From 663339986d81a18b9a20d6177a9dcf0a8b960cfd Mon Sep 17 00:00:00 2001
From: Pooble <90473506+poobsie@users.noreply.github.com>
Date: Thu, 27 Nov 2025 23:08:09 -0500
Subject: [PATCH] IPC arm implant no longer overridden by cybernetic revolution
 (#31044)

* makes cybernetic implant not overwrite arm implant

* fix for case of no arms
---
 code/datums/station_traits/positive_traits.dm | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/code/datums/station_traits/positive_traits.dm b/code/datums/station_traits/positive_traits.dm
index 46a5ef8340a..77f6224bd13 100644
--- a/code/datums/station_traits/positive_traits.dm
+++ b/code/datums/station_traits/positive_traits.dm
@@ -220,4 +220,31 @@
 			ai.eyeobj.relay_speech = TRUE //surveillance upgrade. the ai gets cybernetics too.
 		return
 	var/obj/item/organ/internal/cybernetic = new cybernetic_type()
+
+	// Prevent replacing existing arm implants (protect IPC arm implant)
+	if(istype(cybernetic, /obj/item/organ/internal/cyberimp/arm))
+		var/obj/item/organ/internal/cyberimp/arm/arm_implant = cybernetic
+
+		var/obj/item/organ/external/left_arm = spawned.get_organ("l_arm")
+		var/obj/item/organ/external/right_arm = spawned.get_organ("r_arm")
+
+		var/obj/item/organ/internal/left_arm_implant = spawned.get_organ_slot("l_arm_device")
+		var/obj/item/organ/internal/right_arm_implant = spawned.get_organ_slot("r_arm_device")
+
+		// Try left arm first, then right arm, then replace left arm if both occupied, then just give up.
+		if(left_arm && !left_arm_implant)
+			arm_implant.slot = "l_arm_device"
+			arm_implant.parent_organ = "l_arm"
+		else if(right_arm && !right_arm_implant)
+			arm_implant.slot = "r_arm_device"
+			arm_implant.parent_organ = "r_arm"
+		else if(left_arm)
+			left_arm_implant.remove(spawned)
+			qdel(left_arm_implant)
+			arm_implant.slot = "l_arm_device"
+			arm_implant.parent_organ = "l_arm"
+		else
+			qdel(arm_implant)
+			return
+
 	INVOKE_ASYNC(cybernetic, TYPE_PROC_REF(/obj/item/organ/internal, insert), spawned, TRUE)