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<?php

namespace Consolidation\SiteProcess\Transport;

use Consolidation\SiteProcess\SiteProcess;
use Consolidation\SiteProcess\Util\Escape;
use Consolidation\SiteAlias\SiteAliasInterface;
use Consolidation\SiteProcess\Util\Shell;

/**
 * VagrantTransport knows how to wrap a command such that it runs on a remote
 * system via the vagrant cli.
 */
class VagrantTransport implements TransportInterface
{
    protected $tty;
    protected $siteAlias;

    public function __construct(SiteAliasInterface $siteAlias)
    {
        $this->siteAlias = $siteAlias;
    }

    /**
     * @inheritdoc
     */
    public function configure(SiteProcess $process)
    {
        $this->tty = $process->isTty();
    }

    /**
     * inheritdoc
     */
    public function wrap($args)
    {
        $transport = ['vagrant', 'ssh'];
        $transportOptions = $this->getTransportOptions();
        $commandToExecute = $this->getCommandToExecute($args);

        return array_merge(
            $transport,
            $transportOptions,
            ['-c'],
            $commandToExecute
        );
    }

    /**
     * @inheritdoc
     */
    public function addChdir($cd_remote, $args)
    {
        return array_merge(
            [
                'cd',
                $cd_remote,
                Shell::op('&&'),
            ],
            $args
        );
    }

    /**
     * getTransportOptions returns the transport options for the tranport
     * mechanism itself
     */
    protected function getTransportOptions()
    {
        return $this->tty ? ['-t'] : [];
    }

    /**
     * getCommandToExecute processes the arguments for the command to
     * be executed such that they are appropriate for the transport mechanism.
     */
    protected function getCommandToExecute($args)
    {
        // Escape each argument for the target system and then join
        $args = Escape::argsForSite($this->siteAlias, $args);
        $commandToExecute = implode(' ', $args);

        return [$commandToExecute];
    }
}