<?php

namespace BitGoblin\MCST\Controllers;

use DiDom\Document;
use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
use Slim\Views\Twig;

use BitGoblin\MCST\Minecraft\Server;

class ServerController extends Controller {

  // GET create server route
  public function getCreate(Request $request, Response $response, $args): Response {
    $view = Twig::fromRequest($request);
    return $view->render($response, 'create.twig');
  }

  // POST create server route
  public function postCreate(Request $request, Response $response, $args): Response {
    // set up the POST parameters and grab our config
    $params = (array)$request->getParsedBody();
    $config = $this->get('config');

    // create our server directory
    $serverDir = join('/', array($config->get('server_directory'), $params['serverName']));
    mkdir($serverDir);

    // find the server JAR URL for the version
    $versionPageLink = 'https://minecraft.fandom.com/wiki/Java_Edition_' . $params['serverVersion'];
    $dom = new Document($versionPageLink, true);
    $infobox = $dom->find('.notaninfobox')[0];
    $serverLinkElem = $infobox->find("a:contains('Server')");
    $serverJarUrl = $serverLinkElem[0]->attr('href');

    // grab the server JAR file
    $serverJarName = "server_" . $params['serverVersion'] . ".jar";
    $serverJarPath = join('/', array($serverDir, $serverJarName));
    file_put_contents($serverJarPath, file_get_contents($serverJarUrl));

    // create the start.sh shell script
    $scriptFilePath = join('/', array($serverDir, 'start.sh'));
    $scriptFile = fopen($scriptFilePath, 'w');
    $scriptContent = "#!/bin/sh\n\ncd " . $serverDir . "\njava -Xmx2048M -Xms2048M -jar server_" . $params['serverVersion'] . ".jar nogui";
    fwrite($scriptFile, $scriptContent);
    fclose($scriptFile);
    chmod($scriptFilePath, 0755);

    // save the current version to a text file - this will hopefully be temporary solution
    $versionFilePath = join('/', array($serverDir, 'current_version.txt'));
    $versionFile = fopen($versionFilePath, 'w');
    $versionContent = $params['serverVersion'];
    fwrite($versionFile, $versionContent);
    fclose($versionFile);
    chmod($versionFilePath, 0644);

    // redirect the user back to the home page
    return $response
      ->withHeader('Location', '/')
      ->withStatus(302);
  }

  // GET server status route
  public function getStatus(Request $request, Response $response, $args): Response {
    $config = $this->get('config');
    $serverDir = join('/', array($config->get('server_directory'), $args['serverName']));

    // check if the server exists - if not, return a false result
    if (!is_dir($serverDir)) {
      $response->getBody()->write(json_encode(array('exists' => false)));
      return $response
        ->withHeader('Content-Type', 'application/json');
    }

    // create server object and pass info back to client as JSON data
    $server = new Server($serverDir);
    $serverData = [
      'exists'  => true,
      'name'    => $server->getName(),
      'version' => $server->getVersion(),
      'state'   => $server->getState() ? 'Running' : 'Stopped',
    ];

    $response->getBody()->write(json_encode($serverData));
    return $response
      ->withHeader('Content-Type', 'application/json');
  }

  // GET server start route
  public function getStart(Request $request, Response $response, $args): Response {
    $config = $this->get('config');
    $serverDir = join('/', array($config->get('server_directory'), $args['serverName']));

    // create server object and start it
    $server = new Server($serverDir);
    $server->start();

    // redirect the user back to the home page
    return $response
      ->withHeader('Location', '/')
      ->withStatus(302);
  }

  // GET server stop route
  public function getStop(Request $request, Response $response, $args): Response {
    $config = $this->get('config');
    $serverDir = join('/', array($config->get('server_directory'), $args['serverName']));

    // create server object and start it
    $server = new Server($serverDir);
    $server->stop();

    // redirect the user back to the home page
    return $response
      ->withHeader('Location', '/')
      ->withStatus(302);
  }

}