// Copyright (c) 2011, 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.

/// @assertion static void approxEquals(num expected, num actual,
///   [num tolerance = null, String reason = null])
/// If no tolerance is given, tolerance is assumed to be the value 4 significant
/// digits smaller than the value given for expected.
/// @description Checks that with no tolerance specified, it is indeed assumed
/// to be 1/10000th of [expected].
/// Zeros and infinities of both signs are tested.
/// @author rodionov

import "../../../Utils/expect.dart";

import "dart:math" as Math;

main() {
  final double MIN_DOUBLE = Math.pow(2.0, -1074) as double;
  final double NEG_MIN_DOUBLE = -1 * MIN_DOUBLE; 
  final double MAX_DOUBLE =
      (2 - Math.pow(2.0, -52)) * Math.pow(2.0, 1023) as double;
  final double NEG_MAX_DOUBLE = -1 * MAX_DOUBLE; 

  Expect.approxEquals(0, 0);
  Expect.approxEquals(0, 0, null, "");
  Expect.approxEquals(0, 0, null, "not empty");

  Expect.approxEquals(-0.0, 0);
  Expect.approxEquals(-0.0, 0, null, "");
  Expect.approxEquals(-0.0, 0, null, "not empty");

  Expect.approxEquals(10000, 10001);
  Expect.approxEquals(10000, 10001, null, "");
  Expect.approxEquals(10000, 10001, null, "not empty");

  Expect.approxEquals(-10001, -10002);
  Expect.approxEquals(-10001, -10002, null, "");
  Expect.approxEquals(-10001, -10002, null, "not empty");

  check(100, 101);
  check(100, 101, "");
  check(100, 101, "not empty");

  // min double > 0 / 10000
  check(0, MIN_DOUBLE);
  check(0, MIN_DOUBLE, "");
  check(0, MIN_DOUBLE, "not empty");

  check(0, NEG_MIN_DOUBLE);
  check(0, NEG_MIN_DOUBLE, "");
  check(0, NEG_MIN_DOUBLE, "not empty");

  // inf / 10000 -> inf
  Expect.approxEquals(double.infinity, 0);
  Expect.approxEquals(double.infinity, 0, null, "");
  Expect.approxEquals(double.infinity, 0, null, "not empty");

  Expect.approxEquals(double.negativeInfinity, 0);
  Expect.approxEquals(double.negativeInfinity, 0, null, "");
  Expect.approxEquals(double.negativeInfinity, 0, null, "not empty");
}

void check(num arg1, num arg2, [String reason = '']) {
  try {
    Expect.approxEquals(arg1, arg2, null, reason);
    throw new Exception("ExpectException expected");
  } on ExpectException catch(e) {
  }
}