// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System;
using System.Diagnostics;
 
namespace Microsoft.Extensions.AI.Evaluation.NLP.Common;
 
[DebuggerDisplay("{ToDebugString(),nq}")]
internal readonly struct RationalNumber : IEquatable<RationalNumber>
{
    public static readonly RationalNumber Zero = new(0, 1);
 
    public RationalNumber(int numerator, int denominator)
    {
        if (denominator == 0)
        {
            throw new DivideByZeroException("Denominator cannot be zero.");
        }
 
        Numerator = numerator;
        Denominator = denominator;
    }
 
    public int Numerator { get; }
    public int Denominator { get; }
 
    public double ToDouble() => (double)Numerator / Denominator;
 
    public string ToDebugString() => $"{Numerator}/{Denominator}";
 
    public bool Equals(RationalNumber other)
        => other.Numerator == Numerator && other.Denominator == Denominator;
 
    public override bool Equals(object? obj) => obj is RationalNumber other && Equals(other);
 
    public override int GetHashCode()
        => HashCode.Combine(Numerator, Denominator);
}