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<?php

/*
 * This file is part of Respect/Validation.
 *
 * (c) Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
 *
 * For the full copyright and license information, please view the "LICENSE.md"
 * file that was distributed with this source code.
 */

namespace Respect\Validation\Rules;

use DateTime;
use DateTimeInterface;

class Date extends AbstractRule
{
    public $format = null;

public function __construct($format = null)
    {
        $this->format = $format;
    }

public function validate($input)
    {
        if ($input instanceof DateTimeInterface
            || $input instanceof DateTime) {
            return true;
        }

if (!is_scalar($input)) {
            return false;
        }

$inputString = (string) $input;

if (is_null($this->format)) {
            return false !== strtotime($inputString);
        }

$exceptionalFormats = [
            'c' => 'Y-m-d\TH:i:sP',
            'r' => 'D, d M Y H:i:s O',
        ];

if (in_array($this->format, array_keys($exceptionalFormats))) {
            $this->format = $exceptionalFormats[$this->format];
        }

return $this->isValidForFormatProvided($input);
    }

private function isValidForFormatProvided($input)
    {
        $info = date_parse_from_format($this->format, $input);
        if (!$this->isParsable($info)) {
            return false;
        }

if ($this->hasDateFormat()) {
            return $this->hasValidDate($info);
        }

return true;
    }

private function isParsable(array $info)
    {
        return ($info['error_count'] === 0 && $info['warning_count'] === 0);
    }

private function hasDateFormat()
    {
        return preg_match('/[djSFmMnYy]/', $this->format) > 0;
    }

private function hasValidDate(array $info)
    {
        if ($info['day']) {
            return checkdate((int) $info['month'], $info['day'], (int) $info['year']);
        }

return checkdate($info['month'] ?: 1, $info['day'] ?: 1, $info['year'] ?: 1);
    }
}