/*
    * 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
    *
    *      https://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.output;
  
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertSame;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import org.apache.commons.lang3.ArrayUtils;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link ProxyOutputStream}.
   */
  class ProxyOutputStreamTest {
  
      private ByteArrayOutputStream target;
  
      private ProxyOutputStream proxied;
  
      private final AtomicBoolean hitArray = new AtomicBoolean();
      private final AtomicBoolean hitArrayAt = new AtomicBoolean();
      private final AtomicBoolean hitInt = new AtomicBoolean();
  
      @BeforeEach
      public void setUp() {
          target = new ByteArrayOutputStream() {
  
              @Override
              public void write(final byte[] ba) {
                  hitArray.set(true);
                  super.write(ba);
              }
  
              @Override
              public void write(final byte[] b, final int off, final int len) {
                  hitArrayAt.set(true);
                  super.write(b, off, len);
              }
  
              @Override
              public synchronized void write(final int ba) {
                  hitInt.set(true);
                  super.write(ba);
              }
          };
          proxied = new ProxyOutputStream(target);
      }
  
      @Test
      void testBuilder() throws Exception {
          assertSame(target, new ProxyOutputStream.Builder().setOutputStream(target).get().unwrap());
      }
  
      @Test
      void testSetReference() throws Exception {
          assertFalse(hitArray.get());
          proxied.setReference(new ByteArrayOutputStream());
          proxied.write('y');
          assertFalse(hitArray.get());
          assertEquals(0, target.size());
          assertArrayEquals(ArrayUtils.EMPTY_BYTE_ARRAY, target.toByteArray());
      }
  
      @Test
      void testUnrwap() throws Exception {
          assertSame(target, proxied.unwrap());
      }
  
      @Test
      void testWriteByteArray() throws Exception {
          assertFalse(hitArray.get());
          proxied.write(new byte[] { 'y', 'z' });
          assertTrue(hitArray.get());
          assertEquals(2, target.size());
          assertArrayEquals(new byte[] { 'y', 'z' }, target.toByteArray());
      }
  
      @Test
     void testWriteByteArrayAt() throws Exception {
         assertFalse(hitArrayAt.get());
         proxied.write(new byte[] { 'y', 'z' }, 1, 1);
         assertTrue(hitArrayAt.get());
         assertEquals(1, target.size());
         assertArrayEquals(new byte[] { 'z' }, target.toByteArray());
     }
 
     @Test
     void testWriteByteArrayAtRepeat() throws Exception {
         // repeat -1
         proxied.writeRepeat(new byte[] { 'y', 'z' }, 1, 1, 0);
         assertFalse(hitArrayAt.get());
         hitArray.set(false);
         assertEquals(0, target.size());
         assertArrayEquals(new byte[] {}, target.toByteArray());
         // repeat 0
         proxied.writeRepeat(new byte[] { 'y', 'z' }, 1, 1, 0);
         assertFalse(hitArrayAt.get());
         hitArray.set(false);
         assertEquals(0, target.size());
         assertArrayEquals(new byte[] {}, target.toByteArray());
         // repeat 1
         proxied.writeRepeat(new byte[] { 'y', 'z' }, 1, 1, 1);
         assertTrue(hitArrayAt.get());
         hitArray.set(false);
         assertEquals(1, target.size());
         assertArrayEquals(new byte[] { 'z' }, target.toByteArray());
         // repeat 2
         proxied.writeRepeat(new byte[] { 'y', 'x' }, 1, 1, 2);
         assertTrue(hitArrayAt.get());
         assertEquals(3, target.size());
         assertArrayEquals(new byte[] { 'z', 'x', 'x' }, target.toByteArray());
     }
 
     @Test
     void testWriteByteArrayRepeat() throws Exception {
         // repeat -1
         proxied.writeRepeat(new byte[] { 'y', 'z' }, -1);
         assertFalse(hitArray.get());
         hitArray.set(false);
         assertEquals(0, target.size());
         assertArrayEquals(new byte[] {}, target.toByteArray());
         // repeat 0
         proxied.writeRepeat(new byte[] { 'y', 'z' }, 0);
         assertFalse(hitArray.get());
         hitArray.set(false);
         assertEquals(0, target.size());
         assertArrayEquals(new byte[] {}, target.toByteArray());
         // repeat 1
         proxied.writeRepeat(new byte[] { 'y', 'z' }, 1);
         assertTrue(hitArray.get());
         hitArray.set(false);
         assertEquals(2, target.size());
         assertArrayEquals(new byte[] { 'y', 'z' }, target.toByteArray());
         // repeat 2
         proxied.writeRepeat(new byte[] { 'y', 'z' }, 2);
         assertTrue(hitArray.get());
         assertEquals(6, target.size());
         assertArrayEquals(new byte[] { 'y', 'z', 'y', 'z' , 'y', 'z' }, target.toByteArray());
     }
 
     @Test
     void testWriteInt() throws Exception {
         assertFalse(hitInt.get());
         proxied.write('y');
         assertTrue(hitInt.get());
         assertEquals(1, target.size());
         assertEquals('y', target.toByteArray()[0]);
     }
 
     @Test
     void testWriteIntRepeat() throws Exception {
         // repeat -1
         assertFalse(hitInt.get());
         proxied.writeRepeat('y', -1);
         assertFalse(hitInt.get());
         assertEquals(0, target.size());
         assertArrayEquals(new byte[] {}, target.toByteArray());
         // repeat 0
         assertFalse(hitInt.get());
         proxied.writeRepeat('y', 0);
         assertFalse(hitInt.get());
         assertEquals(0, target.size());
         assertArrayEquals(new byte[] {}, target.toByteArray());
         // repeat 1
         assertFalse(hitInt.get());
         proxied.writeRepeat('y', 1);
         assertTrue(hitInt.get());
         hitInt.set(false);
         assertEquals(1, target.size());
         assertArrayEquals(new byte[] { 'y' }, target.toByteArray());
         // repeat 2
         assertFalse(hitInt.get());
         proxied.writeRepeat('z', 2);
         assertTrue(hitInt.get());
         hitInt.set(false);
         assertEquals(3, target.size());
         assertArrayEquals(new byte[] { 'y', 'z', 'z' }, target.toByteArray());
     }
 
     @Test
     void testWriteNullArrayProxiesToUnderlying() throws Exception {
         assertFalse(hitArray.get());
         final byte[] ba = null;
         assertThrows(NullPointerException.class, () -> target.write(ba));
         assertTrue(hitArray.get());
         assertThrows(NullPointerException.class, () -> proxied.write(ba));
         assertTrue(hitArray.get());
     }
 }