Part-DB.Part-DB-server/src/Validator/Constraints/ValidPartLotValidator.php

<?php
/**
 * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
 *
 * Copyright (C) 2019 Jan Böhmer (https://github.com/jbtronics)
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

namespace App\Validator\Constraints;

use App\Entity\Parts\PartLot;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\Form\Exception\UnexpectedTypeException;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;

class ValidPartLotValidator extends ConstraintValidator
{
    protected $em;

    public function __construct(EntityManagerInterface $em)
    {
        $this->em = $em;
    }

    /**
     * Checks if the passed value is valid.
     *
     * @param mixed      $value      The value that should be validated
     * @param Constraint $constraint The constraint for the validation
     */
    public function validate($value, Constraint $constraint)
    {
        if (!$constraint instanceof ValidPartLot) {
            throw new UnexpectedTypeException($constraint, ValidPartLot::class);
        }

        if (!$value instanceof PartLot) {
            throw new UnexpectedTypeException($value, PartLot::class);
        }

        //We can only validate the values if we know the storelocation
        if ($value->getStorageLocation()) {
            $parts = $value->getStorageLocation()->getParts();

            //Check for isFull() attribute
            if ($value->getStorageLocation()->isFull()) {
                //Compare with saved amount value
                $db_lot = $this->em->getUnitOfWork()->getOriginalEntityData($value);

                //Amount increasment is not allowed
                if ($db_lot && $value->getAmount() > $db_lot['amount']) {
                    $this->context->buildViolation('validator.part_lot.location_full.no_increasment')
                        ->setParameter('{{ old_amount }}', $db_lot['amount'])
                        ->atPath('amount')->addViolation();
                }

                if (!$parts->contains($value->getPart())) {
                    $this->context->buildViolation('validator.part_lot.location_full')
                        ->atPath('storage_location')->addViolation();
                }
            }

            //Check for onlyExisting
            if ($value->getStorageLocation()->isLimitToExistingParts()) {
                if (!$parts->contains($value->getPart())) {
                    $this->context->buildViolation('validator.part_lot.only_existing')
                        ->atPath('storage_location')->addViolation();
                }
            }

            //Check for only single part
            if ($value->getStorageLocation()->isLimitToExistingParts()) {
                if (($parts->count() > 0) && !$parts->contains($value->getPart())) {
                    $this->context->buildViolation('validator.part_lot.single_part')
                        ->atPath('storage_location')->addViolation();
                }
            }
        }
    }
}