/obj/item/multitool/hacktool
	var/is_hacking = 0
	var/max_known_targets
	var/hackspeed = 1
	var/max_level = 4		//what's the max door security_level we can handle?
	var/full_override = FALSE	//can we override door bolts too? defaults to false for event/safety reasons

	var/in_hack_mode = 0
	var/list/known_targets
	var/list/supported_types
	var/datum/tgui_state/default/must_hack/hack_state
	pickup_sound = 'sound/items/pickup/device.ogg'
	drop_sound = 'sound/items/drop/device.ogg'

/obj/item/multitool/hacktool/override
	hackspeed = 0.75
	max_level = 5
	full_override = TRUE

/obj/item/multitool/hacktool/New()
	..()
	known_targets = list()
	max_known_targets = 5 + rand(1,3)
	supported_types = list(/obj/machinery/door/airlock,/obj/structure/closet/crate/secure,/obj/structure/closet/secure_closet)
	hack_state = new(src)

/obj/item/multitool/hacktool/Destroy()
	for(var/atom/target as anything in known_targets)
		target.unregister(OBSERVER_EVENT_DESTROY, src)
	known_targets.Cut()
	qdel(hack_state)
	hack_state = null
	return ..()

/obj/item/multitool/hacktool/attackby(var/obj/item/W, var/mob/user)
	if(W.has_tool_quality(TOOL_SCREWDRIVER))
		in_hack_mode = !in_hack_mode
		playsound(src, W.usesound, 50, 1)
	else
		..()

/obj/item/multitool/hacktool/afterattack(atom/A, mob/user)
	sanity_check()

	if(!in_hack_mode)
		return ..()

	if(!attempt_hack(user, A))
		return 0

	// Note, if you ever want to expand supported_types, you must manually add the custom state argument to their tgui_interact
	// DISABLED: too fancy, too high-effort // A.tgui_interact(user, custom_state = hack_state)
	// Just brute-force it
	if(istype(A, /obj/machinery/door/airlock))
		var/obj/machinery/door/airlock/D = A
		if(!D.arePowerSystemsOn())
			to_chat(user, span_warning("No response from remote, check door power."))
		else if(D.locked == TRUE && full_override == FALSE)
			to_chat(user, span_warning("Unable to override door bolts!"))
		else if(D.locked == TRUE && full_override == TRUE && D.arePowerSystemsOn())
			to_chat(user, span_notice("Door bolts overridden."))
			D.unlock()
		else if(D.density == TRUE && D.locked == FALSE)
			to_chat(user, span_notice("Overriding access. Door opening."))
			D.open()
		else if(D.density == FALSE && D.locked == FALSE)
			to_chat(user, span_notice("Overriding access. Door closing."))
			D.close()
	return 1

/obj/item/multitool/hacktool/proc/attempt_hack(var/mob/user, var/atom/target)
	if(is_hacking)
		to_chat(user, span_warning("You are already hacking!"))
		return 0
	if(!is_type_in_list(target, supported_types))
		to_chat(user, "[icon2html(src, user.client)] " + span_warning("Unable to hack this target, invalid target type."))
		return 0

	if(istype(target, /obj/structure/closet/crate/secure))
		var/obj/structure/closet/crate/secure/A = target
		if(A.locked)
			to_chat(user, span_notice("Overriding access. Stand by."))
			if(do_after(user, (((5 SECONDS + rand(0, 5 SECONDS) + rand(0, 5 SECONDS))*hackspeed))))
				to_chat(user, span_notice("Override successful!"))
				A.locked = FALSE
				A.update_icon()
				playsound(A, 'sound/machines/click.ogg', 15, 1, -3)
		else
			return

	if(istype(target, /obj/structure/closet/secure_closet))
		var/obj/structure/closet/secure_closet/A = target
		if(A.locked)
			to_chat(user, span_notice("Overriding access. Stand by."))
			if(do_after(user, (((5 SECONDS + rand(0, 5 SECONDS) + rand(0, 5 SECONDS))*hackspeed))))
				to_chat(user, span_notice("Override successful!"))
				A.locked = FALSE
				A.update_icon()
				playsound(A, 'sound/machines/click.ogg', 15, 1, -3)
		else
			return

	if(istype(target, /obj/machinery/door/airlock))
		var/obj/machinery/door/airlock/D = target
		if(D.security_level > max_level)
			to_chat(user, "[icon2html(src, user.client)] " + span_warning("Target's electronic security is too complex."))
			return 0

		var/found = known_targets.Find(D)
		if(found)
			known_targets.Swap(1, found)	// Move the last hacked item first
			return 1
		to_chat(user, span_notice("You begin hacking \the [D]..."))
		is_hacking = 1
		// On average hackin takes ~15 seconds. Fairly small random span to discourage people from simply aborting and trying again
		// Reduced hack duration to compensate for the reduced functionality, multiplied by door sec level
		var/hack_result = do_after(user, (((10 SECONDS + rand(0, 10 SECONDS) + rand(0, 10 SECONDS))*hackspeed)*D.security_level))
		is_hacking = 0

		if(hack_result && in_hack_mode)
			to_chat(user, span_notice("Your hacking attempt was succesful!"))
			user.playsound_local(get_turf(src), 'sound/instruments/piano/An6.ogg', 50)
		else
			to_chat(user, span_warning("Your hacking attempt failed!"))
			return 0

		known_targets.Insert(1, D)	// Insert the newly hacked target first,
		D.register(OBSERVER_EVENT_DESTROY, src, /obj/item/multitool/hacktool/proc/on_target_destroy)
		return 1

/obj/item/multitool/hacktool/proc/sanity_check()
	if(max_known_targets < 1) max_known_targets = 1
	// Cut away the oldest items if the capacity has been reached
	if(known_targets.len > max_known_targets)
		for(var/i = (max_known_targets + 1) to known_targets.len)
			var/atom/A = known_targets[i]
			A.unregister(OBSERVER_EVENT_DESTROY, src)
		known_targets.Cut(max_known_targets + 1)

/obj/item/multitool/hacktool/proc/on_target_destroy(var/target)
	known_targets -= target

/datum/tgui_state/default/must_hack
	var/obj/item/multitool/hacktool/hacktool

/datum/tgui_state/default/must_hack/New(var/hacktool)
	src.hacktool = hacktool
	..()

/datum/tgui_state/default/must_hack/Destroy()
	hacktool = null
	return ..()

/datum/tgui_state/default/must_hack/can_use_topic(src_object, mob/user)
	if(!hacktool || !hacktool.in_hack_mode || !(src_object in hacktool.known_targets))
		return STATUS_CLOSE
	return ..()