/*
 * 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.geode.internal.util;

import static org.junit.Assert.*;

import java.nio.ByteBuffer;

import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;

import org.apache.geode.test.junit.categories.UnitTest;

@Category(UnitTest.class)
public class BytesJUnitTest {

  private ByteBuffer buf;

  @Before
  public void setUp() throws Exception {
    buf = ByteBuffer.allocate(8);
  }

  @Test
  public void testShort() {
    short[] val = {666, -1, Short.MIN_VALUE, 0, 12, Short.MAX_VALUE};
    for (int i = 0; i < val.length; i++) {
      buf.putShort(val[i]).flip();
      assertEquals(val[i], Bytes.toShort(buf.get(), buf.get()));

      buf.rewind();
    }
  }

  @Test
  public void testChar() {
    char[] val = {'a', 'b', 'c'};
    for (int i = 0; i < val.length; i++) {
      buf.putChar(val[i]).flip();
      assertEquals(val[i], Bytes.toChar(buf.get(), buf.get()));

      buf.rewind();
    }
  }

  @Test
  public void testUnsignedShort() {
    int[] val = {0, 1, Short.MAX_VALUE + 1, 2 * Short.MAX_VALUE};
    for (int i = 0; i < val.length; i++) {
      buf.put(Bytes.int2(val[i])).put(Bytes.int3(val[i])).flip();
      assertEquals(val[i], Bytes.toUnsignedShort(buf.get(), buf.get()));

      buf.rewind();
    }
  }

  @Test
  public void testInt() {
    int[] val = {666, -1, Integer.MIN_VALUE, 0, 1, Integer.MAX_VALUE};
    for (int i = 0; i < val.length; i++) {
      buf.putInt(val[i]).flip();
      assertEquals(val[i], Bytes.toInt(buf.get(), buf.get(), buf.get(), buf.get()));

      buf.rewind();

      byte[] bytes = new byte[4];
      Bytes.putInt(val[i], bytes, 0);
      assertEquals(val[i], Bytes.toInt(bytes[0], bytes[1], bytes[2], bytes[3]));
    }
  }

  @Test
  public void testLong() {
    long[] val = {666, -1, Long.MIN_VALUE, 0, 1, Long.MAX_VALUE};
    for (int i = 0; i < val.length; i++) {
      buf.putLong(val[i]).flip();
      assertEquals(val[i], Bytes.toLong(buf.get(), buf.get(), buf.get(), buf.get(), buf.get(),
          buf.get(), buf.get(), buf.get()));

      buf.rewind();
    }
  }

  @Test
  public void testVarint() {
    ByteBuffer buf = ByteBuffer.allocate(5);
    checkVarint(0, buf);

    // 1 byte
    checkVarint(1, buf);
    checkVarint(0x7f, buf);

    // 2 byte
    checkVarint(0x80, buf);
    checkVarint(0x7fff, buf);

    // 3 byte
    checkVarint(0x8000, buf);
    checkVarint(0x7fffff, buf);

    // 4 byte
    checkVarint(0x800000, buf);
    checkVarint(0x7fffffff, buf);
  }

  private void checkVarint(int v, ByteBuffer buf) {
    Bytes.putVarInt(v, buf);
    buf.rewind();

    int v2 = Bytes.getVarInt(buf);
    assertEquals(v, v2);
    buf.clear();
  }
}