// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

#nullable disable

using System;
using System.Globalization;
using Microsoft.Extensions.Internal;

namespace Microsoft.AspNetCore.Razor.Language;

public sealed class SourceMapping : IEquatable<SourceMapping>
{
    public SourceMapping(SourceSpan originalSpan, SourceSpan generatedSpan)
    {
        OriginalSpan = originalSpan;
        GeneratedSpan = generatedSpan;
    }

    public SourceSpan OriginalSpan { get; }

    public SourceSpan GeneratedSpan { get; }

    public override bool Equals(object obj)
    {
        var other = obj as SourceMapping;
        return Equals(other);
    }

    public bool Equals(SourceMapping other)
    {
        if (ReferenceEquals(other, null))
        {
            return false;
        }

        return OriginalSpan.Equals(other.OriginalSpan) &&
            GeneratedSpan.Equals(other.GeneratedSpan);
    }

    public override int GetHashCode()
    {
        var hashCodeCombiner = HashCodeCombiner.Start();
        hashCodeCombiner.Add(OriginalSpan);
        hashCodeCombiner.Add(GeneratedSpan);

        return hashCodeCombiner;
    }

    public override string ToString()
    {
        return string.Format(CultureInfo.CurrentCulture, "{0} -> {1}", OriginalSpan, GeneratedSpan);
    }
}