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/*
 * Copyright (c) 2014 Google, Inc.
 *
 * 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 com.google.common.truth;

import com.google.common.primitives.Doubles;

/** Math utilities to be shared by numeric subjects. */
public final class MathUtil {
  private MathUtil() {}

  /**
   * Returns true iff {@code left} and {@code right} are finite values within {@code tolerance} of
   * each other. Note that both this method and {@link #notEqualWithinTolerance} returns false if
   * either {@code left} or {@code right} is infinite or NaN.
   */
  public static boolean equalWithinTolerance(double left, double right, double tolerance) {
    return Math.abs(left - right) <= Math.abs(tolerance);
  }

  /**
   * Returns true iff {@code left} and {@code right} are finite values within {@code tolerance} of
   * each other. Note that both this method and {@link #notEqualWithinTolerance} returns false if
   * either {@code left} or {@code right} is infinite or NaN.
   */
  public static boolean equalWithinTolerance(float left, float right, float tolerance) {
    return equalWithinTolerance((double) left, (double) right, (double) tolerance);
  }

  /**
   * Returns true iff {@code left} and {@code right} are finite values not within {@code tolerance}
   * of each other. Note that both this method and {@link #equalWithinTolerance} returns false if
   * either {@code left} or {@code right} is infinite or NaN.
   */
  public static boolean notEqualWithinTolerance(double left, double right, double tolerance) {
    if (Doubles.isFinite(left) && Doubles.isFinite(right)) {
      return Math.abs(left - right) > Math.abs(tolerance);
    } else {
      return false;
    }
  }

  /**
   * Returns true iff {@code left} and {@code right} are finite values not within {@code tolerance}
   * of each other. Note that both this method and {@link #equalWithinTolerance} returns false if
   * either {@code left} or {@code right} is infinite or NaN.
   */
  public static boolean notEqualWithinTolerance(float left, float right, float tolerance) {
    return notEqualWithinTolerance((double) left, (double) right, (double) tolerance);
  }
}