<?php
namespace wcf\system\category;
use wcf\data\category\Category;
use wcf\data\user\User;
use wcf\system\cache\builder\CategoryACLOptionCacheBuilder;
use wcf\system\SingletonFactory;
use wcf\system\WCF;

/**
 * Handles the category permissions.
 * 
 * @author	Matthias Schmidt
 * @copyright	2001-2018 WoltLab GmbH
 * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
 * @package	WoltLabSuite\Core\System\Category
 */
class CategoryPermissionHandler extends SingletonFactory {
	/**
	 * cached category acl options
	 * @var	array
	 */
	protected $categoryPermissions = [];
	
	/**
	 * Returns the acl options for the given category and for the given user.
	 * If no user is given, the active user is used.
	 * 
	 * @param	Category	$category
	 * @param	User		$user
	 * @return	integer[]
	 */
	public function getPermissions(Category $category, User $user = null) {
		if ($user === null) {
			$user = WCF::getUser();
		}
		
		$permissions = [];
		if (isset($this->categoryPermissions[$category->categoryID])) {
			if (isset($this->categoryPermissions[$category->categoryID]['group'])) {
				foreach ($user->getGroupIDs() as $groupID) {
					if (isset($this->categoryPermissions[$category->categoryID]['group'][$groupID])) {
						foreach ($this->categoryPermissions[$category->categoryID]['group'][$groupID] as $optionName => $optionValue) {
							if (isset($permissions[$optionName])) {
								$permissions[$optionName] = $permissions[$optionName] || $optionValue;
							}
							else {
								$permissions[$optionName] = $optionValue;
							}
						}
					}
				}
			}
			
			if (isset($this->categoryPermissions[$category->categoryID]['user']) && isset($this->categoryPermissions[$category->categoryID]['user'][$user->userID])) {
				foreach ($this->categoryPermissions[$category->categoryID]['user'][$user->userID] as $optionName => $optionValue) {
					$permissions[$optionName] = $optionValue;
				}
			}
		}
		
		return $permissions;
	}
	
	/**
	 * @inheritDoc
	 */
	protected function init() {
		$this->categoryPermissions = CategoryACLOptionCacheBuilder::getInstance()->getData();
	}
	
	/**
	 * Resets the category permission cache.
	 */
	public function resetCache() {
		CategoryACLOptionCacheBuilder::getInstance()->reset();
	}
}