368 lines
13 KiB
PHP
368 lines
13 KiB
PHP
<?php
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// This file is part of the Studyplan plugin for Moodle
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <https://www.gnu.org/licenses/>.
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/**
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* Model class for period descriptions
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* @package local_treestudyplan
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* @copyright 2023 P.M. Kuipers
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* @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace local_treestudyplan;
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use DateInterval;
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defined('MOODLE_INTERNAL') || die();
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require_once($CFG->libdir.'/externallib.php');
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/**
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* Model class for period descriptions
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*/
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class period {
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/** @var string */
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const TABLE = "local_treestudyplan_period";
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/**
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* Cache all retrieved periods in this session
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* @var array */
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private static $cache = [];
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/**
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* Cache the collection of periods per page retrieved this session
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* @var array */
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private static $pagecache = [];
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/**
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* Holds database record
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* @var stdClass
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*/
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private $r;
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/** @var int */
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private $id;
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/** @var studyplanpage */
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private $page;
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/**
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* Shortcut to studyplan (page)'s aggregator
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*/
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public function aggregator() : aggregator {
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return $this->page->aggregator();
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}
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/**
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* Find record in database and return management object
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* *Caches to avoid multiple creation events in one session.
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* @param int $id Id of database record
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*/
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public static function find_by_id($id): self {
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if (!array_key_exists($id, self::$cache)) {
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self::$cache[$id] = new self($id);
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}
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return self::$cache[$id];
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}
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/**
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* Find a period by page and period number [1..$page->periods()]
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* @param studyplanpage $page Studyplan page to find period for
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* @param int $periodnr Period sequence nr [1..$page->periods()]
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*/
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public static function find(studyplanpage $page, $periodnr): self {
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global $DB;
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if ($periodnr < 1) {
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// Clamp period index .
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$periodnr = 1;
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}
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try {
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$id = $DB->get_field(self::TABLE, "id", ["page_id" => $page->id(), "period" => $periodnr], MUST_EXIST);
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$period = self::find_by_id($id);
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} catch (\dml_missing_record_exception $x) {
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// Period does not exist - create one ...
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// Make a best guess estimate of the start and end date, based on surrounding periods,.
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// Or specified duration of the page and the sequence of the periods .
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$pcount = $page->periods();
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$ystart = $page->startdate()->getTimestamp();
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$yend = $page->enddate()->getTimestamp();
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// Estimate the period's timing to make a reasonable first guess.
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$ydelta = $yend - $ystart;
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$ptime = $ydelta / $pcount;
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try {
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// Check if we have a previous period to glance the end date of as a reference.
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$startdate = $DB->get_field(self::TABLE, "enddate",
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["page_id" => $page->id(), "period" => $periodnr - 1], MUST_EXIST);
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$pstart = strtotime($startdate) + (24 * 60 * 60); // Add one day.
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} catch (\dml_missing_record_exception $x2) {
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// If not, do a fair guess.
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$pstart = $ystart + (($periodnr - 1) * $ptime);
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}
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try {
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// Check if we have a next period to glance the start date of as a reference.
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$enddate = $DB->get_field(self::TABLE, "startdate",
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["page_id" => $page->id(), "period" => $periodnr + 1], MUST_EXIST);
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$pstart = strtotime($enddate) - (24 * 60 * 60); // Subtract one day.
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} catch (\dml_missing_record_exception $x) {
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// If not, do a fair guess.
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$pend = $pstart + $ptime;
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}
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// And create the period.
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$period = self::add([
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'page_id' => $page->id(),
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'period' => $periodnr,
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'fullname' => \get_string("period_default_fullname", "local_treestudyplan", $periodnr),
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'shortname' => \get_string("period_default_shortname", "local_treestudyplan", $periodnr),
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'startdate' => date("Y-m-d", $pstart),
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'enddate' => date("Y-m-d", $pend),
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]);
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}
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return $period;
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}
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/**
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* Find all periods registered to a studyplan in sequence
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* @param studyplanpage $page Studyplan page to find periods for
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* @return period[]
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*/
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public static function find_for_page(studyplanpage $page): array {
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if (!array_key_exists($page->id(), self::$pagecache)) {
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$periods = [];
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// Find and add the periods to an array with the period sequence as a key.
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for ($i = 1; $i <= $page->periods(); $i++) {
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$period = self::find($page, $i);
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$periods[$i] = $period;
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}
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self::$pagecache[$page->id()] = $periods;
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}
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return self::$pagecache[$page->id()];
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}
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/**
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* Construct new instance from DB record
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* @param int $id Id of database record
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*/
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private function __construct($id) {
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global $DB;
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$this->id = $id;
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$this->r = $DB->get_record(self::TABLE, ['id' => $id]);
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$this->page = studyplanpage::find_by_id($this->r->page_id);
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}
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/**
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* Return database identifier
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* @return int
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*/
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public function id() {
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return $this->id;
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}
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/**
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* Return associated studyplan
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* @return studyplan
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*/
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public function studyplan() : studyplan {
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return $this->page->studyplan();
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}
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/**
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* Return associated studyplan page
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* @return studyplanpage
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*/
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public function page() {
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return $this->page;
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}
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/**
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* Return short name
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* @return string
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*/
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public function shortname() {
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return $this->r->shortname;
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}
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/**
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* Return full name
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* @return string
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*/
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public function fullname() {
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return $this->r->fullname;
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}
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/**
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* Return period sequence number
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* @return int
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*/
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public function period() {
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return $this->r->period;
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}
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/**
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* Start date
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* @return \DateTime
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*/
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public function startdate() {
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return new \DateTime($this->r->startdate);
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}
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/**
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* End date
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* @return \DateTime
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*/
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public function enddate() {
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if ($this->r->enddate && strlen($this->r->enddate) > 0) {
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return new \DateTime($this->r->enddate);
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} else {
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// Return a date 2 months into the future if not set.... Yes, it needs to be set.
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return (new \DateTime($this->r->startdate))->add(new \DateInterval("P2M"));
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}
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}
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/**
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* Webservice structure for basic info
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* @param int $value Webservice requirement constant
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*/
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public static function structure($value = VALUE_REQUIRED) : \external_description {
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return new \external_single_structure([
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"id" => new \external_value(PARAM_INT, 'id of period'),
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"fullname" => new \external_value(PARAM_TEXT, 'Full name of period'),
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"shortname" => new \external_value(PARAM_TEXT, 'Short name of period'),
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"period" => new \external_value(PARAM_INT, 'period sequence'),
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"startdate" => new \external_value(PARAM_TEXT, 'start date of period'),
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"enddate" => new \external_value(PARAM_TEXT, 'end date of period'),
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], 'Period info', $value);
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}
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/**
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* Webservice model for basic info
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* @return array Webservice data model
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*/
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public function model() {
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return [
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'id' => $this->r->id,
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'fullname' => $this->r->fullname,
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'shortname' => $this->r->shortname,
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'period' => $this->r->period,
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'startdate' => $this->r->startdate,
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'enddate' => $this->r->enddate,
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];
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}
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/**
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* Add a new period for a studyplan page
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* Use only when performing import! The static find() and find_for_page() functions create the period during normal operation
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* @param array $fields Properties for ['page_id', 'fullname', 'shortname', 'period', 'startdate', 'enddate']
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*/
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public static function add($fields) : self {
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global $DB;
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if (!isset($fields['page_id'])) {
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throw new \InvalidArgumentException("parameter 'page_id' missing");
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}
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if (!isset($fields['period'])) {
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throw new \InvalidArgumentException("parameter 'period' missing");
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}
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if ($DB->record_exists(self::TABLE, ["page_id" => $fields["page_id"], "period" => $fields["period"]])) {
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throw new \InvalidArgumentException("record already exists for specified page and period");
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}
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$addable = ['page_id', 'fullname', 'shortname', 'period', 'startdate', 'enddate'];
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$info = [ ];
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foreach ($addable as $f) {
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if (array_key_exists($f, $fields)) {
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$info[$f] = $fields[$f];
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}
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}
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$id = $DB->insert_record(self::TABLE, $info);
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unset(self::$pagecache[$fields['page_id']]); // Invalidate the cache for this page.
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return self::find_by_id($id); // Make sure the new page is immediately cached.
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}
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/**
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* Edit period properties
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* @param array $fields Properties for ['fullname', 'shortname', 'startdate', 'enddate']
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*/
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public function edit($fields) : self {
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global $DB;
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$pages = self::find_for_page($this->page());
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$prev = (count($pages) > 2 && $this->period() >= 1) ? $pages[$this->period() - 1] : null;
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$next = (count($pages) > $this->period()) ? $pages[$this->period() + 1] : null;
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$editable = ['fullname', 'shortname', 'startdate', 'enddate'];
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$info = ['id' => $this->id, ];
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foreach ($editable as $f) {
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if (array_key_exists($f, $fields)) {
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$info[$f] = $fields[$f];
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}
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}
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$DB->update_record(self::TABLE, $info);
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// Reload record after edit and ensure end dates of previous period are adjusted if needed.
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$this->r = $DB->get_record(self::TABLE, ['id' => $this->id], "*", MUST_EXIST);
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// Adjust end date of previous period if needed
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if (isset($prev) && !empty($fields['startdate'])) {
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$maxdate = $this->startdate()->sub(new DateInterval("P1D")); // Subtract 1 day, since periods include the end day.
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$rqdate = $prev->enddate();
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if ($maxdate < $rqdate) {
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$prev->edit(["enddate" => $maxdate->format("Y-m-d")]);
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}
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}
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// Adjust start date of next period if needed
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if (isset($next) && !empty($fields['enddate'])) {
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$mindate = $this->enddate()->add(new DateInterval("P1D")); // Subtract 1 day, since periods include the end day.
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$rqdate = $next->startdate();
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if ($mindate > $rqdate) {
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$next->edit(["startdate" => $mindate->format("Y-m-d")]);
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}
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}
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unset(self::$pagecache[$this->r->page_id]); // Invalidate the cache for this page.
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return $this;
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}
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/**
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* Delete period
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*/
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public function delete() : success {
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global $DB;
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$DB->delete_records(self::TABLE, ['id' => $this->id]);
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unset(self::$pagecache[$this->r->page_id]); // Invalidate the cache for this page.
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return success::success();
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}
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/**
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* Webservice structure for list of periods in page
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* @param int $value Webservice requirement constant
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*/
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public static function page_structure($value = VALUE_REQUIRED) : \external_description {
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return new \external_multiple_structure(self::structure(), "The periods in the page", $value);
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}
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/**
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* Webservice model list of periods in page
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* @param studyplanpage $page The page to create the model for
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* @return array Webservice data model
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*/
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public static function page_model(studyplanpage $page) : array {
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$model = [];
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foreach (self::find_for_page($page) as $p) {
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$model[] = $p->model();
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}
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return $model;
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}
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}
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