<?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/>.

/**
 * Surveypro pluginform class.
 *
 * @package   surveyprofield_date
 * @copyright 2013 onwards kordan <stringapiccola@gmail.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace surveyprofield_date;

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

use mod_surveypro\utility_item;
use mod_surveypro\local\form\item_setupbaseform;

require_once($CFG->dirroot . '/lib/formslib.php');
require_once($CFG->dirroot . '/mod/surveypro/field/date/lib.php');

/**
 * The class representing the plugin form
 *
 * @package   surveyprofield_date
 * @copyright 2013 onwards kordan <stringapiccola@gmail.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class itemsetupform extends item_setupbaseform
{
    /**
     * Definition.
     *
     * @return void
     */
    public function definition() {
        // Start with common section of the form.
        parent::definition();

        $mform = $this->_form;

        // Get _customdata.
        $item = $this->_customdata['item'];

        $startyear = $item->surveypro->startyear;
        $stopyear = $item->surveypro->stopyear;

        // Item: defaultoption.
        $fieldname = 'defaultoption';
        $daysrange = range(1, 31);
        $days = array_combine($daysrange, $daysrange);
        $months = [];
        for ($i = 1; $i <= 12; $i++) {
            $months[$i] = userdate(mktime(12, 0, 0, $i, 1, 2000), "%B", 0); // January, February, March...
        }
        $yearsrange = range($startyear, $stopyear);
        $years = array_combine($yearsrange, $yearsrange);

        $customdefaultstr = get_string('customdefault', 'surveyprofield_date');
        $currentdatedefaultstr = get_string('currentdatedefault', 'surveyprofield_date');
        $invitedefaultstr = get_string('invitedefault', 'mod_surveypro');
        $likelaststr = get_string('likelast', 'mod_surveypro');
        $noanswerstr = get_string('noanswer', 'mod_surveypro');
        $elementgroup = [];
        $elementgroup[] = $mform->createElement('radio', $fieldname, '', $customdefaultstr, SURVEYPRO_CUSTOMDEFAULT);
        $elementgroup[] = $mform->createElement('radio', $fieldname, '', $currentdatedefaultstr, SURVEYPRO_TIMENOWDEFAULT);
        $elementgroup[] = $mform->createElement('radio', $fieldname, '', $invitedefaultstr, SURVEYPRO_INVITEDEFAULT);
        $elementgroup[] = $mform->createElement('radio', $fieldname, '', $likelaststr, SURVEYPRO_LIKELASTDEFAULT);
        $elementgroup[] = $mform->createElement('radio', $fieldname, '', $noanswerstr, SURVEYPRO_NOANSWERDEFAULT);
        $mform->addGroup($elementgroup, $fieldname . '_group', get_string($fieldname, 'surveyprofield_date'), ' ', false);
        $mform->setDefault($fieldname, SURVEYPRO_INVITEDEFAULT);
        $mform->addHelpButton($fieldname . '_group', $fieldname, 'surveyprofield_date');

        // Item: defaultvalue.
        $fieldname = 'defaultvalue';
        $elementgroup = [];
        $elementgroup[] = $mform->createElement('select', $fieldname . 'day', '', $days);
        $elementgroup[] = $mform->createElement('select', $fieldname . 'month', '', $months);
        $elementgroup[] = $mform->createElement('select', $fieldname . 'year', '', $years);
        $mform->addGroup($elementgroup, $fieldname . '_group', null, ' ', false);
        $mform->disabledIf($fieldname . '_group', 'defaultoption', 'neq', SURVEYPRO_CUSTOMDEFAULT);
        $mform->setDefault($fieldname . 'day', '1');
        $mform->setDefault($fieldname . 'month', '1');
        $mform->setDefault($fieldname . 'year', $startyear);

        // Item: downloadformat.
        $fieldname = 'downloadformat';
        $options = $item->get_downloadformats();
        $mform->addElement('select', $fieldname, get_string($fieldname, 'surveyprofield_date'), $options);
        $mform->setDefault($fieldname, $item->get_friendlyformat());
        $mform->addHelpButton($fieldname, $fieldname, 'surveyprofield_date');

        // Here I open a new fieldset.
        $fieldname = 'validation';
        $mform->addElement('header', $fieldname, get_string($fieldname, 'mod_surveypro'));

        // Item: lowerbound.
        $fieldname = 'lowerbound';
        $elementgroup = [];
        $elementgroup[] = $mform->createElement('select', $fieldname . 'day', '', $days);
        $elementgroup[] = $mform->createElement('select', $fieldname . 'month', '', $months);
        $elementgroup[] = $mform->createElement('select', $fieldname . 'year', '', $years);
        $mform->addGroup($elementgroup, $fieldname . '_group', get_string($fieldname, 'surveyprofield_date'), ' ', false);
        $mform->addHelpButton($fieldname . '_group', $fieldname, 'surveyprofield_date');
        $mform->setDefault($fieldname . 'day', '1');
        $mform->setDefault($fieldname . 'month', '1');
        $mform->setDefault($fieldname . 'year', $startyear);

        // Item: upperbound.
        $fieldname = 'upperbound';
        $elementgroup = [];
        $elementgroup[] = $mform->createElement('select', $fieldname . 'day', '', $days);
        $elementgroup[] = $mform->createElement('select', $fieldname . 'month', '', $months);
        $elementgroup[] = $mform->createElement('select', $fieldname . 'year', '', $years);
        $mform->addGroup($elementgroup, $fieldname . '_group', get_string($fieldname, 'surveyprofield_date'), ' ', false);
        $mform->addHelpButton($fieldname . '_group', $fieldname, 'surveyprofield_date');
        $mform->setDefault($fieldname . 'day', '31');
        $mform->setDefault($fieldname . 'month', '12');
        $mform->setDefault($fieldname . 'year', $stopyear);

        $this->add_item_buttons();
    }

    /**
     * Validation.
     *
     * @param array $data
     * @param array $files
     * @return array $errors
     */
    public function validation($data, $files) {
        // Get _customdata.
        $item = $this->_customdata['item'];

        $errors = parent::validation($data, $files);

        $lowerday = $data['lowerboundday'];
        $lowermonth = $data['lowerboundmonth'];
        $loweryear = $data['lowerboundyear'];
        if (!utility_item::date_is_valid($lowerday, $lowermonth, $loweryear)) {
            $errors['lowerbound_group'] = get_string('ierr_invalidinput', 'mod_surveypro');
            return $errors;
        }
        $upperday = $data['upperboundday'];
        $uppermonth = $data['upperboundmonth'];
        $upperyear = $data['upperboundyear'];
        if (!utility_item::date_is_valid($upperday, $uppermonth, $upperyear)) {
            $errors['upperbound_group'] = get_string('ierr_invalidinput', 'mod_surveypro');
            return $errors;
        }
        $lowerbound = $item->item_date_to_unix_time($loweryear, $lowermonth, $lowerday);
        $upperbound = $item->item_date_to_unix_time($upperyear, $uppermonth, $upperday);

        if ($lowerbound == $upperbound) {
            $errors['lowerbound_group'] = get_string('ierr_lowerequaltoupper', 'surveyprofield_date');
        }
        if ($lowerbound > $upperbound) {
            $errors['lowerbound_group'] = get_string('ierr_lowergreaterthanupper', 'surveyprofield_date');
        }

        // Constrain default between boundaries.
        if ($data['defaultoption'] == SURVEYPRO_CUSTOMDEFAULT) {
            $defaultday = $data['defaultvalueday'];
            $defaultmonth = $data['defaultvaluemonth'];
            $defaultyear = $data['defaultvalueyear'];
            if (!utility_item::date_is_valid($defaultday, $defaultmonth, $defaultyear)) {
                $errors['defaultvalue_group'] = get_string('ierr_invalidinput', 'mod_surveypro');
                return $errors;
            }
            $defaultvalue = $item->item_date_to_unix_time($defaultyear, $defaultmonth, $defaultday);

            if (($defaultvalue < $lowerbound) || ($defaultvalue > $upperbound)) {
                // Internal range.
                $errors['defaultvalue_group'] = get_string('ierr_outofrangedefault', 'surveyprofield_date');
            }
        }

        // Editing teacher can not set "noanswer" as default option if the item is mandatory.
        if (($data['defaultoption'] == SURVEYPRO_NOANSWERDEFAULT) && isset($data['required'])) {
            $a = get_string('noanswer', 'mod_surveypro');
            $errors['defaultoption_group'] = get_string('ierr_notalloweddefault', 'mod_surveypro', $a);
        }

        return $errors;
    }
}
