<?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/>.

/**
 * Task executor for adhoc tasks.
 *
 * @package    core
 * @subpackage cli
 * @copyright  2018 Andrew Nicols <andrew@nicols.co.uk>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

define('CLI_SCRIPT', true);

require(__DIR__ . '/../../config.php');
require_once("{$CFG->libdir}/clilib.php");
require_once("{$CFG->libdir}/cronlib.php");

list($options, $unrecognized) = cli_get_params(
    [
        'execute' => false,
        'help' => false,
        'keep-alive' => 0,
        'showsql' => false,
        'showdebugging' => false,
        'ignorelimits' => false,
        'force' => false,
    ], [
        'h' => 'help',
        'e' => 'execute',
        'k' => 'keep-alive',
        'i' => 'ignorelimits',
        'f' => 'force',
    ]
);

if ($unrecognized) {
    $unrecognized = implode("\n  ", $unrecognized);
    cli_error(get_string('cliunknowoption', 'admin', $unrecognized));
}

if ($options['help'] or empty($options['execute'])) {
    $help = <<<EOT
Ad hoc cron tasks.

Options:
 -h, --help                Print out this help
     --showsql             Show sql queries before they are executed
     --showdebugging       Show developer level debugging information
 -e, --execute             Run all queued adhoc tasks
 -k, --keep-alive=N        Keep this script alive for N seconds and poll for new adhoc tasks
 -i  --ignorelimits        Ignore task_adhoc_concurrency_limit and task_adhoc_max_runtime limits
 -f, --force               Run even if cron is disabled

Example:
\$sudo -u www-data /usr/bin/php admin/cli/adhoc_task.php --execute

EOT;

    echo $help;
    die;
}

if ($options['showdebugging']) {
    set_debugging(DEBUG_DEVELOPER, true);
}

if ($options['showsql']) {
    $DB->set_debug(true);
}

if (CLI_MAINTENANCE) {
    echo "CLI maintenance mode active, cron execution suspended.\n";
    exit(1);
}

if (moodle_needs_upgrading()) {
    echo "Moodle upgrade pending, cron execution suspended.\n";
    exit(1);
}

if (empty($options['execute'])) {
    exit(0);
}

if (!get_config('core', 'cron_enabled') && !$options['force']) {
    mtrace('Cron is disabled. Use --force to override.');
    exit(1);
}

if (empty($options['keep-alive'])) {
    $options['keep-alive'] = 0;
}

if (!empty($CFG->showcronsql)) {
    $DB->set_debug(true);
}
if (!empty($CFG->showcrondebugging)) {
    set_debugging(DEBUG_DEVELOPER, true);
}

$checklimits = empty($options['ignorelimits']);

core_php_time_limit::raise();

// Increase memory limit.
raise_memory_limit(MEMORY_EXTRA);

// Emulate normal session - we use admin account by default.
cron_setup_user();

$humantimenow = date('r', time());
$keepalive = (int)$options['keep-alive'];

\core\local\cli\shutdown::script_supports_graceful_exit();

mtrace("Server Time: {$humantimenow}\n");
cron_run_adhoc_tasks(time(), $keepalive, $checklimits);