<?php

declare(strict_types=1);

namespace D3\Webauthn\Application\Model;

use D3\Totp\Modules\Application\Model\d3_totp_user;
use D3\Webauthn\Application\Model\Credential\PublicKeyCredential;
use D3\Webauthn\Application\Model\Credential\PublicKeyCredentialList;
use Nyholm\Psr7\Factory\Psr17Factory;
use Nyholm\Psr7Server\ServerRequestCreator;
use OxidEsales\Eshop\Application\Model\User;
use OxidEsales\Eshop\Core\Registry;
use Webauthn\PublicKeyCredentialCreationOptions;
use Webauthn\PublicKeyCredentialRequestOptions;
use Webauthn\PublicKeyCredentialRpEntity;
use Webauthn\PublicKeyCredentialSource;
use Webauthn\Server;

class Webauthn
{
    public const SESSION_CREATIONS_OPTIONS = 'd3WebAuthnCreationOptions';
    public const SESSION_ASSERTION_OPTIONS = 'd3WebAuthnAssertionOptions';

    /**
     * @return false|string
     */
    public function getCreationOptions(User $user)
    {
        /** @var d3_totp_user $user */
        $userEntity = $user->d3GetWebauthnUserEntity();

        /** @var PublicKeyCredentialList $credentialSourceRepository */
        $credentialSourceRepository = oxNew(PublicKeyCredentialList::class);
        $credentialSources = $credentialSourceRepository->findAllForUserEntity($userEntity);
        $excludeCredentials = array_map(function (PublicKeyCredentialSource $credential) {
            return $credential->getPublicKeyCredentialDescriptor();
        }, $credentialSources);

        $server = $this->getServer();
        $publicKeyCredentialCreationOptions = $server->generatePublicKeyCredentialCreationOptions(
            $userEntity,
            PublicKeyCredentialCreationOptions::ATTESTATION_CONVEYANCE_PREFERENCE_NONE,
            $excludeCredentials
        );

        Registry::getSession()->setVariable(self::SESSION_CREATIONS_OPTIONS, $publicKeyCredentialCreationOptions);

        return json_encode($publicKeyCredentialCreationOptions,JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
    }

    public function getRequestOptions()
    {
        /** @var d3_totp_user $user */
        $user = oxNew(User::class);
        $user->load('oxdefaultadmin');
        $userEntity = $user->d3GetWebauthnUserEntity();

        // Get the list of authenticators associated to the user
        $credentialSourceRepository = oxNew(PublicKeyCredentials::class);
        $credentialSources = $credentialSourceRepository->findAllForUserEntity($userEntity);

        // Convert the Credential Sources into Public Key Credential Descriptors
        $allowedCredentials = array_map(function (PublicKeyCredentialSource $credential) {
            return $credential->getPublicKeyCredentialDescriptor();
        }, $credentialSources);

        $server = $this->getServer();

        // We generate the set of options.
        $publicKeyCredentialRequestOptions = $server->generatePublicKeyCredentialRequestOptions(
            PublicKeyCredentialRequestOptions::USER_VERIFICATION_REQUIREMENT_PREFERRED, // Default value
            $allowedCredentials
        );

        Registry::getSession()->setVariable(self::SESSION_ASSERTION_OPTIONS, $publicKeyCredentialRequestOptions);

        return json_encode($publicKeyCredentialRequestOptions, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
    }

    /**
     * @return Server
     */
    public function getServer()
    {
        $rpEntity = new PublicKeyCredentialRpEntity(
            Registry::getConfig()->getActiveShop()->getFieldData('oxname'),
            preg_replace('/(^www\.)(.*)/mi', '$2', $_SERVER['HTTP_HOST'])
        );

        return new Server($rpEntity, oxNew(PublicKeyCredentialList::class));
    }

    public function saveAuthn(string $credential, string $keyName = null)
    {
        try {
            $psr17Factory = new Psr17Factory();
            $creator = new ServerRequestCreator(
                $psr17Factory,
                $psr17Factory,
                $psr17Factory,
                $psr17Factory
            );
            $serverRequest = $creator->fromGlobals();

            $publicKeyCredentialSource = $this->getServer()->loadAndCheckAttestationResponse(
                html_entity_decode($credential),
                Registry::getSession()->getVariable(self::SESSION_CREATIONS_OPTIONS),
                $serverRequest
            );

            $pkCredential = oxNew(PublicKeyCredential::class);
            $pkCredential->saveCredentialSource($publicKeyCredentialSource, $keyName);
        } catch (\Exception $e) {
            dumpvar($e->getMessage());
            dumpvar($e);

            die();
        }
    }

    public function assertAuthn(string $response)
    {
        try {
            $psr17Factory = new Psr17Factory();
            $creator = new ServerRequestCreator(
                $psr17Factory,
                $psr17Factory,
                $psr17Factory,
                $psr17Factory
            );
            $serverRequest = $creator->fromGlobals();

            /** @var d3_totp_user $user */
            $user = oxNew(User::class);
            $user->load('oxdefaultadmin');
            $userEntity = $user->d3GetWebauthnUserEntity();

            $publicKeySource = $this->getServer()->loadAndCheckAssertionResponse(
                html_entity_decode($response),
                Registry::getSession()->getVariable(self::SESSION_ASSERTION_OPTIONS),
                $userEntity,
                $serverRequest
            );
/*
            dumpvar($publicKeySource);
            dumpvar(serialize($publicKeySource));
            dumpvar(unserialize(serialize($publicKeySource)));
            echo "<hr>";
            dumpvar(bin2hex(serialize($publicKeySource)));
            dumpvar(unserialize(hex2bin(bin2hex(serialize($publicKeySource)))));
*/

            dumpvar('successfully');

        } catch (\Exception $e) {
            dumpvar($e->getMessage());
            dumpvar($e);

            die();
        }
    }
}