// 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 num remainder(num other)
/// Returns the remainder of the truncating division of this by other.
///
/// The result r of this operation satisfies: this == (this ~/ other) * other + r.
/// As a consequence the remainder r has the same sign as the divider this.
/// @author vasya

import "../../../Utils/expect.dart";
import "dart:math" as Math;

main() {
  check(0.0, 1, 0.5);
  check(0.0, 1, -0.5);

  check(0.25, 1, 0.375);
  check(0.25, 1, -0.375);
  check(-0.25, -1, 0.375);
  check(-0.25, -1, -0.375);

  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; 

  check(0, 0, MIN_DOUBLE);
  check(0, 0, NEG_MIN_DOUBLE);
  check(0, 0, MAX_DOUBLE);
  check(0, 0, NEG_MAX_DOUBLE);
  check(1, 1, MAX_DOUBLE);
  check(1, 1, NEG_MAX_DOUBLE);
  check(1, 1, double.infinity);
  check(-1, -1, double.infinity);
  check(1, 1, double.negativeInfinity);
  check(-1, -1, double.negativeInfinity);
  check(0x1000000000000000, 0x1000000000000000, double.infinity);
  check(-0x1000000000000000, -0x1000000000000000, double.infinity);
  check(0x1000000000000000, 0x1000000000000000, double.negativeInfinity);
  check(-0x1000000000000000, -0x1000000000000000, double.negativeInfinity);
  
  Expect.isTrue((1.remainder(0.0)).isNaN);
  Expect.isTrue((1.remainder(-0.0)).isNaN);
  Expect.isTrue((-1.remainder(0.0)).isNaN);
  Expect.isTrue((-1.remainder(-0.0)).isNaN);
  Expect.isTrue((0.remainder(0.0)).isNaN);
  Expect.isTrue((0.remainder(-0.0)).isNaN);
  Expect.isTrue((0x1000000000000000.remainder(0.0)).isNaN);
  Expect.isTrue(((-0x1000000000000000).remainder(0.0)).isNaN);
  Expect.isTrue((1.remainder(double.nan)).isNaN);
  Expect.isTrue((0x1000000000000000.remainder(double.nan)).isNaN);
  Expect.isTrue(((-0x1000000000000000).remainder(double.nan)).isNaN);
}

void check(num ex, int a, double b) {
  Expect.equals(ex, a.remainder(b));
  Expect.isTrue(a.remainder(b) is double);
  Expect.runtimeIsType<double>(a.remainder(b));
}