Aragas/Bannerlord.MBOptionScreen

using MCM.Common;

using System;

namespace MCM.UI.Actions
{
    internal sealed class ComplexValueTypeAction<T> : IAction where T : struct
    {
        public IRef Context { get; }
        public object? Value => DoFunction(Context.Value as T?);
        public object? Original => UndoFunction(Context.Value as T?);
        private Func<T?, T?> DoFunction { get; }
        private Func<T?, T?> UndoFunction { get; }

        /// <summary>
        /// new ProxyRef(() => ValueType, o => ValueType = o)
        /// </summary>
        [Obsolete("Use the nullable overload instead!", true)]
        public ComplexValueTypeAction(IRef context, Func<T, T> doFunction, Func<T, T> undoFunction)
        {
            Context = context;
            DoFunction = (obj) => obj;
            UndoFunction = (obj) => obj;
        }

        /// <summary>
        /// new ProxyRef(() => ValueType, o => ValueType = o)
        /// </summary>
        public ComplexValueTypeAction(IRef context, Func<T?, T?> doFunction, Func<T?, T?> undoFunction)
        {
            Context = context;
            DoFunction = doFunction;
            UndoFunction = undoFunction;
        }

        public void DoAction() => Context.Value = Value;
        public void UndoAction() => Context.Value = Original;
    }
}