<?php
/**
 * Copyright © 2013-2017 Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Framework\App;

use Magento\Framework\ObjectManager\ConfigLoaderInterface;

/**
 * Entry point for retrieving static resources like JS, CSS, images by requested public path
 *
 * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
 */
class StaticResource implements \Magento\Framework\AppInterface
{
    /**
     * @var State
     */
    private $state;

    /**
     * @var \Magento\Framework\App\Response\FileInterface
     */
    private $response;

    /**
     * @var Request\Http
     */
    private $request;

    /**
     * @var View\Asset\Publisher
     */
    private $publisher;

    /**
     * @var \Magento\Framework\View\Asset\Repository
     */
    private $assetRepo;

    /**
     * @var \Magento\Framework\Module\ModuleList
     */
    private $moduleList;

    /**
     * @var \Magento\Framework\ObjectManagerInterface
     */
    private $objectManager;

    /**
     * @var ConfigLoaderInterface
     */
    private $configLoader;

    /**
     * @param State $state
     * @param Response\FileInterface $response
     * @param Request\Http $request
     * @param View\Asset\Publisher $publisher
     * @param \Magento\Framework\View\Asset\Repository $assetRepo
     * @param \Magento\Framework\Module\ModuleList $moduleList
     * @param \Magento\Framework\ObjectManagerInterface $objectManager
     * @param ConfigLoaderInterface $configLoader
     */
    public function __construct(
        State $state,
        Response\FileInterface $response,
        Request\Http $request,
        View\Asset\Publisher $publisher,
        \Magento\Framework\View\Asset\Repository $assetRepo,
        \Magento\Framework\Module\ModuleList $moduleList,
        \Magento\Framework\ObjectManagerInterface $objectManager,
        ConfigLoaderInterface $configLoader
    ) {
        $this->state = $state;
        $this->response = $response;
        $this->request = $request;
        $this->publisher = $publisher;
        $this->assetRepo = $assetRepo;
        $this->moduleList = $moduleList;
        $this->objectManager = $objectManager;
        $this->configLoader = $configLoader;
    }

    /**
     * Finds requested resource and provides it to the client
     *
     * @return \Magento\Framework\App\ResponseInterface
     * @throws \Exception
     */
    public function launch()
    {
        // disabling profiling when retrieving static resource
        \Magento\Framework\Profiler::reset();
        $appMode = $this->state->getMode();
        if ($appMode == \Magento\Framework\App\State::MODE_PRODUCTION) {
            $this->response->setHttpResponseCode(404);
        } else {
            $path = $this->request->get('resource');
            $params = $this->parsePath($path);
            $this->state->setAreaCode($params['area']);
            $this->objectManager->configure($this->configLoader->load($params['area']));
            $file = $params['file'];
            unset($params['file']);
            $asset = $this->assetRepo->createAsset($file, $params);
            $this->response->setFilePath($asset->getSourceFile());
            $this->publisher->publish($asset);
        }
        return $this->response;
    }

    /**
     * {@inheritdoc}
     */
    public function catchException(Bootstrap $bootstrap, \Exception $exception)
    {
        $this->response->setHttpResponseCode(404);
        $this->response->setHeader('Content-Type', 'text/plain');
        if ($bootstrap->isDeveloperMode()) {
            $this->response->setBody($exception->getMessage() . "\n" . $exception->getTraceAsString());
        }
        $this->response->sendResponse();
        return true;
    }

    /**
     * Parse path to identify parts needed for searching original file
     *
     * @param string $path
     * @throws \InvalidArgumentException
     * @return array
     */
    protected function parsePath($path)
    {
        $path = ltrim($path, '/');
        $parts = explode('/', $path, 6);
        if (count($parts) < 5) {
            throw new \InvalidArgumentException("Requested path '$path' is wrong.");
        }
        $result = [];
        $result['area'] = $parts[0];
        $result['theme'] = $parts[1] . '/' . $parts[2];
        $result['locale'] = $parts[3];
        if (count($parts) >= 6 && $this->moduleList->has($parts[4])) {
            $result['module'] = $parts[4];
        } else {
            $result['module'] = '';
            if (isset($parts[5])) {
                $parts[5] = $parts[4] . '/' . $parts[5];
            } else {
                $parts[5] = $parts[4];
            }
        }
        $result['file'] = $parts[5];
        return $result;
    }
}
