using System;
using System.Collections.Generic;

public struct CustomUnRegister : IUnRegister
{
    private Action mOnUnRegister { get; set; }
    public CustomUnRegister(Action onUnRegister) => mOnUnRegister = onUnRegister;

    public void UnRegister()
    {
        mOnUnRegister.Invoke();
        mOnUnRegister = null;
    }
}

public interface IUnRegister
{
    void UnRegister();
}

public interface IUnRegisterList
{
    List<IUnRegister> UnregisterList { get; }
}

public interface IEasyEvent
{
    IUnRegister Register(Action onEvent);
}

public class EasyEvent : IEasyEvent
{
    private Action mOnEvent = () => { };

    public IUnRegister Register(Action onEvent)
    {
        mOnEvent += onEvent;
        return new CustomUnRegister(() => { UnRegister(onEvent); });
    }

    public void UnRegister(Action onEvent) => mOnEvent -= onEvent;

    public void Trigger() => mOnEvent?.Invoke();
}

public class EasyEvent<T> : IEasyEvent
{
    private Action<T> mOnEvent = e => { };

    public IUnRegister Register(Action<T> onEvent)
    {
        mOnEvent -= onEvent;
        mOnEvent += onEvent;
        return new CustomUnRegister(() => { UnRegister(onEvent); });
    }

    public void UnRegister(Action<T> onEvent) => mOnEvent -= onEvent;


    public void Trigger(T t) => mOnEvent?.Invoke(t);
    public void Close() => mOnEvent = null;
    IUnRegister IEasyEvent.Register(Action onEvent)
    {
        return Register(Action);
        void Action(T _) => onEvent();
    }
}

public class EasyEvent<T, K> : IEasyEvent
{
    private Action<T, K> mOnEvent = (t, k) => { };

    public IUnRegister Register(Action<T, K> onEvent)
    {
        mOnEvent += onEvent;
        return new CustomUnRegister(() => { UnRegister(onEvent); });
    }

    public void UnRegister(Action<T, K> onEvent) => mOnEvent -= onEvent;

    public void Trigger(T t, K k) => mOnEvent?.Invoke(t, k);

    IUnRegister IEasyEvent.Register(Action onEvent)
    {
        return Register(Action);
        void Action(T _, K __) => onEvent();
    }
}

public class EasyEvent<T, K, S> : IEasyEvent
{
    private Action<T, K, S> mOnEvent = (t, k, s) => { };

    public IUnRegister Register(Action<T, K, S> onEvent)
    {
        mOnEvent += onEvent;
        return new CustomUnRegister(() => { UnRegister(onEvent); });
    }

    public void UnRegister(Action<T, K, S> onEvent) => mOnEvent -= onEvent;

    public void Trigger(T t, K k, S s) => mOnEvent?.Invoke(t, k, s);

    IUnRegister IEasyEvent.Register(Action onEvent)
    {
        return Register(Action);
        void Action(T _, K __, S ___) => onEvent();
    }
}