<?php
/**
 * PHP Server Monitor
 * Monitor your servers and websites.
 *
 * This file is part of PHP Server Monitor.
 * PHP Server Monitor 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.
 *
 * PHP Server Monitor 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 PHP Server Monitor.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @package     phpservermon
 * @author      Pepijn Over <pep@mailbox.org>
 * @copyright   Copyright (c) 2008-2017 Pepijn Over <pep@mailbox.org>
 * @license     http://www.gnu.org/licenses/gpl.txt GNU GPL v3
 * @version     Release: v3.2.0
 * @link        http://www.phpservermonitor.org/
 * @since       phpservermon 3.0.0
 **/

namespace psm\Util\User;

/**
 * The UserValidator helps you to check input data for user accounts.
 */
class UserValidator {

	/**
	 * Available editable user levels
	 * @var array $user_levels
	 */
	protected $user_levels = array(PSM_USER_ADMIN, PSM_USER_USER);

	/**
	 * User service
	 * @var \psm\Service\User $user
	 */
	protected $user;

	public function __construct(\psm\Service\User $user) {
		$this->user = $user;
	}

	/**
	 * Check if the user id exists
	 * @param int $user_id
	 * @return boolean
	 * @throws \InvalidArgumentException
	 */
	public function userId($user_id) {
		$user = $this->user->getUser($user_id);
		if(empty($user)) {
			throw new \InvalidArgumentException('user_no_match');
		}
		return true;
	}

	/**
	 * Check username on:
	 *
	 * - Length (2-64 chars)
	 * - Contents (alphabetic chars and digits only)
	 * - Unique
	 * @param string $username
	 * @param int $user_id to check whether the username is unique
	 * @return boolean
	 * @throws \InvalidArgumentException
	 */
	public function username($username, $user_id = 0) {
		if(strlen($username) > 64 || strlen($username) < 2) {
            throw new \InvalidArgumentException('user_name_bad_length');
        }
		if (!preg_match('/^[a-zA-Z\d_]{2,64}$/i', $username)) {
            throw new \InvalidArgumentException('user_name_invalid');
		}
		$user_exists = $this->user->getUserByUsername($username);

		if(!empty($user_exists) && ($user_id == 0 || $user_id != $user_exists->user_id)) {
			throw new \InvalidArgumentException('user_name_exists');
		}
		return true;
	}

	/**
	 * Check user password
	 * @param string $password
	 * @param string $password_repeat
	 * @return boolean
	 * @throws \InvalidArgumentException
	 */
	public function password($password, $password_repeat) {
		if(empty($password) || empty($password_repeat)) {
			throw new \InvalidArgumentException('user_password_invalid');
		}
		if($password !== $password_repeat) {
			throw new \InvalidArgumentException('user_password_no_match');
		}
		return true;
	}

	/**
	 * Check email
	 * @param string $email
	 * @return boolean
	 * @throws \InvalidArgumentException
	 */
	public function email($email) {
		if(strlen($email) > 255 || strlen($email) < 5) {
			throw new \InvalidArgumentException('user_email_bad_length');
		}
		if(!filter_var($email, FILTER_VALIDATE_EMAIL)) {
			throw new \InvalidArgumentException('user_email_invalid');
		}
		return true;
	}

	/**
	 * Check user level
	 * @param int $level
	 * @return boolean
	 * @throws \InvalidArgumentException
	 */
	public function level($level) {
		if(!in_array($level, $this->user_levels)) {
			throw new \InvalidArgumentException('user_level_invalid');
		}
		return true;
	}

	/**
	 * Get list of all available user levels
	 * @return array
	 */
	public function getUserLevels() {
		return $this->user_levels;
	}
}
