/***************************************************************************
 *                               Point3DList.cs
 *                            -------------------
 *   begin                : May 1, 2002
 *   copyright            : (C) The RunUO Software Team
 *   email                : info@runuo.com
 *
 *   $Id$
 *
 ***************************************************************************/

/***************************************************************************
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 ***************************************************************************/

using System;

namespace Server
{
    public class Point3DList
    {
        private static readonly Point3D[] m_EmptyList = Array.Empty<Point3D>();
        private Point3D[] m_List;

        public Point3DList()
        {
            m_List = new Point3D[8];
            Count = 0;
        }

        public int Count { get; private set; }

        public Point3D Last => m_List[Count - 1];

        public Point3D this[int index] => m_List[index];

        public void Clear()
        {
            Count = 0;
        }

        public void Add(int x, int y, int z)
        {
            if (Count + 1 > m_List.Length)
            {
                var old = m_List;
                m_List = new Point3D[old.Length * 2];

                for (var i = 0; i < old.Length; ++i)
                    m_List[i] = old[i];
            }

            m_List[Count].m_X = x;
            m_List[Count].m_Y = y;
            m_List[Count].m_Z = z;
            ++Count;
        }

        public void Add(Point3D p)
        {
            if (Count + 1 > m_List.Length)
            {
                var old = m_List;
                m_List = new Point3D[old.Length * 2];

                for (var i = 0; i < old.Length; ++i)
                    m_List[i] = old[i];
            }

            m_List[Count].m_X = p.m_X;
            m_List[Count].m_Y = p.m_Y;
            m_List[Count].m_Z = p.m_Z;
            ++Count;
        }

        public Point3D[] ToArray()
        {
            if (Count == 0)
                return m_EmptyList;

            var list = new Point3D[Count];

            for (var i = 0; i < Count; ++i)
                list[i] = m_List[i];

            Count = 0;

            return list;
        }
    }
}