Bucket/Buckets.Logic/Container.cs

namespace Buckets.Logic
{
    public abstract class Container
    {
        private int content;

        public delegate void FullEventHandler(Container container, EventArgs eventArgs);
        public delegate void OverflowEventHandler(Container container, OverflowEventArgs eventArgs);
        public event FullEventHandler? Full;
        public event OverflowEventHandler? Overflowed;

        public int Capacity { get; }
        public int Content
        {
            get => content;
            set 
            {
                ArgumentOutOfRangeException.ThrowIfNegative(value, nameof(Content));
                if (value == Capacity)
                {
                    Full?.Invoke(this, new());
                }
                else if (value > Capacity)
                {
                    Overflowed?.Invoke(this, new(value - Capacity));
                }
                content = Math.Min(value, Capacity);
            }
        }

        public Container(int capacity, int content)
        {
            ArgumentOutOfRangeException.ThrowIfNegative(capacity, nameof(Capacity));
            Capacity = capacity;
            Content = content;
        }

        public void Fill(int amount)
        {
            Content += amount;
        }

        public void Empty(int amount)
        {
            Content -= amount;
        }

        public void Empty()
        {
            Content = 0;
        }
    }
}