<?php
/**
 *
 */

namespace DavidBadura\Taskwarrior;

/**
 * @author David Badura <d.a.badura@gmail.com>
 */
class Recurring
{
    const DAILY = 'daily';
    const WEEKDAYS = 'weekdays';
    const WEEKLY = 'weekly';
    const BIWEEKLY = 'biweekly';
    const QUARTERLY = 'quarterly';
    const SEMIANNUAL = 'semiannual';
    const ANNUAL = 'annual';
    const YEARLY = 'yearly';
    const BIANNUAL = 'biannual';
    const BIYEARLY = 'biyearly';

    /**
     * @var string
     */
    private $recurring;

    /**
     * @param string $recurring
     * @throws TaskwarriorException
     */
    public function __construct($recurring)
    {
        if ($this->isValid($recurring)) {
            $this->recurring = $recurring;
        } else {
            throw new TaskwarriorException();
        }
    }

    /**
     * @return string
     */
    public function __toString()
    {
        return $this->recurring;
    }

    /**
     * @param string $recur
     * @return bool
     */
    private function isValid($recur)
    {
        $refClass = new \ReflectionClass(__CLASS__);
        $constants = $refClass->getConstants();

        if (in_array($recur, $constants)) {
            return true;
        }

        if (preg_match('/^[0-9]+d$/', $recur)) {
            return true;
        }

        if (preg_match('/^[0-9]+w$/', $recur)) {
            return true;
        }

        if (preg_match('/^[0-9]+q$/', $recur)) {
            return true;
        }

        if (preg_match('/^[0-9]+y$/', $recur)) {
            return true;
        }

        return false;
    }
}