<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Form\Extension\Core\DataTransformer;

use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\TransformationFailedException;
use Symfony\Component\Form\Exception\UnexpectedTypeException;

/**
 * Transforms between a date string and a DateInterval object.
 *
 * @author Steffen Roßkamp <steffen.rosskamp@gimmickmedia.de>
 *
 * @implements DataTransformerInterface<\DateInterval, string>
 */
class DateIntervalToStringTransformer implements DataTransformerInterface
{
    /**
     * Transforms a \DateInterval instance to a string.
     *
     * @see \DateInterval::format() for supported formats
     *
     * @param string $format The date format
     */
    public function __construct(
        private string $format = 'P%yY%mM%dDT%hH%iM%sS',
    ) {
    }

    public function transform(mixed $value): string
    {
        if (null === $value) {
            return '';
        }
        if (!$value instanceof \DateInterval) {
            throw new UnexpectedTypeException($value, \DateInterval::class);
        }

        return $value->format($this->format);
    }

    public function reverseTransform(mixed $value): ?\DateInterval
    {
        if (null === $value) {
            return null;
        }
        if (!\is_string($value)) {
            throw new UnexpectedTypeException($value, 'string');
        }
        if ('' === $value) {
            return null;
        }
        if (!$this->isISO8601($value)) {
            throw new TransformationFailedException('Non ISO 8601 date strings are not supported yet.');
        }
        $valuePattern = '/^'.preg_replace('/%([yYmMdDhHiIsSwW])(\w)/', '(?P<$1>\d+)$2', $this->format).'$/';
        if (!preg_match($valuePattern, $value)) {
            throw new TransformationFailedException(\sprintf('Value "%s" contains intervals not accepted by format "%s".', $value, $this->format));
        }
        try {
            $dateInterval = new \DateInterval($value);
        } catch (\Exception $e) {
            throw new TransformationFailedException($e->getMessage(), $e->getCode(), $e);
        }

        return $dateInterval;
    }

    private function isISO8601(string $string): bool
    {
        return preg_match('/^P(?=\w*(?:\d|%\w))(?:\d+Y|%[yY]Y)?(?:\d+M|%[mM]M)?(?:(?:\d+D|%[dD]D)|(?:\d+W|%[wW]W))?(?:T(?:\d+H|[hH]H)?(?:\d+M|[iI]M)?(?:\d+S|[sS]S)?)?$/', $string);
    }
}