<?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>
 */
class DateIntervalToStringTransformer implements DataTransformerInterface
{
    private $format;

    /**
     * Transforms a \DateInterval instance to a string.
     *
     * @see \DateInterval::format() for supported formats
     *
     * @param string $format The date format
     */
    public function __construct($format = 'P%yY%mM%dDT%hH%iM%sS')
    {
        $this->format = $format;
    }

    /**
     * Transforms a DateInterval object into a date string with the configured format.
     *
     * @param \DateInterval $value A DateInterval object
     *
     * @return string An ISO 8601 or relative date string like date interval presentation
     *
     * @throws UnexpectedTypeException if the given value is not a \DateInterval instance
     */
    public function transform($value)
    {
        if (null === $value) {
            return '';
        }
        if (!$value instanceof \DateInterval) {
            throw new UnexpectedTypeException($value, '\DateInterval');
        }

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

    /**
     * Transforms a date string in the configured format into a DateInterval object.
     *
     * @param string $value An ISO 8601 or date string like date interval presentation
     *
     * @return \DateInterval An instance of \DateInterval
     *
     * @throws UnexpectedTypeException       if the given value is not a string
     * @throws TransformationFailedException if the date interval could not be parsed
     */
    public function reverseTransform($value)
    {
        if (null === $value) {
            return;
        }
        if (!is_string($value)) {
            throw new UnexpectedTypeException($value, 'string');
        }
        if ('' === $value) {
            return;
        }
        if (!$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($string)
    {
        return preg_match('/^P(?=\w*(?:\d|%\w))(?:\d+Y|%[yY]Y)?(?:\d+M|%[mM]M)?(?:(?:\d+D|%[dD]D)|(?:\d+W|%[wW]W))?(?:T(?:\d+H|[hH]H)?(?:\d+M|[iI]M)?(?:\d+S|[sS]S)?)?$/', $string);
    }
}
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