// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

library http_server;

import 'dart:io';
import 'dart:isolate';
import 'dart:uri';
import 'test_suite.dart';  // For TestUtils.
// TODO(efortuna): Rewrite to not use the args library and simply take an
// expected number of arguments, so test.dart doesn't rely on the args library?
// See discussion on https://codereview.chromium.org/11931025/.
import 'vendored_pkg/args/args.dart';

main() {
  /** Convenience method for local testing. */
  var parser = new ArgParser();
  parser.addOption('port', abbr: 'p',
      help: 'The main server port we wish to respond to requests.',
      defaultsTo: '0');
  parser.addOption('crossOriginPort', abbr: 'c',
      help: 'A different port that accepts request from the main server port.',
      defaultsTo: '0');
  parser.addOption('mode', abbr: 'm', help: 'Testing mode.',
      defaultsTo: 'release');
  parser.addOption('arch', abbr: 'a', help: 'Testing architecture.',
      defaultsTo: 'ia32');
  parser.addFlag('help', abbr: 'h', negatable: false,
      help: 'Print this usage information.');
  parser.addOption('package-root', help: 'The package root to use.');
  parser.addOption('network', help: 'The network interface to use.',
      defaultsTo: '127.0.0.1');
  var args = parser.parse(new Options().arguments);
  if (args['help']) {
    print(parser.getUsage());
  } else {
    // Pretend we're running test.dart so that TestUtils doesn't get confused
    // about the "current directory." This is only used if we're trying to run
    // this file independently for local testing.
    TestUtils.testScriptPath = new Path(new Options().script)
        .directoryPath
        .join(new Path('../../test.dart'))
        .canonicalize()
        .toNativePath();
    TestingServerRunner._packageRootDir = new Path(args['package-root']);
    var network = args['network'];
    TestingServerRunner.startHttpServer(network,
        port: int.parse(args['port']));
    print('Server listening on port '
          '${TestingServerRunner.serverList[0].port}.');
    TestingServerRunner.startHttpServer(network,
        allowedPort: TestingServerRunner.serverList[0].port, port:
        int.parse(args['crossOriginPort']));
    print(
        'Server listening on port ${TestingServerRunner.serverList[1].port}.');
  }
}
/**
 * Runs a set of servers that are initialized specifically for the needs of our
 * test framework, such as dealing with package-root.
 */
class TestingServerRunner {
  static List serverList = [];
  static Path _packageRootDir = null;

  // Added as a getter so that the function will be called again each time the
  // default request handler closure is executed.
  static Path get packageRootDir => _packageRootDir;

  static setPackageRootDir(Map configuration) {
    _packageRootDir = TestUtils.currentWorkingDirectory.join(
        new Path(TestUtils.buildDir(configuration)));
  }

  static startHttpServer(String host, {int allowedPort:-1, int port: 0}) {
    var basePath = TestUtils.dartDir();
    var httpServer = new HttpServer();
    var packagesDirName = 'packages';
    httpServer.onError = (e) {
      // TODO(ricow): Once we have a debug log we should write this out there.
      print('Test http server error: $e');
    };
    httpServer.defaultRequestHandler = (request, resp) {
      var requestPath = new Path(request.path.substring(1)).canonicalize();
      var path = basePath.join(requestPath);
      var file = new File(path.toNativePath());

      if (requestPath.segments().contains(packagesDirName)) {
        // Essentially implement the packages path rewriting, so we don't have
        // to pass environment variables to the browsers.
        var requestPathStr = requestPath.toNativePath().substring(
            requestPath.toNativePath().indexOf(packagesDirName));
        path = packageRootDir.append(requestPathStr);
        file = new File(path.toNativePath());
      }
      file.exists().then((exists) {
        if (exists) {
          if (allowedPort != -1) {
            if (request.headers.value('Origin') != null) {
              var origin = new Uri(request.headers.value('Origin'));
              // Allow loading from http://*:$allowedPort in browsers.
              var allowedOrigin =
                  '${origin.scheme}://${origin.domain}:${allowedPort}';
              resp.headers.set("Access-Control-Allow-Origin", allowedOrigin);
              resp.headers.set('Access-Control-Allow-Credentials', 'true');
            }
          } else {
            // No allowedPort specified. Allow from anywhere (but cross-origin
            // requests *with credentials* will fail because you can't use "*").
            resp.headers.set("Access-Control-Allow-Origin", "*");
          }
          if (path.toNativePath().endsWith('.html')) {
            resp.headers.set('Content-Type', 'text/html');
          } else if (path.toNativePath().endsWith('.js')) {
            resp.headers.set('Content-Type', 'application/javascript');
          } else if (path.toNativePath().endsWith('.dart')) {
            resp.headers.set('Content-Type', 'application/dart');
          }
          file.openInputStream().pipe(resp.outputStream);
        } else {
          var directory = new Directory.fromPath(path);
          directory.exists().then((exists) {
            if (!exists) {
              sendNotFound(resp);
            } else {
              sendDirectoryListing(directory, request, resp);
            }
          });
        }
      });
    };

    // Echos back the contents of the request as the response data.
    httpServer.addRequestHandler((req) => req.path == "/echo", (request, resp) {
      resp.headers.set("Access-Control-Allow-Origin", "*");

      request.inputStream.pipe(resp.outputStream);
    });

    httpServer.listen(host, port);
    serverList.add(httpServer);
  }

  static void sendNotFound(HttpResponse response) {
    response.statusCode = HttpStatus.NOT_FOUND;
    try {
      response.outputStream.close();
    } catch (e) {
      if (e is StreamException) {
        print('Test http_server error closing the response stream: $e');
      } else {
        throw e;
      }
    }
  }

  /**
   * Sends a simple listing of all the files and sub-directories within
   * directory.
   *
   * This is intended to make it easier to browse tests when manually running
   * tests against this test server.
   */
  static void sendDirectoryListing(Directory directory, HttpRequest request,
      HttpResponse response) {
    response.headers.set('Content-Type', 'text/html');
    var header = '''<!DOCTYPE html>
    <html>
    <head>
      <title>${request.path}</title>
    </head>
    <body>
      <code>
        <div>${request.path}</div>
        <hr/>
        <ul>''';
    var footer = '''
        </ul>
      </code>
    </body>
    </html>''';

    var entries = [];

    directory.list()
      ..onFile = (filepath) {
        var filename = new Path(filepath).filename;
        entries.add(new _Entry(filename, filename));
      }
      ..onDir = (dirpath) {
        var filename = new Path(dirpath).filename;
        entries.add(new _Entry(filename, '$filename/'));
      }
      ..onDone = (_) {
        var requestPath = new Path.raw(request.path);
        entries.sort();

        response.outputStream.writeString(header);
        for (var entry in entries) {
          response.outputStream.writeString(
              '<li><a href="${requestPath.append(entry.name)}">'
              '${entry.displayName}</a></li>');
        }
        response.outputStream.writeString(footer);
        response.outputStream.close();
      };
  }

  static terminateHttpServers() {
    for (var server in serverList) server.close();
  }
}

// Helper class for displaying directory listings.
class _Entry {
  final String name;
  final String displayName;

  _Entry(this.name, this.displayName);

  int compareTo(_Entry other) {
    return name.compareTo(other.name);
  }
}