using System;

namespace Utils
{
    public static class App
    {
        public static event Action Update;
        public static event Action LateUpdate;
        public static event Action EarlyUpdate;
        public static event Action LastUpdate;
        public static event Action FixedUpdate;

        internal static void InvokeUpdate() => Update?.Invoke();
        internal static void InvokeLateUpdate() => LateUpdate?.Invoke();
        internal static void InvokeEarlyUpdate() => EarlyUpdate?.Invoke();
        internal static void InvokeLastUpdate() => LastUpdate?.Invoke();
        internal static void InvokeFixedUpdate() => FixedUpdate?.Invoke();

        internal static void ClearUpdate() => Update = null;
        internal static void ClearLateUpdate() => LateUpdate = null;
        internal static void ClearEarlyUpdate() => EarlyUpdate = null;
        internal static void ClearLastUpdate() => LastUpdate = null;
        internal static void ClearFixedUpdate() => FixedUpdate = null;

        internal static Delegate[] UpdateDelegates => Update?.GetInvocationList();
        internal static Delegate[] LateUpdateDelegates => LateUpdate?.GetInvocationList();
        internal static Delegate[] EarlyUpdateDelegates => EarlyUpdate?.GetInvocationList();
        internal static Delegate[] LastUpdateDelegates => LastUpdate?.GetInvocationList();
        internal static Delegate[] FixedUpdateDelegates => FixedUpdate?.GetInvocationList();

        internal static int UpdateLength => UpdateDelegates?.Length ?? 0;
        internal static int LateUpdateLength => LateUpdateDelegates?.Length ?? 0;
        internal static int EarlyUpdateLength => EarlyUpdateDelegates?.Length ?? 0;
        internal static int LastUpdateLength => LastUpdateDelegates?.Length ?? 0;
        internal static int FixedUpdateLength => FixedUpdateDelegates?.Length ?? 0;
    }
}