<?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/>.

/**

* Fault-tolerant quiz mode, replacement attempt.php page.

*

* @package quizaccess_offlinemode

* @copyright 2014 The Open University

* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

*/

require_once(__DIR__ . '/../../../../config.php');

require_once($CFG->dirroot . '/mod/quiz/locallib.php');

// Get submitted parameters.

$attemptid = required_param('attempt', PARAM_INT);

$page = optional_param('page', null, PARAM_INT);

// Create the attempt object.

$attemptobj = quiz_attempt::create($attemptid);

// Fix the page number if necessary.

if ($page === null) {

$page = $attemptobj->get_attempt()->currentpage;

}

if ($attemptobj->get_navigation_method() == QUIZ_NAVMETHOD_SEQ && $page < $attemptobj->get_currentpage()) {

$page = $attemptobj->get_currentpage();

}

// Initialise $PAGE.

$pageurl = $attemptobj->attempt_url(null, $page);

$PAGE->set_url(quizaccess_offlinemode::ATTEMPT_URL, $pageurl->params());

// Check login.

require_login($attemptobj->get_course(), false, $attemptobj->get_cm());

// Check that this attempt belongs to this user.

if ($attemptobj->get_userid() != $USER->id) {

if ($attemptobj->has_capability('mod/quiz:viewreports')) {

redirect($attemptobj->review_url(null, $page));

} else {

throw new moodle_quiz_exception($attemptobj->get_quizobj(), 'notyourattempt');

}

}

// Check capabilities and block settings.

if (!$attemptobj->is_preview_user()) {

$attemptobj->require_capability('mod/quiz:attempt');

if (empty($attemptobj->get_quiz()->showblocks)) {

$PAGE->blocks->show_only_fake_blocks();

}

} else {

navigation_node::override_active_url($attemptobj->start_attempt_url());

}

// If the attempt is already closed, send them to the review page.

if ($attemptobj->is_finished()) {

redirect($attemptobj->review_url(null, $page));

} else if ($attemptobj->get_state() == quiz_attempt::OVERDUE) {

redirect($attemptobj->summary_url());

}

// Check the access rules.

$accessmanager = $attemptobj->get_access_manager(time());

$accessmanager->setup_attempt_page($PAGE);

// Complete masquerading as the mod-quiz-attempt page. Must be done after setup_attempt_page.

$PAGE->set_pagetype('mod-quiz-attempt');

// Get the renderer.

$output = $PAGE->get_renderer('mod_quiz');

$messages = $accessmanager->prevent_access();

if (!$attemptobj->is_preview_user() && $messages) {

print_error('attempterror', 'quiz', $attemptobj->view_url(),

$output->access_messages($messages));

}

if ($accessmanager->is_preflight_check_required($attemptobj->get_attemptid())) {

redirect($attemptobj->start_attempt_url(null, $page));

}

// Initialise the JavaScript.

question_engine::initialise_js();

$PAGE->requires->js_module(quiz_get_js_module());

$autosaveperiod = get_config('quiz', 'autosaveperiod');

if (!$autosaveperiod) {

// Offline mode only works with autosave, so if it is off for normal quizzes,

// use a sensible default.

$autosaveperiod = 60;

}

$PAGE->requires->yui_module('moodle-quizaccess_offlinemode-autosave',

'M.quizaccess_offlinemode.autosave.init', array($autosaveperiod));

$PAGE->requires->yui_module('moodle-quizaccess_offlinemode-navigation',

'M.quizaccess_offlinemode.navigation.init', array($page));

if (!empty($USER->idnumber)) {

$user = '-i' . $USER->idnumber;

} else {

$user = '-u' . $USER->id;

}

$emergencysavefilename = clean_filename(format_string($attemptobj->get_quiz_name()) .

$user . '-a' . $attemptid . '-d197001010000.attemptdata');

$PAGE->requires->yui_module('moodle-quizaccess_offlinemode-download',

'M.quizaccess_offlinemode.download.init',

array($emergencysavefilename, get_config('quizaccess_offlinemode', 'publickey')));

$PAGE->requires->strings_for_js(array('answerchanged', 'savetheresponses', 'submitting',

'submitfailed', 'submitfailedmessage', 'submitfaileddownloadmessage',

'lastsaved', 'lastsavedtotheserver', 'lastsavedtothiscomputer',

'savingdots', 'savingtryagaindots', 'savefailed', 'logindialogueheader',

'changesmadereallygoaway'), 'quizaccess_offlinemode');

$PAGE->requires->strings_for_js(array('submitallandfinish', 'confirmclose'), 'quiz');

$PAGE->requires->string_for_js('flagged', 'question');

$PAGE->requires->string_for_js('confirmation', 'admin');

// Log this page view.

$params = array(

'objectid' => $attemptid,

'relateduserid' => $attemptobj->get_userid(),

'courseid' => $attemptobj->get_courseid(),

'context' => context_module::instance($attemptobj->get_cmid()),

'other' => array(

'quizid' => $attemptobj->get_quizid()

)

);

$event = \mod_quiz\event\attempt_viewed::create($params);

$event->add_record_snapshot('quiz_attempts', $attemptobj->get_attempt());

$event->trigger();

// Arrange for the navigation to be displayed in the first region on the page.

$navbc = $attemptobj->get_navigation_panel($output, 'quiz_attempt_nav_panel', -1);

$regions = $PAGE->blocks->get_regions();

$PAGE->blocks->add_fake_block($navbc, reset($regions));

// Initialise $PAGE some more.

$title = get_string('attempt', 'quiz', $attemptobj->get_attempt_number());

$PAGE->set_title($attemptobj->get_quiz_name());

$PAGE->set_heading($attemptobj->get_course()->fullname);

// A few final things.

if ($attemptobj->is_last_page($page)) {

$nextpage = -1;

} else {

$nextpage = $page + 1;

}

// Display the page.

// From mod_quiz_renderer::attempt_form.

$form = '';

// Start the form.

$form .= html_writer::start_tag('form',

array('action' => $attemptobj->processattempt_url(), 'method' => 'post',

'enctype' => 'multipart/form-data', 'accept-charset' => 'utf-8',

'id' => 'responseform'));

$form .= html_writer::start_tag('div');

// Print all the questions on every page.

$numpages = $attemptobj->get_num_pages();

for ($i = 0; $i < $numpages; $i++) {

$form .= html_writer::start_div('quiz-loading-hide',

array('id' => 'quizaccess_offlinemode-attempt_page-' . $i));

foreach ($attemptobj->get_slots($i) as $slot) {

$form .= $attemptobj->render_question($slot, false,

$attemptobj->attempt_url($slot, $page));

}

$form .= html_writer::end_div('');

}

$form .= html_writer::start_tag('div', array('class' => 'submitbtns'));

$form .= html_writer::empty_tag('input', array('type' => 'submit', 'name' => 'next',

'value' => get_string('next')));

$form .= html_writer::end_tag('div');

// Some hidden fields to trach what is going on.

$form .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'attempt',

'value' => $attemptobj->get_attemptid()));

$form .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'thispage',

'value' => $page, 'id' => 'followingpage'));

$form .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'nextpage',

'value' => $nextpage));

$form .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'timeup',

'value' => '0', 'id' => 'timeup'));

$form .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'sesskey',

'value' => sesskey()));

$form .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'scrollpos',

'value' => '', 'id' => 'scrollpos'));

$form .= html_writer::empty_tag('input', array('type' => 'hidden',

'value' => $USER->id, 'id' => 'quiz-userid'));

// Add a hidden field with questionids. Do this at the end of the form, so

// if you navigate before the form has finished loading, it does not wipe all

// the student's answers.

$form .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'slots',

'value' => implode(',', $attemptobj->get_slots())));

// Summary page. Code from mod_quiz_renderer::summary_page.

$summary = '';

$summary .= html_writer::start_div('', array('id' => 'quizaccess_offlinemode-attempt_page--1'));

$summary .= $output->heading(format_string($attemptobj->get_quiz_name()));

$summary .= $output->heading(get_string('summaryofattempt', 'quiz'), 3);

$summary .= $output->summary_table($attemptobj, $attemptobj->get_display_options(false));

$controls = $output->summary_page_controls($attemptobj);

$controls = preg_replace('~<div id="quiz-timer".*?</div>~', '', $controls);

$summary .= $controls;

$summary .= html_writer::end_div('');

// Finish the form.

$form .= html_writer::end_tag('div');

$form .= html_writer::end_tag('form');

// From mod_quiz_renderer::attempt_page.

$html = '';

$html .= $output->header();

$html .= $output->quiz_notices($messages);

$html .= $form;

$html .= $summary;

$html .= $output->footer();

echo $html;