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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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/**
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 * Callbacks.
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 *
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 * @package    core_h5p
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 * @copyright  2019 Bas Brands <bas@moodle.com>
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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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defined('MOODLE_INTERNAL') || die();
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use core_h5p\local\library\autoloader;
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/**
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 * Serve the files from the core_h5p file areas.
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 *
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 * @package core_h5p
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 * @category files
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 *
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 * @param  stdClass $course the course object
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 * @param  stdClass $cm the course module object
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 * @param  stdClass $context the newmodule's context
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 * @param  string $filearea the name of the file area
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 * @param  array $args extra arguments (itemid, path)
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 * @param  bool $forcedownload whether or not force download
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 * @param  array $options additional options affecting the file serving
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 *
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 * @return bool Returns false if we don't find a file.
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 */
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function core_h5p_pluginfile($course, $cm, $context, string $filearea, array $args, bool $forcedownload,
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    array $options = []): bool {
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    global $DB;
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    // Require classes from H5P third party library
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    autoloader::register();
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    $filesettingsset = false;
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    switch ($filearea) {
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        default:
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            return false; // Invalid file area.
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        case \core_h5p\file_storage::LIBRARY_FILEAREA:
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            if ($context->contextlevel != CONTEXT_SYSTEM) {
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                 return false; // Invalid context because the libraries are loaded always in the context system.
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            }
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            $itemid = null;
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            // The files that can be delivered to this function are unfortunately out of our control. Some of the
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            // references are embedded into the JavaScript of the files and we have no ability to inject an item id.
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            // We also don't know the location of the item id when we do include it, so we look for the first numeric
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            // value and try to serve that file.
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            foreach ($args as $key => $value) {
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                if (is_numeric($value)) {
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                    $itemid = $value;
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                    unset($args[$key]);
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                    break;
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                }
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            }
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            if (!isset($itemid)) {
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                // We didn't find an item id to use, so we fall back to retrieving the record using all the other
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                // fields. The combination of component, filearea, filepath, and filename is enough for a unique
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                // record.
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                $filename = array_pop($args);
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                $filepath = '/' . implode('/', $args) . '/';
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                $itemid = $DB->get_field('files', 'itemid', [
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                    'component' => \core_h5p\file_storage::COMPONENT,
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                    'filearea' => \core_h5p\file_storage::LIBRARY_FILEAREA,
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                    'filepath' => $filepath,
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                    'filename' => $filename
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                ]);
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                $filesettingsset = true;
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            }
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            break;
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        case \core_h5p\file_storage::CONTENT_FILEAREA:
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            if ($context->contextlevel != CONTEXT_SYSTEM) {
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                return false; // Invalid context because the content files are loaded always in the context system.
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            }
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            $itemid = array_shift($args);
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            break;
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        case \core_h5p\file_storage::CACHED_ASSETS_FILEAREA:
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        case \core_h5p\file_storage::EXPORT_FILEAREA:
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        case \core_h5p\file_storage::CSS_FILEAREA:
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            $itemid = 0;
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            break;
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    }
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    if (!$filesettingsset) {
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        $filename = array_pop($args);
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        $filepath = (!$args ? '/' : '/' . implode('/', $args) . '/');
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    }
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    $fs = get_file_storage();
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    $file = $fs->get_file($context->id, \core_h5p\file_storage::COMPONENT, $filearea, $itemid, $filepath, $filename);
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    if (!$file) {
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        return false; // No such file.
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    }
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    send_stored_file($file, null, 0, $forcedownload, $options);
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    return true;
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}