<?php

/**
 * OAI-PMH 2.0 Data Provider
 * Copyright (C) 2023 Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace OCC\OaiPmh2;

use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\Exception\ValidationFailedException;
use Symfony\Component\Validator\Validation;

/**
 * Base class for all Doctrine/ORM entities.
 *
 * @author Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>
 * @package opencultureconsulting/oai-pmh2
 */
abstract class Entity
{
    /**
     * Check if a string does not contain any whitespaces.
     *
     * @param string $string The string
     *
     * @return string The validated string
     *
     * @throws ValidationFailedException
     */
    protected function validateNoWhitespace(string $string): string
    {
        $string = trim($string);
        $validator = Validation::createValidator();
        $violations = $validator->validate(
            $string,
            [
                new Assert\Regex([
                    'pattern' => '/\s/',
                    'match' => false,
                    'message' => 'This value contains whitespaces.'
                ]),
                new Assert\NotBlank()
            ]
        );
        if ($violations->count() > 0) {
            throw new ValidationFailedException(null, $violations);
        }
        return $string;
    }

    /**
     * Check if a string is a valid URI.
     *
     * @param string $uri The URI
     *
     * @return string The validated URI
     *
     * @throws ValidationFailedException
     */
    protected function validateUri(string $uri): string
    {
        $uri = trim($uri);
        $validator = Validation::createValidator();
        $violations = $validator->validate($uri, new Assert\Url());
        if ($violations->count() > 0) {
            throw new ValidationFailedException(null, $violations);
        }
        return $uri;
    }

    /**
     * Check if a string is well-formed XML.
     *
     * @param string $xml The XML string
     *
     * @return string The validated XML string
     *
     * @throws ValidationFailedException
     */
    protected function validateXml(string $xml): string
    {
        $validator = Validation::createValidator();
        $violations = $validator->validate(
            $xml,
            [
                new Assert\Type('string'),
                new Assert\NotBlank()
            ]
        );
        if ($violations->count() > 0
            or simplexml_load_string($xml) === false) {
            throw new ValidationFailedException(null, $violations);
        }
        return $xml;
    }
}