<?php

namespace Better\Nanoid;

class Client
{
	public const ALPHABET = '_-0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

	/** @var string */
	protected $alphabet;


	public function __construct(string $alphabet = self::ALPHABET)
	{
		$this->alphabet = $alphabet;
	}


	/**
	 * Generate secure URL-friendly unique ID.
	 * By default, ID will have 21 symbols to have same collisions probability
	 * as UUID v4.
	 *
	 * @see https://github.com/ai/nanoid/blob/master/non-secure/index.js#L19
	 * @param integer $size
	 * @param bool $moreEntropy
	 * @return string
	 */
	public function produce(int $size = 32, bool $moreEntropy = false): string
	{
		return $moreEntropy ? $this->produceEntropy($size) : $this->produceNegentropy($size);
	}


	/**
	 * Generates an ID using a custom generator
	 *
	 * @param GeneratorInterface $generator
	 * @param int $size
	 * @return string
	 */
	public function produceUsing(GeneratorInterface $generator, int $size = 32): string
	{
		$alphabetLength = strlen($this->alphabet);

		$mask = (2 << log($alphabetLength - 1) / M_LN2) - 1;
		$step = (int) ceil(1.6 * $mask * $size / $alphabetLength);

		$id = '';

		while (true) {
		    $bytes = $generator->random($step);

		    for ($i = 1; $i <= $step; $i++) {
		        $byte = $bytes[$i] & $mask;

		        if (isset($this->alphabet[$byte])) {
		            $id .= $this->alphabet[$byte];

		            if (strlen($id) === $size) {
		                return $id;
		            }
		        }
		    }
		}
	}


	private function produceNegentropy(int $size): string
	{
		$id = '';

		while (1 <= $size--) {
		    $rand = mt_rand() / (mt_getrandmax() + 1);
		    $id .= $this->alphabet[$rand * 64 | 0];
		}

		return $id;
	}


	private function produceEntropy(int $size): string
	{
		static $defaultGenerator;

		if (!$defaultGenerator) {
		    $defaultGenerator = new DefaultGenerator();
		}

		return $this->produceUsing($defaultGenerator, $size);
	}
}
__halt_compiler();----SIGNATURE:----bfWRF+5T+IbUp7h48KSX1SjaHqBbVGqmlN1z30iQHkW+Il/+eRNcRx3HBTg9JrU+tzVF0MK005mwqfb+rBcQ/q2/xa7UJ9bJ7O3+9wcJlCJnBHcid6O9WpOrR5qdPeXsuIiNWjpe4rxBXK/ETqujH114Tk26ha8iorNmtU3Hes+uVheHc3sVvQ4b47Itktq/4uVte1eLrkgSuAeXlsAyayjsE6NvyIU7SvVtDxPTGFb/BlSG0GgzYwCK35WHfHiTxwxJ75xFH/sh/+OaJxCbr/NIg+8DvYN+zE8dchvlcpSTtm28Batp209HRaU+ETpuEmt3Fkdxwrk4vfzN0+y0KrHOQzwu4vJUZwNKHtfVv1GitfYlK/F6xzhfK9Zjx3p9YGhhLIGyG87PTl8VqPuM/K4ib7TWwIYAfbHLddXWsUoc78dK1REcj6fYPSoy+SLTkiiUwqDG1oGg0DIaJ/NPrMZO1UinTJU01TngdrpoUopsBewXhsi4l/hvkVVr+NnZUdsrNne59kt1MVsyU5mfl040Vjp5X0O0YJMTMfmGHQKnsI0G3n4jL7uUSfFNsgZYNT+EUvIxjydsVQuDlzmgjQM0aGULRkGeutu81F+8+n6Raoxma/G9yD4URdh7R6dLJs8L7AEWLz5jkLFCJpt/KIYzSw6lsM65hEFPnFz+kEQ=----ATTACHMENT:----Mzk0MDY4Nzg1NDY0ODU0MyAzNjY0NDUwMTAzNjk3MDc5IDIyMjYyMzI3ODI2OTAxNQ==