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<?php
/*!
* Hybridauth
* https://hybridauth.github.io | https://github.com/hybridauth/hybridauth
*  (c) 2017 Hybridauth authors | https://hybridauth.github.io/license.html
*/

namespace Hybridauth;

use Hybridauth\Exception\InvalidArgumentException;
use Hybridauth\Exception\UnexpectedValueException;
use Hybridauth\Storage\StorageInterface;
use Hybridauth\Logger\LoggerInterface;
use Hybridauth\Logger\Logger;
use Hybridauth\HttpClient\HttpClientInterface;

/**
 * Hybridauth\Hybridauth
 *
 * For ease of use of multiple providers, Hybridauth implements the class Hybridauth\Hybridauth,
 * a sort of factory/façade which acts as an unified interface or entry point, and it expects a
 * configuration array containing the list of providers you want to use, their respective credentials
 * and authorized callback.
 */
class Hybridauth
{
    /**
     * Hybridauth config.
     *
     * @var array
     */
    protected $config;

    /**
     * Storage.
     *
     * @var StorageInterface
     */
    protected $storage;

    /**
     * HttpClient.
     *
     * @var HttpClientInterface
     */
    protected $httpClient;

    /**
     * Logger.
     *
     * @var LoggerInterface
     */
    protected $logger;

    /**
     * @param array|string $config Array with configuration or Path to PHP file that will return array
     * @param HttpClientInterface $httpClient
     * @param StorageInterface $storage
     * @param LoggerInterface $logger
     *
     * @throws InvalidArgumentException
     */
    public function __construct(
        $config,
        HttpClientInterface $httpClient = null,
        StorageInterface $storage = null,
        LoggerInterface $logger = null
    ) {
        if (is_string($config) && file_exists($config)) {
            $config = include $config;
        } elseif (!is_array($config)) {
            throw new InvalidArgumentException('Hybridauth config does not exist on the given path.');
        }

        $this->config = $config + [
                'debug_mode' => Logger::NONE,
                'debug_file' => '',
                'curl_options' => null,
                'providers' => []
            ];
        $this->storage = $storage;
        $this->logger = $logger;
        $this->httpClient = $httpClient;
    }

    /**
     * Instantiate the given provider and authentication or authorization protocol.
     *
     * If not authenticated yet, the user will be redirected to the provider's site for
     * authentication/authorisation, otherwise it will simply return an instance of
     * provider's adapter.
     *
     * @param string $name adapter's name (case insensitive)
     *
     * @return \Hybridauth\Adapter\AdapterInterface
     * @throws InvalidArgumentException
     * @throws UnexpectedValueException
     */
    public function authenticate($name)
    {
        $adapter = $this->getAdapter($name);

        $adapter->authenticate();

        return $adapter;
    }

    /**
     * Returns a new instance of a provider's adapter by name
     *
     * @param string $name adapter's name (case insensitive)
     *
     * @return \Hybridauth\Adapter\AdapterInterface
     * @throws InvalidArgumentException
     * @throws UnexpectedValueException
     */
    public function getAdapter($name)
    {
        $config = $this->getProviderConfig($name);

        $adapter = isset($config['adapter']) ? $config['adapter'] : sprintf('Hybridauth\\Provider\\%s', $name);

        if (!class_exists($adapter)) {
            $adapter = null;
            $fs = new \FilesystemIterator(__DIR__ . '/Provider/');
            /** @var \SplFileInfo $file */
            foreach ($fs as $file) {
                if (!$file->isDir()) {
                    $provider = strtok($file->getFilename(), '.');
                    if (strtolower($name) === mb_strtolower($provider)) {
                        $adapter = sprintf('Hybridauth\\Provider\\%s', $provider);
                        break;
                    }
                }
            }
            if ($adapter === null) {
                throw new InvalidArgumentException('Unknown Provider.');
            }
        }

        return new $adapter($config, $this->httpClient, $this->storage, $this->logger);
    }

    /**
     * Get provider config by name.
     *
     * @param string $name adapter's name (case insensitive)
     *
     * @throws UnexpectedValueException
     * @throws InvalidArgumentException
     *
     * @return array
     */
    public function getProviderConfig($name)
    {
        $name = strtolower($name);

        $providersConfig = array_change_key_case($this->config['providers'], CASE_LOWER);

        if (!isset($providersConfig[$name])) {
            throw new InvalidArgumentException('Unknown Provider.');
        }

        if (!$providersConfig[$name]['enabled']) {
            throw new UnexpectedValueException('Disabled Provider.');
        }

        $config = $providersConfig[$name];
        $config += [
            'debug_mode' => $this->config['debug_mode'],
            'debug_file' => $this->config['debug_file'],
        ];

        if (!isset($config['callback']) && isset($this->config['callback'])) {
            $config['callback'] = $this->config['callback'];
        }

        return $config;
    }

    /**
     * Returns a boolean of whether the user is connected with a provider
     *
     * @param string $name adapter's name (case insensitive)
     *
     * @return bool
     * @throws InvalidArgumentException
     * @throws UnexpectedValueException
     */
    public function isConnectedWith($name)
    {
        return $this->getAdapter($name)->isConnected();
    }

    /**
     * Returns a list of enabled adapters names
     *
     * @return array
     */
    public function getProviders()
    {
        $providers = [];

        foreach ($this->config['providers'] as $name => $config) {
            if ($config['enabled']) {
                $providers[] = $name;
            }
        }

        return $providers;
    }

    /**
     * Returns a list of currently connected adapters names
     *
     * @return array
     * @throws InvalidArgumentException
     * @throws UnexpectedValueException
     */
    public function getConnectedProviders()
    {
        $providers = [];

        foreach ($this->getProviders() as $name) {
            if ($this->isConnectedWith($name)) {
                $providers[] = $name;
            }
        }

        return $providers;
    }

    /**
     * Returns a list of new instances of currently connected adapters
     *
     * @return \Hybridauth\Adapter\AdapterInterface[]
     * @throws InvalidArgumentException
     * @throws UnexpectedValueException
     */
    public function getConnectedAdapters()
    {
        $adapters = [];

        foreach ($this->getProviders() as $name) {
            $adapter = $this->getAdapter($name);

            if ($adapter->isConnected()) {
                $adapters[$name] = $adapter;
            }
        }

        return $adapters;
    }

    /**
     * Disconnect all currently connected adapters at once
     */
    public function disconnectAllAdapters()
    {
        foreach ($this->getProviders() as $name) {
            $adapter = $this->getAdapter($name);

            if ($adapter->isConnected()) {
                $adapter->disconnect();
            }
        }
    }
}