/*
    * 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.compress.compressors;
  
  import static org.apache.commons.compress.AbstractTest.getFile;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertInstanceOf;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.io.BufferedInputStream;
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.file.Files;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Set;
  import java.util.stream.Stream;
  
  import org.apache.commons.compress.MemoryLimitException;
  import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
  import org.apache.commons.compress.compressors.deflate.DeflateCompressorInputStream;
  import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
  import org.apache.commons.compress.compressors.pack200.Pack200CompressorInputStream;
  import org.apache.commons.compress.compressors.xz.XZCompressorInputStream;
  import org.apache.commons.compress.compressors.zstandard.ZstdCompressorInputStream;
  import org.apache.commons.compress.utils.ByteUtils;
  import org.apache.commons.io.input.BrokenInputStream;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.Arguments;
  import org.junit.jupiter.params.provider.MethodSource;
  
  @SuppressWarnings("deprecation") // deliberately tests setDecompressConcatenated
  public final class DetectCompressorTest {
  
      static class TestData {
  
          final String fileName; // The multiple file name
          final char[] entryNames; // expected entries ...
          final CompressorStreamFactory factory; // ... when using this factory
          final boolean concat; // expected value for decompressConcatenated
  
          TestData(final String name, final char[] names, final CompressorStreamFactory factory, final boolean concat) {
              this.fileName = name;
              this.entryNames = names;
              this.factory = factory;
              this.concat = concat;
          }
      }
  
      private static final CompressorStreamFactory factoryTrue = new CompressorStreamFactory(true);
      private static final CompressorStreamFactory factoryFalse = new CompressorStreamFactory(false);
  
      // Must be static to allow use in the TestData entries
      private static final CompressorStreamFactory factorySetTrue;
      private static final CompressorStreamFactory factorySetFalse;
  
      static {
          factorySetTrue = new CompressorStreamFactory();
          factorySetTrue.setDecompressConcatenated(true);
          factorySetFalse = new CompressorStreamFactory();
          factorySetFalse.setDecompressConcatenated(false);
      }
  
      public static Stream<Arguments> getDetectLimitedByNameParams() {
          // @formatter:off
          return Stream.of(
              Arguments.of("bla.txt.bz2", CompressorStreamFactory.BZIP2),
              Arguments.of("bla.tgz", CompressorStreamFactory.GZIP),
              Arguments.of("bla.pack", CompressorStreamFactory.PACK200),
              Arguments.of("bla.tar.xz", CompressorStreamFactory.XZ),
              Arguments.of("bla.tar.deflatez", CompressorStreamFactory.DEFLATE),
              Arguments.of("bla.tar.lz4", CompressorStreamFactory.LZ4_FRAMED),
              Arguments.of("bla.tar.lzma", CompressorStreamFactory.LZMA),
              Arguments.of("bla.tar.sz", CompressorStreamFactory.SNAPPY_FRAMED),
              Arguments.of("bla.tar.Z", CompressorStreamFactory.Z),
              Arguments.of("bla.tar.zst", CompressorStreamFactory.ZSTANDARD)
          );
          // @formatter:on
     }
 
     final CompressorStreamFactory factory = new CompressorStreamFactory();
 
     private final TestData[] tests = {
         // @formatter:off
         new TestData("multiple.bz2", new char[] { 'a', 'b' }, factoryTrue, true),
         new TestData("multiple.bz2", new char[] { 'a', 'b' }, factorySetTrue, true),
         new TestData("multiple.bz2", new char[] { 'a' }, factoryFalse, false),
         new TestData("multiple.bz2", new char[] { 'a' }, factorySetFalse, false),
         new TestData("multiple.bz2", new char[] { 'a' }, factory, false),
 
         new TestData("multiple.gz", new char[] { 'a', 'b' }, factoryTrue, true),
         new TestData("multiple.gz", new char[] { 'a', 'b' }, factorySetTrue, true),
         new TestData("multiple.gz", new char[] { 'a' }, factoryFalse, false),
         new TestData("multiple.gz", new char[] { 'a' }, factorySetFalse, false),
         new TestData("multiple.gz", new char[] { 'a' }, factory, false),
 
         new TestData("multiple.xz", new char[] { 'a', 'b' }, factoryTrue, true),
         new TestData("multiple.xz", new char[] { 'a', 'b' }, factorySetTrue, true),
         new TestData("multiple.xz", new char[] { 'a' }, factoryFalse, false),
         new TestData("multiple.xz", new char[] { 'a' }, factorySetFalse, false),
         new TestData("multiple.xz", new char[] { 'a' }, factory, false),
         // @formatter:on
     };
 
     @SuppressWarnings("resource") // Caller closes.
     private CompressorInputStream createCompressorInputStream(final String resource) throws CompressorException, IOException {
         return factory.createCompressorInputStream(new BufferedInputStream(Files.newInputStream(getFile(resource).toPath())));
     }
 
     @SuppressWarnings("resource") // Caller closes.
     private CompressorInputStream createCompressorInputStream(final String resource, final CompressorStreamFactory factory)
             throws CompressorException, IOException {
         return factory.createCompressorInputStream(new BufferedInputStream(Files.newInputStream(getFile(resource).toPath())));
     }
 
     @SuppressWarnings("resource") // Caller closes.
     private CompressorInputStream createCompressorInputStream(final String resource, final Set<String> compressorNames)
             throws CompressorException, IOException {
         return factory.createCompressorInputStream(new BufferedInputStream(Files.newInputStream(getFile(resource).toPath())), compressorNames);
     }
 
     private InputStream createInputStream(final String fileName, final int memoryLimitInKb) throws Exception {
         final CompressorStreamFactory fac = new CompressorStreamFactory(true, memoryLimitInKb);
         final InputStream is = new BufferedInputStream(Files.newInputStream(getFile(fileName).toPath()));
         try {
             return fac.createCompressorInputStream(is);
         } catch (final CompressorException e) {
             if (e.getCause() != null && e.getCause() instanceof Exception) {
                 // unwrap cause to reveal MemoryLimitException
                 throw (Exception) e.getCause();
             }
             throw e;
         }
 
     }
 
     private String detect(final String testFileName) throws IOException, CompressorException {
         return detect(testFileName, null);
     }
 
     private String detect(final String testFileName, final Set<String> compressorNames) throws IOException, CompressorException {
         try (InputStream is = new BufferedInputStream(Files.newInputStream(getFile(testFileName).toPath()))) {
             return compressorNames != null ? CompressorStreamFactory.detect(is, compressorNames) : CompressorStreamFactory.detect(is);
         }
     }
 
     @Test
     void testCreateLimitedByName() throws Exception {
         try (CompressorInputStream bzip2 = createCompressorInputStream("bla.txt.bz2", Collections.singleton(CompressorStreamFactory.BZIP2))) {
             assertNotNull(bzip2);
             assertInstanceOf(BZip2CompressorInputStream.class, bzip2);
         }
 
         try (CompressorInputStream gzip = createCompressorInputStream("bla.tgz", Collections.singleton(CompressorStreamFactory.GZIP))) {
             assertNotNull(gzip);
             assertInstanceOf(GzipCompressorInputStream.class, gzip);
         }
 
         try (CompressorInputStream pack200 = createCompressorInputStream("bla.pack", Collections.singleton(CompressorStreamFactory.PACK200))) {
             assertNotNull(pack200);
             assertInstanceOf(Pack200CompressorInputStream.class, pack200);
         }
 
         try (CompressorInputStream xz = createCompressorInputStream("bla.tar.xz", Collections.singleton(CompressorStreamFactory.XZ))) {
             assertNotNull(xz);
             assertInstanceOf(XZCompressorInputStream.class, xz);
         }
 
         try (CompressorInputStream zlib = createCompressorInputStream("bla.tar.deflatez", Collections.singleton(CompressorStreamFactory.DEFLATE))) {
             assertNotNull(zlib);
             assertInstanceOf(DeflateCompressorInputStream.class, zlib);
         }
 
         try (CompressorInputStream zstd = createCompressorInputStream("bla.tar.zst", Collections.singleton(CompressorStreamFactory.ZSTANDARD))) {
             assertNotNull(zstd);
             assertInstanceOf(ZstdCompressorInputStream.class, zstd);
         }
     }
 
     @Test
     void testCreateLimitedByNameNotFound() throws Exception {
         assertThrows(CompressorException.class, () -> createCompressorInputStream("bla.txt.bz2", Collections.singleton(CompressorStreamFactory.BROTLI)));
         assertThrows(CompressorException.class, () -> createCompressorInputStream("bla.tgz", Collections.singleton(CompressorStreamFactory.Z)));
         assertThrows(CompressorException.class, () -> createCompressorInputStream("bla.pack", Collections.singleton(CompressorStreamFactory.SNAPPY_FRAMED)));
         assertThrows(CompressorException.class, () -> createCompressorInputStream("bla.tar.xz", Collections.singleton(CompressorStreamFactory.GZIP)));
         assertThrows(CompressorException.class, () -> createCompressorInputStream("bla.tar.deflatez", Collections.singleton(CompressorStreamFactory.PACK200)));
         assertThrows(CompressorException.class, () -> createCompressorInputStream("bla.tar.zst", Collections.singleton(CompressorStreamFactory.LZ4_FRAMED)));
     }
 
     @Test
     void testCreateWithAutoDetection() throws Exception {
         try (CompressorInputStream bzip2 = createCompressorInputStream("bla.txt.bz2")) {
             assertNotNull(bzip2);
             assertInstanceOf(BZip2CompressorInputStream.class, bzip2);
         }
 
         try (CompressorInputStream gzip = createCompressorInputStream("bla.tgz")) {
             assertNotNull(gzip);
             assertInstanceOf(GzipCompressorInputStream.class, gzip);
         }
 
         try (CompressorInputStream pack200 = createCompressorInputStream("bla.pack")) {
             assertNotNull(pack200);
             assertInstanceOf(Pack200CompressorInputStream.class, pack200);
         }
 
         try (CompressorInputStream xz = createCompressorInputStream("bla.tar.xz")) {
             assertNotNull(xz);
             assertInstanceOf(XZCompressorInputStream.class, xz);
         }
 
         try (CompressorInputStream zlib = createCompressorInputStream("bla.tar.deflatez")) {
             assertNotNull(zlib);
             assertInstanceOf(DeflateCompressorInputStream.class, zlib);
         }
 
         try (CompressorInputStream zstd = createCompressorInputStream("bla.tar.zst")) {
             assertNotNull(zstd);
             assertInstanceOf(ZstdCompressorInputStream.class, zstd);
         }
 
         assertThrows(CompressorException.class, () -> factory.createCompressorInputStream(new ByteArrayInputStream(ByteUtils.EMPTY_BYTE_ARRAY)));
     }
 
     @Test
     void testDetect() throws Exception {
         assertEquals(CompressorStreamFactory.BZIP2, detect("bla.txt.bz2"));
         assertEquals(CompressorStreamFactory.GZIP, detect("bla.tgz"));
         assertEquals(CompressorStreamFactory.PACK200, detect("bla.pack"));
         assertEquals(CompressorStreamFactory.XZ, detect("bla.tar.xz"));
         assertEquals(CompressorStreamFactory.DEFLATE, detect("bla.tar.deflatez"));
         assertEquals(CompressorStreamFactory.LZ4_FRAMED, detect("bla.tar.lz4"));
         assertEquals(CompressorStreamFactory.LZMA, detect("bla.tar.lzma"));
         assertEquals(CompressorStreamFactory.SNAPPY_FRAMED, detect("bla.tar.sz"));
         assertEquals(CompressorStreamFactory.Z, detect("bla.tar.Z"));
         assertEquals(CompressorStreamFactory.ZSTANDARD, detect("bla.tar.zst"));
 
         // make sure we don't oom on detect
         assertEquals(CompressorStreamFactory.Z, detect("COMPRESS-386"));
         assertEquals(CompressorStreamFactory.LZMA, detect("COMPRESS-382"));
 
         assertThrows(CompressorException.class,
                 () -> CompressorStreamFactory.detect(new BufferedInputStream(new ByteArrayInputStream(ByteUtils.EMPTY_BYTE_ARRAY))));
 
         final IllegalArgumentException e = assertThrows(IllegalArgumentException.class, () -> CompressorStreamFactory.detect(null),
                 "shouldn't be able to detect null stream");
         assertEquals("Stream must not be null.", e.getMessage());
 
         final CompressorException ce = assertThrows(CompressorException.class,
                 () -> CompressorStreamFactory.detect(new BufferedInputStream(new BrokenInputStream())), "Expected IOException");
         assertEquals("Failed to read signature.", ce.getMessage());
     }
 
     @ParameterizedTest
     @MethodSource("getDetectLimitedByNameParams")
     void testDetectLimitedByName(final String filename, final String compressorName) throws Exception {
         assertEquals(compressorName, detect(filename, Collections.singleton(compressorName)));
     }
 
     @Test
     void testDetectLimitedByNameNotFound() throws Exception {
         final Set<String> compressorNames = Collections.singleton(CompressorStreamFactory.DEFLATE);
 
         assertThrows(CompressorException.class, () -> detect("bla.txt.bz2", compressorNames));
         assertThrows(CompressorException.class, () -> detect("bla.tgz", compressorNames));
         assertThrows(CompressorException.class, () -> detect("bla.pack", compressorNames));
         assertThrows(CompressorException.class, () -> detect("bla.tar.xz", compressorNames));
         assertThrows(CompressorException.class, () -> detect("bla.tar.deflatez", Collections.singleton(CompressorStreamFactory.BZIP2)));
         assertThrows(CompressorException.class, () -> detect("bla.tar.lz4", compressorNames));
         assertThrows(CompressorException.class, () -> detect("bla.tar.lzma", compressorNames));
         assertThrows(CompressorException.class, () -> detect("bla.tar.sz", compressorNames));
         assertThrows(CompressorException.class, () -> detect("bla.tar.Z", compressorNames));
         assertThrows(CompressorException.class, () -> detect("bla.tar.zst", compressorNames));
     }
 
     @Test
     void testDetectNullOrEmptyCompressorNames() throws Exception {
         assertThrows(IllegalArgumentException.class, () -> CompressorStreamFactory.detect(createCompressorInputStream("bla.txt.bz2"), (Set<String>) null));
         assertThrows(IllegalArgumentException.class, () -> CompressorStreamFactory.detect(createCompressorInputStream("bla.tgz"), new HashSet<>()));
     }
 
     @Test
     void testLZMAMemoryLimit() throws Exception {
         assertThrows(MemoryLimitException.class, () -> createInputStream("COMPRESS-382", 100));
     }
 
     @Test
     void testMultiples() throws Exception {
         for (int i = 0; i < tests.length; i++) {
             final TestData test = tests[i];
             final CompressorStreamFactory fac = test.factory;
             assertNotNull(fac, "Test entry " + i);
             assertEquals(test.concat, fac.getDecompressConcatenated(), "Test entry " + i);
             try (CompressorInputStream in = createCompressorInputStream(test.fileName, fac)) {
                 assertNotNull(in, "Test entry " + i);
                 for (final char entry : test.entryNames) {
                     assertEquals(entry, in.read(), "Test entry" + i);
                 }
                 assertEquals(0, in.available());
                 assertEquals(-1, in.read());
             }
         }
     }
 
     @Test
     void testOverride() {
         final CompressorStreamFactory fac1 = new CompressorStreamFactory();
         assertFalse(fac1.getDecompressConcatenated());
         fac1.setDecompressConcatenated(true);
         assertTrue(fac1.getDecompressConcatenated());
 
         final CompressorStreamFactory fac2 = new CompressorStreamFactory(false);
         assertFalse(fac2.getDecompressConcatenated());
         assertThrows(IllegalStateException.class, () -> fac2.setDecompressConcatenated(true), "Expected IllegalStateException");
 
         final CompressorStreamFactory fac3 = new CompressorStreamFactory(true);
         assertTrue(fac3.getDecompressConcatenated());
         assertThrows(IllegalStateException.class, () -> fac3.setDecompressConcatenated(true), "Expected IllegalStateException");
     }
 
     @Test
     void testXZMemoryLimitOnRead() throws Exception {
         // Even though the file is very small, the memory limit
         // has to be quite large (8296 KiB) because of the dictionary size
 
         // This is triggered on read(); not during initialization.
         // This test is here instead of the xz unit test to make sure
         // that the parameter is properly passed via the CompressorStreamFactory
         try (InputStream compressorIs = createInputStream("bla.tar.xz", 100)) {
             assertThrows(MemoryLimitException.class, () -> compressorIs.read());
         }
     }
 
     @Test
     void testXZMemoryLimitOnSkip() throws Exception {
         try (InputStream compressorIs = createInputStream("bla.tar.xz", 100)) {
             assertThrows(MemoryLimitException.class, () -> compressorIs.skip(10));
         }
     }
 
     @Test
     void testZMemoryLimit() throws Exception {
         assertThrows(MemoryLimitException.class, () -> createInputStream("COMPRESS-386", 100));
     }
 }