// Copyright (c) 2018, 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.

// @dart = 2.9

/// @assertion
/// Future<RawSocketEvent> reduce(
///     RawSocketEvent combine(T previous, T element)
/// )
/// Combines a sequence of values by repeatedly applying combine.
///
/// @description Checks that method [reduce] reduces a sequence of values
/// according to method combine.
/// @author ngl@unipro.ru

import "dart:io";
import "dart:async";
import "../../../Utils/expect.dart";

check(combine(previous, element), expected) {
  asyncStart();
  var address = InternetAddress.loopbackIPv4;
  RawDatagramSocket.bind(address, 0).then((producer) {
    RawDatagramSocket.bind(address, 0).then((receiver) {
      int sent = 0;
      int counter = 0;
      producer.send([sent++], address, receiver.port);
      producer.send([sent++], address, receiver.port);
      producer.close();

      Stream bcs = receiver.asBroadcastStream();
      Future future = bcs.reduce(combine);
      future.then((event) {
        Expect.equals(expected, event);
      }).whenComplete(() {
        asyncEnd();
      });

      bcs.listen((event) {
        receiver.receive();
        counter++;
      }).onDone(() {
        Expect.equals(3, counter);
      });

      new Timer(const Duration(milliseconds: 200), () {
        Expect.isNull(receiver.receive());
        receiver.close();
      });
    });
  });
}

main() {
  check((previous, element) => previous, RawSocketEvent.write);
  check((previous, element) => element, RawSocketEvent.closed);
}