<?php
// This file is part of
//
// 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/>.

// Adds gradeimporter to add new activity page
function tool_devcourse_extend_navigation_course($navigation, $course, $coursecontext) {
    $url = new moodle_url('/admin/tool/devcourse/index.php');
    $devcoursenode = navigation_node::create('Development course', $url, navigation_node::TYPE_CUSTOM, 'Dev course', 'devcourse');
    $navigation->add_node($devcoursenode);
}

function gradeimporter_supports($feature) {
    switch ($feature) {
        case FEATURE_MOD_ARCHETYPE:
            return MOD_ARCHETYPE_RESOURCE;
        case FEATURE_GROUPS:
            return false;
        case FEATURE_GROUPINGS:
            return false;
        case FEATURE_MOD_INTRO:
            return true;
        case FEATURE_COMPLETION_TRACKS_VIEWS:
            return true;
        case FEATURE_GRADE_HAS_GRADE:
            return false;
        case FEATURE_GRADE_OUTCOMES:
            return false;
        case FEATURE_BACKUP_MOODLE2:
            return true;
        default:
            return null;
    }
}

function gradeimporter_add_instance($data, $mform) {
    /*
        *Given an object containing all the necessary data,
        *(defined by the form in mod_form.php) this function
        *creates a new instance and returns the id of this new
        *instance.
        *
        *@param $data: an object from the form in mod_form.php
        *@return int: the id of the newly inserted gradeimport record
    */
    global $DB;
    $data->timemodified = time();

    $data->id = $DB->insert_record("gradeimporter", $data);

    return $data->id;
}

function gradeimporter_update_instance($data) {
    /*
        *given an object containing all the necessary data,
        *(defined by the form in mod_form.php) this function
        *updates an existing instance with the new data.
        *
        *@param $data: an object from the form mod_form.php
        *@return boolean: if the record update was a success of fail
    */
    global $DB;

    $data->timemodified = time();
    $data->id = $data->instance;

    return $DB->update_record('gradeimporter', $data);
}

function gradeimporter_delete_instance($data) {
    /*
    *Given an id of a gradeimporter instance,
    * this function permanently deletes the instance
    * and any data that depends on it.
    *
    *@param int $id: Id of the gradeimporter instance
    *@return boolean, if the deletion was a success or
    *                 a failure.
    */

    global $DB;

    if (!$data = $DB->get_record('gradeimporter', array('id' => $id))) {
        return false;
    }

    $cm = get_coursemodule_from_instance('gradeimporter', $gradeimporter->id);

    $context = context_module::instance($cm->id);
    // Files
    $fs = get_file_storage();
    $fs->delete_area_files($context->id, 'mod_gradeimporter');

    // Delete all files and submissions associated with this instance
    $DB->delete_records('gradeimporter_submission', array('gradeimporterid' => $gradeimporter->id));
    $DB->delete_records('gradeimporter_feedback', array('gradeimporterid' => $gradeimporter->id));

    // Delete the instance itself
    $DB->delete_records('gradeimporter', array('id' => $id));
    return true;
}

function mod_gradeimporter_pluginfile($course, $cm, $context, $filearea, $args, $forcedownload, array $options=array()) {
    // Check the contextlevel is as expected - if your plugin is a block, this becomes CONTEXT_BLOCK, etc.
    if ($context->contextlevel != CONTEXT_MODULE) {
        return false;
    }
    // Make sure the filearea is one of those used by the plugin.
    if ($filearea !== 'submissionfiles') {
        return false;
    }

    // Make sure the user is logged in and has access to the module
    // (plugins that are not course modules should leave out the 'cm' part).
    require_login($course, true, $cm);

    // Check the relevant capabilities - these may vary depending on the filearea being accessed.
    if (!has_capability('mod/gradeimporter:view', $context)) {
        return false;
    }

    // Leave this line out if you set the itemid to null in make_pluginfile_url (set $itemid to 0 instead).
    $itemid = array_shift($args); // The first item in the $args array.

    // Use the itemid to retrieve any relevant data records and perform any security checks to see if the
    // user really does have access to the file in question.

    // Extract the filename / filepath from the $args array.
    $filename = array_pop($args); // The last item in the $args array.
    if (!$args) {
        $filepath = '/'; // If $args is empty => the path is '/'
    } else {
        $filepath = '/'.implode('/', $args).'/'; // If $args contains elements of the filepath
    }

    // Retrieve the file from the Files API.
    $fs = get_file_storage();
    $file = $fs->get_file($context->id, 'mod_gradeimporter', $filearea, $itemid, $filepath, $filename);
    if (!$file) {
        echo "didnt find the file";
        return false; // The file does not exist.
    }

    // We can now send the file back to the browser - in this case with a cache lifetime of 1 day and no filtering.
    send_stored_file($file, 86400, 0, $forcedownload, $options);
}