<?php

namespace Akeneo\Tool\Bundle\ApiBundle\Checker;

use Akeneo\Channel\Infrastructure\Component\Model\ChannelInterface;
use Akeneo\Tool\Component\StorageUtils\Repository\IdentifiableObjectRepositoryInterface;
use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
use Symfony\Component\HttpKernel\Exception\UnprocessableEntityHttpException;

/**
 * @author    Olivier Soulet <olivier.soulet@akeneo.com>
 * @copyright 2017 Akeneo SAS (http://www.akeneo.com)
 * @license   http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0)
 */
class QueryParametersChecker implements QueryParametersCheckerInterface
{
    /** @var IdentifiableObjectRepositoryInterface */
    private $localeRepository;

    /** @var IdentifiableObjectRepositoryInterface */
    private $attributeRepository;

    /** @var IdentifiableObjectRepositoryInterface */
    private $categoryRepository;

    /** @var array */
    private $productFields;

    /**
     * @param IdentifiableObjectRepositoryInterface $localeRepository
     * @param IdentifiableObjectRepositoryInterface $attributeRepository
     * @param IdentifiableObjectRepositoryInterface $categoryRepository
     * @param array                                 $productFields
     */
    public function __construct(
        IdentifiableObjectRepositoryInterface $localeRepository,
        IdentifiableObjectRepositoryInterface $attributeRepository,
        IdentifiableObjectRepositoryInterface $categoryRepository,
        array $productFields
    ) {
        $this->localeRepository = $localeRepository;
        $this->attributeRepository = $attributeRepository;
        $this->categoryRepository = $categoryRepository;
        $this->productFields = $productFields;
    }

    /**
     * {@inheritdoc}
     */
    public function checkLocalesParameters(array $localeCodes, ChannelInterface $channel = null)
    {
        $localeCodes = array_map('trim', $localeCodes);
        $errors = [];
        foreach ($localeCodes as $localeCode) {
            $locale = $this->localeRepository->findOneByIdentifier($localeCode);
            if (null === $locale || !$locale->isActivated()) {
                $errors[] = $localeCode;
            }
        }

        if (!empty($errors)) {
            $plural = count($errors) > 1 ?
                'Locales "%s" do not exist or are not activated.' : 'Locale "%s" does not exist or is not activated.';
            throw new UnprocessableEntityHttpException(sprintf($plural, implode(', ', $errors)));
        }

        if (null !== $channel) {
            $diff = array_diff($localeCodes, $channel->getLocaleCodes());
            if ($diff) {
                $plural = sprintf(count($diff) > 1 ? 'Locales "%s" are' : 'Locale "%s" is', implode(', ', $diff));
                throw new UnprocessableEntityHttpException(
                    sprintf('%s not activated for the scope "%s".', $plural, $channel->getCode())
                );
            }
        }
    }

    /**
     * {@inheritdoc}
     */
    public function checkAttributesParameters(array $attributeCodes)
    {
        $errors = [];
        foreach ($attributeCodes as $attributeCode) {
            $attributeCode = trim($attributeCode);
            if (null === $this->attributeRepository->findOneByIdentifier($attributeCode)) {
                $errors[] = $attributeCode;
            }
        }

        if (!empty($errors)) {
            $plural = count($errors) > 1 ? 'Attributes "%s" do not exist.' : 'Attribute "%s" does not exist.';
            throw new UnprocessableEntityHttpException(sprintf($plural, implode(', ', $errors)));
        }
    }

    /**
     * {@inheritdoc}
     */
    public function checkPropertyParameters(string $property, string $operator)
    {
        if (!in_array($property, $this->productFields) && null === $this->attributeRepository->findOneByIdentifier($property)) {
            throw new UnprocessableEntityHttpException(
                sprintf(
                    'Filter on property "%s" is not supported or does not support operator "%s"',
                    $property,
                    $operator
                )
            );
        }
    }

    /**
     * {@inheritdoc}
     */
    public function checkCategoriesParameters(array $categories)
    {
        $errors = [];
        foreach ($categories as $category) {
            foreach ($category['value'] as $categoryCode) {
                $categoryCode = trim($categoryCode);
                if (null === $this->categoryRepository->findOneByIdentifier($categoryCode)) {
                    $errors[] = $categoryCode;
                }
            }
        }

        if (!empty($errors)) {
            $plural = count($errors) > 1 ? 'Categories "%s" do not exist.' : 'Category "%s" does not exist.';
            throw new UnprocessableEntityHttpException(sprintf($plural, implode(', ', $errors)));
        }
    }

    /**
     * {@inheritdoc}
     */
    public function checkCriterionParameters(string $searchString): array
    {
        $searchParameters = json_decode($searchString, true);

        if (null === $searchParameters) {
            throw new BadRequestHttpException('Search query parameter should be valid JSON.');
        }

        foreach ($searchParameters as $searchKey => $searchParameter) {
            if (!is_array($searchParameters) || !isset($searchParameter[0])) {
                throw new UnprocessableEntityHttpException(
                    sprintf(
                        'Structure of filter "%s" should respect this structure: %s',
                        $searchKey,
                        sprintf('{"%s":[{"operator": "my_operator", "value": "my_value"}]}', $searchKey)
                    )
                );
            }

            foreach ($searchParameter as $searchFilter) {
                if (!isset($searchFilter['operator'])) {
                    throw new UnprocessableEntityHttpException(
                        sprintf('Operator is missing for the property "%s".', $searchKey)
                    );
                }

                if (!is_string($searchFilter['operator'])) {
                    throw new UnprocessableEntityHttpException(
                        sprintf('Operator has to be a string, "%s" given.', gettype($searchFilter['operator']))
                    );
                }
            }
        }

        return $searchParameters;
    }
}