//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
//     file="SizeFixedList.cs"
//     Project: StgSharp
//     AuthorGroup: Nitload Space
//     Copyright (c) Nitload Space. All rights reserved.
//     
//     Permission is hereby granted, free of charge, to any person 
//     obtaining a copy of this software and associated documentation 
//     files (the “Software”), to deal in the Software without restriction, 
//     including without limitation the rights to use, copy, modify, merge,
//     publish, distribute, sublicense, and/or sell copies of the Software, 
//     and to permit persons to whom the Software is furnished to do so, 
//     subject to the following conditions:
//     
//     The above copyright notice and 
//     this permission notice shall be included in all copies 
//     or substantial portions of the Software.
//     
//     THE SOFTWARE IS PROVIDED “AS IS”, 
//     WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
//     INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
//     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
//     IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
//     DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
//     ARISING FROM, OUT OF OR IN CONNECTION WITH 
//     THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//     
//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using System.Text;

namespace StgSharp.Collections
{
    internal class SizeFixedList<T> : IList<T>
    {

        private T[] values;
        private int capacity, _index;

        public SizeFixedList(int size)
        {
            values = new T[size];
        }

        public T this[int index]
        {
            get => (index < _index) ? values[index] : throw new ArgumentOutOfRangeException(nameof(index));
            set
            {
                if (index < _index)
                {
                    values[index] = value;
                }
                else
                {
                    throw new ArgumentOutOfRangeException(nameof(index));
                }
            }
        }

        public bool IsReadOnly => false;

        public int Count => _index + 1;

        public void Add(T item)
        {
            if (_index < capacity - 1)
            {
                _index++;
                this[_index] = item;
            }
        }

        public void Clear()
        {
            values = new T[capacity];
            _index = 0;
        }

        public bool Contains(T item)
        {
            for (int i = 0; i <= _index; i++)
            {
                if (item.Equals(values[i]))
                {
                    return true;
                }
            }
            return false;
        }

        public void CopyTo(T[] array, int arrayIndex)
        {
            throw new NotImplementedException();
        }

        public IEnumerator<T> GetEnumerator()
        {
            for (int i = 0; i <= _index; i++)
            {
                yield return values[i];
            }
        }

        public int IndexOf(T item)
        {
            for (int i = 0; i <= _index; i++)
            {
                if (values[i].Equals(item))
                {
                    return i;
                }
            }
            return -1;
        }

        void IList<T>.Insert(int index, T item)
        {
            throw new NotSupportedException();
        }
    
        public bool Remove(T item)
        {

            for (int i = 0; i <= _index; i++)
            {
                if (values[i].Equals(item))
                {
                    values[i] = values[_index];
                    _index--;
                    return true;
                }
            }
            return false;
        }

        public void RemoveAll(Predicate<T> predicate)
        {
            for (int i = _index; i > 0; i--)
            {
                if (predicate(values[i]))
                {
                    values[i] = values[_index];
                    _index--;
                }
            }
        }

        public void RemoveAt(int index)
        {
            if (index <= _index)
            {
                values[index] = values[_index];
                _index--;
            }
        }

        public void Resize(int newSize)
        {
            Array.Resize(ref values, newSize);
        }

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

    }//------------------------------------- End of Class ------------------------------------------
}