Apc covers can now be repaired and replaced (#75129)

You can now weld an unbroken but damaged Apc cover in order to repair
its integrity.

If an Apc cover is broken you can crowbar it off and replace it with a
new one using an Apc frame (but you'll need to weld its integrity back
up to reinforce the haphazard connections you've made)

I also went ahead and added comments to some of the code because Apc
code is a little daunting.

code/game/objects/items/apc_frame.dm

@@ -25,3 +25,16 @@
 			to_chat(user, span_notice("You cut the cables and disassemble the unused power terminal."))
 			qdel(E)
 	return TRUE
+
+/obj/item/wallframe/apc/screwdriver_act(mob/living/user, obj/item/tool)
+	//overriding the wallframe parent screwdriver act with this one which allows applying to existing apc frames.
+
+	var/turf/T = get_step(get_turf(user), user.dir)
+	if(iswallturf(T))
+		if(locate(/obj/machinery/power/apc) in get_turf(user))
+			var/obj/machinery/power/apc/mounted_apc = locate(/obj/machinery/power/apc) in get_turf(user)
+			mounted_apc.attackby(src, user)
+			return TOOL_ACT_TOOLTYPE_SUCCESS
+		T.attackby(src, user)
+	return TOOL_ACT_TOOLTYPE_SUCCESS
+

code/modules/power/apc/apc_attack.dm

@@ -139,12 +139,14 @@
 		if(!(machine_stat & BROKEN || opened == APC_COVER_REMOVED || atom_integrity < max_integrity)) // There is nothing to repair
 			balloon_alert(user, "no reason for repairs!")
 			return
-		if(!(machine_stat & BROKEN) && opened == APC_COVER_REMOVED) // Cover is the only thing broken, we do not need to remove elctronicks to replace cover
+		if((machine_stat & BROKEN) && opened == APC_COVER_REMOVED && has_electronics && terminal) // Cover is the only thing broken, we do not need to remove elctronicks to replace cover
 			user.visible_message(span_notice("[user.name] replaces missing APC's cover."))
 			balloon_alert(user, "replacing APC's cover...")
 			if(do_after(user, 20, target = src)) // replacing cover is quicker than replacing whole frame
 				balloon_alert(user, "cover replaced")
 				qdel(attacking_object)
+				update_integrity(30) //needs to be welded to fully repair but can work without
+				set_machine_stat(machine_stat & ~(BROKEN|MAINT))
 				opened = APC_COVER_OPENED
 				update_appearance()
 			return

code/modules/power/apc/apc_main.dm

@@ -264,6 +264,11 @@
 /obj/machinery/power/apc/examine(mob/user)
 	. = ..()
 	if(machine_stat & BROKEN)
+		if(opened != APC_COVER_REMOVED)
+			. += "The cover is broken and can probably be <i>pried</i> off with enough force."
+			return
+		if(terminal && has_electronics)
+			. += "The cover is missing but can be replaced using a new frame."
 		return
 	if(opened)
 		if(has_electronics && terminal)

code/modules/power/apc/apc_tool_act.dm

@@ -1,6 +1,19 @@
 //attack with an item - open/close cover, insert cell, or (un)lock interface
 /obj/machinery/power/apc/crowbar_act(mob/user, obj/item/crowbar)
 	. = TRUE
+
+	//Prying off broken cover
+	if((opened == APC_COVER_CLOSED || opened == APC_COVER_OPENED) && (machine_stat & BROKEN))
+		crowbar.play_tool_sound(src)
+		balloon_alert(user, "prying...")
+		if(!crowbar.use_tool(src, user, 5 SECONDS))
+			return
+		opened = APC_COVER_REMOVED
+		balloon_alert(user, "cover removed")
+		update_appearance()
+		return
+
+	//Opening and closing cover
 	if((!opened && opened != APC_COVER_REMOVED) && !(machine_stat & BROKEN))
 		if(coverlocked && !(machine_stat & MAINT)) // locked...
 			balloon_alert(user, "cover is locked!")
@@ -20,6 +33,7 @@
 		update_appearance()
 		return
 
+	//Taking out the electronics
 	if(!opened || has_electronics != APC_ELECTRONICS_INSTALLED)
 		return
 	if(terminal)
@@ -101,6 +115,24 @@
 
 /obj/machinery/power/apc/welder_act(mob/living/user, obj/item/welder)
 	. = ..()
+
+	//repairing the cover
+	if((atom_integrity < max_integrity) && has_electronics)
+		if(opened == APC_COVER_REMOVED)
+			balloon_alert(user, "no cover to repair!")
+			return
+		if (machine_stat & BROKEN)
+			balloon_alert(user, "too damaged to repair!")
+			return
+		if(!welder.tool_start_check(user, amount=0))
+			return
+		balloon_alert(user, "repairing...")
+		if(welder.use_tool(src, user, 4 SECONDS, volume = 50))
+			update_integrity(min(atom_integrity += 50,max_integrity))
+			balloon_alert(user, "repaired")
+		return TOOL_ACT_TOOLTYPE_SUCCESS
+
+	//disassembling the frame
 	if(!opened || has_electronics || terminal)
 		return
 	if(!welder.tool_start_check(user, amount=3))