<?php
  
  /**
   * This file is part of the Carbon package.
   *
   * (c) Brian Nesbitt <brian@nesbot.com>
   *
   * For the full copyright and license information, please view the LICENSE
   * file that was distributed with this source code.
   */
  
  namespace Carbon\Traits;
  
  use Carbon\CarbonInterval;
  use Carbon\Exceptions\InvalidIntervalException;
  use DateInterval;
  
  /**
   * Trait to call rounding methods to interval or the interval of a period.
   */
  trait IntervalRounding
  {
      protected function callRoundMethod(string $method, array $parameters)
      {
          $action = substr($method, 0, 4);
  
          if ($action !== 'ceil') {
              $action = substr($method, 0, 5);
          }
  
          if (\in_array($action, ['round', 'floor', 'ceil'])) {
              return $this->{$action.'Unit'}(substr($method, \strlen($action)), ...$parameters);
          }
  
          return null;
      }
  
      protected function roundWith($precision, $function)
      {
          $unit = 'second';
  
          if ($precision instanceof DateInterval) {
              $precision = (string) CarbonInterval::instance($precision, [], true);
          }
  
          if (\is_string($precision) && preg_match('/^\s*(?<precision>\d+)?\s*(?<unit>\w+)(?<other>\W.*)?$/', $precision, $match)) {
              if (trim($match['other'] ?? '') !== '') {
                  throw new InvalidIntervalException('Rounding is only possible with single unit intervals.');
              }
  
              $precision = (int) ($match['precision'] ?: 1);
              $unit = $match['unit'];
          }
  
          return $this->roundUnit($unit, $precision, $function);
      }
  }