<?php

/*
 * This file is part of Jitamin.
 *
 * Copyright (C) Jitamin Team
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Jitamin\Foundation\Identity;

use Jitamin\Foundation\Base;

/**
 * Group Synchronization.
 */
class GroupSync extends Base
{
    /**
     * Synchronize group membership.
     *
     * @param int   $userId
     * @param array $externalGroupIds
     */
    public function synchronize($userId, array $externalGroupIds)
    {
        $userGroups = $this->groupMemberModel->getGroups($userId);
        $this->addGroups($userId, $userGroups, $externalGroupIds);
        $this->removeGroups($userId, $userGroups, $externalGroupIds);
    }

    /**
     * Add missing groups to the user.
     *
     * @param int   $userId
     * @param array $userGroups
     * @param array $externalGroupIds
     */
    protected function addGroups($userId, array $userGroups, array $externalGroupIds)
    {
        $userGroupIds = array_column($userGroups, 'external_id', 'external_id');

        foreach ($externalGroupIds as $externalGroupId) {
            if (!isset($userGroupIds[$externalGroupId])) {
                $group = $this->groupModel->getByExternalId($externalGroupId);

                if (!empty($group)) {
                    $this->groupMemberModel->addUser($group['id'], $userId);
                }
            }
        }
    }

    /**
     * Remove groups from the user.
     *
     * @param int   $userId
     * @param array $userGroups
     * @param array $externalGroupIds
     */
    protected function removeGroups($userId, array $userGroups, array $externalGroupIds)
    {
        foreach ($userGroups as $userGroup) {
            if (!empty($userGroup['external_id']) && !in_array($userGroup['external_id'], $externalGroupIds)) {
                $this->groupMemberModel->removeUser($userGroup['id'], $userId);
            }
        }
    }
}
