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// -------------------------------------------

// Nick Perrin 2024 - https://github.com/NPTP/

// -------------------------------------------

using System;

using System.Collections.Generic;

using System.Linq;

using UnityEngine;

using UnityEngine.LowLevel;

using UnityEngine.PlayerLoop;

using UpdateFunction = UnityEngine.LowLevel.PlayerLoopSystem.UpdateFunction;

#if UNITY_EDITOR

using UnityEditor;

#endif

namespace NPTP.PlayerLoopUtility

{

public static class PlayerLoopUtility

{

private static readonly HashSet<PlayerLoopSetup> subscribedSetups = new();

private static PlayerLoopSetup<EarlyUpdate> earlyUpdateSetup;

private static PlayerLoopSetup<Update> updateSetup;

private static PlayerLoopSetup<PreLateUpdate> preLateUpdateSetup;

private static PlayerLoopSetup<PostLateUpdate> postLateUpdateSetup;

private static PlayerLoopSetup<FixedUpdate> fixedUpdateSetup;

public static event Action OnPlayerLoopEarlyUpdate

{

add => AddToSubscribers(value, ref earlyUpdateSetup);

remove => RemoveFromSubscribers(value, ref earlyUpdateSetup);

}

public static event Action OnPlayerLoopUpdate

{

add => AddToSubscribers(value, ref updateSetup);

remove => RemoveFromSubscribers(value, ref updateSetup);

}

public static event Action OnPlayerLoopPreLateUpdate

{

add => AddToSubscribers(value, ref preLateUpdateSetup);

remove => RemoveFromSubscribers(value, ref preLateUpdateSetup);

}

public static event Action OnPlayerLoopPostLateUpdate

{

add => AddToSubscribers(value, ref postLateUpdateSetup);

remove => RemoveFromSubscribers(value, ref postLateUpdateSetup);

}

public static event Action OnPlayerLoopFixedUpdate

{

add => AddToSubscribers(value, ref fixedUpdateSetup);

remove => RemoveFromSubscribers(value, ref fixedUpdateSetup);

}

private static void AddToSubscribers<T>(Action subscriber, ref T playerLoopSetup) where T : PlayerLoopSetup, new()

{

if (subscriber == null)

{

return;

}

if (playerLoopSetup == null)

{

playerLoopSetup = new T();

ChangeInternalSubscription(playerLoopSetup, Subscription.Add);

}

playerLoopSetup.OnUpdate += subscriber;

playerLoopSetup.SubscribedDelegates.Add(subscriber);

}

private static void RemoveFromSubscribers<T>(Action subscriber, ref T playerLoopSetup) where T : PlayerLoopSetup

{

if (subscriber == null)

{

return;

}

playerLoopSetup.OnUpdate -= subscriber;

playerLoopSetup.SubscribedDelegates.Remove(subscriber);

if (!playerLoopSetup.HasSubscribers)

{

ChangeInternalSubscription(playerLoopSetup, Subscription.Remove);

playerLoopSetup = null;

}

}

private static void ChangeInternalSubscription(PlayerLoopSetup playerLoopSetup, Subscription subscription)

{

PlayerLoopSystem playerLoop = UnityEngine.LowLevel.PlayerLoop.GetCurrentPlayerLoop();

UpdateFunction updateFunction = playerLoopSetup.UpdateFunction;

int subsystemIndex = GetIndexOfSubsystem(playerLoop, playerLoopSetup.UpdateType);

playerLoop.subSystemList[subsystemIndex].updateDelegate -= updateFunction; // Prevent multi-subscriptions

if (subscription is Subscription.Add)

playerLoop.subSystemList[subsystemIndex].updateDelegate += updateFunction;

if (subscription is Subscription.Remove)

subscribedSetups.Remove(playerLoopSetup);

else if (subscription is Subscription.Add)

subscribedSetups.Add(playerLoopSetup);

UnityEngine.LowLevel.PlayerLoop.SetPlayerLoop(playerLoop);

}

private static int GetIndexOfSubsystem(PlayerLoopSystem playerLoop, Type subsystemType)

{

int i;

for (i = 0; i < playerLoop.subSystemList.Length; i++)

{

PlayerLoopSystem playerLoopSystem = playerLoop.subSystemList[i];

if (playerLoopSystem.type == subsystemType)

{

break;

}

}

return i;

}

private static void UnsubscribeAllInternalDelegates()

{

PlayerLoopSetup[] setups = subscribedSetups.ToArray();

for (int i = 0; i < setups.Length; i++)

{

ChangeInternalSubscription(setups[i], Subscription.Remove);

}

}

#if UNITY_EDITOR

[RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]

private static void PlayModeStateNotifier()

{

EditorApplication.playModeStateChanged -= HandlePlayModeStateChanged;

EditorApplication.playModeStateChanged += HandlePlayModeStateChanged;

}

private static void HandlePlayModeStateChanged(PlayModeStateChange playModeStateChange)

{

if (playModeStateChange is PlayModeStateChange.ExitingPlayMode)

{

EditorApplication.playModeStateChanged -= HandlePlayModeStateChanged;

UnsubscribeAllInternalDelegates();

}

}

#endif

}

}