/*
    *  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.compress.archivers.zip;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.ArgumentMatchers.eq;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.times;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.when;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.channels.FileChannel;
  import java.nio.channels.SeekableByteChannel;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.StandardOpenOption;
  
  import org.apache.commons.compress.AbstractTempDirTest;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link SeekableChannelRandomAccessOutputStream}.
   */
  public class SeekableChannelRandomAccessOutputStreamTest extends AbstractTempDirTest {
  
      @Test
      public void testInitialization() throws IOException {
          final Path file = newTempPath("testChannel");
          try (SeekableChannelRandomAccessOutputStream stream = new SeekableChannelRandomAccessOutputStream(
                  Files.newByteChannel(file, StandardOpenOption.CREATE, StandardOpenOption.WRITE))) {
              assertEquals(0, stream.position());
          }
      }
  
      @Test
      public void testWrite() throws IOException {
          final FileChannel channel = mock(FileChannel.class);
          final SeekableChannelRandomAccessOutputStream stream = new SeekableChannelRandomAccessOutputStream(channel);
  
          when(channel.position()).thenReturn(11L);
          when(channel.write((ByteBuffer) any())).thenAnswer(answer -> {
              ((ByteBuffer) answer.getArgument(0)).position(5);
              return 5;
          }).thenAnswer(answer -> {
              ((ByteBuffer) answer.getArgument(0)).position(6);
              return 6;
          });
  
          stream.write("hello".getBytes(StandardCharsets.UTF_8));
          stream.write("world\n".getBytes(StandardCharsets.UTF_8));
  
          verify(channel, times(2)).write((ByteBuffer) any());
  
          assertEquals(11, stream.position());
      }
  
      @Test
      public void testWriteFullyAt_whenFullAtOnce_thenSucceed() throws IOException {
          final SeekableByteChannel channel = mock(SeekableByteChannel.class);
          final SeekableChannelRandomAccessOutputStream stream = new SeekableChannelRandomAccessOutputStream(channel);
  
          when(channel.position()).thenReturn(50L).thenReturn(60L);
          when(channel.write((ByteBuffer) any())).thenAnswer(answer -> {
              ((ByteBuffer) answer.getArgument(0)).position(5);
              return 5;
          }).thenAnswer(answer -> {
              ((ByteBuffer) answer.getArgument(0)).position(6);
              return 6;
          });
  
          stream.writeFully("hello".getBytes(StandardCharsets.UTF_8), 20);
          stream.writeFully("world\n".getBytes(StandardCharsets.UTF_8), 30);
  
          verify(channel, times(2)).write((ByteBuffer) any());
          verify(channel, times(1)).position(eq(50L));
          verify(channel, times(1)).position(eq(60L));
  
          assertEquals(60L, stream.position());
      }
  
     @Test
     public void testWriteFullyAt_whenFullButPartial_thenSucceed() throws IOException {
         final SeekableByteChannel channel = mock(SeekableByteChannel.class);
         final SeekableChannelRandomAccessOutputStream stream = new SeekableChannelRandomAccessOutputStream(channel);
 
         when(channel.position()).thenReturn(50L).thenReturn(60L);
         when(channel.write((ByteBuffer) any())).thenAnswer(answer -> {
             ((ByteBuffer) answer.getArgument(0)).position(3);
             return 3;
         }).thenAnswer(answer -> {
             ((ByteBuffer) answer.getArgument(0)).position(5);
             return 2;
         }).thenAnswer(answer -> {
             ((ByteBuffer) answer.getArgument(0)).position(6);
             return 6;
         });
 
         stream.writeFully("hello".getBytes(StandardCharsets.UTF_8), 20);
         stream.writeFully("world\n".getBytes(StandardCharsets.UTF_8), 30);
 
         verify(channel, times(3)).write((ByteBuffer) any());
         verify(channel, times(1)).position(eq(50L));
         verify(channel, times(1)).position(eq(60L));
 
         assertEquals(60L, stream.position());
     }
 
     @Test
     public void testWriteFullyAt_whenPartial_thenFail() throws IOException {
         final SeekableByteChannel channel = mock(SeekableByteChannel.class);
         final SeekableChannelRandomAccessOutputStream stream = new SeekableChannelRandomAccessOutputStream(channel);
 
         when(channel.position()).thenReturn(50L);
         when(channel.write((ByteBuffer) any())).thenAnswer(answer -> {
             ((ByteBuffer) answer.getArgument(0)).position(3);
             return 3;
         }).thenAnswer(answer -> 0);
 
         assertThrows(IOException.class, () -> stream.writeFully("hello".getBytes(StandardCharsets.UTF_8), 20));
 
         verify(channel, times(2)).write((ByteBuffer) any());
 
         assertEquals(50L, stream.position());
     }
 }