/*
 * 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.beam.sdk.coders;

import static org.hamcrest.Matchers.equalTo;
import static org.junit.Assert.assertThat;

import java.util.Arrays;
import java.util.BitSet;
import java.util.List;
import org.apache.beam.sdk.testing.CoderProperties;
import org.apache.beam.sdk.util.CoderUtils;
import org.apache.beam.sdk.values.TypeDescriptor;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link BitSetCoder}. */
@RunWith(JUnit4.class)
public class BitSetCoderTest {
  private static final Coder<BitSet> TEST_CODER = BitSetCoder.of();

  private static final List<BitSet> TEST_VALUES = Arrays.asList(
      BitSet.valueOf(new byte[]{0xa, 0xb, 0xc}),
      BitSet.valueOf(new byte[]{0xd, 0x3}),
      BitSet.valueOf(new byte[]{0xd, 0xe}),
      BitSet.valueOf(new byte[]{}));

  @Test
  public void testDecodeEncodeEquals() throws Exception {
    for (BitSet value : TEST_VALUES) {
      CoderProperties.coderDecodeEncodeEqual(TEST_CODER, value);
    }
  }

  @Test
  public void testRegisterByteSizeObserver() throws Exception {
    CoderProperties.testByteCount(ByteArrayCoder.of(), Coder.Context.OUTER,
        new byte[][]{{ 0xa, 0xb, 0xc }});

    CoderProperties.testByteCount(ByteArrayCoder.of(), Coder.Context.NESTED,
        new byte[][]{{ 0xa, 0xb, 0xc }, {}, {}, { 0xd, 0xe }, {}});
  }

  @Test
  public void testStructuralValueConsistentWithEquals() throws Exception {
    // We know that bi array coders are NOT compatible with equals
    // (aka injective w.r.t. Object.equals)
    for (BitSet value1 : TEST_VALUES) {
      for (BitSet value2 : TEST_VALUES) {
        CoderProperties.structuralValueConsistentWithEquals(TEST_CODER, value1, value2);
      }
    }
  }

  /**
   * Generated data to check that the wire format has not changed. To regenerate, see
   * {@link org.apache.beam.sdk.coders.PrintBase64Encodings}.
   */
  private static final List<String> TEST_ENCODINGS = Arrays.asList(
      "CgsM",
      "DQM",
      "DQ4",
      "");

  @Test
  public void testWireFormatEncode() throws Exception {
    CoderProperties.coderEncodesBase64(TEST_CODER, TEST_VALUES, TEST_ENCODINGS);
  }

  @Rule
  public ExpectedException thrown = ExpectedException.none();

  @Test
  public void encodeNullThrowsCoderException() throws Exception {
    thrown.expect(CoderException.class);
    thrown.expectMessage("cannot encode a null BitSet");

    CoderUtils.encodeToBase64(TEST_CODER, null);
  }

  @Test
  public void testEncodedTypeDescriptor() throws Exception {
    assertThat(TEST_CODER.getEncodedTypeDescriptor(), equalTo(TypeDescriptor.of(BitSet.class)));
  }
}