<?php

namespace Colorfield\Mastodon;

use GuzzleHttp\Client;
use GuzzleHttp\ClientInterface;
use GuzzleHttp\Psr7\Request;

/**
 * Class MastodonOAuth.
 *
 * Usage: @todo
 */
class MastodonOAuth
{
	/** @var \Colorfield\Mastodon\ConfigurationVO */
	public $config;

	/** @var \GuzzleHttp\ClientInterface */
	private $client;


	/**
	 * Creates the OAuth object from the configuration.
	 */
	public function __construct(
		$client_name = ConfigurationVO::DEFAULT_NAME,
		$mastodon_instance = ConfigurationVO::DEFAULT_INSTANCE,
	) {
		$this->config = new ConfigurationVO($client_name, $mastodon_instance);

		/** @var \GuzzleHttp\Client client */
		$this->client = new Client();
	}


	/**
	 * Get response from the endpoint.
	 *
	 * @param $endpoint
	 * @param array $json
	 *
	 * @return mixed|null
	 */
	private function getResponse($endpoint, array $json)
	{
		$result = null;
		// endpoint
		$uri = $this->config->getBaseUrl() . $endpoint;
		try {
		    $response = $this->client->post(
		        $uri, [
		        'json' => $json,
		        ]
		    );
		    // @todo $request->getHeader('content-type')
		    if($response->getStatusCode() == '200') {
		        $result = json_decode($response->getBody(), true);
		    }else{
		        echo 'ERROR: Status code ' . $response->getStatusCode();
		    }
		    // @todo check thrown exception
		} catch (\Exception $exception) {
		    echo 'ERROR: ' . $exception->getMessage();
		}
		return $result;
	}


	/**
	 * Register the Mastodon application.
	 *
	 * Appends client_id and client_secret tp the configuration value object.
	 */
	public function registerApplication()
	{
		$options = $this->config->getAppConfiguration();
		$credentials = $this->getResponse(
		    '/api/'.ConfigurationVO::API_VERSION.'/apps',
		    $options
		);
		if (isset($credentials["client_id"])
		    && isset($credentials["client_secret"])
		) {
		    $this->config->setClientId($credentials['client_id']);
		    $this->config->setClientSecret($credentials['client_secret']);
		}else {
		    echo 'ERROR: no credentials in API response';
		}
	}


	/**
	 * Returns the authorization URL that will provide the authorization code"
	 * after manual approval.
	 *
	 * @return string
	 */
	public function getAuthorizationUrl()
	{
		$result = null;
		if (!$this->config->hasCredentials()) {
		    $this->registerApplication();
		}
		//Return the Authorization URL
		return "https://{$this->config->getMastodonInstance()}/oauth/authorize/?".http_build_query(
		    [
		    "response_type"    => "code",
		    // @todo review usage of singular / plural in redirect_uri
		    "redirect_uri"     => $this->config->getRedirectUris(),
		    "scope"            => $this->config->getScopes(),
		    "client_id"        => $this->config->getClientId(),
		    ]
		);
	}


	/**
	 * Gets the access token.
	 * As a side effect, stores it into the Configuration as bearer.
	 */
	public function getAccessToken()
	{
		$result = null;
		$options = $this->config->getAccessTokenConfiguration();
		$token = $this->getResponse('/oauth/token', $options);
		if (isset($token['access_token'])) {
		    $this->config->setBearer($token['access_token']);
		}else {
		    echo 'ERROR: no access token in API response';
		}
	}


	/**
	 * Authenticates a user.
	 *
	 * @param $email
	 * @param $password
	 */
	public function authenticateUser($email, $password)
	{
		if (empty($this->config->getBearer())) {
		    $this->getAccessToken();
		}
		// @todo validate email address and password
		$options = $this->config->getUserAuthenticationConfiguration(
		    $email,
		    $password
		);
		// @todo test, returns the bearer if success
		$token = $this->getResponse('/oauth/token', $options);
		$this->config->setBearer($token['access_token']);
		return $token;
	}
}
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