<?php

class Permission
{
	private static $permissions = array(
		'superadmin' => 1, // Can do everything
		'baseconfig_global' => 2, // Change configuration globally
		'baseconfig_local' => 4, // Change configuration for specifig groups/rooms
		'translation' => 8, // Can edit translations
	);

	public static function get($permission)
	{
		if (!isset(self::$permissions[$permission])) Util::traceError('Invalid permission: ' . $permission);
		return self::$permissions[$permission];
	}


	// TODO: Doc/Refactor
	public static function addGlobalTags(&$array, $locationid, $disabled, $noneAvailDisabled = null)
	{
		if (Module::get('permissionmanager') === false)
			return;
		$one = false;
		foreach ($disabled as $perm) {
			if (User::hasPermission($perm, $locationid)) {
				$one = true;
				continue;
			}
			if (strpos($perm, '.') === false) {
				$array[$perm] = ['disabled' => 'disabled', 'readonly' => 'readonly'];
				continue;
			}
			$temp =& $array;
			foreach (explode('.', $perm) as $sub) {
				if (empty($sub) || $sub === '*')
					continue;
				$temp =& $temp[$sub];
			}
			$temp = ['disabled' => 'disabled', 'readonly' => 'readonly', 'hidden' => 'hidden'];
		}
		if (!$one && !is_null($noneAvailDisabled)) {
			$array[$noneAvailDisabled] = [
				'disabled' => 'disabled',
				'readonly' => 'readonly',
			];
		}
	}

	public static function moduleHasPermissions($moduleId)
	{
		if (Module::get('permissionmanager') === false)
			return true;
		return file_exists('modules/' . $moduleId . '/permissions/permissions.json');
	}

	/**
	 * Takes a list of locations, removes any locations from it where the user doesn't have permission,
	 * and then re-adds locations resulting from the given query. The given query should return only
	 * one column per row, which is a location id.
	 * @param $passedLocations
	 * @param $permission
	 * @param $query
	 * @param $params
	 * @return array
	 */
	public static function mergeWithDisallowed($passedLocations, $permission, $query, $params)
	{
		$allowed = User::getAllowedLocations($permission);
		if (in_array(0, $allowed))
			return $passedLocations;
		$passedLocations = array_intersect($passedLocations, $allowed);
		$oldSet = Database::queryColumnArray($query, $params);
		$oldSet = array_diff($oldSet, $allowed);
		if (!empty($oldSet)) {
			$passedLocations = array_unique(array_merge($passedLocations, $oldSet));
		}
		return $passedLocations;
	}

}