<?php
/**
* Copyright © 2016 Magento. All rights reserved.
* See COPYING.txt for license details.
*/

namespace Magento\Composer;

use Composer\Console\Application;
use Composer\IO\BufferIO;
use Composer\Factory as ComposerFactory;
use Symfony\Component\Console\Output\BufferedOutput;

/**
* Class MagentoComposerApplication
*
* This class provides ability to set composer application settings and run any composer command.
* Also provides method to get Composer instance so you can have access composer properties lie Locker
*/
class MagentoComposerApplication
{

const COMPOSER_WORKING_DIR = '--working-dir';

/**
* Path to Composer home directory
*
* @var string
*/
private $composerHome;

/**
* Path to composer.json file
*
* @var string
*/
private $composerJson;

/**
* Buffered output
*
* @var BufferedOutput
*/
private $consoleOutput;

/**
* @var ConsoleArrayInputFactory
*/
private $consoleArrayInputFactory;

/**
* @var Application
*/
private $consoleApplication;

/**
* Constructs class
*
* @param string $pathToComposerHome
* @param string $pathToComposerJson
* @param Application $consoleApplication
* @param ConsoleArrayInputFactory $consoleArrayInputFactory
* @param BufferedOutput $consoleOutput
*/
public function __construct(
$pathToComposerHome,
$pathToComposerJson,
Application $consoleApplication = null,
ConsoleArrayInputFactory $consoleArrayInputFactory = null,
BufferedOutput $consoleOutput = null
) {
$this->consoleApplication = $consoleApplication ? $consoleApplication : new Application();
$this->consoleArrayInputFactory = $consoleArrayInputFactory ? $consoleArrayInputFactory
: new ConsoleArrayInputFactory();
$this->consoleOutput = $consoleOutput ? $consoleOutput : new BufferedOutput();

$this->composerJson = $pathToComposerJson;
$this->composerHome = $pathToComposerHome;

putenv('COMPOSER_HOME=' . $pathToComposerHome);

$this->consoleApplication->setAutoExit(false);
}

/**
* Creates composer object
*
* @return \Composer\Composer
* @throws \Exception
*/
public function createComposer()
{
return ComposerFactory::create(new BufferIO(), $this->composerJson);
}

/**
* Runs composer command
*
* @param array $commandParams
* @param string|null $workingDir
* @return bool
* @throws \RuntimeException
*/
public function runComposerCommand(array $commandParams, $workingDir = null)
{
$this->consoleApplication->resetComposer();

if ($workingDir) {
$commandParams[self::COMPOSER_WORKING_DIR] = $workingDir;
} else {
$commandParams[self::COMPOSER_WORKING_DIR] = dirname($this->composerJson);
}

$input = $this->consoleArrayInputFactory->create($commandParams);

$exitCode = $this->consoleApplication->run($input, $this->consoleOutput);

if ($exitCode) {
throw new \RuntimeException(
sprintf('Command "%s" failed: %s', $commandParams['command'], $this->consoleOutput->fetch())
);
}

return $this->consoleOutput->fetch();
}
}