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<?php
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// This file is part of Moodle - http://moodle.org/
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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 <http://www.gnu.org/licenses/>.
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/**
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* Time splitting method that generates predictions regularly.
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*
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* @package core_analytics
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* @copyright 2019 David Monllao {@link http://www.davidmonllao.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace core_analytics\local\time_splitting;
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defined('MOODLE_INTERNAL') || die();
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/**
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* Time splitting method that generates predictions periodically.
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*
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* @package core_analytics
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* @copyright 2019 David Monllao {@link http://www.davidmonllao.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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abstract class past_periodic extends periodic implements before_now {
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/**
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* Gets the next range with start on the provided time.
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*
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* The next range is based on the past period so we substract this
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* range's periodicity from $time.
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*
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* @param \DateTimeImmutable $time
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* @return array
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*/
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protected function get_next_range(\DateTimeImmutable $time) {
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$end = $time->getTimestamp();
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$start = $time->sub($this->periodicity())->getTimestamp();
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if ($start < $this->analysable->get_start()) {
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// We skip the first range generated as its start is prior to the analysable start.
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return false;
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}
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return [
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'start' => $start,
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'end' => $end,
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'time' => $end
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];
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}
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/**
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* Get the start of the first time range.
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*
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* @return int A timestamp.
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*/
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protected function get_first_start() {
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return $this->analysable->get_start();
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}
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/**
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* Guarantees that the last range dates end right now.
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*
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* @param array $ranges
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* @return array
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*/
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protected function update_last_range(array $ranges) {
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$lastrange = end($ranges);
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if ($lastrange['time'] > time()) {
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// We just need to wait in this case.
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return $lastrange;
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}
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$timetoenddiff = time() - $lastrange['time'];
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$ranges[count($ranges) - 1] = [
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'start' => $lastrange['start'] + $timetoenddiff,
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'end' => $lastrange['end'] + $timetoenddiff,
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'time' => $lastrange['time'] + $timetoenddiff,
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];
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return $ranges;
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}
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}
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