moodle-mod-customcert/element/daterange/classes/element.php

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<?php
// This file is part of the customcert module for 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/>.
/**
* This file contains the customcert date range element.
*
* @package customcertelement_daterange
* @copyright 2018 Dmitrii Metelkin <dmitriim@catalyst-au.net>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace customcertelement_daterange;
use \mod_customcert\element_helper;
defined('MOODLE_INTERNAL') || die('Direct access to this script is forbidden.');
require_once($CFG->dirroot . '/lib/grade/constants.php');
/**
* The customcert date range element.
*
* @package customcertelement_daterange
* @copyright 2018 Dmitrii Metelkin <dmitriim@catalyst-au.net>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class element extends \mod_customcert\element {
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/**
* Max recurring period in seconds.
*/
const MAX_RECURRING_PERIOD = 31556926; // 12 months.
/**
* Current year placeholder string.
*/
const CURRENT_YEAR_PLACEHOLDER = '{{current_year}}';
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/**
* First year in a date range placeholder string.
*/
const RANGE_FIRST_YEAR_PLACEHOLDER = '{{range_first_year}}';
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/**
* Last year in a date range placeholder string.
*/
const RANGE_LAST_YEAR_PLACEHOLDER = '{{range_last_year}}';
/**
* First year in a date range placeholder string.
*/
const RECUR_RANGE_FIRST_YEAR_PLACEHOLDER = '{{recurring_range_first_year}}';
/**
* Last year in a date range placeholder string.
*/
const RECUR_RANGE_LAST_YEAR_PLACEHOLDER = '{{recurring_range_last_year}}';
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/**
* A year in the user's date.
*/
const DATE_YEAR_PLACEHOLDER = '{{date_year}}';
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/**
* Date - Issue
*/
const DATE_ISSUE = 1;
/**
* Date - Completion
*/
const DATE_COMPLETION = 2;
/**
* Date - Course start
*/
const DATE_COURSE_START = 3;
/**
* Date - Course end
*/
const DATE_COURSE_END = 4;
/**
* Date - Course grade date
*/
const DATE_COURSE_GRADE = 5;
/**
* This function renders the form elements when adding a customcert element.
*
* @param \mod_customcert\edit_element_form $mform the edit_form instance
*/
public function render_form_elements($mform) {
global $COURSE;
// Get the possible date options.
$dateoptions = array();
$dateoptions[self::DATE_ISSUE] = get_string('issueddate', 'customcertelement_daterange');
$dateoptions[self::DATE_COMPLETION] = get_string('completiondate', 'customcertelement_daterange');
$dateoptions[self::DATE_COURSE_START] = get_string('coursestartdate', 'customcertelement_daterange');
$dateoptions[self::DATE_COURSE_END] = get_string('courseenddate', 'customcertelement_daterange');
$dateoptions[self::DATE_COURSE_GRADE] = get_string('coursegradedate', 'customcertelement_daterange');
$dateoptions = $dateoptions + element_helper::get_grade_items($COURSE);
$mform->addElement('select', 'dateitem', get_string('dateitem', 'customcertelement_daterange'), $dateoptions);
$mform->addHelpButton('dateitem', 'dateitem', 'customcertelement_daterange');
parent::render_form_elements($mform);
$mform->addElement('header', 'dateranges', get_string('dateranges', 'customcertelement_daterange'));
$mform->addElement('static', 'help', '', get_string('help', 'customcertelement_daterange'));
$mform->addElement('static', 'placeholders', '', get_string('placeholders', 'customcertelement_daterange'));
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$mform->addElement('text', 'fallbackstring', get_string('fallbackstring', 'customcertelement_daterange'));
$mform->addHelpButton('fallbackstring', 'fallbackstring', 'customcertelement_daterange');
$mform->setType('fallbackstring', PARAM_NOTAGS);
if (empty($this->get_decoded_data()->dateranges)) {
$repeats = 1;
} else {
$repeats = count($this->get_decoded_data()->dateranges);
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}
$ranges = [];
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$ranges[] = $mform->createElement('html', '<hr>');
$ranges[] = $mform->createElement(
'date_selector',
'startdate',
get_string('start', 'customcertelement_daterange')
);
$ranges[] = $mform->createElement(
'date_selector',
'enddate',
get_string('end', 'customcertelement_daterange')
);
$ranges[] = $mform->createElement(
'checkbox',
'recurring',
get_string('recurring', 'customcertelement_daterange')
);
$ranges[] = $mform->createElement(
'text',
'datestring',
get_string('datestring', 'customcertelement_daterange'),
['class' => 'datestring']
);
$ranges[] = $mform->createElement(
'advcheckbox',
'rangedelete',
get_string('setdeleted', 'customcertelement_daterange'),
'',
[],
[0, 1]
);
$rangeoptions = array();
$rangeoptions['startdate']['type'] = PARAM_INT;
$rangeoptions['enddate']['type'] = PARAM_INT;
$rangeoptions['recurring']['type'] = PARAM_INT;
$rangeoptions['datestring']['type'] = PARAM_NOTAGS;
$rangeoptions['rangedelete']['type'] = PARAM_BOOL;
$addstring = get_string('addrange', 'customcertelement_daterange');
$this->get_edit_element_form()->repeat_elements($ranges, $repeats, $rangeoptions, 'repeats', 'add', 1, $addstring, true);
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}
/**
* A helper function to build consistent form element name.
*
* @param string $name
* @param string $num
*
* @return string
*/
protected function build_element_name($name, $num) {
return $name . '[' . $num . ']';
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}
/**
* Get decoded data stored in DB.
*
* @return \stdClass
*/
protected function get_decoded_data() {
return json_decode($this->get_data());
}
/**
* Sets the data on the form when editing an element.
*
* @param \mod_customcert\edit_element_form $mform the edit_form instance
*/
public function definition_after_data($mform) {
if (!empty($this->get_data()) && !$mform->isSubmitted()) {
$element = $mform->getElement('dateitem');
$element->setValue($this->get_decoded_data()->dateitem);
$element = $mform->getElement('fallbackstring');
$element->setValue($this->get_decoded_data()->fallbackstring);
foreach ($this->get_decoded_data()->dateranges as $key => $range) {
$mform->setDefault($this->build_element_name('startdate', $key), $range->startdate);
$mform->setDefault($this->build_element_name('enddate', $key), $range->enddate);
$mform->setDefault($this->build_element_name('datestring', $key), $range->datestring);
$mform->setDefault($this->build_element_name('recurring', $key), $range->recurring);
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}
}
parent::definition_after_data($mform);
}
/**
* Performs validation on the element values.
*
* @param array $data the submitted data
* @param array $files the submitted files
* @return array the validation errors
*/
public function validate_form_elements($data, $files) {
$errors = parent::validate_form_elements($data, $files);
// Check if at least one range is set.
$error = get_string('error:atleastone', 'customcertelement_daterange');
for ($i = 0; $i < $data['repeats']; $i++) {
if (empty($data['rangedelete'][$i])) {
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$error = '';
}
}
if (!empty($error)) {
$errors['help'] = $error;
}
// Check that datestring is set dataranges what aren't need to be deleted.
for ($i = 0; $i < $data['repeats']; $i++) {
// Skip elements that needs to be deleted.
if (!empty($data['rangedelete'][$i])) {
continue;
}
if (empty($data['datestring'][$i])) {
$name = $this->build_element_name('datestring', $i);
$errors[$name] = get_string('error:datestring', 'customcertelement_daterange');
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}
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// Check that end date is correctly set.
if ( $data['startdate'][$i] >= $data['enddate'][$i] ) {
$errors[$this->build_element_name('enddate', $i)] = get_string('error:enddate', 'customcertelement_daterange');
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}
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$rangeperiod = $data['enddate'][$i] - $data['startdate'][$i];
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// Check that recurring dateranges are not longer than 12 months.
if (!empty($data['recurring'][$i]) && $rangeperiod >= self::MAX_RECURRING_PERIOD ) {
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$errors[$this->build_element_name('enddate', $i)] = get_string('error:recurring', 'customcertelement_daterange');
}
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}
return $errors;
}
/**
* This will handle how form data will be saved into the data column in the
* customcert_elements table.
*
* @param \stdClass $data the form data
* @return string the json encoded array
*/
public function save_unique_data($data) {
$arrtostore = array(
'dateitem' => $data->dateitem,
'fallbackstring' => $data->fallbackstring,
'dateranges' => [],
);
for ($i = 0; $i < $data->repeats; $i++) {
if (empty($data->rangedelete[$i])) {
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$arrtostore['dateranges'][] = [
'startdate' => $data->startdate[$i],
'enddate' => $data->enddate[$i],
'datestring' => $data->datestring[$i],
'recurring' => !empty($data->recurring[$i]),
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];
}
}
// Encode these variables before saving into the DB.
return json_encode($arrtostore);
}
/**
* Handles rendering the element on the pdf.
*
* @param \pdf $pdf the pdf object
* @param bool $preview true if it is a preview, false otherwise
* @param \stdClass $user the user we are rendering this for
*/
public function render($pdf, $preview, $user) {
global $DB;
// If there is no element data, we have nothing to display.
if (empty($this->get_data())) {
return;
}
$courseid = element_helper::get_courseid($this->id);
$dateitem = $this->get_decoded_data()->dateitem;
// If we are previewing this certificate then just show a demonstration date.
if ($preview) {
$date = time();
} else {
// Get the page.
$page = $DB->get_record('customcert_pages', array('id' => $this->get_pageid()), '*', MUST_EXIST);
// Get the customcert this page belongs to.
$customcert = $DB->get_record('customcert', array('templateid' => $page->templateid), '*', MUST_EXIST);
// Now we can get the issue for this user.
$issue = $DB->get_record('customcert_issues', array('userid' => $user->id, 'customcertid' => $customcert->id),
'*', MUST_EXIST);
switch ($dateitem) {
case self::DATE_ISSUE:
$date = $issue->timecreated;
break;
case self::DATE_COMPLETION:
// Get the last completion date.
$sql = "SELECT MAX(c.timecompleted) as timecompleted
FROM {course_completions} c
WHERE c.userid = :userid
AND c.course = :courseid";
if ($timecompleted = $DB->get_record_sql($sql, array('userid' => $issue->userid, 'courseid' => $courseid))) {
if (!empty($timecompleted->timecompleted)) {
$date = $timecompleted->timecompleted;
}
}
break;
case self::DATE_COURSE_START:
$date = $DB->get_field('course', 'startdate', array('id' => $courseid));
break;
case self::DATE_COURSE_END:
$date = $DB->get_field('course', 'enddate', array('id' => $courseid));
break;
case self::DATE_COURSE_GRADE:
$grade = element_helper::get_course_grade_info(
$courseid,
GRADE_DISPLAY_TYPE_DEFAULT, $user->id
);
if ($grade && !empty($grade->get_dategraded())) {
$date = $grade->get_dategraded();
}
break;
default:
if (strpos($dateitem, 'gradeitem:') === 0) {
$gradeitemid = substr($dateitem, 10);
$grade = element_helper::get_grade_item_info(
$gradeitemid,
$dateitem,
$user->id
);
} else {
$grade = element_helper::get_mod_grade_info(
$dateitem,
GRADE_DISPLAY_TYPE_DEFAULT,
$user->id
);
}
if ($grade && !empty($grade->get_dategraded())) {
$date = $grade->get_dategraded();
}
break;
}
}
// Ensure that a date has been set.
if (!empty($date)) {
element_helper::render_content($pdf, $this, $this->get_daterange_string($date));
}
}
/**
* Get daterange string.
*
* @param int $date Unix stamp date.
*
* @return string
*/
protected function get_daterange_string($date) {
$matchedrange = null;
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$outputstring = '';
$formatdata = [];
$formatdata['date'] = $date;
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foreach ($this->get_decoded_data()->dateranges as $key => $range) {
if ($this->is_recurring_range($range)) {
if ($matchedrange = $this->get_matched_recurring_range($date, $range)) {
$outputstring = $matchedrange->datestring;
$formatdata['range'] = $range;
$formatdata['recurringrange'] = $matchedrange;
break;
}
} else {
if ($this->is_date_in_range($date, $range)) {
$outputstring = $range->datestring;
$formatdata['range'] = $range;
break;
}
}
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}
if (empty($outputstring) && !empty($this->get_decoded_data()->fallbackstring)) {
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$outputstring = $this->get_decoded_data()->fallbackstring;
}
return $this->format_date_string($outputstring, $formatdata);
}
/**
* @param \stdClass $range Range object.
*
* @return bool
*/
protected function is_recurring_range(\stdClass $range) {
return !empty($range->recurring);
}
/**
* Check if the provided date is in the date range.
*
* @param int $date Unix timestamp date to check.
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* @param \stdClass $range Range object.
*
* @return bool
*/
protected function is_date_in_range($date, \stdClass $range) {
return ($date >= $range->startdate && $date <= $range->enddate);
}
/**
* Check if provided date is in the recurring date range.
*
* @param int $date Unix timestamp date to check.
* @param \stdClass $range Range object.
*
* @return bool
*/
protected function is_date_in_recurring_range($date, \stdClass $range) {
$intdate = $this->build_number_from_date($date);
$intstart = $this->build_number_from_date($range->startdate);
$intend = $this->build_number_from_date($range->enddate);
if (!$this->has_turn_of_the_year($range)) {
if ($intdate >= $intstart && $intdate <= $intend) {
return true;
}
} else {
if ($intdate >= $intstart && $intdate >= $intend) {
return true;
}
if ($intdate <= $intstart && $intdate <= $intend) {
return true;
}
}
return false;
}
/**
* Check if provided recurring range has a turn of the year.
*
* @param \stdClass $reccurringrange Range object.
*
* @return bool
*/
protected function has_turn_of_the_year(\stdClass $reccurringrange) {
return date('Y', $reccurringrange->startdate) != date('Y', $reccurringrange->enddate);
}
/**
* Check if provided date is in the start year of the recurring range with a turn of the year.
*
* @param int $date Unix timestamp date to check.
* @param \stdClass $range Range object.
*
* @return bool
*/
protected function in_start_year($date, \stdClass $range) {
$intdate = $this->build_number_from_date($date);
$intstart = $this->build_number_from_date($range->startdate);
$intend = $this->build_number_from_date($range->enddate);
return $intdate >= $intstart && $intdate >= $intend;
}
/**
* Check if provided date is in the end year of the recurring range with a turn of the year.
*
* @param int $date Unix timestamp date to check.
* @param \stdClass $range Range object.
*
* @return bool
*/
protected function in_end_year($date, \stdClass $range) {
$intdate = $this->build_number_from_date($date);
$intstart = $this->build_number_from_date($range->startdate);
$intend = $this->build_number_from_date($range->enddate);
return $intdate <= $intstart && $intdate <= $intend;
}
/**
* Return matched recurring date range.
*
* As recurring date ranges do not depend on the year,
* we will use a date's year to build a new matched recurring date range with
* start year and end year. This is required to replace placeholders like range_first_year and range_last_year.
*
* @param int $date Unix timestamp date to check.
* @param \stdClass $range Range object.
*
* @return \stdClass || null
*/
protected function get_matched_recurring_range($date, \stdClass $range) {
if (!$this->is_date_in_recurring_range($date, $range)) {
return null;
}
$matchedrage = clone $range;
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if ($this->has_turn_of_the_year($matchedrage)) {
if ($this->in_start_year($date, $matchedrage)) {
$startyear = date('Y', $date);
$endyear = $startyear + 1;
$matchedrage->startdate = strtotime(date('d.m.', $matchedrage->startdate) . $startyear);
$matchedrage->enddate = strtotime(date('d.m.', $matchedrage->enddate) . $endyear);
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return $matchedrage;
}
if ($this->in_end_year($date, $matchedrage)) {
$endyear = date('Y', $date);
$startyear = $endyear - 1;
$matchedrage->startdate = strtotime(date('d.m.', $matchedrage->startdate) . $startyear);
$matchedrage->enddate = strtotime(date('d.m.', $matchedrage->enddate) . $endyear);
return $matchedrage;
}
} else {
$matchedrage->startdate = strtotime(date('d.m.', $matchedrage->startdate) . date('Y', $date));
$matchedrage->enddate = strtotime(date('d.m.', $matchedrage->enddate) . date('Y', $date));
return $matchedrage;
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}
return null;
}
/**
* Build number representation of the provided date.
*
* @param int $date Unix timestamp date to check.
*
* @return int
*/
protected function build_number_from_date($date) {
return (int)date('md', $date);
}
/**
* Format date string based on different types of placeholders.
*
* @param array $formatdata A list of format data.
*
* @return string
*/
protected function format_date_string($datestring, array $formatdata) {
foreach ($this->get_placeholders() as $search => $replace) {
$datestring = str_replace($search, $replace, $datestring);
}
if (!empty($formatdata['date'])) {
foreach ($this->get_date_placeholders($formatdata['date']) as $search => $replace) {
$datestring = str_replace($search, $replace, $datestring);
}
}
if (!empty($formatdata['range'])) {
foreach ($this->get_range_placeholders($formatdata['range']) as $search => $replace) {
$datestring = str_replace($search, $replace, $datestring);
}
}
if (!empty($formatdata['recurringrange'])) {
foreach ($this->get_recurring_range_placeholders($formatdata['recurringrange']) as $search => $replace) {
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$datestring = str_replace($search, $replace, $datestring);
}
}
return $datestring;
}
/**
* Return a list of placeholders to replace in date string as search => $replace pairs.
*
* @return array
*/
protected function get_placeholders() {
return [
self::CURRENT_YEAR_PLACEHOLDER => date('Y', time()),
];
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}
/**
* Return a list of user's date related placeholders to replace in date string as search => $replace pairs.
* @param int $date Unix timestamp date to check.
*
* @return array
*/
protected function get_date_placeholders($date) {
return [
self::DATE_YEAR_PLACEHOLDER => date('Y', $date),
];
}
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/**
* Return a list of range related placeholders to replace in date string as search => $replace pairs.
*
* @param \stdClass $range
*
* @return array
*/
protected function get_range_placeholders(\stdClass $range) {
return [
self::RANGE_FIRST_YEAR_PLACEHOLDER => date('Y', $range->startdate),
self::RANGE_LAST_YEAR_PLACEHOLDER => date('Y', $range->enddate),
];
}
/**
* Return a list of recurring range s placeholders to replace in date string as search => $replace pairs.
*
* @param \stdClass $range
*
* @return array
*/
protected function get_recurring_range_placeholders(\stdClass $range) {
return [
self::RECUR_RANGE_FIRST_YEAR_PLACEHOLDER => date('Y', $range->startdate),
self::RECUR_RANGE_LAST_YEAR_PLACEHOLDER => date('Y', $range->enddate),
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];
}
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/**
* Render the element in html.
*
* This function is used to render the element when we are using the
* drag and drop interface to position it.
*
* @return string the html
*/
public function render_html() {
// If there is no element data, we have nothing to display.
if (empty($this->get_data())) {
return;
}
return element_helper::render_html_content($this, get_string('preview', 'customcertelement_daterange', $this->get_name()));
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}
/**
* This function is responsible for handling the restoration process of the element.
*
* We will want to update the course module the date element is pointing to as it will
* have changed in the course restore.
*
* @param \restore_customcert_activity_task $restore
*/
public function after_restore($restore) {
global $DB;
$data = $this->get_decoded_data();
if ($newitem = \restore_dbops::get_backup_ids_record($restore->get_restoreid(), 'course_module', $data->dateitem)) {
$data->dateitem = $newitem->newitemid;
$DB->set_field('customcert_elements', 'data', $this->save_unique_data($data), array('id' => $this->get_id()));
}
}
}