<?php


namespace Cijber;

use Cijber\OpenSSL\FFIWrapper;
use Cijber\OpenSSL\Instance;
use Cijber\OpenSSL\X509Store;
use FFI;

/**
 * Class OpenSSL
 * @package Cijber
 */
class OpenSSL
{
    private static ?Instance $instance = null;
    private static ?FFI $stdLib = null;

    /**
     * Get an OpenSSL instance which holds the FFI object,
     * And initializes OpenSSL and frees when destructed
     *
     * @return Instance
     */
    public static function getInstance(): Instance
    {
        if (static::$instance === null) {
            static::$instance = new Instance();
            static::$instance->init();
        }

        return static::$instance;
    }

    public static function getFFI(): FFI
    {
        return static::getInstance()->getFFI();
    }

    public static function getStdLib(): FFI
    {
        if (static::$stdLib === null) {
            static::$stdLib = FFI::cdef("void* malloc (size_t size);", "libc.so.6");
        }

        return static::$stdLib;
    }

    public static function malloc(int $size): FFI\CData
    {
        return static::getStdLib()->malloc($size);
    }

    public static function consumeErrors(): array
    {
        $ffi = static::getFFI();
        $errs = [];
        while (0 !== ($code = $ffi->ERR_get_error())) {
            $ptr = $ffi->ERR_error_string($code, null);
            $errs[] = FFI::string($ptr);
        }

        return $errs;
    }

    public static function addressOf(FFI\CData $data): int
    {
        return FFI::cast("long long", $data)->cdata;
    }

    public static $caStore = null;

    public static function CAStore()
    {
        if (static::$caStore === null) {
            static::$caStore = X509Store::default();
        }

        return static::$caStore;
    }
}