/*
 * Copyright (C) 2022 Objectos Software LTDA.
 *
 * Licensed 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 library;

import br.com.objectos.testing.random.TestingRandom;
import java.util.Arrays;
import org.testng.Assert;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

public class ByteArraysTest {
  @Test(description = "ByteArrays.mismatch: for array lengths <= 7")
  public void mismatch() {
    test(-1, arr(), arr());
    test(-1, arr(1), arr(1));
    test(-1, arr(1, 2), arr(1, 2));
    test(-1, arr(1, 2, 3), arr(1, 2, 3));

    test(0, arr(), arr(1));
    test(0, arr(), arr(1, 2));
    test(0, arr(1), arr());
    test(0, arr(1, 2), arr());
    test(0, arr(3), arr(5));
    test(0, arr(3), arr(5, 6));
    test(0, arr(3, 4), arr(5, 6));
    test(0, arr(3, 4, 5), arr(5, 6));

    test(1, arr(1, 2), arr(1));
    test(1, arr(1, 2, 3), arr(1));
    test(1, arr(9), arr(9, 8, 7));

    test(2, arr(1, 2, 3), arr(1, 2));
    test(2, arr(1, 2, 3, 4), arr(1, 2));
    test(2, arr(1, 2, 3, 4), arr(1, 2, 9));
    test(2, arr(9, 8), arr(9, 8, 7));
  }

  @DataProvider
  public Object[][] mismatchParam() {
    Object[][] result;
    result = new Object[63][];

    for (int i = 0; i < result.length; i++) {
      result[i] = new Object[] {i + 1};
    }

    return result;
  }

  @Test(
      description = "ByteArrays.mismatch: array length 0 < len <= 64 ",
      dataProvider = "mismatchParam")
  public void mismatchParam(int len) {
    byte[] a;
    a = TestingRandom.nextBytes(len);

    byte[] b;
    b = Arrays.copyOf(a, len);

    test(-1, a, a);
    test(-1, a, b);
    test(-1, b, a);

    b = Arrays.copyOf(a, len + 1);

    test(len, a, b);
    test(len, b, a);

    b[0] = (byte) (a[0] + 1);

    test(0, a, b);
    test(0, b, a);

    b[0] = a[0];
    b[len - 1] = (byte) (a[len - 1] + 1);

    test(len - 1, a, b);
    test(len - 1, b, a);
  }

  private byte[] arr(int... values) {
    byte[] arr;
    arr = new byte[values.length];

    for (int i = 0; i < arr.length; i++) {
      arr[i] = (byte) values[i];
    }

    return arr;
  }

  private void test(int expected, byte[] a, byte[] b) {
    int result;
    result = ByteArrays.mismatch(a, b);

    Assert.assertEquals(result, expected);
  }
}