cx-newsletter/activities/9-manage_groups_activity.php

<?php

namespace cx_newsletter;
use \cx_appengine\string_builder;
use \exception;

class manage_groups_activity
extends activity {
    public function show_after_button() : null {
        return null;
    }

    public function get_site_template_name() : string {
        return 'manage_groups';
    }

    public function inside_buttons() : array {
        return [ 'delete', 'save', 'add' ];
    }

    public function inside_inputs() : array {
        return [
            'id' => 'int',
            'name' => 'string'
        ];
    }

    public function process() : self {
        if ($this->is_received('save')) {
            $this->save();    
        }

        if ($this->is_received('add')) {
            $this->add();
        }

        if ($this->is_received('delete')) {
            $this->delete();
        }

        $this->set('groups', $this->load_groups());
        
        return $this;
    }

    private function save() : void {
        try {
            $group = new group($this->get_validated('id'));
            $group->prepare_name($this->get_validated('name'));
            $this->get_mapper()->save($group);
        } catch (exception $exception) {
            $error = 'An error exception when saving group. More info: ';
            $error .= $exception->getMessage();

            $this->error_toast($error);
        }
    }   

    private function add() : void {
        try {
            $group = new group();
            $group->prepare_name($this->get_validated('name'));
    
            $this->get_mapper()->create($group);
        } catch (exception $exception) {
            $error = 'An error exception when saving group. More info: ';
            $error .= $exception->getMessage();

            $this->error_toast($error);
        }
    }

    private function delete() : void {
        try {   
            $group = new group($this->get_validated('id'));

            $this->get_mapper()->remove($group);
        } catch (exception $exception) {
            $error = 'An error exception when removing group. More info: ';
            $error .= $exception->getMessage();

            $this->error_toast($error);
        }
    }

    private function load_groups() : string_builder {
        $converter = new group_converter();        
        $groups = new string_builder();

        foreach ($this->get_mapper()->load_all() as $group) {
            $groups->push(
                $this
                ->get_templates()
                ->prepare('single_group')
                ->render($converter->load_object($group)->get_array())
            );
        }

        return $groups;
    }

    private function get_mapper() : groups_mapper {
        return new groups_mapper(
            $this->get_database(),
            $this->get_tables()
        );
    }
}