// 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.
 
#nullable disable
 
using System.Diagnostics;
 
namespace Microsoft.CodeAnalysis.Differencing.UnitTests;
 
public sealed class TestNode
{
    public const int MaxValue = 10;
    public const int MaxLabel = 1;
 
    public readonly int Label;
    public readonly int Value;
    public readonly TestNode[] Children;
    public TestNode Parent;
 
    private TestNode _lazyRoot;
 
    public TestNode(int label, int value, params TestNode[] children)
    {
        Debug.Assert(value is >= 0 and <= MaxValue);
        Debug.Assert(label is >= 0 and <= MaxLabel);
 
        this.Label = label;
        this.Value = value;
        this.Children = children;
 
        foreach (var child in children)
        {
            child.Parent = this;
        }
    }
 
    public TestNode Root
    {
        get
        {
            _lazyRoot ??= this.Parent == null ? this : this.Parent.Root;
 
            return _lazyRoot;
        }
    }
 
    public override string ToString()
        => string.Format("({0}, {1})", Label, Value);
}