<?php
/**
 * @brief		IndexNow Submission Class
 * @since		11 Jan 2022
 */

namespace IPS\core;

/* To prevent PHP errors (extending class does not exist) revealing path */
if ( !\defined( '\IPS\SUITE_UNIQUE_KEY' ) )
{
	header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
	exit;
}

/**
 * IndexNow class
 *
 * Submits the content to indexnow - https://www.indexnow.org/documentation
 *
 * The submission should always happen via the queue system!
 */
class _IndexNow extends \IPS\Patterns\Singleton
{
	/**
	 * @brief	Singleton Instances
	 */
	protected static $instance = NULL;

	/**
	 * @brief Target URL for the API Request
	 *
	 * @var string
	 */
	static $apiUrl = "https://api.indexnow.org/indexnow/";

	/**
	 * Is the extension enabled?
	 *
	 * @return bool
	 */
	public function isEnabled(): bool
	{
		return (bool) \IPS\Settings::i()->indexnow_enabled;
	}

	/**
	 * Queues a URL to be sent to indexnow
	 *
	 * @param $url
	 * @return void
	 */
	public static function addUrlToQueue( $url )
	{
		static::addUrlsToQueue([ $url ] );
	}

	/**
	 * Queues an array with URLs to be sent to indexnow
	 *
	 * @param array $urls
	 * @return void
	 */
	public static function addUrlsToQueue( array $urls )
	{
		$obj = static::i();
		if( $obj->isEnabled() )
		{
			\IPS\Task::queue( 'core', 'IndexNow', [ 'urls' => array_map('strval', $urls) ] );
		}
	}

	/**
	 * Sends all the urls in the queue to indexnow
	 *
	 * @return void
	 */
	public function send( array $urls )
	{
		/* Move on if there's nothing to send */
		if( !\count( $urls ) )
		{
			return;
		}

		$url = \IPS\Http\Url::internal( '', 'front' );
		$data = array(
			'host'         => \IPS\Http\Url::baseUrl(\IPS\Http\Url::PROTOCOL_WITHOUT ),
			'key'          => \IPS\Settings::i()->indexnow_key,
			'keyLocation'  => (string) $url->setPath( $url->data[ \IPS\Http\Url::COMPONENT_PATH ] .  $this->getKeyFileName() ),
			'urlList'     => $urls,
		);


		try {
			$response = \IPS\Http\Url::external(static::$apiUrl)->request()
				->setHeaders(array('Content-Type' => 'application/json'))->post(json_encode($data));
			if (!$response->isSuccessful()) {
				switch ($response->httpResponseCode) {
					case 400:
						$error = 'invalid_request';
						break;
					case 403:
						$error = 'invalid_api_key';
						break;
					case 422:
						$error = 'invalid_url';
						break;
					case 429:
					default:
						$error = 'unknown_error';
				}
				\IPS\Log::log($response->httpResponseCode . ' ' . $error . ' ' . print_r($data, TRUE), 'IndexNow');
			}
		} catch (\IPS\Http\Request\CurlException $e)
		{
			\IPS\Log::log($e->getMessage(), 'IndexNow');
		}
	}

	/**
	 * Return the indexnow verification file name
	 *
	 * @return string
	 */
	public function getKeyFileName(): string
	{
		return \IPS\Settings::i()->indexnow_key . '.txt';
	}

	/**
	 * Return the indexnow verification file content, which is literally only the key!
	 *
	 * @return string
	 */
	public function getKeyfileContent(): string
	{
		return \IPS\Settings::i()->indexnow_key;
	}
}