<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Joas Schilling <coding@schilljs.com>
 * @author Jörn Friedrich Dreyer <jfd@butonic.de>
 * @author Lukas Reschke <lukas@statuscode.ch>
 * @author Miha Frangez <miha.frangez@gmail.com>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author noveens <noveen.sachdeva@research.iiit.ac.in>
 * @author Robin Appelman <robin@icewind.nl>
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 * @author Victor Dubiniuk <dubiniuk@owncloud.com>
 *
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */
namespace OCA\OCCWeb\Controller;

//use OC\MemoryInfo;
use OC\NeedsUpdateException;
use OC_App;
use OCP\AppFramework\QueryException;
use OCP\Console\ConsoleEvent;
use OCP\IConfig;
use OCP\ILogger;
use Symfony\Component\Console\Application as SymfonyApplication;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\ConsoleOutputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;

class OCCApplication {
  /** @var IConfig */
  private $config;
  /** @var EventDispatcherInterface */
  private $dispatcher;
  /** @var ILogger  */
  private $logger;
//  /** @var MemoryInfo */
//  private $memoryInfo;

  /**
   * @param IConfig $config
   * @param EventDispatcherInterface $dispatcher
   * @param ILogger $logger
   * @param MemoryInfo $memoryInfo
   */
  public function __construct(IConfig $config,
                              EventDispatcherInterface $dispatcher,
                              ILogger $logger/*,
                              MemoryInfo $memoryInfo*/) {
    $defaults = \OC::$server->getThemingDefaults();
    $this->config = $config;
    $this->application = new SymfonyApplication($defaults->getName(), \OC_Util::getVersionString());
    $this->dispatcher = $dispatcher;
    $this->logger = $logger;
//    $this->memoryInfo = $memoryInfo;
  }

  /**
   * @param InputInterface $input
   * @param ConsoleOutputInterface $output
   * @throws \Exception
   */
  public function loadCommands(
    InputInterface $input,
    ConsoleOutputInterface $output
  ) {
    // $application is required to be defined in the register_command scripts
    $application = $this->application;
    $inputDefinition = $application->getDefinition();
    $inputDefinition->addOption(
      new InputOption(
        'no-warnings',
        null,
        InputOption::VALUE_NONE,
        'Skip global warnings, show command output only',
        null
      )
    );
    try {
      $input->bind($inputDefinition);
    } catch (\RuntimeException $e) {
      //expected if there are extra options
    }
    if ($input->getOption('no-warnings')) {
      $output->setVerbosity(OutputInterface::VERBOSITY_QUIET);
    }

//    if ($this->memoryInfo->isMemoryLimitSufficient() === false) {
//      $output->getErrorOutput()->writeln(
//        '<comment>The current PHP memory limit ' .
//        'is below the recommended value of 512MB.</comment>'
//      );
//    }

    try {
      require_once __DIR__ . '/../../../../core/register_command.php';
      if ($this->config->getSystemValue('installed', false)) {
        if (\OCP\Util::needUpgrade()) {
          throw new NeedsUpdateException();
        } elseif ($this->config->getSystemValue('maintenance', false)) {
          $this->writeMaintenanceModeInfo($input, $output);
        } else {
          OC_App::loadApps();
          foreach (\OC::$server->getAppManager()->getInstalledApps() as $app) {
            $appPath = \OC_App::getAppPath($app);
            if ($appPath === false) {
              continue;
            }
            // load commands using info.xml
            $info = \OC_App::getAppInfo($app);
            if (isset($info['commands'])) {
              $this->loadCommandsFromInfoXml($info['commands']);
            }
            // load from register_command.php
            \OC_App::registerAutoloading($app, $appPath);
            $file = $appPath . '/appinfo/register_command.php';
            if (file_exists($file)) {
              try {
                require $file;
              } catch (\Exception $e) {
                $this->logger->logException($e);
              }
            }
          }
        }
      } else if ($input->getArgument('command') !== '_completion' && $input->getArgument('command') !== 'maintenance:install') {
        $output->writeln("Nextcloud is not installed - only a limited number of commands are available");
      }
    } catch(NeedsUpdateException $e) {
      if ($input->getArgument('command') !== '_completion') {
        $output->writeln("Nextcloud or one of the apps require upgrade - only a limited number of commands are available");
        $output->writeln("You may use your browser or the occ upgrade command to do the upgrade");
      }
    }

    if ($input->getFirstArgument() !== 'check') {
      $errors = \OC_Util::checkServer(\OC::$server->getSystemConfig());
      if (!empty($errors)) {
        foreach ($errors as $error) {
          $output->writeln((string)$error['error']);
          $output->writeln((string)$error['hint']);
          $output->writeln('');
        }
        throw new \Exception("Environment not properly prepared.");
      }
    }
  }

  /**
   * Write a maintenance mode info.
   * The commands "_completion" and "maintenance:mode" are excluded.
   *
   * @param InputInterface $input The input implementation for reading inputs.
   * @param ConsoleOutputInterface $output The output implementation
   * for writing outputs.
   * @return void
   */
  private function writeMaintenanceModeInfo(
    InputInterface $input, ConsoleOutputInterface $output
  ) {
    if ($input->getArgument('command') !== '_completion'
      && $input->getArgument('command') !== 'maintenance:mode') {
      $errOutput = $output->getErrorOutput();
      $errOutput->writeln(
        '<comment>Nextcloud is in maintenance mode - ' .
        'no apps have been loaded</comment>' . PHP_EOL
      );
    }
  }

  /**
   * Sets whether to automatically exit after a command execution or not.
   *
   * @param bool $boolean Whether to automatically exit after a command execution or not
   */
  public function setAutoExit($boolean) {
    $this->application->setAutoExit($boolean);
  }

  /**
   * @param InputInterface $input
   * @param OutputInterface $output
   * @return int
   * @throws \Exception
   */
  public function run(InputInterface $input = null, OutputInterface $output = null) {
    $this->dispatcher->dispatch(ConsoleEvent::EVENT_RUN, new ConsoleEvent(
      ConsoleEvent::EVENT_RUN,
      ['occ']
    ));
    return $this->application->run($input, $output);
  }

  private function loadCommandsFromInfoXml($commands) {
    foreach ($commands as $command) {
      try {
        $c = \OC::$server->query($command);
      } catch (QueryException $e) {
        if (class_exists($command)) {
          $c = new $command();
        } else {
          throw new \Exception("Console command '$command' is unknown and could not be loaded");
        }
      }

      $this->application->add($c);
    }
  }
}