<?php
/**
 * Authserver, an OAuth2-based single-signon authentication provider written in PHP.
 *
 * Copyright (C) $today.date  Lars Vierbergen
 *
 * his program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace vierbergenlars\AuthserverExternalAccountBundle\ExternalAccount;


use vierbergenlars\AuthserverExternalAccountBundle\Entity\ExternalUser;

class ExternalAccountProviderManager
{
    /**
     * @var ExternalAccountProviderInterface[]
     */
    private $externalAccountProviders = [];

    public function addAccountProvider(ExternalAccountProviderInterface $accountProvider)
    {
        if(isset($this->externalAccountProviders[$accountProvider->getName()]))
            throw new \InvalidArgumentException(sprintf('Provider "%s" is already registered.', $accountProvider->getName()));
        $this->externalAccountProviders[$accountProvider->getName()] = $accountProvider;
    }

    /**
     *
     * @return ExternalAccountProviderInterface[]
     */
    public function getAccountProviders()
    {
        return array_values($this->externalAccountProviders);
    }

    /**
     * @param ExternalUser $externalUser
     * @return ExternalAccountProviderInterface
     */
    public function getProviderForExternalUser(ExternalUser $externalUser)
    {
        $provider = $externalUser->getProvider();
        return $this->getProviderByName($provider);
    }

    /**
     * @param ExternalUser $externalUser
     * @return ExternalAccountProviderInterface|null
     */
    public function getProviderForExternalUserUnsafe(ExternalUser $externalUser)
    {
        $provider = $externalUser->getProvider();
        return $this->getProviderByNameUnsafe($provider);
    }

    /**
     * @param string $providerName
     * @return ExternalAccountProviderInterface
     */
    public function getProviderByName($providerName)
    {
        if(!isset($this->externalAccountProviders[$providerName]))
            throw new \OutOfBoundsException(sprintf('Provider "%s" is not configured.', $providerName));

        return $this->externalAccountProviders[$providerName];
    }

    /**
     * @param string $providerName
     * @return ExternalAccountProviderInterface|null
     */
    public function getProviderByNameUnsafe($providerName)
    {
        try {
            return $this->getProviderByName($providerName);
        } catch(\OutOfBoundsException $ex) {
            return new NullExternalAccountProvider($providerName);
        }
    }

    public function getProviderSupporting($externalProviderData)
    {
        foreach($this->externalAccountProviders as $provider) {
            if($provider->supports($externalProviderData))
                return $provider;
        }
        throw new \OutOfBoundsException(sprintf('Can not find any provider handling data of type %s', is_object($externalProviderData)?get_class($externalProviderData):gettype($externalProviderData)));
    }
}