[MIRROR] EMP & Wires refactor (#12658)

Co-authored-by: Guti <32563288+TheCaramelion@users.noreply.github.com>
Co-authored-by: Cameron Lennox <killer65311@gmail.com>

code/modules/shieldgen/directional_shield.dm

@@ -227,6 +227,9 @@
 		. += "Its shield matrix is at [round( (shield_health / max_shield_health) * 100, 0.01)]% strength."
 
 /obj/item/shield_projector/emp_act(severity, recursive)
+	. = ..()
+	if (. & EMP_PROTECT_SELF)
+		return
 	adjust_health(-max_shield_health / severity) // A strong EMP will kill the shield instantly, but weaker ones won't on the first hit.
 
 // Subtypes

code/modules/shieldgen/emergency_shield.dm

@@ -81,6 +81,9 @@
 	return
 
 /obj/machinery/shield/emp_act(severity, recursive)
+	. = ..()
+	if (. & EMP_PROTECT_SELF)
+		return
 	switch(severity)
 		if(1)
 			qdel(src)
@@ -257,6 +260,9 @@
 	return
 
 /obj/machinery/shieldgen/emp_act(severity, recursive)
+	. = ..()
+	if (. & EMP_PROTECT_SELF)
+		return
 	switch(severity)
 		if(1)
 			src.health /= 2 //cut health in half

code/modules/shieldgen/energy_shield.dm

@@ -215,9 +215,10 @@
 
 // EMP. It may seem weak but keep in mind that multiple shield segments are likely to be affected.
 /obj/effect/shield/emp_act(severity, recursive)
-	if(!disabled_for)
-		take_damage(rand(30,60) / severity, SHIELD_DAMTYPE_EM)
-
+	. = ..()
+	if (. & EMP_PROTECT_SELF || disabled_for)
+		return
+	take_damage(rand(30,60) / severity, SHIELD_DAMTYPE_EM)
 
 // Explosions
 /obj/effect/shield/ex_act(var/severity)

code/modules/shieldgen/shield_generator.dm

@@ -8,7 +8,6 @@
 	icon_state = "generator0"
 	circuit = /obj/item/circuitboard/shield_generator
 	density = TRUE
-	var/datum/wires/shield_generator/wires = null
 	var/list/field_segments = list()    // List of all shield segments owned by this generator.
 	var/list/damaged_segments = list()  // List of shield segments that have failed and are currently regenerating.
 	var/shield_modes = 0                // Enabled shield mode flags
@@ -52,8 +51,7 @@
 
 /obj/machinery/power/shield_generator/Initialize(mapload)
 	. = ..()
-	if(!wires)
-		wires = new(src)
+	set_wires(new /datum/wires/shield_generator(src))
 	default_apply_parts()
 	connect_to_network()