bbp_spam_topic( int $topic_id )

function bbp_spam_topic( $topic_id = 0 ) {

	// Get the topic
	$topic = bbp_get_topic( $topic_id );
	if ( empty( $topic ) )
		return $topic;

	// Bail if topic is spam
	if ( bbp_get_spam_status_id() === $topic->post_status )
		return false;

	// Execute pre spam code
	do_action( 'bbp_spam_topic', $topic_id );

	/** Trash Replies *********************************************************/

	// Topic is being spammed, so its replies are trashed
	$replies = new WP_Query( array(
		'suppress_filters' => true,
		'post_type'        => bbp_get_reply_post_type(),
		'post_status'      => bbp_get_public_status_id(),
		'post_parent'      => $topic_id,
		'posts_per_page'   => -1,
		'nopaging'         => true,
		'fields'           => 'id=>parent'
	) );

	if ( !empty( $replies->posts ) ) {

		// Prevent debug notices
		$pre_spammed_replies = array();

		// Loop through replies, trash them, and add them to array
		foreach ( $replies->posts as $reply ) {
			wp_trash_post( $reply->ID );
			$pre_spammed_replies[] = $reply->ID;
		}

		// Set a post_meta entry of the replies that were trashed by this action.
		// This is so we can possibly untrash them, without untrashing replies
		// that were purposefully trashed before.
		update_post_meta( $topic_id, '_bbp_pre_spammed_replies', $pre_spammed_replies );

		// Reset the $post global
		wp_reset_postdata();
	}

	// Cleanup
	unset( $replies );

	/** Topic Tags ************************************************************/

	// Add the original post status as post meta for future restoration
	add_post_meta( $topic_id, '_bbp_spam_meta_status', $topic->post_status );

	// Get topic tags
	$terms = get_the_terms( $topic_id, bbp_get_topic_tag_tax_id() );

	// Define local variable(s)
	$term_names = array();

	// Topic has tags
	if ( !empty( $terms ) ) {

		// Loop through and collect term names
		foreach ( $terms as $term ) {
			$term_names[] = $term->name;
		}

		// Topic terms have slugs
		if ( !empty( $term_names ) ) {

			// Add the original post status as post meta for future restoration
			add_post_meta( $topic_id, '_bbp_spam_topic_tags', $term_names );

			// Empty the topic of its tags
			$topic->tax_input = array( bbp_get_topic_tag_tax_id() => '' );
		}
	}

	// Set post status to spam
	$topic->post_status = bbp_get_spam_status_id();

	// No revisions
	remove_action( 'pre_post_update', 'wp_save_post_revision' );

	// Update the topic
	$topic_id = wp_update_post( $topic );

	// Execute post spam code
	do_action( 'bbp_spammed_topic', $topic_id );

	// Return topic_id
	return $topic_id;
}