// 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> firstWhere (
///     bool test(T element), {
///     dynamic defaultValue(),
///     RawSocketEvent orElse()
/// })
/// Finds the first element of this stream matching test.
///
/// Returns a future that is completed with the first element of this stream that
/// test returns true for.
///
/// @description Checks that method [firstWhere] returns Future that is completed
/// with the first element of this stream that test returns true for.
/// @author ngl@unipro.ru

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

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

      Future fValue = receiver.firstWhere(test);
      fValue.then((value) {
        Expect.equals(expected, value);
      }).whenComplete(() {
        asyncEnd();
      });
    });
  });
}

main() {
  check((e) => e == RawSocketEvent.write, RawSocketEvent.write);
  check((e) => e == RawSocketEvent.read, RawSocketEvent.read);
  check((e) => e is RawSocketEvent, RawSocketEvent.write);
  check((e) => true, RawSocketEvent.write);
  check((e) => e != RawSocketEvent.write, RawSocketEvent.read);
}