<?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/>.

/**
 * Manage files in user draft area attached to texteditor.
 *
 * @package   tiny_media
 * @copyright 2022, Stevani Andolo <stevani@hotmail.com.au>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require(__DIR__ . '/../../../../../config.php');
require_once($CFG->libdir . '/filestorage/file_storage.php');
require_once($CFG->dirroot . '/repository/lib.php');

$itemid = required_param('itemid', PARAM_INT) ?? 0;
$maxbytes = optional_param('maxbytes', 0, PARAM_INT);
$subdirs = optional_param('subdirs', 0, PARAM_INT);
$acceptedtypes = optional_param('accepted_types', '*', PARAM_RAW); // TODO Not yet passed to this script.
$returntypes = optional_param('return_types', null, PARAM_INT);
$areamaxbytes = optional_param('areamaxbytes', FILE_AREA_MAX_BYTES_UNLIMITED, PARAM_INT);
$contextid = optional_param('context', SYSCONTEXTID, PARAM_INT);
$elementid = optional_param('elementid', '', PARAM_TEXT);
$removeorphaneddrafts = optional_param('removeorphaneddrafts', 0, PARAM_INT);

$context = context::instance_by_id($contextid);
if ($context->contextlevel == CONTEXT_MODULE) {
    // Module context.
    $cm = $DB->get_record('course_modules', ['id' => $context->instanceid]);
    require_login($cm->course, true, $cm);
} else if (($coursecontext = $context->get_course_context(false)) && $coursecontext->id != SITEID) {
    // Course context or block inside the course.
    require_login($coursecontext->instanceid);
    $PAGE->set_context($context);
} else {
    // Block that is not inside the course, user or system context.
    require_login();
    $PAGE->set_context($context);
}

// Guests can never manage files.
if (isguestuser()) {
    throw new \moodle_exception('noguest');
}

$title = get_string('managefiles', 'tiny_media');

$url = new moodle_url('/lib/editor/tiny/plugins/media/manage.php', [
    'itemid' => $itemid,
    'maxbytes' => $maxbytes,
    'subdirs' => $subdirs,
    'accepted_types' => $acceptedtypes,
    'return_types' => $returntypes,
    'areamaxbytes' => $areamaxbytes,
    'context' => $contextid,
    'elementid' => $elementid,
    'removeorphaneddrafts' => $removeorphaneddrafts,
]);

$PAGE->set_url($url);
$PAGE->set_title($title);
$PAGE->set_heading($title);
$PAGE->set_pagelayout('popup');

if ($returntypes !== null) {
    // Links are allowed in textarea but never allowed in filemanager.
    $returntypes = $returntypes & ~FILE_EXTERNAL;
}

// These are the options required for the filepicker.
$options = [
    'subdirs' => $subdirs,
    'maxbytes' => $maxbytes,
    'maxfiles' => -1,
    'accepted_types' => $acceptedtypes,
    'areamaxbytes' => $areamaxbytes,
    'return_types' => $returntypes,
    'context' => $context
];

$usercontext = context_user::instance($USER->id);
$fs = get_file_storage();
$files = $fs->get_directory_files($usercontext->id, 'user', 'draft', $itemid, '/', !empty($subdirs), false);
$filenames = [];
foreach ($files as $file) {
    $filenames[$file->get_pathnamehash()] = ltrim($file->get_filepath(), '/') . $file->get_filename();
}

$mform = new tiny_media\form\manage_files_form(null, [
    'context' => $usercontext,
    'options' => $options,
    'draftitemid' => $itemid,
    'files' => $filenames,
    'elementid' => $elementid,
    'removeorphaneddrafts' => $removeorphaneddrafts,
    ], 'post', '', [
        'id' => 'tiny_media_form',
    ]
);

if ($data = $mform->get_data()) {
    if (!empty($data->deletefile)) {
        foreach (array_keys($data->deletefile) as $filehash) {
            if ($file = $fs->get_file_by_hash($filehash)) {
                // Make sure the user didn't modify the filehash to delete another file.
                if ($file->get_component() !== 'user' || $file->get_filearea() !== 'draft') {
                    // The file must belong to the user/draft area.
                    continue;
                }
                if ($file->get_contextid() != $usercontext->id) {
                    // The user must own the file - that is it must be in their user draft file area.
                    continue;
                }
                if ($file->get_itemid() != $itemid) {
                    // It must be the file they requested be deleted.
                    continue;
                }
                $file->delete();
            }
        }
    }
    // Redirect to prevent re-posting the form.
    redirect($url);
}

$mform->set_data(array_merge($options, [
    'files_filemanager' => $itemid,
    'itemid' => $itemid,
    'elementid' => $elementid,
    'context' => $context->id,
]));

echo $OUTPUT->header();
$mform->display();
echo $OUTPUT->footer();