using System.Collections;
using System.Collections.Generic;

namespace AssetRipper.MeshSharp.FBX
{
	/// <summary>
	/// Base class for nodes and documents
	/// </summary>
	public abstract class FbxNodeCollection : IEnumerable<FbxNode>
	{
		/// <summary>
		/// The list of child/nested nodes
		/// </summary>
		/// <remarks>
		/// A list with one or more null elements is treated differently than an empty list,
		/// and represented differently in all FBX output files.
		/// </remarks>
		public List<FbxNode> Nodes { get; } = new List<FbxNode>();

		/// <summary>
		/// Gets a named child node
		/// </summary>
		/// <param name="name"></param>
		/// <returns>The child node, or null</returns>
		public FbxNode this[string name] { get { return Nodes.Find(n => n != null && n.Name == name); } }

		/// <summary>
		/// Gets a child node, using a '/' separated path
		/// </summary>
		/// <param name="path"></param>
		/// <returns>The child node, or null</returns>
		public FbxNode GetRelative(string path)
		{
			string[] tokens = path.Split('/');
			FbxNodeCollection n = this;
			foreach (var t in tokens)
			{
				if (t == "")
					continue;
				n = n[t];
				if (n == null)
					break;
			}
			return n as FbxNode;
		}

		public IEnumerator<FbxNode> GetEnumerator()
		{
			return Nodes.GetEnumerator();
		}

		IEnumerator IEnumerable.GetEnumerator()
		{
			return Nodes.GetEnumerator();
		}
	}
}