/*
 * 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.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;

/**
 * Test case for {@link DoubleCoder}.
 */
@RunWith(JUnit4.class)
public class DoubleCoderTest {

  private static final Coder<Double> TEST_CODER = DoubleCoder.of();

  private static final List<Double> TEST_VALUES = Arrays.asList(
      0.0, -0.5, 0.5, 0.3, -0.3, 1.0, -43.89568740, 3.14159,
      Double.MAX_VALUE,
      Double.MIN_VALUE,
      Double.POSITIVE_INFINITY,
      Double.NEGATIVE_INFINITY,
      Double.NaN);

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

  /**
   * 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(
      "AAAAAAAAAAA",
      "v-AAAAAAAAA",
      "P-AAAAAAAAA",
      "P9MzMzMzMzM",
      "v9MzMzMzMzM",
      "P_AAAAAAAAA",
      "wEXypeJ9ODo",
      "QAkh-fAbhm4",
      "f-________8",
      "AAAAAAAAAAE",
      "f_AAAAAAAAA",
      "__AAAAAAAAA",
      "f_gAAAAAAAA");

  @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 Double");

    CoderUtils.encodeToBase64(TEST_CODER, null);
  }

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