<?php

define('CLI_SCRIPT', true);
require(__DIR__ . '/../../config.php');
require_once($CFG->libdir . '/clilib.php');
require_once($CFG->libdir . '/enrollib.php');
require_once($CFG->libdir . '/completionlib.php');
require_once($CFG->dirroot . '/backup/util/includes/backup_includes.php');

$usage = "Usage:
    unenroll.php --username=<username> --shortname=<shortname>

Options:
    --username    The username of the user to unenroll.
    --shortname   The shortname of the course to unenroll the user from.

";

list($options, $unrecognized) = cli_get_params(
    [
        'username' => null,
        'shortname' => null,
        'help' => false,
    ],
    ['h' => 'help']
);

if ($options['help'] || !$options['username'] || !$options['shortname']) {
    echo $usage;
    exit(0);
}

$username = $options['username'];
$shortname = $options['shortname'];

try {
    $user = $DB->get_record('user', array('username' => $username), '*', MUST_EXIST);
} catch (Exception $ex) {
    cli_error('User ' . $username . ' does not exist.');
}

try {
    $course = $DB->get_record('course', array('shortname' => $shortname), '*', MUST_EXIST);
} catch (Exception $ex) {
    cli_error('Course ' . $shortname . ' does not exist.');
}

$context = context_course::instance($course->id);

$courseid = $course->id;
$userid = $user->id;

$context = context_course::instance($courseid);
$enrolinstances = enrol_get_instances($courseid, true);
$enrolplugin = enrol_get_plugin('manual');

$manualinstance = null;
foreach ($enrolinstances as $instance) {
    if ($instance->enrol == 'manual') {
        $manualinstance = $instance;
        break;
    }
}
if ($manualinstance === null) {
    cli_error('No manual enrollment instance found for the course.');
}

$enrolplugin->unenrol_user($manualinstance, $userid);

$DB->delete_records('course_completions', ['userid' => $userid, 'course' => $courseid]);
$DB->delete_records('course_completion_crit_compl', ['userid' => $userid, 'course' => $courseid]);

backup_plan_builder::delete_course_userdata($userid, $courseid);

cli_writeln("User '{$username}' has been unenrolled from course '{$shortname}' and their completion data has been removed.");