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<?php

/**
 * This file is part of the Nette Framework (https://nette.org)
 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 */

declare(strict_types=1);

namespace Nette\Utils;

use Nette;

/**
 * Floating-point numbers comparison.
 */
class Floats
{
	use Nette\StaticClass;

private const Epsilon = 1e-10;

public static function isZero(float $value): bool
	{
		return abs($value) < self::Epsilon;
	}

public static function isInteger(float $value): bool
	{
		return abs(round($value) - $value) < self::Epsilon;
	}

/**
	 * Compare two floats. If $a < $b it returns -1, if they are equal it returns 0 and if $a > $b it returns 1
	 * @throws \LogicException if one of parameters is NAN
	 */
	public static function compare(float $a, float $b): int
	{
		if (is_nan($a) || is_nan($b)) {
			throw new \LogicException('Trying to compare NAN');

} elseif (!is_finite($a) && !is_finite($b) && $a === $b) {
			return 0;
		}

$diff = abs($a - $b);
		if (($diff < self::Epsilon || ($diff / max(abs($a), abs($b)) < self::Epsilon))) {
			return 0;
		}

return $a < $b ? -1 : 1;
	}

/**
	 * Returns true if $a = $b
	 * @throws \LogicException if one of parameters is NAN
	 */
	public static function areEqual(float $a, float $b): bool
	{
		return self::compare($a, $b) === 0;
	}

/**
	 * Returns true if $a < $b
	 * @throws \LogicException if one of parameters is NAN
	 */
	public static function isLessThan(float $a, float $b): bool
	{
		return self::compare($a, $b) < 0;
	}

/**
	 * Returns true if $a <= $b
	 * @throws \LogicException if one of parameters is NAN
	 */
	public static function isLessThanOrEqualTo(float $a, float $b): bool
	{
		return self::compare($a, $b) <= 0;
	}

/**
	 * Returns true if $a > $b
	 * @throws \LogicException if one of parameters is NAN
	 */
	public static function isGreaterThan(float $a, float $b): bool
	{
		return self::compare($a, $b) > 0;
	}

/**
	 * Returns true if $a >= $b
	 * @throws \LogicException if one of parameters is NAN
	 */
	public static function isGreaterThanOrEqualTo(float $a, float $b): bool
	{
		return self::compare($a, $b) >= 0;
	}
}