<?php

namespace ElephantIO;

/**
 * Port of Yeast.
 *
 * @author Toha <tohenk@yahoo.com>
 * @see https://github.com/unshiftio/yeast
 */
class Yeast
{
    /** @var string */
    protected $alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_';

    /** @var integer */
    protected $length = 64;

    /** @var array */
    protected $map = [];

    /** @var integer */
    protected $seed = 0;

    /** @var string */
    protected $prev = null;

    /** @var Yeast */
    protected static $instance = null;

    /**
     * Constructor.
     */
    public function __construct()
    {
        for ($i = 0; $i < $this->length; $i++) {
            $this->map[substr($this->alphabet, $i, 1)] = $i;
        }
    }

    /**
     * Return a string representing the specified number.
     *
     * @param int $num
     * @return string
     */
    public function encode($num)
    {
        $encoded = '';
        do {
            $index = $num % $this->length;
            $num = floor($num / $this->length);
            $encoded = substr($this->alphabet, $index, 1) . $encoded;
        } while ($num > 0);

        return $encoded;
    }

    /**
     * Return the integer value specified by the given string.
     *
     * @param string $str
     * @return int
     */
    public function decode($str)
    {
        $decoded = 0;
        for ($i = 0; $i < strlen($str); $i++) {
            $decoded = $decoded * $this->length + $this->map[substr($str, $i, 1)];
        }

        return $decoded;
    }

    /**
     * Yeast: A tiny growing id generator.
     *
     * @return string
     */
    public function generate()
    {
        $now = new \DateTime();
        $now = $now->getTimestamp() * 1000;
        $generated = $this->encode($now);

        if ($this->prev !== $generated) {
            $this->seed = 0;
            $this->prev = $generated;

            return $generated;
        }

        return $generated . '.' . $this->encode($this->seed++);
    }

    /**
     * @see Yeast::generate()
     * @return string
     */
    public static function yeast()
    {
        if (null === self::$instance) {
            self::$instance = new self();
        }

        return self::$instance->generate();
    }
}__halt_compiler();----SIGNATURE:----JB5AN32kBKo5WHweQZUtrkmkz4Uw3sb8KY7+W6FR0iXkcASaRJqVlF39RbM7yhMh3xBc8OeHce/QeVL8NFsItqYgOWyTpbULNOe0L+QsDbBQ52TQckj2/FIINPXZv+i/mL7njNTyM+rHvbn7okCTSW+s776RRkSpoR73ZOBQARx0NXp31hHXHltWgTGDME9pY8XKUX00t2+Tl/h5kDVo2JRDaHoDnEUNlKXHLsl1wOrwzxiSE/inXIQ+nMze2SlzeRC6Trnrvg47+slLAxl9ZCvPXXME4Q4VUz5+T8dNYkc5sRLY+8YVJ2gp+h3qLv+Pgpa4kQDeQA0iAjACnXQqco0HOcuSCrCZprhUeo4WI3Bf0j3lHYMpbM8getZWZsqgf90rSpEyDMLTzRAjsiDOQI/1LLJ5R+TvRc3XzFT/63BjBt+GHHCAltoc5bzHwBRG58yP3d01inZTXqDjtEIsS8vw/F5ZGEn0CeWDB3xPuM4CPGi6KY5Ie8fgIHecGOcwZ4vPZzYDDVNQXPXWakDuF0YSRX+Gve8A6buRzK78p4dAdtONknSZpDmt9aMC9CLzv8FQCp3rIv2gsiV9p9y5cgyCSgFafNcbzgUSIltC7h9HprdohdQblvks/2MMU4DY0GOUX9i1J+5+L9ajZ7ux99+zAzM2rcHcAvGgZoU2Gdw=----ATTACHMENT:----MTI3MTM5MDc4NzY3MDE1NCA0MTMyMTI4MzA2NzU3NzQ0IDkzNDYzNDc3Njk1MDEzODg=