cx-newsletter/activities/3-manage_messages_activity.php

<?php

namespace cx_newsletter;

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

    public function inside_buttons() : array {
        return [ 'remove' ];
    }

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

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

    public function remove(messages_mapper $mapper) : void {
        if (!$this->is_validated('id')) {
            $this->error_toast('ID of the message is wrong.');
        }

        $message = new message($this->get_validated('id'));

        try {
            $mapper->remove($message);
            $this->success_toast('Removed success.');
        } catch (\exception $exception) {
            $this->error_toast($exception->getMessage());
        }
    }

    private function load_groups() : \cx_appengine\string_builder {
        $mapper = new groups_mapper(
            $this->get_database(),
            $this->get_tables()
        );

        $default = new group();
        $default->name = 'ALL';
        $groups = $mapper->load_all();
        $list = new \cx_appengine\string_builder();
        array_push($groups, $default);

        foreach ($groups as $group) {
            $options = [];
            $options['group_name'] = $group->name;

            if ($group->has_id()) {
                $options['group_id'] = $group->get_id();
            } else {
                $options['group_id'] = 'NULL';
                $options['selected'] = 'selected';
            }

            $list->push(
                $this
                ->get_templates()
                ->prepare('single_group_option')
                ->render($options)
            );
        }

        return $list;
    }

    public function process() : self {
        $converter = new messages_converter();
        $messages = new \cx_appengine\string_builder();
        
        $mapper = new messages_mapper(
            $this->get_database(), 
            $this->get_tables()
        );

        if ($this->is_received('remove')) {
            $this->remove($mapper);
        }
       
        $groups = $this->load_groups();

        foreach ($mapper->load_all() as $message) {
            $options = $converter->load_object($message)->get_array();
            $options['groups'] = $groups;

            $messages->push(
                $this
                ->get_templates()
                ->prepare('manage_messages_single_message')
                ->render($options)
            );
        }

        $this->set('messages_place', $messages); 
        
        return $this;
    }
}