// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
namespace Microsoft.CodeAnalysis.Formatting;
 
internal readonly struct LineColumnDelta(int lines, int spaces)
{
    public static LineColumnDelta Default = new(lines: 0, spaces: 0, whitespaceOnly: true, forceUpdate: false);
 
    /// <summary>
    /// relative line number between calls
    /// </summary>
    public readonly int Lines = lines;
 
    /// <summary>
    /// relative spaces between calls
    /// </summary>
    public readonly int Spaces = spaces;
 
    /// <summary>
    /// there is only whitespace in this space
    /// </summary>
    public readonly bool WhitespaceOnly = true;
 
    /// <summary>
    /// force text change regardless line and space changes
    /// </summary>
    public readonly bool ForceUpdate = false;
 
    public LineColumnDelta(int lines, int spaces, bool whitespaceOnly)
        : this(lines, spaces)
    {
        this.WhitespaceOnly = whitespaceOnly;
        this.ForceUpdate = false;
    }
 
    public LineColumnDelta(int lines, int spaces, bool whitespaceOnly, bool forceUpdate)
        : this(lines, spaces, whitespaceOnly)
    {
        this.ForceUpdate = forceUpdate;
    }
 
    internal LineColumnDelta With(LineColumnDelta delta)
    {
        if (delta.Lines <= 0)
        {
            return new LineColumnDelta(
                Lines,
                Spaces + delta.Spaces,
                WhitespaceOnly && delta.WhitespaceOnly,
                ForceUpdate || delta.ForceUpdate);
        }
 
        return new LineColumnDelta(
            Lines + delta.Lines,
            delta.Spaces,
            delta.WhitespaceOnly,
            ForceUpdate || delta.ForceUpdate || Spaces > 0);
    }
}