<?php

declare(strict_types=1);

namespace DigiComp\SettingValidator\Validation\Validator;

/*
 * This file is part of the DigiComp.SettingValidator package.
 *
 * (c) digital competence
 *
 * This package is Open Source Software. For the full copyright and license
 * information, please view the LICENSE file which was distributed with this
 * source code.
 */

use Neos\Eel\EelEvaluatorInterface;
use Neos\Eel\Exception as NeosEelException;
use Neos\Eel\Utility;
use Neos\Flow\Annotations as Flow;
use Neos\Flow\ObjectManagement\DependencyInjection\DependencyProxy;
use Neos\Flow\Validation\Exception\InvalidValidationConfigurationException;
use Neos\Flow\Validation\Exception\NoSuchValidatorException;
use Neos\Flow\Validation\Validator\AbstractValidator;
use Neos\Flow\Validation\ValidatorResolver;

class ConditionalValidator extends AbstractValidator
{
    /**
     * @Flow\Inject
     * @var EelEvaluatorInterface
     */
    protected $eelEvaluator;

    /**
     * @Flow\Inject
     * @var ValidatorResolver
     */
    protected $validatorResolver;

    /**
     * @inheritDoc
     */
    protected $supportedOptions = [
        'conditions' => [[], 'List of entries with "condition" (eel expression) and "validators" (list of validators).', 'array', true],
        'fallbackValidators' => [[], 'List of validators that is used if no condition matched.', 'array'],
        'validationGroups' => [['Default'], 'Same as "Validation Groups" of Flow Framework', 'array'],
    ];

    /**
     * @inheritDoc
     * @throws InvalidValidationConfigurationException
     * @throws NeosEelException
     * @throws NoSuchValidatorException
     */
    protected function isValid($value): void
    {
        $validatorConfigs = [];

        $hasMatch = false;

        foreach ($this->options['conditions'] as $condition) {
            if ($this->eelEvaluator instanceof DependencyProxy) {
                $this->eelEvaluator->_activateDependency();
            }

            if (!Utility::evaluateEelExpression($condition['condition'], $this->eelEvaluator, ['this' => $value])) {
                continue;
            }

            $hasMatch = true;

            foreach ($condition['validators'] as $validator => $options) {
                if ($options === null) {
                    continue;
                }

                $validatorConfigs[] = [
                    'validator' => $validator,
                    'options' => $options,
                ];
            }
        }

        if (!$hasMatch) {
            foreach ($this->options['fallbackValidators'] as $validator => $options) {
                if ($options === null) {
                    continue;
                }

                $validatorConfigs[] = [
                    'validator' => $validator,
                    'options' => $options,
                ];
            }
        }

        foreach ($validatorConfigs as $validatorConfig) {
            if (!$this->doesValidationGroupsMatch($validatorConfig)) {
                continue;
            }

            $this->handleValidationGroups($validatorConfig);

            $validator = $this->validatorResolver->createValidator(
                $validatorConfig['validator'],
                $validatorConfig['options']
            );

            if ($validator === null) {
                throw new InvalidValidationConfigurationException(
                    \sprintf(
                        'Validator "%s" could not be resolved. Check your Validation.yaml',
                        $validatorConfig['validator']
                    ),
                    1402326139
                );
            }

            $this->getResult()->merge($validator->validate($value));
        }
    }

    /**
     * Check whether at least one configured group does match, if any is configured.
     *
     * @param array $validatorConfig
     * @return bool
     */
    protected function doesValidationGroupsMatch(array $validatorConfig): bool
    {
        return !isset($validatorConfig['options']['validationGroups'])
            || \array_intersect(
                $validatorConfig['options']['validationGroups'],
                $this->options['validationGroups']
            ) !== [];
    }

    /**
     * Add validation groups for recursion if necessary.
     *
     * @param array $validatorConfig
     */
    protected function handleValidationGroups(array &$validatorConfig): void
    {
        if ($validatorConfig['validator'] === 'DigiComp.SettingValidator:Settings') {
            $validatorConfig['options']['validationGroups'] = $this->options['validationGroups'];
        } elseif (isset($validatorConfig['options']['validationGroups'])) {
            unset($validatorConfig['options']['validationGroups']);
        }
    }
}