// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:io';

import 'package:args/args.dart';
import 'package:shelf/shelf.dart';
import 'package:shelf/shelf_io.dart' as io;
import 'package:shelf_route/shelf_route.dart' as shelf_route;
import 'package:shelf_static/shelf_static.dart';

void printUsage(parser) {
  print('Usage: sky_server [-v] PORT');
  print(parser.usage);
}

void addRoute(var router, String route, String path) {
  router.add(
    route,
    ['GET', 'HEAD'],
    createStaticHandler(
      path,
      serveFilesOutsidePath: true,
      listDirectories: true
    ), exactMatch: false
  );
}

main(List<String> argv) async {
  ArgParser parser = new ArgParser();
  parser.addFlag('help', abbr: 'h', negatable: false,
                 help: 'Display this help message.');
  parser.addFlag('verbose', abbr: 'v', negatable: false,
                 help: 'Log requests to stdout.');
  parser.addOption('route', allowMultiple: true, splitCommas: false,
                   help: 'Adds a virtual directory to the root.');

  ArgResults args = parser.parse(argv);

  if (args['help'] || args.rest.length != 1) {
    printUsage(parser);
    return;
  }

  int port;
  try {
    port = int.parse(args.rest[0]);
  } catch(e) {
    printUsage(parser);
    return;
  }

  var router = shelf_route.router();

  if (args['route'] != null) {
    for (String arg in args['route']) {
      List<String> parsedArgs = arg.split(',');
      addRoute(router, parsedArgs[0], parsedArgs[1]);
    }
  }

  addRoute(router, '/', Directory.current.path);

  var handler = router.handler;

  if (args['verbose'])
    handler = const Pipeline().addMiddleware(logRequests()).addHandler(handler);

  HttpServer server;
  try {
    server = await io.serve(handler, InternetAddress.LOOPBACK_IP_V4, port);
    print('Serving ${Directory.current.absolute.path} from '
        'http://${server.address.address}:${server.port}.');
  } catch(e) {
    print(e);
    exit(1);
  }

  server.defaultResponseHeaders
    ..removeAll('x-content-type-options')
    ..removeAll('x-frame-options')
    ..removeAll('x-xss-protection')
    ..add('cache-control', 'no-store');
}