settings.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Add page to admin menu.
 *
 * @package   local_debugtoolbar
 * @copyright 2023 Université Rennes 2 <dsi-contact@univ-rennes2.fr>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

use local_debugtoolbar\setting\admin_setting_plugin_activation;

defined('MOODLE_INTERNAL') || die;

if ($hassiteconfig) {
    $settings = new admin_settingpage('local_debugtoolbar', new lang_string('pluginname', 'local_debugtoolbar'));
    $ADMIN->add('localplugins', $settings);

    // Note : We always add the custom admin_settingpage to the tree, but the actual settings are added to that page
    // only when $ADMIN->fulltree is set. This is to improve performance when the caller does not need the actual settings
    // but only the administration pages structure (source : https://moodledev.io/docs/4.4/apis/subsystems/admin).
    if ($ADMIN->fulltree) {
        // Add warnings about usage.
        $attributes = ['class' => 'alert alert-warning'];
        $content = html_writer::tag('div', new lang_string('usage_warning', 'local_debugtoolbar'), $attributes);
        $settings->add(new admin_setting_heading('local_debugtoolbar/header', new lang_string('settings'), $content));

        // Add a checkbox to enable/disable module.
        $name = 'local_debugtoolbar/enable';
        $label = new lang_string('enable_debugtoolbar', 'local_debugtoolbar');
        $description = '';
        $default = 0;
        $settings->add(new admin_setting_plugin_activation($name, $label, $description, $default));

        // Add a checkbox to enable/disable error handler.
        $name = 'local_debugtoolbar/enable_error_handler';
        $label = new lang_string('enable_error_handler', 'local_debugtoolbar');
        $description = new lang_string('enable_error_handler_description', 'local_debugtoolbar');
        $default = 0;
        $settings->add(new admin_setting_configcheckbox($name, $label, $description, $default));

        // Add a field to set execution time warning threshold.
        $name = 'local_debugtoolbar/realtime_warning_threshold';
        $label = new lang_string('realtime_warning_threshold', 'local_debugtoolbar');
        $description = new lang_string('realtime_warning_threshold_description', 'local_debugtoolbar');
        $default = .2;
        $settings->add(new admin_setting_configtext($name, $label, $description, $default, PARAM_FLOAT));

        // Add a field to set execution time critical threshold.
        $name = 'local_debugtoolbar/realtime_critical_threshold';
        $label = new lang_string('realtime_critical_threshold', 'local_debugtoolbar');
        $description = new lang_string('realtime_critical_threshold_description', 'local_debugtoolbar');
        $default = 2;
        $settings->add(new admin_setting_configtext($name, $label, $description, $default, PARAM_FLOAT));

        // Add a field to set database queries warning threshold.
        $name = 'local_debugtoolbar/dbqueries_warning_threshold';
        $label = new lang_string('dbqueries_warning_threshold', 'local_debugtoolbar');
        $description = new lang_string('dbqueries_warning_threshold_description', 'local_debugtoolbar');
        $default = 50;
        $settings->add(new admin_setting_configtext($name, $label, $description, $default, PARAM_INT));

        // Add a field to set database queries critical threshold.
        $name = 'local_debugtoolbar/dbqueries_critical_threshold';
        $label = new lang_string('dbqueries_critical_threshold', 'local_debugtoolbar');
        $description = new lang_string('dbqueries_critical_threshold_description', 'local_debugtoolbar');
        $default = 100;
        $settings->add(new admin_setting_configtext($name, $label, $description, $default, PARAM_INT));
    }
}