From d079e86fcb92fabbcab3ba12df92bfa0b64ce340 Mon Sep 17 00:00:00 2001
From: Jesse <jesse@archangel.wtf>
Date: Thu, 29 May 2025 12:05:41 +0200
Subject: [PATCH] Add OnLazyLoad event so modders can modify LazyLoaded data
 (#297)

* Add OnLazyLoad event so modders can modify LazyLoaded data

* Remove whitespace
---
 .../Utils/Json/LazyLoad.cs                    | 21 +++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/Libraries/SPTarkov.Server.Core/Utils/Json/LazyLoad.cs b/Libraries/SPTarkov.Server.Core/Utils/Json/LazyLoad.cs
index 162d6d7c..effd9d53 100644
--- a/Libraries/SPTarkov.Server.Core/Utils/Json/LazyLoad.cs
+++ b/Libraries/SPTarkov.Server.Core/Utils/Json/LazyLoad.cs
@@ -8,6 +8,12 @@ public class LazyLoad<T>(Func<T> deserialize)
 
     private Timer? autoCleanerTimeout;
 
+    /// <summary>
+    /// <see cref="OnLazyLoad" /> can be subscribed to for mods to modify. It is fired right after lazy loading is complete
+    /// and any modification passed to <see cref="OnLazyLoadEventArgs.Value" /> will stay for the duration of this <see cref="LazyLoad{T}"/>'s lifecycle
+    /// </summary>
+    public event EventHandler<OnLazyLoadEventArgs<T>>? OnLazyLoad;
+
     public T? Value
     {
         get
@@ -16,6 +22,12 @@ public class LazyLoad<T>(Func<T> deserialize)
             {
                 _result = deserialize();
                 _isLoaded = true;
+
+                OnLazyLoadEventArgs<T> args = new(_result);
+                OnLazyLoad?.Invoke(this, args);
+
+                _result = args.Value;
+
                 autoCleanerTimeout = new Timer(
                     _ =>
                     {
@@ -33,9 +45,10 @@ public class LazyLoad<T>(Func<T> deserialize)
             autoCleanerTimeout?.Change(_autoCleanerTimeout, Timeout.InfiniteTimeSpan);
             return _result;
         }
-        set
-        {
-            _result = value;
-        }
     }
 }
+
+public class OnLazyLoadEventArgs<T>(T value) : EventArgs
+{
+    public T Value { get; set; } = value;
+}