<?php

namespace RomhackPlaza\Master\Authentication;

use XF\Authentication\AbstractAuth;

class WordPress extends AbstractAuth
{

    private const ITOA64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';

    public function generate($password)
    {
        return false;
    }

    public function authenticate($userId, $password)
    {
        if (!is_string($password) || $password === '' || empty($this->data) ) {
            return false;
        }

        return $this->verifyPassword($password, $this->data['hash']);

    }

    private function verifyPassword($password, $storedHash): bool
    {
        if( str_starts_with($storedHash, '$wp') ){
            $passwordToVerify = base64_encode( hash_hmac( 'sha384', $password, 'wp-sha384', true ) );
            return password_verify( $passwordToVerify, substr($storedHash, 3) );
        }

        if (str_starts_with($storedHash, '$2y$') || str_starts_with($storedHash, '$2a$') || str_starts_with($storedHash, '$2b$')) {
            return password_verify($password, $storedHash);
        }

        if (strlen($storedHash) === 34 && (str_starts_with($storedHash, '$P$') || str_starts_with($storedHash, '$H$'))) {
            return $this->verifyPhpass($password, $storedHash);
        }

        if (strlen($storedHash) <= 32) {
            return hash_equals($storedHash, md5($password));
        }

        return false;
    }

    private function verifyPhpass(string $password, string $storedHash): bool
    {
        $itoa64 = self::ITOA64;
        $countLog2 = strpos($itoa64, $storedHash[3]);
        if ($countLog2 < 7 || $countLog2 > 30) return false;

        $count = 1 << $countLog2;
        $salt = substr($storedHash, 4, 8);
        if (strlen($salt) !== 8) return false;

        $hash = md5($salt . $password, true);
        do {
            $hash = md5($hash . $password, true);
        } while (--$count);

        $output = substr($storedHash, 0, 12) . self::encode64($hash, $itoa64);
        return hash_equals($storedHash, $output);
    }

    private function encode64(string $input, string $itoa64): string
    {
        $output = '';
        $i = 0;
        $count = strlen($input);
        do {
            $value = ord($input[$i++]);
            $output .= $itoa64[$value & 0x3f];
            if ($i < $count) $value |= ord($input[$i]) << 8;
            $output .= $itoa64[($value >> 6) & 0x3f];
            if ($i++ >= $count) break;
            if ($i < $count) $value |= ord($input[$i]) << 16;
            $output .= $itoa64[($value >> 12) & 0x3f];
            if ($i++ >= $count) break;
            $output .= $itoa64[($value >> 18) & 0x3f];
        } while ($i < $count);
        return $output;
    }

    public function getAuthenticationName()
    {
        return 'RomhackPlaza\Master:WordPress';
    }
}