// 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 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);
    }
}