<?php

declare(strict_types=1);


/**
 * Circles - Bring cloud-users closer together.
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 *
 * @author Maxence Lange <maxence@artificial-owl.com>
 * @copyright 2021
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */


namespace OCA\Circles\Model\Helpers;

use daita\MySmallPhpTools\Traits\TArrayTools;
use OCA\Circles\Exceptions\MemberHelperException;
use OCA\Circles\Exceptions\MemberLevelException;
use OCA\Circles\Exceptions\ParseMemberLevelException;
use OCA\Circles\Model\Member;


/**
 * Class MemberHelper
 *
 * @method void mustBeMember() @throws MemberHelperException, MemberLevelException
 * @method void mustBeModerator() @throws MemberHelperException, MemberLevelException
 * @method void mustBeAdmin() @throws MemberHelperException, MemberLevelException
 * @method void mustBeOwner() @throws MemberHelperException, MemberLevelException
 * @method void cannotBeMember() @throws MemberHelperException, MemberLevelException
 * @method void cannotBeModerator() @throws MemberHelperException, MemberLevelException
 * @method void cannotBeAdmin() @throws MemberHelperException, MemberLevelException
 * @method void cannotBeOwner() @throws MemberHelperException, MemberLevelException
 *
 * @package OCA\Circles\Model\Helpers
 */
class MemberHelper {


	use TArrayTools;


	/** @var Member */
	private $member;


	/**
	 * Member constructor.
	 *
	 * @param Member $member
	 */
	public function __construct(Member $member) {
		$this->member = $member;
	}


	/**
	 * @param string $name
	 * @param array $arguments
	 *
	 * @throws MemberHelperException
	 * @throws MemberLevelException
	 */
	public function __call(string $name, array $arguments): void {
		if (substr(strtolower($name), 0, 8) === 'cannotbe') {
			$this->cannotBe(substr($name, 8), $arguments);
			return;
		}
		if (substr(strtolower($name), 0, 6) === 'mustbe') {
			$this->mustBe(substr($name, 6), $arguments);
			return;
		}

		throw new MemberHelperException('unknown method call');
	}


	/**
	 * @param string $levelString
	 * @param array $arguments
	 *
	 * @throws MemberHelperException
	 * @throws MemberLevelException
	 */
	private function mustBe(string $levelString, array $arguments): void {
		try {
			$level = Member::parseLevelString($levelString);
		} catch (ParseMemberLevelException $e) {
			throw new MemberHelperException('method ' . $levelString . ' not found');
		}

		$this->mustHaveLevelEqualOrAbove($level);
	}


	/**
	 * @param string $levelString
	 * @param array $arguments
	 *
	 * @throws MemberHelperException
	 * @throws MemberLevelException
	 */
	private function cannotBe(string $levelString, array $arguments): void {
		try {
			$level = Member::parseLevelString($levelString);
		} catch (ParseMemberLevelException $e) {
			throw new MemberHelperException('method ' . $levelString . ' not found');
		}

		if ($this->member->getLevel() >= $level) {
			throw new MemberLevelException('Member cannot be ' . $levelString);
		}
	}


	/**
	 * @param int $level
	 *
	 * @throws MemberLevelException
	 */
	public function mustHaveLevelAbove(int $level) {
		if ($this->member->getLevel() <= $level) {
			throw new MemberLevelException('Insufficient rights');
		}
	}


	/**
	 * @param int $level
	 *
	 * @throws MemberLevelException
	 */
	public function mustHaveLevelEqualOrAbove(int $level) {
		if ($this->member->getLevel() < $level) {
			throw new MemberLevelException('Insufficient rights');
		}
	}


	/**
	 * @param Member $compare
	 *
	 * @throws MemberLevelException
	 */
	public function mustBeHigherLevelThan(Member $compare) {
		$this->mustHaveLevelAbove($compare->getLevel());
	}

}

