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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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use mod_quiz\local\access_rule_base;
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use mod_quiz\quiz_settings;
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/**
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* A rule imposing the delay between attempts settings.
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*
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* @package quizaccess_delaybetweenattempts
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* @copyright 2009 Tim Hunt
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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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class quizaccess_delaybetweenattempts extends access_rule_base {
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public static function make(quiz_settings $quizobj, $timenow, $canignoretimelimits) {
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if (empty($quizobj->get_quiz()->delay1) && empty($quizobj->get_quiz()->delay2)) {
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return null;
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}
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return new self($quizobj, $timenow);
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}
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public function prevent_new_attempt($numprevattempts, $lastattempt) {
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if ($this->quiz->attempts > 0 && $numprevattempts >= $this->quiz->attempts) {
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// No more attempts allowed anyway.
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return false;
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}
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if ($this->quiz->timeclose != 0 && $this->timenow > $this->quiz->timeclose) {
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// No more attempts allowed anyway.
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return false;
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}
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$nextstarttime = $this->compute_next_start_time($numprevattempts, $lastattempt);
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if ($this->timenow < $nextstarttime) {
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if ($this->quiz->timeclose == 0 || $nextstarttime <= $this->quiz->timeclose) {
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return get_string('youmustwait', 'quizaccess_delaybetweenattempts',
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userdate($nextstarttime));
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} else {
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return get_string('youcannotwait', 'quizaccess_delaybetweenattempts');
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}
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}
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return false;
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}
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/**
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* Compute the next time a student would be allowed to start an attempt,
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* according to this rule.
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* @param int $numprevattempts number of previous attempts.
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* @param stdClass $lastattempt information about the previous attempt.
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* @return number the time.
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*/
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protected function compute_next_start_time($numprevattempts, $lastattempt) {
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if ($numprevattempts == 0) {
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return 0;
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}
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$lastattemptfinish = $lastattempt->timefinish;
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if ($this->quiz->timelimit > 0) {
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$lastattemptfinish = min($lastattemptfinish,
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$lastattempt->timestart + $this->quiz->timelimit);
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}
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if ($numprevattempts == 1 && $this->quiz->delay1) {
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return $lastattemptfinish + $this->quiz->delay1;
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} else if ($numprevattempts > 1 && $this->quiz->delay2) {
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return $lastattemptfinish + $this->quiz->delay2;
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}
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return 0;
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}
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public function is_finished($numprevattempts, $lastattempt) {
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$nextstarttime = $this->compute_next_start_time($numprevattempts, $lastattempt);
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return $this->timenow <= $nextstarttime &&
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$this->quiz->timeclose != 0 && $nextstarttime >= $this->quiz->timeclose;
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}
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}
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