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<?php
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// 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/>.

/**
 * Process ajax requests
 *
 * @package assignfeedback_editpdfplus
 * @copyright  2012 Davo Smith
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
use \assignfeedback_editpdfplus\document_services;
use \assignfeedback_editpdfplus\page_editor;
use \assignfeedback_editpdfplus\comments_quick_list;

define('AJAX_SCRIPT', true);

require('../../../../config.php');
require_once($CFG->dirroot . '/mod/assign/locallib.php');

require_sesskey();

$action = optional_param('action', '', PARAM_ALPHANUM);
$assignmentid = required_param('assignmentid', PARAM_INT);
$userid = required_param('userid', PARAM_INT);
$attemptnumber = required_param('attemptnumber', PARAM_INT);
$readonly = optional_param('readonly', false, PARAM_BOOL);

$cm = \get_coursemodule_from_instance('assign', $assignmentid, 0, false, MUST_EXIST);
$context = \context_module::instance($cm->id);

$assignment = new \assign($context, null, null);

require_login($assignment->get_course(), false, $cm);

if (!$assignment->can_view_submission($userid)) {
    print_error('nopermission');
}

if ($action == 'loadallpages') {
    $draft = true;
    if (!has_capability('mod/assign:grade', $context)) {
        $draft = false;
        $readonly = true; // A student always sees the readonly version.
        require_capability('mod/assign:submit', $context);
    }

    // Whoever is viewing the readonly version should not use the drafts, but the actual annotations.
    if ($readonly) {
        $draft = false;
    }

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    $pages = document_services::get_page_images_for_attempt($assignment, $userid, $attemptnumber, $readonly);
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    $response = new stdClass();
    $response->pagecount = count($pages);
    $response->pages = array();

    $grade = $assignment->get_user_grade($userid, true);

    // The readonly files are stored in a different file area.
    $filearea = document_services::PAGE_IMAGE_FILEAREA;
    if ($readonly) {
        $filearea = document_services::PAGE_IMAGE_READONLY_FILEAREA;
    }

    foreach ($pages as $id => $pagefile) {
        $index = count($response->pages);
        $page = new stdClass();
        $comments = page_editor::get_comments($grade->id, $index, $draft);
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        $page->url = moodle_url::make_pluginfile_url($context->id, 'assignfeedback_editpdfplus', $filearea, $grade->id, '/', $pagefile->get_filename())->out();
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        $page->comments = $comments;
        if ($imageinfo = $pagefile->get_imageinfo()) {
            $page->width = $imageinfo['width'];
            $page->height = $imageinfo['height'];
        } else {
            $page->width = 0;
            $page->height = 0;
        }
        $annotations = page_editor::get_annotations($grade->id, $index, $draft);
        $page->annotations = $annotations;
        array_push($response->pages, $page);
    }

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    $tools = page_editor::get_tools(null);
    $typetools = page_editor::get_typetools(null);
    $axis = page_editor::get_axis(null);
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    $response->tools = $tools;
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    $response->typetools = $typetools;
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    $response->axis = $axis;
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    echo json_encode($response);
    die();
} else if ($action == 'savepage') {
    require_capability('mod/assign:grade', $context);

    $response = new stdClass();
    $response->errors = array();

    $grade = $assignment->get_user_grade($userid, true);

    $pagejson = required_param('page', PARAM_RAW);
    $page = json_decode($pagejson);
    $index = required_param('index', PARAM_INT);

    $added = page_editor::set_comments($grade->id, $index, $page->comments);
    if ($added != count($page->comments)) {
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        array_push($response->errors, get_string('couldnotsavepage', 'assignfeedback_editpdfplus', $index + 1));
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    }
    $added = page_editor::set_annotations($grade->id, $index, $page->annotations);
    if ($added != count($page->annotations)) {
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        array_push($response->errors, get_string('couldnotsavepage', 'assignfeedback_editpdfplus', $index + 1));
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    }
    echo json_encode($response);
    die();
} else if ($action == 'generatepdf') {
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    $refresh = optional_param('refresh', false, PARAM_BOOL);
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    if (!$refresh) {
        require_capability('mod/assign:grade', $context);
    } else {
        require_capability('mod/assign:submit', $context);
    }
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    $response = new stdClass();
    $grade = $assignment->get_user_grade($userid, true);
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    $file = document_services::generate_feedback_document($assignment, $userid, $attemptnumber, $refresh);
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    $response->url = '';
    if ($file) {
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        $url = moodle_url::make_pluginfile_url($assignment->get_context()->id, 'assignfeedback_editpdfplus', document_services::FINAL_PDF_FILEAREA, $grade->id, '/', $file->get_filename(), false);
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        $response->url = $url->out(true);
        $response->filename = $file->get_filename();
    }

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    if ($refresh) {
        $teachers = get_users_by_capability($context, 'mod/assign:grade');
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        $body = "La correction du devoir a été mise à jour. Vous pouvez accéder au document en suivant ce lien : "
                . $response->url
                . "\n\nCeci est un mail automatique.";
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        $bodyhtml = "<html><b>Information Moodle</b><br/>"
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                . "<p>La correction du devoir a été mise à jour. Vous pouvez accéder au document en suivant ce <a href='"
                . $response->url
                . "'>lien</a></p>"
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                . "<i>Ceci est un mail automatique.</i></html>";
        foreach ($teachers as $teacher) {
            $res = email_to_user($teacher, $USER, "[Moodle] Mise à jour devoir", $body, $bodyhtml);
        }
    }

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    echo json_encode($response);
    die();
} else if ($action == 'loadquicklist') {
    require_capability('mod/assign:grade', $context);

    $result = comments_quick_list::get_comments();

    echo json_encode($result);
    die();
} else if ($action == 'addtoquicklist') {
    require_capability('mod/assign:grade', $context);

    $comment = required_param('commenttext', PARAM_RAW);
    $width = required_param('width', PARAM_INT);
    $colour = required_param('colour', PARAM_ALPHA);

    $result = comments_quick_list::add_comment($comment, $width, $colour);

    echo json_encode($result);
    die();
} else if ($action == 'revertchanges') {
    require_capability('mod/assign:grade', $context);

    $grade = $assignment->get_user_grade($userid, true);

    $result = page_editor::revert_drafts($gradeid);

    echo json_encode($result);
    die();
} else if ($action == 'removefromquicklist') {
    require_capability('mod/assign:grade', $context);

    $commentid = required_param('commentid', PARAM_INT);

    $result = comments_quick_list::remove_comment($commentid);

    echo json_encode($result);
    die();
} else if ($action == 'deletefeedbackdocument') {
    require_capability('mod/assign:grade', $context);

    $grade = $assignment->get_user_grade($userid, true);
    $result = document_services::delete_feedback_document($assignment, $userid, $attemptnumber);

    $result = $result && page_editor::unrelease_drafts($grade->id);
    echo json_encode($result);
    die();
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} else if ($action == 'updatestudentview') {
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    require_capability('mod/assign:submit', $context);
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    $response = new stdClass();
    $response->errors = array();

    $grade = $assignment->get_user_grade($userid, true);

    $pagejson = required_param('page', PARAM_RAW);
    $page = json_decode($pagejson);
    $index = required_param('index', PARAM_INT);

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    $added = page_editor::update_annotations_status($page->annotations);
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    if ($added != count($page->annotations)) {
        array_push($response->errors, get_string('couldnotsavepage', 'assignfeedback_editpdfplus', $index + 1));
    }
    echo json_encode($response);
    die();
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}