<?php
/*
* This file is part of sebastian/comparator.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/

namespace SebastianBergmann\Comparator;

/**
* Compares DateTimeInterface instances for equality.
*/
class DateTimeComparator extends ObjectComparator
{
/**
* Returns whether the comparator can compare two values.
*
* @param mixed $expected The first value to compare
* @param mixed $actual The second value to compare
*
* @return bool
*/
public function accepts($expected, $actual)
{
return ($expected instanceof \DateTime || $expected instanceof \DateTimeInterface) &&
($actual instanceof \DateTime || $actual instanceof \DateTimeInterface);
}

/**
* Asserts that two values are equal.
*
* @param mixed $expected First value to compare
* @param mixed $actual Second value to compare
* @param float $delta Allowed numerical distance between two values to consider them equal
* @param bool $canonicalize Arrays are sorted before comparison when set to true
* @param bool $ignoreCase Case is ignored when set to true
* @param array $processed List of already processed elements (used to prevent infinite recursion)
*
* @throws ComparisonFailure
*/
public function assertEquals($expected, $actual, $delta = 0.0, $canonicalize = false, $ignoreCase = false, array &$processed = [])
{
/** @var \DateTimeInterface $expected */
/** @var \DateTimeInterface $actual */
$delta = new \DateInterval(\sprintf('PT%dS', \abs($delta)));

$actualClone = (clone $actual)
->setTimezone(new \DateTimeZone('UTC'));

$expectedLower = (clone $expected)
->setTimezone(new \DateTimeZone('UTC'))
->sub($delta);

$expectedUpper = (clone $expected)
->setTimezone(new \DateTimeZone('UTC'))
->add($delta);

if ($actualClone < $expectedLower || $actualClone > $expectedUpper) {
throw new ComparisonFailure(
$expected,
$actual,
$this->dateTimeToString($expected),
$this->dateTimeToString($actual),
false,
'Failed asserting that two DateTime objects are equal.'
);
}
}

/**
* Returns an ISO 8601 formatted string representation of a datetime or
* 'Invalid DateTimeInterface object' if the provided DateTimeInterface was not properly
* initialized.
*/
private function dateTimeToString(\DateTimeInterface $datetime): string
{
$string = $datetime->format('Y-m-d\TH:i:s.uO');

return $string ?: 'Invalid DateTimeInterface object';
}
}