From 2a161f47277386ec6789d427218591775050e2ff Mon Sep 17 00:00:00 2001
From: CitadelStationBot <citadelstationcommunity@gmail.com>
Date: Mon, 5 Mar 2018 13:01:18 -0600
Subject: [PATCH] [MIRROR] Fix brains in MMIs being unable to pilot mechs
 (#5808)

* Merge pull request #36128 from AutomaticFrenzy/patch/brainmech

Fix brains in MMIs being unable to pilot mechs

* Fix brains in MMIs being unable to pilot mechs
---
 code/game/mecha/mecha.dm | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/code/game/mecha/mecha.dm b/code/game/mecha/mecha.dm
index 3e29a6f07e..b9dcbbfd03 100644
--- a/code/game/mecha/mecha.dm
+++ b/code/game/mecha/mecha.dm
@@ -370,15 +370,21 @@
 				occupant.throw_alert("mech damage", /obj/screen/alert/low_mech_integrity, 3)
 			else
 				occupant.clear_alert("mech damage")
-		var/actual_loc = occupant.loc
-		if(istype(actual_loc, /obj/item/device/mmi))
-			var/obj/item/device/mmi/M = actual_loc
-			actual_loc = M.mecha
-		if(actual_loc != src) //something went wrong
-			occupant.clear_alert("charge")
-			occupant.clear_alert("mech damage")
-			RemoveActions(occupant, human_occupant=1)
-			occupant = null
+		var/atom/checking = occupant.loc
+		// recursive check to handle all cases regarding very nested occupants,
+		// such as brainmob inside brainitem inside MMI inside mecha
+		while (!isnull(checking))
+			if (isturf(checking))
+				// hit a turf before hitting the mecha, seems like they have
+				// been moved out
+				occupant.clear_alert("charge")
+				occupant.clear_alert("mech damage")
+				RemoveActions(occupant, human_occupant=1)
+				occupant = null
+				break
+			else if (checking == src)
+				break  // all good
+			checking = checking.loc
 
 	if(lights)
 		var/lights_energy_drain = 2