<?php
namespace MailPoet\Cron;

use MailPoet\Cron\Workers\Scheduler as SchedulerWorker;
use MailPoet\Cron\Workers\SendingQueue\SendingQueue as SendingQueueWorker;
use MailPoet\Mailer\MailerLog;
use MailPoet\Models\Setting;

if(!defined('ABSPATH')) exit;

class CronTrigger {
  const METHOD_WORDPRESS = 'WordPress';
  const METHOD_MAILPOET = 'MailPoet';
  const SETTING_NAME = 'cron_trigger';

  function __construct() {
    $this->method = self::getCurrentMethod();
  }

  function init() {
    try {
      // configure task scheduler only outside of cli environment
      if(php_sapi_name() === 'cli') return;
      switch($this->method) {
        case self::METHOD_MAILPOET:
          return $this->configureMailpoetTrigger();
        case self::METHOD_WORDPRESS:
          return $this->configureWordpressTrigger();
        default:
          throw new \Exception(__('Task scheduler is not configured'));
      };
    } catch(\Exception $e) {
      // ignore exceptions as they should not prevent the rest of the site from loading
    }
  }

  function configureMailpoetTrigger() {
    $supervisor = new Supervisor();
    $supervisor->checkDaemon();
  }

  function configureWordpressTrigger() {
    $scheduled_queues = SchedulerWorker::getScheduledQueues();
    $running_queues = SendingQueueWorker::getRunningQueues();
    $sending_limit_reached = MailerLog::isSendingLimitReached();
    // run cron only when:
    //   1) there are scheduled queues ready to be processed
    //   2) queues are already being processed
    //   3) sending limit has not been reached
    if(($scheduled_queues || $running_queues) && !$sending_limit_reached) {
      return $this->configureMailpoetTrigger();
    }
    // in all other cases stop (delete) the daemon
    $cron_daemon = CronHelper::getDaemon();
    if($cron_daemon) {
      CronHelper::deleteDaemon();
    }
  }

  static function getAvailableMethods() {
    return array(
      'mailpoet' => self::METHOD_MAILPOET,
      'wordpress' => self::METHOD_WORDPRESS
    );
  }

  static function getCurrentMethod() {
    return Setting::getValue('cron_trigger.method');
  }
}