<?php

namespace Nette\Security;

use Nette;

/**
 * Password Hashing.
 */
class Passwords
{
    use Nette\SmartObject;

    /**
     * Chooses which secure algorithm is used for hashing and how to configure it.
     * @see https://php.net/manual/en/password.constants.php
     */
    public function __construct(
        private string $algo = PASSWORD_DEFAULT,
        private array $options = [],
    ) {
    }

    /**
     * Computes password´s hash. The result contains the algorithm ID and its settings, cryptographical salt and the hash itself.
     */
    public function hash(string $password): string
    {
        if ($password === '') {
            throw new Nette\InvalidArgumentException('Password can not be empty.');
        }

        $hash = @password_hash($password, $this->algo, $this->options); // @ is escalated to exception
        if (!$hash) {
            throw new Nette\InvalidStateException('Computed hash is invalid. ' . error_get_last()['message']);
        }

        return $hash;
    }

    /**
     * Finds out, whether the given password matches the given hash.
     */
    public function verify(string $password, string $hash): bool
    {
        return password_verify($password, $hash);
    }

    /**
     * Finds out if the hash matches the options given in constructor.
     */
    public function needsRehash(string $hash): bool
    {
        return password_needs_rehash($hash, $this->algo, $this->options);
    }
}
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