<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
declare(strict_types=1);

namespace Magento\ReCaptchaWebapiGraphQl\Plugin;

use Magento\Framework\App\Request\Http as HttpRequest;
use Magento\Framework\GraphQl\Exception\GraphQlInputException;
use Magento\Framework\GraphQl\Query\ResolverInterface;
use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
use Magento\ReCaptchaValidationApi\Api\ValidatorInterface;
use Magento\ReCaptchaWebapiApi\Api\WebapiValidationConfigProviderInterface;
use Magento\ReCaptchaWebapiApi\Model\Data\EndpointFactory;
use Magento\Framework\GraphQl\Config\Element\Field;

/**
 * Validate ReCaptcha for GraphQl mutations.
 */
class GraphQlValidator
{
    /**
     * @var HttpRequest
     */
    private $request;

    /**
     * @var WebapiValidationConfigProviderInterface
     */
    private $configProvider;

    /**
     * @var ValidatorInterface
     */
    private $validator;

    /**
     * @var EndpointFactory
     */
    private $endpointFactory;

    /**
     * @param HttpRequest $request
     * @param WebapiValidationConfigProviderInterface $configProvider
     * @param ValidatorInterface $validator
     * @param EndpointFactory $endpointFactory
     */
    public function __construct(
        HttpRequest $request,
        WebapiValidationConfigProviderInterface $configProvider,
        ValidatorInterface $validator,
        EndpointFactory $endpointFactory
    ) {
        $this->request = $request;
        $this->configProvider = $configProvider;
        $this->validator = $validator;
        $this->endpointFactory = $endpointFactory;
    }

    /**
     * Validate ReCaptcha for mutations if needed.
     *
     * @param ResolverInterface $subject
     * @param Field $fieldInfo
     * @param mixed $context
     * @param ResolveInfo $resolveInfo
     * @throws GraphQlInputException
     * @return void
     *
     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
     */
    public function beforeResolve(
        ResolverInterface $subject,
        Field $fieldInfo,
        $context,
        ResolveInfo $resolveInfo
    ): void {
        if ($resolveInfo->operation->operation !== 'mutation') {
            return;
        }

        $reCaptchaConfig = $this->configProvider->getConfigFor(
            $this->endpointFactory->create([
                'class' => ltrim($fieldInfo->getResolver(), '\\'),
                'method' => 'resolve',
                'name' => $fieldInfo->getName()
            ])
        );
        if ($reCaptchaConfig
            && !$this->validator->isValid(
                (string)$this->request->getHeader('X-ReCaptcha'),
                $reCaptchaConfig
            )->isValid()
        ) {
            throw new GraphQlInputException(__('ReCaptcha validation failed, please try again'));
        }
    }
}