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<?php
/*
 * Spring Signage Ltd - http://www.springsignage.com
 * Copyright (C) 2015 Spring Signage Ltd
 * (UserGroup.php)
 */

namespace Xibo\Entity;

use Respect\Validation\Validator as v;
use Xibo\Exception\DuplicateEntityException;
use Xibo\Exception\InvalidArgumentException;
use Xibo\Exception\NotFoundException;
use Xibo\Factory\UserFactory;
use Xibo\Factory\UserGroupFactory;
use Xibo\Service\LogServiceInterface;
use Xibo\Storage\StorageServiceInterface;

/**
 * Class UserGroup
 * @package Xibo\Entity
 *
 * @SWG\Definition()
 */
class UserGroup
{
    use EntityTrait;

/**
     * @SWG\Property(description="The Group ID")
     * @var int
     */
    public $groupId;

/**
     * @SWG\Property(description="The group name")
     * @var string
     */
    public $group;

/**
     * @SWG\Property(description="A flag indicating whether this is a user specific group or not")
     * @var int
     */
    public $isUserSpecific = 0;

/**
     * @SWG\Property(description="A flag indicating the special everyone group")
     * @var int
     */
    public $isEveryone = 0;

/**
     * @SWG\Property(description="This users library quota in bytes. 0 = unlimited")
     * @var int
     */
    public $libraryQuota;

/**
     * @SWG\Property(description="Does this Group receive system notifications.")
     * @var int
     */
    public $isSystemNotification = 0;

/**
     * @SWG\Property(description="Does this Group receive display notifications.")
     * @var int
     */
    public $isDisplayNotification = 0;

// Users
    private $users = [];

/**
     * @var UserGroupFactory
     */
    private $userGroupFactory;

/**
     * @var UserFactory
     */
    private $userFactory;

/**
     * Entity constructor.
     * @param StorageServiceInterface $store
     * @param LogServiceInterface $log
     * @param UserGroupFactory $userGroupFactory
     * @param UserFactory $userFactory
     */
    public function __construct($store, $log, $userGroupFactory, $userFactory)
    {
        $this->setCommonDependencies($store, $log);

$this->userGroupFactory = $userGroupFactory;
        $this->userFactory = $userFactory;
    }

/**
     *
     */
    public function __clone()
    {
        // Clear the groupId
        $this->groupId = null;
    }

/**
     * @return string
     */
    public function __toString()
    {
        return sprintf('ID = %d, Group = %s, IsUserSpecific = %d', $this->groupId, $this->group, $this->isUserSpecific);
    }

/**
     * Generate a unique hash for this User Group
     */
    private function hash()
    {
        return md5(json_encode($this));
    }

/**
     * @return int
     */
    public function getId()
    {
        return $this->groupId;
    }

/**
     * @return int
     */
    public function getOwnerId()
    {
        return 0;
    }

/**
     * Set the Owner of this Group
     * @param User $user
     */
    public function setOwner($user)
    {
        $this->load();

$this->isUserSpecific = 1;
        $this->isEveryone = 0;
        $this->assignUser($user);
    }

/**
     * Assign User
     * @param User $user
     */
    public function assignUser($user)
    {
        $this->load();

if (!in_array($user, $this->users))
            $this->users[] = $user;
    }

/**
     * Unassign User
     * @param User $user
     */
    public function unassignUser($user)
    {
        $this->load();

$this->users = array_udiff($this->users, [$user], function($a, $b) {
            /**
             * @var User $a
             * @var User $b
             */
            return $a->getId() - $b->getId();
        });
    }

/**
     * Validate
     */
    public function validate()
    {
        if (!v::stringType()->length(1, 50)->validate($this->group))
            throw new InvalidArgumentException(__('User Group Name cannot be empty.') . $this, 'name');

if ($this->libraryQuota !== null && !v::intType()->validate($this->libraryQuota))
            throw new InvalidArgumentException(__('Library Quota must be a whole number.'), 'libraryQuota');

try {
            $group = $this->userGroupFactory->getByName($this->group, $this->isUserSpecific);

if ($this->groupId == null || $this->groupId != $group->groupId)
                throw new DuplicateEntityException(__('There is already a group with this name. Please choose another.'));
        }
        catch (NotFoundException $e) {

}
    }

/**
     * Load this User Group
     * @param array $options
     */
    public function load($options = [])
    {
        $options = array_merge([
            'loadUsers' => true
        ], $options);

if ($this->loaded || $this->groupId == 0)
            return;

if ($options['loadUsers']) {
            if ($this->userFactory == null)
                throw new \RuntimeException('Cannot load without first calling setChildObjectDependencies');

// Load all assigned users
            $this->users = $this->userFactory->getByGroupId($this->groupId);
        }

// Set the hash
        $this->hash = $this->hash();
        $this->loaded = true;
    }

/**
     * Save the group
     * @param array $options
     */
    public function save($options = [])
    {
        $options = array_merge([
            'validate' => true,
            'linkUsers' => true
        ], $options);

if ($options['validate'])
            $this->validate();

if ($this->groupId == null || $this->groupId == 0)
            $this->add();
        else if ($this->hash() != $this->hash)
            $this->edit();

if ($options['linkUsers']) {
            $this->linkUsers();
            $this->unlinkUsers();
        }
    }

/**
     * Delete this Group
     */
    public function delete()
    {
        // We must ensure everything is loaded before we delete
        if ($this->hash == null)
            $this->load();

// Unlink users
        $this->removeAssignments();

$this->getStore()->update('DELETE FROM `permission` WHERE groupId = :groupId', ['groupId' => $this->groupId]);
        $this->getStore()->update('DELETE FROM `group` WHERE groupId = :groupId', ['groupId' => $this->groupId]);
    }

/**
     * Remove all assignments
     */
    private function removeAssignments()
    {
        // Delete Notifications
        // NB: notifications aren't modelled as child objects because there could be many thousands of notifications on each
        // usergroup. We consider the notification to be the parent here and it manages the assignments.
        // This does mean that we might end up with an empty notification (not assigned to anything)
        $this->getStore()->update('DELETE FROM `lknotificationuser` WHERE `userId` IN (SELECT `userId` FROM `lkusergroup` WHERE `groupId` = :groupId) ', ['groupId' => $this->groupId]);
        $this->getStore()->update('DELETE FROM `lknotificationgroup` WHERE `groupId` = :groupId', ['groupId' => $this->groupId]);

// Remove user assignments
        $this->users = [];
        $this->unlinkUsers();
    }

/**
     * Add
     */
    private function add()
    {
        $this->groupId = $this->getStore()->insert('INSERT INTO `group` (`group`, IsUserSpecific, libraryQuota, `isSystemNotification`, `isDisplayNotification`)
              VALUES (:group, :isUserSpecific, :libraryQuota, :isSystemNotification, :isDisplayNotification)', [
            'group' => $this->group,
            'isUserSpecific' => $this->isUserSpecific,
            'libraryQuota' => $this->libraryQuota,
            'isSystemNotification' => $this->isSystemNotification,
            'isDisplayNotification' => $this->isDisplayNotification
        ]);
    }

/**
     * Edit
     */
    private function edit()
    {
        $this->getStore()->update('
          UPDATE `group` SET 
            `group` = :group, 
            libraryQuota = :libraryQuota, 
            `isSystemNotification` = :isSystemNotification,
            `isDisplayNotification` = :isDisplayNotification 
           WHERE groupId = :groupId
        ', [
            'groupId' => $this->groupId,
            'group' => $this->group,
            'libraryQuota' => $this->libraryQuota,
            'isSystemNotification' => $this->isSystemNotification,
            'isDisplayNotification' => $this->isDisplayNotification
        ]);
    }

/**
     * Link Users
     */
    private function linkUsers()
    {
        $insert = $this->getStore()->getConnection()->prepare('INSERT INTO `lkusergroup` (groupId, userId) VALUES (:groupId, :userId) ON DUPLICATE KEY UPDATE groupId = groupId');

foreach ($this->users as $user) {
            /* @var User $user */
            $this->getLog()->debug('Linking %s to %s', $user->userName, $this->group);

$insert->execute([
                'groupId' => $this->groupId,
                'userId' => $user->userId
            ]);
        }
    }

/**
     * Unlink Users
     */
    private function unlinkUsers()
    {
        $params = ['groupId' => $this->groupId];

$sql = 'DELETE FROM `lkusergroup` WHERE groupId = :groupId AND userId NOT IN (0';

$i = 0;
        foreach ($this->users as $user) {
            /* @var User $user */
            $i++;
            $sql .= ',:userId' . $i;
            $params['userId' . $i] = $user->userId;
        }

$sql .= ')';

$this->getStore()->update($sql, $params);
    }
}