class ServerCommand

class ServerCommand extends Command {
    
    /**
     * The class loader.
     *
     * @var object
     */
    protected $classLoader;
    
    /**
     * Constructs a new ServerCommand command.
     *
     * @param object $class_loader
     *   The class loader.
     */
    public function __construct($class_loader) {
        parent::__construct('server');
        $this->classLoader = $class_loader;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function configure() {
        $this->setDescription('Starts up a webserver for a site.')
            ->addOption('host', NULL, InputOption::VALUE_OPTIONAL, 'Provide a host for the server to run on.', '127.0.0.1')
            ->addOption('port', NULL, InputOption::VALUE_OPTIONAL, 'Provide a port for the server to run on. Will be determined automatically if none supplied.')
            ->addOption('suppress-login', 's', InputOption::VALUE_NONE, 'Disable opening a login URL in a browser.')
            ->addUsage('--host localhost --port 8080')
            ->addUsage('--host my-site.com --port 80');
    }
    
    /**
     * {@inheritdoc}
     */
    protected function execute(InputInterface $input, OutputInterface $output) : int {
        $io = new SymfonyStyle($input, $output);
        $host = $input->getOption('host');
        $port = $input->getOption('port');
        if (!$port) {
            $port = $this->findAvailablePort($host);
        }
        if (!$port) {
            $io->getErrorStyle()
                ->error('Unable to automatically determine a port. Use the --port to hardcode an available port.');
        }
        try {
            $kernel = $this->boot();
        } catch (ConnectionNotDefinedException) {
            $io->getErrorStyle()
                ->error("No installation found. Use the 'install' command.");
            return 1;
        }
        return $this->start($host, $port, $kernel, $input, $io);
    }
    
    /**
     * Boots up a Drupal environment.
     *
     * @return \Drupal\Core\DrupalKernelInterface
     *   The Drupal kernel.
     *
     * @throws \Exception
     *   Exception thrown if kernel does not boot.
     */
    protected function boot() {
        $kernel = new DrupalKernel('prod', $this->classLoader, FALSE);
        $kernel::bootEnvironment();
        $kernel->setSitePath($this->getSitePath());
        Settings::initialize($kernel->getAppRoot(), $kernel->getSitePath(), $this->classLoader);
        $kernel->boot();
        // Some services require a request to work. For example, CommentManager.
        // This is needed as generating the URL fires up entity load hooks.
        $kernel->getContainer()
            ->get('request_stack')
            ->push(Request::createFromGlobals());
        return $kernel;
    }
    
    /**
     * Finds an available port.
     *
     * @param string $host
     *   The host to find a port on.
     *
     * @return int|false
     *   The available port or FALSE, if no available port found,
     */
    protected function findAvailablePort($host) {
        $port = 8888;
        while ($port >= 8888 && $port <= 9999) {
            $connection = @fsockopen($host, $port);
            if (is_resource($connection)) {
                // Port is being used.
                fclose($connection);
            }
            else {
                // Port is available.
                return $port;
            }
            $port++;
        }
        return FALSE;
    }
    
    /**
     * Opens a URL in your system default browser.
     *
     * @param string $url
     *   The URL to browser to.
     * @param \Symfony\Component\Console\Style\SymfonyStyle $io
     *   The IO.
     */
    protected function openBrowser($url, SymfonyStyle $io) {
        $is_windows = defined('PHP_WINDOWS_VERSION_BUILD');
        if ($is_windows) {
            // Handle escaping ourselves.
            $cmd = 'start "web" "' . $url . '""';
        }
        else {
            $url = escapeshellarg($url);
        }
        $is_linux = Process::fromShellCommandline('which xdg-open')->run();
        $is_osx = Process::fromShellCommandline('which open')->run();
        if ($is_linux === 0) {
            $cmd = 'xdg-open ' . $url;
        }
        elseif ($is_osx === 0) {
            $cmd = 'open ' . $url;
        }
        if (empty($cmd)) {
            $io->getErrorStyle()
                ->error('No suitable browser opening command found, open yourself: ' . $url);
            return;
        }
        if ($io->isVerbose()) {
            $io->writeln("<info>Browser command:</info> {$cmd}");
        }
        // Need to escape double quotes in the command so the PHP will work.
        $cmd = str_replace('"', '\\"', $cmd);
        // Sleep for 2 seconds before opening the browser. This allows the command
        // to start up the PHP built-in webserver in the meantime. We use a
        // PhpProcess so that Windows powershell users also get a browser opened
        // for them.
        $php = "<?php sleep(2); passthru(\"{$cmd}\"); ?>";
        $process = new PhpProcess($php);
        $process->start();
    }
    
    /**
     * Gets a one time login URL for user 1.
     *
     * @return string
     *   The one time login URL for user 1.
     */
    protected function getOneTimeLoginUrl() {
        $user = User::load(1);
        \Drupal::moduleHandler()->load('user');
        return user_pass_reset_url($user);
    }
    
    /**
     * Starts up a webserver with a running Drupal.
     *
     * @param string $host
     *   The hostname of the webserver.
     * @param int $port
     *   The port to start the webserver on.
     * @param \Drupal\Core\DrupalKernelInterface $kernel
     *   The Drupal kernel.
     * @param \Symfony\Component\Console\Input\InputInterface $input
     *   The input.
     * @param \Symfony\Component\Console\Style\SymfonyStyle $io
     *   The IO.
     *
     * @return int
     *   The exit status of the PHP in-built webserver command.
     */
    protected function start($host, $port, DrupalKernelInterface $kernel, InputInterface $input, SymfonyStyle $io) {
        $finder = new PhpExecutableFinder();
        $binary = $finder->find();
        if ($binary === FALSE) {
            throw new \RuntimeException('Unable to find the PHP binary.');
        }
        $io->writeln("<info>Drupal development server started:</info> <http://{$host}:{$port}>");
        $io->writeln('<info>This server is not meant for production use.</info>');
        $one_time_login = "http://{$host}:{$port}{$this->getOneTimeLoginUrl()}/login";
        $io->writeln("<info>One time login url:</info> <{$one_time_login}>");
        $io->writeln('Press Ctrl-C to quit the Drupal development server.');
        if (!$input->getOption('suppress-login')) {
            if ($this->openBrowser("{$one_time_login}?destination=" . urlencode("/"), $io) === 1) {
                $io->error('Error while opening up a one time login URL');
            }
        }
        // Use the Process object to construct an escaped command line.
        $process = new Process([
            $binary,
            '-S',
            $host . ':' . $port,
            '.ht.router.php',
        ], $kernel->getAppRoot(), [], NULL, NULL);
        if ($io->isVerbose()) {
            $io->writeln("<info>Server command:</info> {$process->getCommandLine()}");
        }
        // Carefully manage output so we can display output only in verbose mode.
        $descriptors = [];
        $descriptors[0] = STDIN;
        $descriptors[1] = [
            'pipe',
            'w',
        ];
        $descriptors[2] = [
            'pipe',
            'w',
        ];
        $server = proc_open($process->getCommandLine(), $descriptors, $pipes, $kernel->getAppRoot());
        if (is_resource($server)) {
            if ($io->isVerbose()) {
                // Write a blank line so that server output and the useful information are
                // visually separated.
                $io->writeln('');
            }
            $server_status = proc_get_status($server);
            while ($server_status['running']) {
                if ($io->isVerbose()) {
                    fpassthru($pipes[2]);
                }
                sleep(1);
                $server_status = proc_get_status($server);
            }
        }
        return proc_close($server);
    }
    
    /**
     * Gets the site path.
     *
     * Defaults to 'sites/default'. For testing purposes this can be overridden
     * using the DRUPAL_DEV_SITE_PATH environment variable.
     *
     * @return string
     *   The site path to use.
     */
    protected function getSitePath() {
        return getenv('DRUPAL_DEV_SITE_PATH') ?: 'sites/default';
    }

}