<?php
/**
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

/**
 * Base class for RC feed engines that send messages in a freely configurable
 * format to a uri-addressed engine set in $wgRCEngines.
 * @since 1.29
 */
abstract class FormattedRCFeed extends RCFeed {
	private $params;

	/**
	 * @param array $params
	 *  - 'uri'
	 *  - 'formatter'
	 * @see $wgRCFeeds
	 */
	public function __construct( array $params = [] ) {
		$this->params = $params;
	}

	/**
	 * Send some text to the specified feed.
	 *
	 * @param array $feed The feed, as configured in an associative array
	 * @param string $line The text to send
	 * @return bool Success
	 */
	abstract public function send( array $feed, $line );

	/**
	 * @param RecentChange $rc
	 * @param string|null $actionComment
	 * @return bool Success
	 */
	public function notify( RecentChange $rc, $actionComment = null ) {
		$params = $this->params;
		/** @var RCFeedFormatter $formatter */
		$formatter = is_object( $params['formatter'] ) ? $params['formatter'] : new $params['formatter'];

		$line = $formatter->getLine( $params, $rc, $actionComment );
		if ( !$line ) {
			// @codeCoverageIgnoreStart
			// T109544 - If a feed formatter returns null, this will otherwise cause an
			// error in at least RedisPubSubFeedEngine. Not sure best to handle this.
			return;
			// @codeCoverageIgnoreEnd
		}
		return $this->send( $params, $line );
	}
}