt(1));
         assertEquals('c', buffer.charAt(2));
         assertEquals(-1, tee.read(buffer));
         assertEquals("abc", output.toString());
     }
 
     @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());
     }
 
 }