/*
Copyright (C) 2016 Anki Universal Team <ankiuniversal@outlook.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AnkiU.Anki
{
    public class ObservableCollectionAutoResize<T> : ObservableCollection<T>
    {
        public bool IsRemoveAtZero { get; set; } = false;

        public int MaxCollectionSize { get; set; }

        public ObservableCollectionAutoResize(int maxCollectionSize = 0) : base()
        {
            MaxCollectionSize = maxCollectionSize;
        }

        protected override void InsertItem(int index, T item)
        {
            base.InsertItem(index, item);

            if (MaxCollectionSize > 0 && MaxCollectionSize < Count)
            {
                int trimCount = Count - MaxCollectionSize;
                for (int i = 0; i < trimCount; i++)
                {
                    if (IsRemoveAtZero)
                        RemoveAt(0);
                    else
                        RemoveAt(Count - i - 1);
                }
            }
        }        
    }
}
