<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014  Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
 * Website: http://www.espocrm.com
 *
 * EspoCRM 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.
 *
 * EspoCRM 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 EspoCRM. If not, see http://www.gnu.org/licenses/.
 ************************************************************************/

namespace Espo\Core;

class CronManager
{
    private $container;
    private $config;
    private $fileManager;

    private $scheduledJobCron;
    private $serviceCron;

    private $jobService;
    private $scheduledJobService;

    const PENDING = 'Pending';
    const RUNNING = 'Running';
    const SUCCESS = 'Success';
    const FAILED = 'Failed';

    protected $lastRunTime = 'data/cache/application/cronLastRunTime.php';


    public function __construct(\Espo\Core\Container $container)
    {
        $this->container = $container;

        $this->config = $this->container->get('config');
        $this->fileManager = $this->container->get('fileManager');

        $this->scheduledJobCron = $this->container->get('scheduledJob');
        $this->serviceCron = new \Espo\Core\Cron\Service( $this->container->get('serviceFactory'));

        $this->jobService = $this->container->get('serviceFactory')->create('job');
        $this->scheduledJobService = $this->container->get('serviceFactory')->create('scheduledJob');
    }

    protected function getContainer()
    {
        return $this->container;
    }

    protected function getConfig()
    {
        return $this->config;
    }

    protected function getFileManager()
    {
        return $this->fileManager;
    }

    protected function getJobService()
    {
        return $this->jobService;
    }

    protected function getScheduledJobService()
    {
        return $this->scheduledJobService;
    }

    protected function getScheduledJobCron()
    {
        return $this->scheduledJobCron;
    }

    protected function getServiceCron()
    {
        return $this->serviceCron;
    }


    protected function getLastRunTime()
    {
        $lastRunTime = $this->getFileManager()->getContents($this->lastRunTime);
        if (!is_int($lastRunTime)) {
            $lastRunTime = time() - (intval($this->getConfig()->get('cron.minExecutionTime')) + 60);
        }

        return $lastRunTime;
    }

    protected function setLastRunTime($time)
    {
        return $this->getFileManager()->putContentsPHP($this->lastRunTime, $time);
    }

    protected function checkLastRunTime()
    {
        $currentTime = time();
        $lastRunTime = $this->getLastRunTime();
        $minTime = $this->getConfig()->get('cron.minExecutionTime');

        if ($currentTime > ($lastRunTime + $minTime) ) {
            return true;
        }

        return false;
    }


    public function run()
    {
        if (!$this->checkLastRunTime()) {
            $GLOBALS['log']->info('Cron Manager: Stop cron running, too frequency execution');
            return; //stop cron running, too frequency execution
        }

        $this->setLastRunTime(time());

        //Check scheduled jobs and create related jobs
        $this->createJobsFromScheduledJobs();

        $pendingJobs = $this->getJobService()->getPendingJobs();

        foreach ($pendingJobs as $job) {

            $this->getJobService()->updateEntity($job['id'], array(
                'status' => self::RUNNING,
            ));

            $isSuccess = true;

            try {
                if (!empty($job['scheduled_job_id'])) {
                    $this->getScheduledJobCron()->run($job);
                } else {
                    $this->getServiceCron()->run($job);
                }
            } catch (\Exception $e) {
                $isSuccess = false;
                $GLOBALS['log']->error('Failed job running, job ['.$job['id'].']. Error Details: '.$e->getMessage());
            }

            $status = $isSuccess ? self::SUCCESS : self::FAILED;

            $this->getJobService()->updateEntity($job['id'], array(
                'status' => $status,
            ));

            //set status in the schedulerJobLog
            if (!empty($job['scheduled_job_id'])) {
                $this->getScheduledJobService()->addLogRecord($job['scheduled_job_id'], $status);
            }
        }

    }

    /**
     * Check scheduled jobs and create related jobs
     * @return array List of created Jobs
     */
    protected function createJobsFromScheduledJobs()
    {
        $activeScheduledJobs = $this->getScheduledJobService()->getActiveJobs();

        $createdJobs = array();
        foreach ($activeScheduledJobs as $scheduledJob) {

            $scheduling = $scheduledJob['scheduling'];

            $cronExpression = \Cron\CronExpression::factory($scheduling);

            try {
                $prevDate = $cronExpression->getPreviousRunDate()->format('Y-m-d H:i:s');
            } catch (\Exception $e) {
                $GLOBALS['log']->error('ScheduledJob ['.$scheduledJob['id'].']: CronExpression - Impossible CRON expression ['.$scheduling.']');
                continue;
            }

            if ($cronExpression->isDue()) {
                $prevDate = date('Y-m-d H:i:00');
            }

            $existsJob = $this->getJobService()->getJobByScheduledJob($scheduledJob['id'], $prevDate);

            if (!isset($existsJob) || empty($existsJob)) {
                //create a job
                $data = array(
                    'name' => $scheduledJob['name'],
                    'status' => self::PENDING,
                    'scheduledJobId' => $scheduledJob['id'],
                    'executeTime' => $prevDate,
                    'method' => $scheduledJob['job'],
                );
                $createdJobs[] = $this->getJobService()->createEntity($data);
            }
        }

        return $createdJobs;
    }
}