<?php
declare(strict_types=1);

namespace api\components\OAuth2\Entities;

use api\components\OAuth2\Repositories\PublicScopeRepository;
use api\components\Tokens\TokensFactory;
use DateTimeImmutable;
use League\OAuth2\Server\CryptKeyInterface;
use League\OAuth2\Server\Entities\AccessTokenEntityInterface;
use League\OAuth2\Server\Entities\ScopeEntityInterface;
use League\OAuth2\Server\Entities\Traits\EntityTrait;
use League\OAuth2\Server\Entities\Traits\TokenEntityTrait;

class AccessTokenEntity implements AccessTokenEntityInterface {
    use EntityTrait;
    use TokenEntityTrait {
        getExpiryDateTime as parentGetExpiryDateTime;
    }

    /**
     * There is no need to store offline_access scope in the resulting access_token.
     * We cannot remove it from the token because otherwise we won't be able to form a refresh_token.
     * That's why we delete offline_access before creating the token and then return it back.
     *
     * @return string
     */
    public function __toString(): string {
        $scopes = $this->scopes;
        $this->scopes = array_filter($this->scopes, function(ScopeEntityInterface $scope): bool {
            return $scope->getIdentifier() !== PublicScopeRepository::OFFLINE_ACCESS;
        });

        $token = TokensFactory::createForOAuthClient($this);

        $this->scopes = $scopes;

        return (string)$token;
    }

    public function setPrivateKey(CryptKeyInterface $privateKey): void {
        // We use a general-purpose component to build JWT tokens, so there is no need to keep the key
    }

    public function getExpiryDateTime(): DateTimeImmutable {
        // TODO: extend token life depending on scopes list
        return $this->parentGetExpiryDateTime();
    }

}