PIbd-14_Pruidze_I.K_Simple_Cruiser/ProjectCruiser/CollectionGenericObj/ArrayGenObj.cs


namespace ProjectCruiser.CollectionGenericObj;

public class ArrayGenObj<T> : ICollectionGenObj<T>
    where T : class
{
    // Массив объектов, которые храним
    private T?[] _collection;
    public int Count => _collection.Length;
    public int MaxCount
    {
        get { return _collection.Length; }
        set
        {
            if (value > 0)
            {
                if (_collection.Length > 0) Array.Resize(ref _collection, value);
                else _collection = new T?[value];
            }
        }
    }

    public CollectionType GetCollectionType => CollectionType.Array;

    public ArrayGenObj()
    {
        _collection = Array.Empty<T?>();
    }

    // methods :

    public T? GetItem(int index)
    {
        if (index > Count || index < 0)
        {
            return null;
        }
        return _collection[index];
    }

    public int Insert(T? item)
    {
        // any empty place
        for (int i = 0; i < Count; i++)
        {
            if (_collection[i] == null)
            {
                _collection[i] = item;
                return i;
            }
        }
        return -1;
    }

    public int Insert(T? item, int index)
    {
        if (_collection[index] == null)
        {
            _collection[index] = item;
            return index;
        }

        else
        {
            int min_diff = 100, min_index = 100;

            for (int i = 0; i < Count; i++)
            {
                if (_collection[i] == null
                    && min_diff > Math.Abs(index - i))
                {
                    min_diff = Math.Abs(index - i);
                    min_index = i;
                }
            }

            _collection[min_index] = item;
            return min_index;
        }

        return -1;
    }

    public T? Remove(int index)
    {
        T? item;
        if (index < Count && index >= 0)
        {
            item = _collection[index];
            _collection[index] = null;
            return item;
        }
        return null;
    }

    public IEnumerable<T?> GetItems()
    {
        for (int i = 0; i < _collection.Length; ++i)
        { 
            yield return _collection[i];
        }
    }
}