Buddypress group tab

<?php

if ( class_exists( 'BP_Group_Extension' ) ) : // Recommended, to prevent problems during upgrade or when Groups are disabled

    class Group_tab1 extends BP_Group_Extension {

        function __construct() {
            $this->name = 'Group tab1';
            $this->slug = 'group-tab1';

            $this->create_step_position = 21;
            $this->nav_item_position = 31;

            $this->enable_create_step = false;
        }

        function settings_save( $group_id ) {
            global $bp, $wpdb;

            $plain_fields = array(
                'field-1'
        //      'field-2',
        //      'field-3'
            );

            foreach( $plain_fields as $field ) {
                $key = 'group-tab1-' . $field;
                if ( isset( $_POST[$key] ) ) {
                    $value = $_POST[$key];
                    groups_update_groupmeta( $group_id, 'group-tab1-' . $field, $value );
                }
            }

        }

        /**
         * The content of the My Group Extension tab of the group admin
         */
        function edit_screen() {
            if ( !bp_is_group_admin_screen( $this->slug ) )
                return false; ?>

            <h2><?php echo esc_attr( $this->name ) ?></h2>

            <p>Edit steps here</p>

            <label for="group-tab1-field-1">Field Title* <i>editable</i></label>
            <input type="text" name="group-tab1-field-1" id="group-tab1-field-1" value="<?php echo get_group_tab1_field_1(); ?>" />

            <input type="submit" name="save" value="Save" />

            <?php
            wp_nonce_field( 'groups_edit_save_' . $this->slug );
        }

        /**
         * The routine run after the user clicks Save from your admin tab
         *
         * You'll be pulling your data out of the $_POST global. Be sure to
         * sanitize as necessary.
         */
        function edit_screen_save() {
            global $bp;

            if ( !isset( $_POST['save'] ) )
                return false;

            check_admin_referer( 'groups_edit_save_' . $this->slug );

            /* Insert your edit screen save code here */
            $this->settings_save( $bp->groups->current_group->id );
            /* Need to work this */
            $success = true;

            /* To post an error/success message to the screen, use the following */
            if ( !$success )
                bp_core_add_message( __( 'There was an error saving, please try again', 'buddypress' ), 'error' );
            else
                bp_core_add_message( __( 'Settings saved successfully', 'buddypress' ) );

            bp_core_redirect( bp_get_group_permalink( $bp->groups->current_group ) . 'admin/' . $this->slug );
        }

        /**
         * Use this function to display the actual content of your group extension when the nav item is selected
         */
        function display() {
            ?>

            <p>Welcome to my cool group-tab1 extension!</p>

            <?php
        }
    }

        function get_group_tab1_field_1() {
            global $bp, $wpdb;
            $field_1_meta = groups_get_groupmeta( $bp->groups->current_group->id, 'group-tab1-field-1' );
            return $field_1_meta;
        }

    bp_register_group_extension( 'Group_Tab1' );

endif; // class_exists( 'BP_Group_Extension' )