<?php
/**
 * ActivityPub Outbox Class
 *
 * @author Matthias Pfefferle
 */
class Activitypub_Outbox {
	/**
	 * Register routes
	 */
	public static function register_routes() {
		register_rest_route(
			'activitypub/1.0', '/users/(?P<id>\d+)/outbox', array(
				array(
					'methods'  => WP_REST_Server::READABLE,
					'callback' => array( 'Activitypub_Outbox', 'get' ),
					'args'     => self::request_parameters(),
				),
			)
		);
	}

	public static function get( $request ) {
		$author_id = $request->get_param( 'id' );
		$author    = get_user_by( 'ID', $author_id );

		if ( ! $author ) {
			return new WP_Error( 'rest_invalid_param', __( 'User not found', 'activitypub' ), array(
				'status' => 404, 'params' => array(
					'user_id' => __( 'User not found', 'activitypub' )
				)
			) );
		}

		$page = $request->get_param( 'page' );

		/*
		 * Action triggerd prior to the ActivityPub profile being created and sent to the client
		 */
		do_action( 'activitypub_outbox_pre' );

		$json = new stdClass();

		$json->{'@context'} = array(
			'https://www.w3.org/ns/activitystreams',
			'https://w3id.org/security/v1',
			array(
				'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
				'sensitive' => 'as:sensitive',
				'movedTo' => array(
					'@id' => 'as:movedTo',
					'@type' => '@id',
				),
				'Hashtag' => 'as:Hashtag',
				'ostatus' => 'http://ostatus.org#',
				'atomUri' => 'ostatus:atomUri',
				'inReplyToAtomUri' => 'ostatus:inReplyToAtomUri',
				'conversation' => 'ostatus:conversation',
				'toot' => 'http://joinmastodon.org/ns#',
				'Emoji' => 'toot:Emoji',
				'focalPoint' => array(
					'@container' => '@list',
					'@id' => 'toot:focalPoint',
				),
				'featured' => array(
					'@id' => 'toot:featured',
					'@type' => '@id',
				),
				'schema' => 'http://schema.org#',
				'PropertyValue' => 'schema:PropertyValue',
				'value' => 'schema:value',
			),
		);

		$json->id = home_url( add_query_arg( NULL, NULL ) );
		$json->generator = 'http://wordpress.org/?v=' . get_bloginfo_rss( 'version' );
		$json->actor = get_author_posts_url( $author_id );
		$json->type = 'OrderedCollectionPage';
		$json->partOf = get_rest_url( null, "/activitypub/1.0/users/$author_id/outbox" ); // phpcs:ignore

		$count_posts = wp_count_posts();
		$json->totalItems = intval( $count_posts->publish );

		$posts = get_posts( array(
			'author' => $author_id,
			'offset' => $page,
		) );

		$json->first = add_query_arg( 'page', 0, $json->partOf );
		$json->last  = add_query_arg( 'page', ( ceil ( $json->totalItems / 10 ) ) - 1, $json->partOf );

		if ( ( ceil ( $json->totalItems / 10 ) ) - 1 > $page ) {
			$json->next  = add_query_arg( 'page', ++$page, $json->partOf );
		}

		foreach ( $posts as $post ) {
			$json->orderedItems[] = self::post_to_json( $post ); // phpcs:ignore
		}

		// filter output
		$json = apply_filters( 'activitypub_outbox_array', $json );

		/*
		 * Action triggerd after the ActivityPub profile has been created and sent to the client
		 */
		do_action( 'activitypub_outbox_post' );

		$response = new WP_REST_Response( $json, 200 );

		$response->header( 'Content-Type', 'application/activity+json' );

		return $response;
	}

	public static function request_parameters() {
		$params = array();

		$params['page'] = array(
			'type' => 'integer',
		);

		$params['id'] = array(
			'required' => true,
			'type' => 'integer',
		);

		return $params;
	}
}