<?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/>.

namespace customfield_text;

/**
 * Class data
 *
 * @package   customfield_text
 * @copyright 2018 Daniel Neis Araujo <daniel@moodle.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class data_controller extends \core_customfield\data_controller {

    /**
     * Return the name of the field where the information is stored
     * @return string
     */
    public function datafield(): string {
        return 'charvalue';
    }

    /**
     * Add fields for editing a text field.
     *
     * @param \MoodleQuickForm $mform
     */
    public function instance_form_definition(\MoodleQuickForm $mform) {
        $field = $this->get_field();
        $config = $field->get('configdata');
        $type = $config['ispassword'] ? 'password' : 'text';
        $elementname = $this->get_form_element_name();
        $mform->addElement($type, $elementname, $this->get_field()->get_formatted_name(), 'size=' . (int)$config['displaysize']);
        $mform->setType($elementname, PARAM_TEXT);
        if (!empty($config['defaultvalue'])) {
            $mform->setDefault($elementname, $config['defaultvalue']);
        }
        if ($field->get_configdata_property('required')) {
            $mform->addRule($elementname, null, 'required', null, 'client');
        }
    }

    /**
     * Validates data for this field.
     *
     * @param array $data
     * @param array $files
     * @return array
     */
    public function instance_form_validation(array $data, array $files): array {

        $errors = parent::instance_form_validation($data, $files);
        $maxlength = $this->get_field()->get_configdata_property('maxlength');
        $elementname = $this->get_form_element_name();
        if (($maxlength > 0) && ($maxlength < \core_text::strlen($data[$elementname]))) {
            $errors[$elementname] = get_string('errormaxlength', 'customfield_text', $maxlength);
        }
        return $errors;
    }

    /**
     * Returns the default value as it would be stored in the database (not in human-readable format).
     *
     * @return mixed
     */
    public function get_default_value() {
        return $this->get_field()->get_configdata_property('defaultvalue');
    }

    /**
     * Returns value in a human-readable format
     *
     * @return mixed|null value or null if empty
     */
    public function export_value() {
        $value = parent::export_value();
        if ($value === null) {
            return null;
        }

        $link = $this->get_field()->get_configdata_property('link');
        if ($link) {
            $url = new \moodle_url(str_replace('$$', $this->get_value(), $link));
            $linktarget = $this->get_field()->get_configdata_property('linktarget');
            $attributes = $linktarget ? ['target' => $linktarget] : [];
            $value = \html_writer::link($url, $value, $attributes);
        }

        return $value;
    }
}