<?php

namespace Rize\UriTemplate\Operator;

use Rize\UriTemplate\Node;
use Rize\UriTemplate\Parser;

/**
 * | 1   |    {/list}    /red,green,blue                  | {$value}*(?:,{$value}+)*
 * | 2   |    {/list*}   /red/green/blue                  | {$value}+(?:{$sep}{$value}+)*
 * | 3   |    {/keys}    /semi,%3B,dot,.,comma,%2C        | /(\w+,?)+
 * | 4   |    {/keys*}   /semi=%3B/dot=./comma=%2C        | /(?:\w+=\w+/?)*.
 */
class UnNamed extends Abstraction
{
    public function toRegex(Parser $parser, Node\Variable $var): string
    {
        $value   = $this->getRegex();
        $options = $var->options;

        if ($options['modifier']) {
            switch ($options['modifier']) {
                case '*':
                    // 2 | 4
                    $regex = "{$value}+(?:{$this->sep}{$value}+)*";

                    break;

                case ':':
                    $regex = $value . '{0,' . $options['value'] . '}';

                    break;

                case '%':
                    throw new \InvalidArgumentException('% (array) modifier only works with Named type operators e.g. ;,?,&');

                default:
                    throw new \InvalidArgumentException("Unknown modifier `{$options['modifier']}`");
            }
        } else {
            // 1, 3
            $regex = "{$value}*(?:,{$value}+)*";
        }

        return $regex;
    }
}