#nullable disable
﻿namespace Terminal.Gui.Views;

/// <summary>
///     Interface to implement when you want the regular (non-generic) <see cref="TreeView"/> to automatically
///     determine children for your class (without having to specify an <see cref="ITreeBuilder{T}"/>)
/// </summary>
public interface ITreeNode
{
    /// <summary>The children of your class which should be rendered underneath it when expanded</summary>
    /// <value></value>
    IList<ITreeNode> Children { get; }

    /// <summary>Optionally allows you to store some custom data/class here.</summary>
    object Tag { get; set; }

    /// <summary>Text to display when rendering the node</summary>
    string Text { get; set; }
}

/// <summary>Simple class for representing nodes, use with regular (non-generic) <see cref="TreeView"/>.</summary>
public class TreeNode : ITreeNode
{
    /// <summary>Initialises a new instance with no <see cref="Text"/></summary>
    public TreeNode () { }

    /// <summary>Initialises a new instance and sets starting <see cref="Text"/></summary>
    public TreeNode (string text) { Text = text; }

    /// <summary>Children of the current node</summary>
    /// <returns></returns>
    public virtual IList<ITreeNode> Children { get; set; } = new List<ITreeNode> ();

    /// <summary>Text to display in tree node for current entry</summary>
    /// <value></value>
    public virtual string Text { get; set; }

    /// <summary>Optionally allows you to store some custom data/class here.</summary>
    public object Tag { get; set; }

    /// <summary>returns <see cref="Text"/></summary>
    /// <returns></returns>
    public override string ToString () { return Text ?? "Unnamed Node"; }
}
