<?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/>.

/**
 * Display example submission followed by its reference assessment and the user's assessment to compare them
 *
 * @package   mod-workshop
 * @copyright 2009 David Mudrak <david.mudrak@gmail.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once(dirname(dirname(dirname(__FILE__))).'/config.php');
require_once(dirname(__FILE__).'/locallib.php');

$cmid   = required_param('cmid', PARAM_INT);    // course module id
$sid    = required_param('sid', PARAM_INT);     // example submission id
$aid    = required_param('aid', PARAM_INT);     // the user's assessment id

$cm     = get_coursemodule_from_id('workshop', $cmid, 0, false, MUST_EXIST);
$course = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);

require_login($course, false, $cm);
if (isguestuser()) {
    print_error('guestsarenotallowed');
}

$workshop = $DB->get_record('workshop', array('id' => $cm->instance), '*', MUST_EXIST);
$workshop = new workshop($workshop, $cm, $course);
$strategy = $workshop->grading_strategy_instance();

$PAGE->set_url($workshop->excompare_url($sid, $aid));

$example    = $workshop->get_example_by_id($sid);
$assessment = $workshop->get_assessment_by_id($aid);
if ($assessment->submissionid != $example->id) {
   print_error('invalidarguments');
}
$mformassessment = $strategy->get_assessment_form($PAGE->url, 'assessment', $assessment, false);
if ($refasid = $DB->get_field('workshop_assessments', 'id', array('submissionid' => $example->id, 'weight' => 1))) {
    $reference = $workshop->get_assessment_by_id($refasid);
    $mformreference = $strategy->get_assessment_form($PAGE->url, 'assessment', $reference, false);
}

$canmanage  = has_capability('mod/workshop:manageexamples', $workshop->context);
$isreviewer = ($USER->id == $assessment->reviewerid);

if ($canmanage) {
    // ok you can go
} elseif ($isreviewer and $workshop->assessing_examples_allowed()) {
    // ok you can go
} else {
    print_error('nopermissions', 'error', $workshop->view_url(), 'compare example assessment');
}

$PAGE->set_title($workshop->name);
$PAGE->set_heading($course->fullname);
$PAGE->navbar->add(get_string('examplecomparing', 'workshop'));
$wsoutput = $PAGE->get_renderer('mod_workshop');

// Output starts here
echo $OUTPUT->header();
echo $OUTPUT->heading(get_string('assessedexample', 'workshop'), 2);

echo $wsoutput->example_full($example, true);

if (!empty($mformreference)) {
    echo $OUTPUT->heading(get_string('assessmentreference', 'workshop'), 2);
    $a = new stdclass();
    $a->received = $workshop->real_grade($reference->grade);
    $a->max = $workshop->real_grade(100);
    echo $OUTPUT->heading(get_string('gradeinfo', 'workshop' , $a), 3);
    $mformreference->display();
}

if ($isreviewer) {
    echo $OUTPUT->heading(get_string('assessmentbyyourself', 'workshop'), 2);
} elseif ($canmanage) {
    $reviewer   = new stdclass();
    $reviewer->firstname = $assessment->reviewerfirstname;
    $reviewer->lastname = $assessment->reviewerlastname;
    echo $OUTPUT->heading(get_string('assessmentbyknown', 'workshop', fullname($reviewer)), 2);
}
$a = new stdclass();
$a->received = $workshop->real_grade($assessment->grade);
$a->max = $workshop->real_grade(100);
echo $OUTPUT->heading(get_string('gradeinfo', 'workshop' , $a), 3);
$mformassessment->display();
echo $OUTPUT->container_start('buttonsbar');
if ($isreviewer and $workshop->assessing_examples_allowed()) {
    $aurl = new moodle_url($workshop->exsubmission_url($example->id), array('assess' => 'on', 'sesskey' => sesskey()));
    echo $OUTPUT->single_button($aurl, get_string('reassess', 'workshop'), 'get');
}
echo $OUTPUT->container_end(); // buttonsbar

echo $OUTPUT->footer();