using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms.VisualStyles;
using WarmlyLocomotive.Exceptions;
using System;
using System.Numerics;

namespace WarmlyLocomotive.Generics

{
    internal class SetGeneric<T>
        where T : class
    {
        private readonly List<T?> _places;
        public int Count => _places.Count;
        //public int startPointer = 0;

        public int countMax = 0;
        public SetGeneric(int count)
        {
            _places = new List<T?>(count);
            countMax = count;
        }
        public bool Insert(T ship, IEqualityComparer<T>? equal = null)
        {
            if (_places.Count == countMax)
                throw new StorageOverflowException(countMax);
            Insert(ship, 0, equal);
            return true;
        }
        public void Insert(T ship, int position, IEqualityComparer<T>? equal = null)
        {
            if (_places.Count == countMax)
                throw new StorageOverflowException(countMax);
            if (!(position >= 0 && position <= Count))
                throw new Exception($"Неверная позиция для вставки");
            if (equal != null)
            {
                if (_places.Contains(ship, equal))
                    throw new ArgumentException(nameof(ship));
            }
            _places.Insert(position, ship);
        }
        public void SortSet(IComparer<T?> comparer) => _places.Sort(comparer);
        public void Remove(int position)
        {
            if (!(position >= 0 && position < Count))
                throw new WarmlyLocomotiveNotFoundException(position);
            _places.RemoveAt(position);
        }
        public T? this[int position]
        {
            get
            {
                if (!(position >= 0 && position < Count))
                    return null;
                return _places[position];
            }
            set
            {
                if (!(position >= 0 && position < Count && _places.Count < countMax))
                    return;
                _places.Insert(position, value);
                return;
            }
        }
        public IEnumerable<T?> GetWarmlyLocomotive(int? maxShip = null)
        {
            for (int i = 0; i < _places.Count; ++i)
            {
                yield return _places[i];
                if (maxShip.HasValue && i == maxShip.Value)
                {
                    yield break;
                }
            }
        }
    }
}