<?php
namespace App\Lib;

use App\Application;

class ServerManager
{
    protected $app = null;

    public function __construct(Application $app)
    {
        $this->app = $app;

        if (empty($this->app['config']['path'])) {
            throw new \Exception('Invalid or empty server path!');
        }

        if (empty($this->app['config']['file'])) {
            throw new \Exception('Invalid or empty server file!');
        }
    }

    public function getStartCommand()
    {
        if (isset($this->app['config']['commands']) && isset($this->app['config']['commands']['start'])) {
            return $this->parse($this->app['config']['commands']['start']);
        }

        return $this->parse('cd %path% && screen -dmS %prefix%%file% ./%file%');
    }

    public function start()
    {
        if ($this->isRunning()) {
            throw new \RuntimeException('Server is already running, can\'t start twice.');
        }

        $cmd = $this->getStartCommand();

        $this->app['system']->execute($cmd);

        $this->app['monolog']->addInfo('Server was started (' . $cmd . ')');
    }

    public function getStopCommand()
    {
        if (isset($this->app['config']['commands']) && isset($this->app['config']['commands']['stop'])) {
            return $this->parse($this->app['config']['commands']['stop']);
        }

        return $this->parse('screen -S %prefix%%file% -p 0 -X quit');
    }

    public function stop()
    {
        $cmd = $this->getStopCommand();
        $this->app['system']->execute($cmd);

        $this->app['monolog']->addInfo('Server was stopped (' . $cmd . ')');
    }

    public function restart()
    {
        if ($this->isRunning()) {
            $this->stop();
            sleep(1);
        }

        $this->start();

        $this->app['monolog']->addInfo('Server was restarted');
    }

    public function getIsRunningCommand()
    {
        if (isset($this->app['config']['commands']) && isset($this->app['config']['commands']['is_running'])) {
            return $this->parse($this->app['config']['commands']['is_running']);
        }

        return $this->parse('screen -ls | grep -c %prefix%%file%');
    }

    public function isRunning()
    {
        $cmd = $this->getIsRunningCommand();

        return (int) $this->app['system']->execute($cmd);
    }

    protected function parse($content)
    {
        return str_replace(array('%path%', '%file%', '%prefix%'),
            array(
                $this->app['config']['path'],
                $this->app['config']['file'],
                isset($this->app['config']['prefix']) ? $this->app['config']['prefix'] : ''
            ),
            $content);
    }
}