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✏️ Editing: user_profile_fields.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/>.

declare(strict_types=1);

namespace core_reportbuilder\local\helpers;

use context_system;
use core_text;
use core_reportbuilder\local\filters\boolean_select;
use core_reportbuilder\local\filters\date;
use core_reportbuilder\local\filters\select;
use core_reportbuilder\local\filters\text;
use core_reportbuilder\local\report\column;
use core_reportbuilder\local\report\filter;
use lang_string;
use profile_field_base;
use stdClass;

defined('MOODLE_INTERNAL') || die();

global $CFG;
require_once($CFG->dirroot.'/user/profile/lib.php');

/**
 * Helper class for user profile fields.
 *
 * @package   core_reportbuilder
 * @copyright 2021 David Matamoros <davidmc@moodle.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class user_profile_fields {

/** @var array user profile fields */
    private $userprofilefields;

/** @var string $entityname Name of the entity */
    private $entityname;

/** @var int $usertablefieldalias The user table/field alias */
    private $usertablefieldalias;

/** @var array additional joins */
    private $joins = [];

/**
     * Class userprofilefields constructor.
     *
     * @param string $usertablefieldalias The user table/field alias used when adding columns and filters.
     * @param string $entityname The entity name used when adding columns and filters.
     */
    public function __construct(string $usertablefieldalias, string $entityname) {
        $this->usertablefieldalias = $usertablefieldalias;
        $this->entityname = $entityname;
        $this->userprofilefields = $this->get_user_profile_fields();
    }

/**
     * Retrieves the list of available/visible user profile fields
     *
     * @return profile_field_base[]
     */
    private function get_user_profile_fields(): array {
        return array_filter(profile_get_user_fields_with_data(0), static function(profile_field_base $profilefield): bool {
            return $profilefield->is_visible();
        });
    }

/**
     * Additional join that is needed.
     *
     * @param string $join
     * @return self
     */
    public function add_join(string $join): self {
        $this->joins[trim($join)] = trim($join);
        return $this;
    }

/**
     * Additional joins that are needed.
     *
     * @param array $joins
     * @return self
     */
    public function add_joins(array $joins): self {
        foreach ($joins as $join) {
            $this->add_join($join);
        }
        return $this;
    }

/**
     * Return joins
     *
     * @return string[]
     */
    private function get_joins(): array {
        return array_values($this->joins);
    }

/**
     * Get table alias for given profile field
     *
     * The entity name is used to ensure the alias differs when the entity is used multiple times within the same report, each
     * having their own table alias/join
     *
     * @param profile_field_base $profilefield
     * @return string
     */
    private function get_table_alias(profile_field_base $profilefield): string {
        static $aliases = [];

$aliaskey = "{$this->entityname}_{$profilefield->fieldid}";
        if (!array_key_exists($aliaskey, $aliases)) {
            $aliases[$aliaskey] = database::generate_alias();
        }

return $aliases[$aliaskey];
    }

/**
     * Get table join for given profile field
     *
     * @param profile_field_base $profilefield
     * @return string
     */
    private function get_table_join(profile_field_base $profilefield): string {
        $userinfotablealias = $this->get_table_alias($profilefield);

return "LEFT JOIN {user_info_data} {$userinfotablealias}
                       ON {$userinfotablealias}.userid = {$this->usertablefieldalias}
                      AND {$userinfotablealias}.fieldid = {$profilefield->fieldid}";
    }

/**
     * Return the user profile fields visible columns.
     *
     * @return column[]
     */
    public function get_columns(): array {
        global $DB;

$columns = [];
        foreach ($this->userprofilefields as $profilefield) {
            $columntype = $this->get_user_field_type($profilefield->field->datatype);
            $columnfieldsql = $this->get_table_alias($profilefield) . '.data';

// Numeric (checkbox/time) fields should be cast, as should all fields for Oracle, for aggregation support.
            if ($columntype === column::TYPE_BOOLEAN || $columntype === column::TYPE_TIMESTAMP) {
                $columnfieldsql = "CASE WHEN {$columnfieldsql} IS NULL THEN NULL ELSE " .
                    $DB->sql_cast_char2int($columnfieldsql, true) . " END";
            } else if ($DB->get_dbfamily() === 'oracle') {
                $columnfieldsql = $DB->sql_order_by_text($columnfieldsql, 1024);
            }

$columns[] = (new column(
                'profilefield_' . core_text::strtolower($profilefield->field->shortname),
                new lang_string('customfieldcolumn', 'core_reportbuilder',
                    format_string($profilefield->field->name, true,
                        ['escape' => false, 'context' => context_system::instance()])),
                $this->entityname
            ))
                ->add_joins($this->get_joins())
                ->add_join($this->get_table_join($profilefield))
                ->add_field($columnfieldsql, 'data')
                ->set_type($columntype)
                ->set_is_sortable($columntype !== column::TYPE_LONGTEXT)
                ->add_callback(static function($value, stdClass $row, profile_field_base $field): string {
                    if ($value === null) {
                        return '';
                    }

$field->data = $value;
                    return (string) $field->display_data();
                }, $profilefield);
        }

return $columns;
    }

/**
     * Get custom user profile fields filters.
     *
     * @return filter[]
     */
    public function get_filters(): array {
        global $DB;

$filters = [];
        foreach ($this->userprofilefields as $profilefield) {
            $field = $this->get_table_alias($profilefield) . '.data';
            $params = [];

switch ($profilefield->field->datatype) {
                case 'checkbox':
                    $classname = boolean_select::class;
                    $fieldsql = "COALESCE(" . $DB->sql_cast_char2int($field, true) . ", 0)";
                    break;
                case 'datetime':
                    $classname = date::class;
                    $fieldsql = $DB->sql_cast_char2int($field, true);
                    break;
                case 'menu':
                    $classname = select::class;

$emptyparam = database::generate_param_name();
                    $fieldsql = "COALESCE(" . $DB->sql_compare_text($field, 255) . ", :{$emptyparam})";
                    $params[$emptyparam] = '';

break;
                case 'text':
                case 'textarea':
                default:
                    $classname = text::class;

$emptyparam = database::generate_param_name();
                    $fieldsql = "COALESCE(" . $DB->sql_compare_text($field, 255) . ", :{$emptyparam})";
                    $params[$emptyparam] = '';

break;
            }

$filter = (new filter(
                $classname,
                'profilefield_' . core_text::strtolower($profilefield->field->shortname),
                new lang_string('customfieldcolumn', 'core_reportbuilder',
                    format_string($profilefield->field->name, true,
                        ['escape' => false, 'context' => context_system::instance()])),
                $this->entityname,
                $fieldsql,
                $params
            ))
                ->add_joins($this->get_joins())
                ->add_join($this->get_table_join($profilefield));

// If menu type then set filter options as appropriate.
            if ($profilefield->field->datatype === 'menu') {
                $filter->set_options($profilefield->options);
            }

$filters[] = $filter;
        }

return $filters;
    }

/**
     * Get user profile field type for report.
     *
     * @param string $userfield user field.
     * @return int the constant equivalent to this custom field type.
     */
    protected function get_user_field_type(string $userfield): int {
        switch ($userfield) {
            case 'checkbox':
                $customfieldtype = column::TYPE_BOOLEAN;
                break;
            case 'datetime':
                $customfieldtype = column::TYPE_TIMESTAMP;
                break;
            case 'textarea':
                $customfieldtype = column::TYPE_LONGTEXT;
                break;
            case 'menu':
            case 'text':
            default:
                $customfieldtype = column::TYPE_TEXT;
                break;
        }
        return $customfieldtype;
    }
}

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