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


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;
	}
}