using UnityEngine;
using System.Collections.Generic;
using System;
using System.Collections;
using System.Linq;

namespace JungleDB {
	public class DefaultTreeOperationLog : TreeOperationLog {
		private IEnumerable<TreeOperation> list;
		private int size;

		IEnumerator IEnumerable.GetEnumerator()
		{
			// call the generic version of the method
			return this.GetEnumerator();
		}

		public IEnumerator<TreeOperation> GetEnumerator()
		{
			foreach (var i in list) {
				yield return i;
			}
		}


		public DefaultTreeOperationLog()
		{
			list = new List<TreeOperation>();
			size = 0;
		}

		public DefaultTreeOperationLog(IEnumerable<TreeOperation> _list,int _size)
		{
			list = _list;
			size = _size;
		}

	//	public IEnumerator<TreeOperation> iterator()
	//	{
	//		return list.itetator();
	//	}

		public TreeOperationLog add(NodePath _p, NodeOperation _op)
		{
			TreeOperation op = new DefaultTreeOperation(_p,_op);
			List<TreeOperation> newList =  new List<TreeOperation>(op);
			// java write Iterables.concat ここは間違い
			IEnumerable<TreeOperation> concat = list.Union<TreeOperation>(newList);

			return new DefaultTreeOperationLog(concat,size + 1);
		}

		public TreeOperationLog append(TreeOperationLog _log)
		{
			int argumentLogSize = _log.length();
			// java write Iterables.concat
			IEnumerable<TreeOperation> concat = list.Union<TreeOperation>(_log);

			return new DefaultTreeOperationLog(concat,argumentLogSize + size);
		}


		public int length(){
			return size;
		}
	}
}