//============= Copyright (c) Ludic GmbH, All rights reserved. ==============
//
// Purpose: Part of the My Behaviour Tree Code
//
//=============================================================================

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

namespace MyBT {
    [System.Serializable]
    public class NodeList : IEnumerator, IEnumerable {
        [SerializeField]
        List<Node> array = new List<Node>();

        public NodeList(List<Node> nArray) {
            for (int i = 0; i < nArray.Count; i++) {
                array.Add(nArray[i]);
            }
        }
        public NodeList() { }

        public Node this[int param] {
            get {
                if ((param < array.Count) && (param >= 0))
                    return array[param];
                Debug.LogError($"TaskController.this: invalid index {param.ToString()} in {((array != null) ? array.Count.ToString() : "undefined")}");
                return null;
            }
            set { array[param] = value; }
        }

        public int Count {
            get {
                return array.Count;
            }
        }

        public void Add(Node t) {
            array.Add(t);
        }

        int position = -1;
        public bool MoveNext() {
            position++;
            return (position < array.Count);
        }

        public void Reset() {
            position = -1;
        }

        public void Clear() {
            Destroy();
        }

        public void Destroy() {
            array = new List<Node>();
            Reset();
        }

        object IEnumerator.Current {
            get {
                return Current;
            }
        }

        public Node Current {
            get {
                try {
                    return array[position];
                }
                catch (IndexOutOfRangeException) {
                    throw new InvalidOperationException();
                }
            }
        }

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

        public NodeList GetEnumerator() {
            return new NodeList(array);
        }

        public NodeList Copy() {
            List<Node> newArray = new List<Node>();

            ExtensionMethods.DeepCopy<List<Node>>(array, ref newArray);

            return new NodeList(newArray);
        }
    }

}