quantum-space-buddies/QSB/EchoesOfTheEye/LightSensorSync/Patches/LightSensorPatches.cs

using HarmonyLib;
using QSB.EchoesOfTheEye.LightSensorSync.WorldObjects;
using QSB.Patches;
using QSB.WorldSync;
using System.Collections.Generic;
using UnityEngine;

/*
 * For those who come here,
 * leave while you still can.
 */

namespace QSB.EchoesOfTheEye.LightSensorSync.Patches;

[HarmonyPatch(typeof(SingleLightSensor))]
internal class LightSensorPatches : QSBPatch
{
	public override QSBPatchTypes Type => QSBPatchTypes.OnClientConnect;

	[HarmonyPrefix]
	[HarmonyPatch(nameof(SingleLightSensor.OnSectorOccupantsUpdated))]
	private static bool OnSectorOccupantsUpdated(SingleLightSensor __instance)
	{
		if (LightSensorManager.IsPlayerLightSensor(__instance))
		{
			return true;
		}
		if (!QSBWorldSync.AllObjectsReady)
		{
			return true;
		}
		var qsbLightSensor = __instance.GetWorldObject<QSBLightSensor>();

		var containsAnyOccupants = __instance._sector.ContainsAnyOccupants(DynamicOccupant.Player | DynamicOccupant.Probe);
		if (containsAnyOccupants && !__instance.enabled)
		{
			__instance.enabled = true;
			__instance._lightDetector.GetShape().enabled = true;
			if (__instance._preserveStateWhileDisabled)
			{
				__instance._fixedUpdateFrameDelayCount = 10;
			}
		}
		else if (!containsAnyOccupants && __instance.enabled)
		{
			__instance.enabled = false;
			__instance._lightDetector.GetShape().enabled = false;
			if (!__instance._preserveStateWhileDisabled)
			{
				if (__instance._illuminated)
				{
					__instance.OnDetectDarkness.Invoke();
				}
				__instance._illuminated = false;
			}
		}
		return false;
	}

	/// <summary>
	/// to prevent allocating a new list every frame
	/// </summary>
	private static readonly List<DreamLanternController> _illuminatingDreamLanternList = new();

	[HarmonyPrefix]
	[HarmonyPatch(nameof(SingleLightSensor.ManagedFixedUpdate))]
	private static bool ManagedFixedUpdate(SingleLightSensor __instance)
	{
		if (LightSensorManager.IsPlayerLightSensor(__instance))
		{
			return true;
		}
		if (!QSBWorldSync.AllObjectsReady)
		{
			return true;
		}
		var qsbLightSensor = __instance.GetWorldObject<QSBLightSensor>();

		if (__instance._fixedUpdateFrameDelayCount > 0)
		{
			__instance._fixedUpdateFrameDelayCount--;
			return false;
		}
		var illuminated = __instance._illuminated;
		var locallyIlluminated = qsbLightSensor._locallyIlluminated;
		__instance.UpdateIllumination();
		if (!illuminated && __instance._illuminated)
		{
			__instance.OnDetectLight.Invoke();
			return false;
		}
		if (illuminated && !__instance._illuminated)
		{
			__instance.OnDetectDarkness.Invoke();
		}
		if (!locallyIlluminated && qsbLightSensor._locallyIlluminated)
		{
			qsbLightSensor.OnDetectLocalLight.Invoke();
			return false;
		}
		if (locallyIlluminated && !qsbLightSensor._locallyIlluminated)
		{
			qsbLightSensor.OnDetectLocalDarkness.Invoke();
		}
		return false;
	}

	[HarmonyPrefix]
	[HarmonyPatch(nameof(SingleLightSensor.UpdateIllumination))]
	private static bool UpdateIllumination(SingleLightSensor __instance)
	{
		if (LightSensorManager.IsPlayerLightSensor(__instance))
		{
			return true;
		}
		if (!QSBWorldSync.AllObjectsReady)
		{
			return true;
		}
		var qsbLightSensor = __instance.GetWorldObject<QSBLightSensor>();

		__instance._illuminated = false;
		qsbLightSensor._locallyIlluminated = false;
		__instance._illuminatingDreamLanternList?.Clear();
		if (__instance._lightSources == null || __instance._lightSources.Count == 0)
		{
			return false;
		}
		var sensorWorldPos = __instance.transform.TransformPoint(__instance._localSensorOffset);
		var sensorWorldDir = Vector3.zero;
		if (__instance._directionalSensor)
		{
			sensorWorldDir = __instance.transform.TransformDirection(__instance._localDirection).normalized;
		}
		foreach (var lightSource in __instance._lightSources)
		{
			if ((__instance._lightSourceMask & lightSource.GetLightSourceType()) == lightSource.GetLightSourceType() &&
				lightSource.CheckIlluminationAtPoint(sensorWorldPos, __instance._sensorRadius, __instance._maxDistance))
			{
				switch (lightSource.GetLightSourceType())
				{
					case LightSourceType.UNDEFINED:
						{
							var owlight = lightSource as OWLight2;
							var occludableLight = owlight.GetLight().shadows != LightShadows.None &&
								owlight.GetLight().shadowStrength > 0.5f;
							if (owlight.CheckIlluminationAtPoint(sensorWorldPos, __instance._sensorRadius, __instance._maxDistance) &&
								!__instance.CheckOcclusion(owlight.transform.position, sensorWorldPos, sensorWorldDir, occludableLight))
							{
								__instance._illuminated = true;
							}
							break;
						}
					case LightSourceType.FLASHLIGHT:
						{
							var position = Locator.GetPlayerCamera().transform.position;
							var vector3 = __instance.transform.position - position;
							if (Vector3.Angle(Locator.GetPlayerCamera().transform.forward, vector3) <= __instance._maxSpotHalfAngle &&
								!__instance.CheckOcclusion(position, sensorWorldPos, sensorWorldDir))
							{
								__instance._illuminated = true;
							}
							break;
						}
					case LightSourceType.PROBE:
						{
							var probe = Locator.GetProbe();
							if (probe != null &&
								probe.IsLaunched() &&
								!probe.IsRetrieving() &&
								probe.CheckIlluminationAtPoint(sensorWorldPos, __instance._sensorRadius, __instance._maxDistance) &&
								!__instance.CheckOcclusion(probe.GetLightSourcePosition(), sensorWorldPos, sensorWorldDir))
							{
								__instance._illuminated = true;
							}
							break;
						}
					case LightSourceType.DREAM_LANTERN:
						{
							var dreamLanternController = lightSource as DreamLanternController;
							if (dreamLanternController.IsLit() &&
								dreamLanternController.IsFocused(__instance._lanternFocusThreshold) &&
								dreamLanternController.CheckIlluminationAtPoint(sensorWorldPos, __instance._sensorRadius, __instance._maxDistance) &&
								!__instance.CheckOcclusion(dreamLanternController.GetLightPosition(), sensorWorldPos, sensorWorldDir))
							{
								__instance._illuminatingDreamLanternList.Add(dreamLanternController);
								__instance._illuminated = true;
							}
							break;
						}
					case LightSourceType.SIMPLE_LANTERN:
						foreach (var owlight in lightSource.GetLights())
						{
							var occludableLight = owlight.GetLight().shadows != LightShadows.None &&
								owlight.GetLight().shadowStrength > 0.5f;
							var maxDistance = Mathf.Min(__instance._maxSimpleLanternDistance, __instance._maxDistance);
							if (owlight.CheckIlluminationAtPoint(sensorWorldPos, __instance._sensorRadius, maxDistance) &&
								!__instance.CheckOcclusion(owlight.transform.position, sensorWorldPos, sensorWorldDir, occludableLight))
							{
								__instance._illuminated = true;
								break;
							}
						}
						break;
					case LightSourceType.VOLUME_ONLY:
						__instance._illuminated = true;
						break;
				}
			}
		}
		return false;
	}
}