function bbp_admin_upgrade_group_forum_relationships() {

	// Define variables
	$bbp_db    = bbp_db();
	$statement = esc_html__( 'Upgrading BuddyPress group-forum relationships… %s', 'bbpress' );
	$g_count   = 0;
	$f_count   = 0;
	$s_count   = 0;

	// Copy the BuddyPress filter here, incase BuddyPress is not active
	$prefix            = apply_filters( 'bp_core_get_table_prefix', $bbp_db->base_prefix );
	$groups_table      = $prefix . 'bp_groups';
	$groups_meta_table = $prefix . 'bp_groups_groupmeta';

	// Get the converted forum IDs
	$forum_ids = $bbp_db->query( "SELECT `forum`.`ID`, `forummeta`.`meta_value`
								FROM `{$bbp_db->posts}` AS `forum`
									LEFT JOIN `{$bbp_db->postmeta}` AS `forummeta`
										ON `forum`.`ID` = `forummeta`.`post_id`
										AND `forummeta`.`meta_key` = '_bbp_old_forum_id'
								WHERE `forum`.`post_type` = '" . bbp_get_forum_post_type() . "'
								GROUP BY `forum`.`ID`" );

	// Bail if forum IDs returned an error
	if ( is_wp_error( $forum_ids ) || empty( $bbp_db->last_result ) ) {
		return array( 2, sprintf( $statement, esc_html__( 'Failed!', 'bbpress' ) ) );
	}

	// Stash the last results
	$results = $bbp_db->last_result;

	// Update each group forum
	foreach ( $results as $group_forums ) {

		// Only update if is a converted forum
		if ( empty( $group_forums->meta_value ) ) {
			continue;
		}

		// Attempt to update group meta
		$updated = $bbp_db->query( "UPDATE `{$groups_meta_table}` SET `meta_value` = '{$group_forums->ID}' WHERE `meta_key` = 'forum_id' AND `meta_value` = '{$group_forums->meta_value}'" );

		// Bump the count
		if ( ! empty( $updated ) && ! is_wp_error( $updated ) ) {
			++$g_count;
		}

		// Update group to forum relationship data
		$group_id = (int) $bbp_db->get_var( "SELECT `group_id` FROM `{$groups_meta_table}` WHERE `meta_key` = 'forum_id' AND `meta_value` = '{$group_forums->ID}'" );
		if ( ! empty( $group_id ) ) {

			// Update the group to forum meta connection in forums
			update_post_meta( $group_forums->ID, '_bbp_group_ids', array( $group_id ) );

			// Get the group status
			$group_status = $bbp_db->get_var( "SELECT `status` FROM `{$groups_table}` WHERE `id` = '{$group_id}'" );

			// Sync up forum visibility based on group status
			switch ( $group_status ) {

				// Public groups have public forums
				case 'public' :
					bbp_publicize_forum( $group_forums->ID );

					// Bump the count for output later
					++$s_count;
					break;

				// Private/hidden groups have hidden forums
				case 'private' :
				case 'hidden'  :
					bbp_hide_forum( $group_forums->ID );

					// Bump the count for output later
					++$s_count;
					break;
			}

			// Bump the count for output later
			++$f_count;
		}
	}

	// Make some logical guesses at the old group root forum
	if ( function_exists( 'bp_forums_parent_forum_id' ) ) {
		$old_default_forum_id = bp_forums_parent_forum_id();
	} elseif ( defined( 'BP_FORUMS_PARENT_FORUM_ID' ) ) {
		$old_default_forum_id = (int) BP_FORUMS_PARENT_FORUM_ID;
	} else {
		$old_default_forum_id = 1;
	}

	// Try to get the group root forum
	$posts = get_posts( array(
		'post_type'   => bbp_get_forum_post_type(),
		'meta_key'    => '_bbp_old_forum_id',
		'meta_type'   => 'NUMERIC',
		'meta_value'  => $old_default_forum_id,
		'numberposts' => 1
	) );

	// Found the group root forum
	if ( ! empty( $posts ) ) {

		// Rename 'Default Forum'  since it's now visible in sitewide forums
		if ( 'Default Forum' === $posts[0]->post_title ) {
			wp_update_post( array(
				'ID'         => $posts[0]->ID,
				'post_title' => esc_html__( 'Group Forums', 'bbpress' ),
				'post_name'  => esc_html__( 'group-forums', 'bbpress' ),
			) );
		}

		// Update the group forums root metadata
		update_option( '_bbp_group_forums_root_id', $posts[0]->ID );
	}

	// Remove old bbPress 1.1 roles (BuddyPress)
	remove_role( 'member'    );
	remove_role( 'inactive'  );
	remove_role( 'blocked'   );
	remove_role( 'moderator' );
	remove_role( 'keymaster' );

	// Complete results
	$result = sprintf( esc_html__( 'Complete! %s groups updated; %s forums updated; %s forum statuses synced.', 'bbpress' ), bbp_number_format( $g_count ), bbp_number_format( $f_count ), bbp_number_format( $s_count ) );
	return array( 0, sprintf( $statement, $result ) );
}