<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM 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.
 *
 * EspoCRM 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 EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

namespace Espo\Services;

use Espo\Core\{
    Acl,
    Utils\Metadata as MetadataUtil,
};

use Espo\Entities\User;

class Metadata
{
    protected $acl;

    protected $metadata;

    protected $user;

    public function __construct(Acl $acl, MetadataUtil $metadata, User $user) {
        $this->acl = $acl;
        $this->metadata = $metadata;
        $this->user = $user;
    }

    public function getDataForFrontend()
    {
        $data = $this->metadata->getAllForFrontend();

        if (!$this->user->isAdmin()) {
            $scopeList = array_keys($this->metadata->get(['scopes'], []));

            foreach ($scopeList as $scope) {
                if (!$this->metadata->get(['scopes', $scope, 'entity'])) {
                    continue;
                }

                if (in_array($scope, ['Reminder'])) {
                    continue;
                }

                if (!$this->acl->check($scope)) {
                    unset($data->entityDefs->$scope);
                    unset($data->clientDefs->$scope);
                    unset($data->entityAcl->$scope);
                    unset($data->scopes->$scope);
                }
            }

            $entityTypeList = array_keys(get_object_vars($data->entityDefs));

            foreach ($entityTypeList as $entityType) {
                $linksDefs = $this->metadata->get(['entityDefs', $entityType, 'links'], []);

                $forbiddenFieldList = $this->acl->getScopeForbiddenFieldList($entityType);

                foreach ($linksDefs as $link => $defs) {
                    $type = $defs['type'] ?? null;

                    $hasField = (bool) $this->metadata->get(['entityDefs', $entityType, 'fields', $link]);

                    if ($type === 'belongsToParent') {
                        if ($hasField) {
                            $parentEntityList = $this->metadata
                                ->get(['entityDefs', $entityType, 'fields', $link, 'entityList']);

                            if (is_array($parentEntityList)) {
                                foreach ($parentEntityList as $i => $e) {
                                    if (!$this->acl->check($e)) {
                                        unset($parentEntityList[$i]);
                                    }
                                }

                                $parentEntityList = array_values($parentEntityList);

                                $data->entityDefs->$entityType->fields->$link->entityList = $parentEntityList;
                            }
                        }

                        continue;
                    }

                    $foreignEntityType = $defs['entity'] ?? null;

                    if ($foreignEntityType) {
                        if ($this->acl->check($foreignEntityType)) {
                            continue;
                        }

                        if ($this->user->isPortal()) {
                            if ($foreignEntityType === 'Account' || $foreignEntityType === 'Contact') {
                                continue;
                            }
                        }
                    }

                    if ($hasField) {
                        if (!in_array($link, $forbiddenFieldList)) {
                            continue;
                        }

                        unset($data->entityDefs->$entityType->fields->$link);
                    }

                    unset($data->entityDefs->$entityType->links->$link);

                    if (
                        isset($data->clientDefs)
                        &&
                        isset($data->clientDefs->$entityType)
                        &&
                        isset($data->clientDefs->$entityType->relationshipPanels)
                    ) {
                        unset($data->clientDefs->$entityType->relationshipPanels->$link);
                    }
                }
            }

            unset($data->entityDefs->Settings);

            $dashletList = array_keys($this->metadata->get(['dashlets'], []));

            foreach ($dashletList as $item) {
                $aclScope = $this->metadata->get(['dashlets', $item, 'aclScope']);

                if ($aclScope && !$this->acl->check($aclScope)) {
                    unset($data->dashlets->$item);
                }
            }

            unset($data->authenticationMethods);
            unset($data->formula);

            foreach (($this->metadata->get(['app', 'metadata', 'aclDependencies']) ?? []) as $target => $item) {
                $targetArr = explode('.', $target);

                if (is_string($item)) {
                    $depArr = explode('.', $item);
                    $pointer = $data;

                    foreach ($depArr as $k) {
                        if (!isset($pointer->$k)) {
                            continue 2;
                        }

                        $pointer = $pointer->$k;
                    }
                }
                else if (is_array($item)) {
                    $aclScope = $item['scope'] ?? null;
                    $aclField = $item['field'] ?? null;

                    if (!$aclScope) {
                        continue;
                    }

                    if (!$this->acl->check($aclScope)) {
                        continue;
                    }

                    if ($aclField && in_array($aclField, $this->acl->getScopeForbiddenFieldList($aclScope))) {
                        continue;
                    }
                }

                $pointer = $data;

                foreach ($targetArr as $i => $k) {
                    if ($i === count($targetArr) - 1) {
                        $pointer->$k = $this->metadata->get($targetArr);

                        break;
                    }

                    if (!isset($pointer->$k)) {
                        $pointer->$k = (object) [];
                    }

                    $pointer = $pointer->$k;
                }
            }
        }

        return $data;
    }
}