/*
    * 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.compressors;
  
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.io.BufferedInputStream;
  import java.io.File;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.nio.file.Files;
  import java.util.Random;
  
  import org.apache.commons.compress.AbstractTest;
  import org.apache.commons.compress.compressors.snappy.FramedSnappyCompressorInputStream;
  import org.apache.commons.io.IOUtils;
  import org.junit.jupiter.api.Test;
  
  public final class FramedSnappyTest extends AbstractTest {
  
      @Test
      public void testDefaultExtraction() throws Exception {
          testUnarchive(FramedSnappyCompressorInputStream::new);
      }
  
      @Test
      public void testDefaultExtractionViaFactory() throws Exception {
          testUnarchive(is -> new CompressorStreamFactory().createCompressorInputStream(CompressorStreamFactory.SNAPPY_FRAMED, is));
      }
  
      @Test
      public void testDefaultExtractionViaFactoryAutodetection() throws Exception {
          testUnarchive(is -> new CompressorStreamFactory().createCompressorInputStream(is));
      }
  
      @Test
      public void testRoundtrip() throws Exception {
          testRoundtrip(getFile("test.txt"));
          testRoundtrip(getFile("bla.tar"));
          testRoundtrip(getFile("COMPRESS-256.7z"));
      }
  
      private void testRoundtrip(final File input) throws Exception {
          final File outputSz = newTempFile(input.getName() + ".sz");
          try (OutputStream os = Files.newOutputStream(outputSz.toPath());
                  CompressorOutputStream sos = new CompressorStreamFactory().createCompressorOutputStream("snappy-framed", os)) {
              Files.copy(input.toPath(), sos);
          }
          try (InputStream is = Files.newInputStream(input.toPath());
                  CompressorInputStream sis = new CompressorStreamFactory().createCompressorInputStream("snappy-framed",
                          Files.newInputStream(outputSz.toPath()))) {
              final byte[] expected = IOUtils.toByteArray(is);
              final byte[] actual = IOUtils.toByteArray(sis);
              assertArrayEquals(expected, actual);
          }
      }
  
      @Test
      public void testRoundtripWithOneBigWrite() throws Exception {
          final Random r = new Random();
          final File input = newTempFile("bigChunkTest");
          try (OutputStream fs = Files.newOutputStream(input.toPath())) {
              for (int i = 0; i < 1 << 17; i++) {
                  fs.write(r.nextInt(256));
              }
          }
          final File outputSz = newTempFile(input.getName() + ".sz");
          try (InputStream is = Files.newInputStream(input.toPath());
                  OutputStream os = Files.newOutputStream(outputSz.toPath());
                  CompressorOutputStream sos = new CompressorStreamFactory().createCompressorOutputStream("snappy-framed", os)) {
              final byte[] b = IOUtils.toByteArray(is);
              sos.write(b[0]);
              sos.write(b, 1, b.length - 1); // must be split into multiple compressed chunks
          }
          try (InputStream is = Files.newInputStream(input.toPath());
                  CompressorInputStream sis = new CompressorStreamFactory().createCompressorInputStream("snappy-framed",
                          Files.newInputStream(outputSz.toPath()))) {
              final byte[] expected = IOUtils.toByteArray(is);
              final byte[] actual = IOUtils.toByteArray(sis);
              assertArrayEquals(expected, actual);
          }
      }
 
     private void testUnarchive(final StreamWrapper<CompressorInputStream> wrapper) throws Exception {
         final File input = getFile("bla.tar.sz");
         final File output = newTempFile("bla.tar");
         try (InputStream is = Files.newInputStream(input.toPath())) {
             // the intermediate BufferedInputStream is there for mark
             // support in the autodetection test
             try (CompressorInputStream in = wrapper.wrap(new BufferedInputStream(is))) {
                 Files.copy(in, output.toPath());
                 assertEquals(995, in.getBytesRead());
             }
         }
         final File original = getFile("bla.tar");
         try (InputStream written = Files.newInputStream(output.toPath())) {
             try (InputStream orig = Files.newInputStream(original.toPath())) {
                 assertArrayEquals(IOUtils.toByteArray(written), IOUtils.toByteArray(orig));
             }
         }
     }
 }