add BeforeGameEndEvent.cs

MiraAPI/Events/Vanilla/Gameplay/BeforeGameEndEvent.cs

@@ -0,0 +1,21 @@
+namespace MiraAPI.Events.Vanilla.Gameplay;
+
+/// <summary>
+/// Invoked before RpcEndGame is called, allowing cancellation of the game end entirely.
+/// </summary>
+public class BeforeGameEndEvent : MiraCancelableEvent
+{
+    /// <summary>
+    /// Gets the reason for the game end.
+    /// </summary>
+    public GameOverReason Reason { get; }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="BeforeGameEndEvent"/> class.
+    /// </summary>
+    /// <param name="reason">The reason for the game end.</param>
+    public BeforeGameEndEvent(GameOverReason reason)
+    {
+        Reason = reason;
+    }
+}

MiraAPI/Patches/Events/EndGamePatches.cs

@@ -5,29 +5,44 @@ using MiraAPI.GameEnd;
 
 namespace MiraAPI.Patches.Events;
 
-[HarmonyPatch(typeof(EndGameManager), nameof(EndGameManager.SetEverythingUp))]
 internal static class EndGamePatches
 {
-    public static bool Prefix(EndGameManager __instance)
+    [HarmonyPatch(typeof(GameManager), nameof(GameManager.RpcEndGame))]
+    public static class GameManagerPatches
     {
-        if (CustomGameOver.Instance is not { } gameOver)
+        public static bool Prefix(GameOverReason endReason)
         {
-            return true;
-        }
+            var @event = new BeforeGameEndEvent(endReason);
+            MiraEventManager.InvokeEvent(@event);
 
-        var result = gameOver.BeforeEndGameSetup(__instance);
-        return result;
+            return !@event.IsCancelled;
+        }
     }
 
-    public static void Postfix(EndGameManager __instance)
+    [HarmonyPatch(typeof(EndGameManager), nameof(EndGameManager.SetEverythingUp))]
+    public static class EndGameManagerPatches
     {
-        if (CustomGameOver.Instance is { } gameOver)
+        public static bool Prefix(EndGameManager __instance)
         {
-            gameOver.AfterEndGameSetup(__instance);
-            CustomGameOver.Instance = null;
+            if (CustomGameOver.Instance is not { } gameOver)
+            {
+                return true;
+            }
+
+            var result = gameOver.BeforeEndGameSetup(__instance);
+            return result;
         }
 
-        var @event = new GameEndEvent(__instance);
-        MiraEventManager.InvokeEvent(@event);
+        public static void Postfix(EndGameManager __instance)
+        {
+            if (CustomGameOver.Instance is { } gameOver)
+            {
+                gameOver.AfterEndGameSetup(__instance);
+                CustomGameOver.Instance = null;
+            }
+
+            var @event = new GameEndEvent(__instance);
+            MiraEventManager.InvokeEvent(@event);
+        }
     }
 }