/*
    * 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.harmony.pack200;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.fail;
  
  import java.io.ByteArrayInputStream;
  import java.io.EOFException;
  import java.io.IOException;
  import java.util.stream.IntStream;
  import java.util.stream.Stream;
  
  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;
  
  /**
   * Tests for BHSDCodec
   */
  class BHSDCodecTest {
  
      static Stream<Arguments> encodeDecodeRange() {
          return IntStream.range(1, 116).mapToObj(Arguments::of);
      }
  
      @Test
      void testDeltaEncodings() throws IOException, Pack200Exception {
          final Codec c = Codec.UDELTA5;
          final int[] sequence = { 0, 2, 4, 2, 2, 4 };
          final byte[] encoded = c.encode(sequence);
          final int[] decoded = c.decodeInts(6, new ByteArrayInputStream(encoded));
          for (int i = 0; i < decoded.length; i++) {
              assertEquals(sequence[i], decoded[i]);
          }
      }
  
      @ParameterizedTest
      @MethodSource("encodeDecodeRange")
      void testEncodeDecode(final int i) throws IOException, Pack200Exception {
          final BHSDCodec codec = (BHSDCodec) CodecEncoding.getCodec(i, null, null);
  
          if (!codec.isDelta()) {
              // Test encode-decode with a selection of numbers within the
              // range of the codec
              final long largest = codec.largest();
              long smallest = codec.isSigned() ? codec.smallest() : 0;
              if (smallest < Integer.MIN_VALUE) {
                  smallest = Integer.MIN_VALUE;
              }
              final long difference = (largest - smallest) / 4;
              for (long j = smallest; j <= largest; j += difference) {
                  if (j > Integer.MAX_VALUE) {
                      break;
                  }
                  final byte[] encoded = codec.encode((int) j, 0);
                  long decoded = 0;
                  try {
                      decoded = codec.decode(new ByteArrayInputStream(encoded), 0);
                  } catch (final EOFException e) {
                      System.out.println(e);
                  }
                  if (j != decoded) {
                      fail("Failed with codec: " + i + ", " + codec + " expected: " + j + ", got: " + decoded);
                  }
              }
          }
  
          // Test encode-decode with 0
          assertEquals(0, codec.decode(new ByteArrayInputStream(codec.encode(0, 0)), 0));
      }
  
  }