BP_Messages_Component::setup_nav( array $main_nav = array(), array $sub_nav = array() )

	public function setup_nav( $main_nav = array(), $sub_nav = array() ) {

		// Determine user to use.
		if ( bp_displayed_user_domain() ) {
			$user_domain = bp_displayed_user_domain();
		} elseif ( bp_loggedin_user_domain() ) {
			$user_domain = bp_loggedin_user_domain();
		} else {
			return;
		}

		$access        = bp_core_can_edit_settings();
		$slug          = bp_get_messages_slug();
		$messages_link = trailingslashit( $user_domain . $slug );

		// Only grab count if we're on a user page and current user has access.
		if ( bp_is_user() && bp_user_has_access() ) {
			$count    = bp_get_total_unread_messages_count( bp_displayed_user_id() );
			$class    = ( 0 === $count ) ? 'no-count' : 'count';
			$nav_name = sprintf(
				/* translators: %s: Unread message count for the current user */
				__( 'Messages %s', 'buddyboss' ),
				sprintf(
					'<span class="%s">%s</span>',
					esc_attr( $class ),
					bp_core_number_format( $count )
				)
			);
		} else {
			$nav_name = __( 'Messages', 'buddyboss' );
		}

		// Add 'Messages' to the main navigation.
		$main_nav = array(
			'name'                    => $nav_name,
			'slug'                    => $slug,
			'position'                => 50,
			'show_for_displayed_user' => $access,
			'screen_function'         => 'messages_screen_inbox',
			'default_subnav_slug'     => 'inbox',
			'item_css_id'             => $this->id
		);

		// Add the subnav items to the profile.
		$sub_nav[] = array(
			'name'            => __( 'Messages', 'buddyboss' ),
			'slug'            => 'inbox',
			'parent_url'      => $messages_link,
			'parent_slug'     => $slug,
			'screen_function' => 'messages_screen_inbox',
			'position'        => 10,
			'user_has_access' => $access
		);

		// Show certain screens only if the current user is the displayed user.
		if ( bp_is_my_profile() ) {

			// Show "Compose" on the logged-in user's profile only.
			$sub_nav[] = array(
				'name'            => __( 'New Message', 'buddyboss' ),
				'slug'            => 'compose',
				'parent_url'      => $messages_link,
				'parent_slug'     => $slug,
				'screen_function' => 'messages_screen_compose',
				'position'        => 30,
				'user_has_access' => $access
			);

			/*
			 * Show "Notices" on the logged-in user's profile only
			 * and then only if the user can create notices.
			 */
			if ( bp_current_user_can( 'bp_moderate' ) ) {
				$sub_nav[] = array(
					'name'            => __( 'Notices', 'buddyboss' ),
					'slug'            => 'notices',
					'parent_url'      => $messages_link,
					'parent_slug'     => $slug,
					'screen_function' => 'messages_screen_notices',
					'position'        => 90,
					'user_has_access' => true
				);
			}
		}

		parent::setup_nav( $main_nav, $sub_nav );
	}