using System;

namespace YachtDice.Run
{
    public sealed class StoredRollBank
    {
        public int Value { get; private set; }

        public event Action<int> OnChanged;

        public void Reset()
        {
            SetValue(0);
        }

        public void Add(int amount)
        {
            if (amount <= 0)
                return;

            SetValue(Value + amount);
        }

        public bool TrySpend(int amount)
        {
            if (amount <= 0 || Value < amount)
                return false;

            SetValue(Value - amount);
            return true;
        }

        private void SetValue(int value)
        {
            Value = Math.Max(0, value);
            OnChanged?.Invoke(Value);
        }
    }
}