Fix AI core dropping wrong circuit on decon (#40742)

Also cleaned up a couple vars and added qdel handling.

code/__HELPERS/unsorted.dm

@@ -259,7 +259,7 @@ Turf and target are separate in case you want to teleport some distance from a t
 	for(var/mob/living/silicon/ai/A in GLOB.alive_mob_list)
 		if(A.stat == DEAD)
 			continue
-		if(A.control_disabled == 1)
+		if(A.control_disabled)
 			continue
 		if(check_mind)
 			if(!A.mind)

code/game/machinery/computer/aifixer.dm

@@ -129,8 +129,8 @@
 			return
 		AI.forceMove(src)
 		occupier = AI
-		AI.control_disabled = 1
-		AI.radio_enabled = 0
+		AI.control_disabled = TRUE
+		AI.radio_enabled = FALSE
 		to_chat(AI, "You have been uploaded to a stationary terminal. Sadly, there is no remote access from here.")
 		to_chat(user, "<span class='boldnotice'>Transfer successful</span>: [AI.name] ([rand(1000,9999)].exe) installed and executed successfully. Local copy has been removed.")
 		card.AI = null

code/game/mecha/mecha.dm

@@ -688,8 +688,8 @@
 				to_chat(user, "<span class='warning'>No AI detected in the [name] onboard computer.</span>")
 				return
 			AI.ai_restore_power()//So the AI initially has power.
-			AI.control_disabled = 1
-			AI.radio_enabled = 0
+			AI.control_disabled = TRUE
+			AI.radio_enabled = FALSE
 			AI.disconnect_shell()
 			RemoveActions(AI, TRUE)
 			occupant = null
@@ -723,8 +723,8 @@
 			if(occupant || dna_lock) //Normal AIs cannot steal mechs!
 				to_chat(user, "<span class='warning'>Access denied. [name] is [occupant ? "currently occupied" : "secured with a DNA lock"].</span>")
 				return
-			AI.control_disabled = 0
-			AI.radio_enabled = 1
+			AI.control_disabled = FALSE
+			AI.radio_enabled = TRUE
 			to_chat(user, "<span class='boldnotice'>Transfer successful</span>: [AI.name] ([rand(1000,9999)].exe) installed and executed successfully. Local copy has been removed.")
 			card.AI = null
 			ai_enter_mech(AI, interaction)

code/game/objects/structures/ai_core.dm

@@ -6,10 +6,10 @@
 	icon_state = "0"
 	desc = "The framework for an artificial intelligence core."
 	max_integrity = 500
-	var/state = 0
+	var/state = EMPTY_CORE
 	var/datum/ai_laws/laws
-	var/obj/item/circuitboard/circuit = null
-	var/obj/item/mmi/brain = null
+	var/obj/item/circuitboard/aicore/circuit
+	var/obj/item/mmi/brain
 	var/can_deconstruct = TRUE
 
 /obj/structure/AIcore/Initialize()
@@ -17,6 +17,17 @@
 	laws = new
 	laws.set_laws_config()
 
+/obj/structure/AIcore/handle_atom_del(atom/A)
+	if(A == circuit)
+		circuit = null
+		if((state != GLASS_CORE) && (state != AI_READY_CORE))
+			state = EMPTY_CORE
+			update_icon()
+	if(A == brain)
+		brain = null
+	. = ..()
+
+
 /obj/structure/AIcore/Destroy()
 	if(circuit)
 		qdel(circuit)
@@ -307,16 +318,16 @@ That prevents a few funky behaviors.
 	if(istype(card))
 		if(card.flush)
 			to_chat(user, "<span class='boldannounce'>ERROR</span>: AI flush is in progress, cannot execute transfer protocol.")
-			return 0
-	return 1
+			return FALSE
+	return TRUE
 
 /obj/structure/AIcore/transfer_ai(interaction, mob/user, mob/living/silicon/ai/AI, obj/item/aicard/card)
 	if(state != AI_READY_CORE || !..())
 		return
  //Transferring a carded AI to a core.
 	if(interaction == AI_TRANS_FROM_CARD)
-		AI.control_disabled = 0
-		AI.radio_enabled = 1
+		AI.control_disabled = FALSE
+		AI.radio_enabled = TRUE
 		AI.forceMove(loc) // to replace the terminal.
 		to_chat(AI, "You have been uploaded to a stationary terminal. Remote device connection restored.")
 		to_chat(user, "<span class='boldnotice'>Transfer successful</span>: [AI.name] ([rand(1000,9999)].exe) installed and executed successfully. Local copy has been removed.")

code/modules/mob/living/silicon/ai/ai.dm

@@ -426,14 +426,14 @@
 			to_chat(src, "<span class='danger'>Error: Your last call bot command is still processing, please wait for the bot to finish calculating a route.</span>")
 			return
 		Bot = locate(href_list["callbot"]) in GLOB.alive_mob_list
-		if(!Bot || Bot.remote_disabled || src.control_disabled)
+		if(!Bot || Bot.remote_disabled || control_disabled)
 			return //True if there is no bot found, the bot is manually emagged, or the AI is carded with wireless off.
 		waypoint_mode = 1
 		to_chat(src, "<span class='notice'>Set your waypoint by clicking on a valid location free of obstructions.</span>")
 		return
 	if(href_list["interface"]) //Remotely connect to a bot!
 		Bot = locate(href_list["interface"]) in GLOB.alive_mob_list
-		if(!Bot || Bot.remote_disabled || src.control_disabled)
+		if(!Bot || Bot.remote_disabled || control_disabled)
 			return
 		Bot.attack_ai(src)
 	if(href_list["botrefresh"]) //Refreshes the bot control panel.
@@ -812,8 +812,8 @@
 		ShutOffDoomsdayDevice()
 		new /obj/structure/AIcore/deactivated(loc)//Spawns a deactivated terminal at AI location.
 		ai_restore_power()//So the AI initially has power.
-		control_disabled = 1//Can't control things remotely if you're stuck in a card!
-		radio_enabled = 0 	//No talking on the built-in radio for you either!
+		control_disabled = TRUE //Can't control things remotely if you're stuck in a card!
+		radio_enabled = FALSE 	//No talking on the built-in radio for you either!
 		forceMove(card)
 		card.AI = src
 		to_chat(src, "You have been downloaded to a mobile storage device. Remote device connection severed.")