//Engineering Mesons

#define MODE_NONE ""
#define MODE_MESON "meson"
#define MODE_TRAY "t-ray"
#define MODE_RAD "radiation"
#define MODE_SHUTTLE "shuttle"

/obj/item/clothing/glasses/meson/engine
	name = "engineering scanner goggles"
	desc = "Goggles used by engineers. The Meson Scanner mode lets you see basic structural and terrain layouts through walls, the T-ray Scanner mode lets you see underfloor objects such as cables and pipes, and the Radiation Scanner mode let's you see objects contaminated by radiation."
	icon_state = "trayson-meson"
	item_state = "trayson-meson"
	actions_types = list(/datum/action/item_action/toggle_mode)

	vision_flags = NONE
	darkness_view = 2
	invis_view = SEE_INVISIBLE_LIVING

	var/list/modes = list(MODE_NONE = MODE_MESON, MODE_MESON = MODE_TRAY, MODE_TRAY = MODE_RAD, MODE_RAD = MODE_NONE)
	var/mode = MODE_NONE
	var/range = 1

/obj/item/clothing/glasses/meson/engine/prescription
	name = "prescription engineering scanner goggles"
	desc = "Goggles used by engineers. The Meson Scanner mode lets you see basic structural and terrain layouts through walls, the T-ray Scanner mode lets you see underfloor objects such as cables and pipes, and the Radiation Scanner mode let's you see objects contaminated by radiation. Each lens has been replaced with a corrective lens."
	vision_correction = 1

/obj/item/clothing/glasses/meson/engine/Initialize()
	. = ..()
	START_PROCESSING(SSobj, src)
	update_icon()

/obj/item/clothing/glasses/meson/engine/Destroy()
	STOP_PROCESSING(SSobj, src)
	return ..()

/obj/item/clothing/glasses/meson/engine/proc/toggle_mode(mob/user, voluntary)
	mode = modes[mode]
	to_chat(user, "<span class='[voluntary ? "notice":"warning"]'>[voluntary ? "You turn the goggles":"The goggles turn"] [mode ? "to [mode] mode":"off"][voluntary ? ".":"!"]</span>")

	switch(mode)
		if(MODE_MESON)
			vision_flags = SEE_TURFS
			darkness_view = 1
			lighting_alpha = LIGHTING_PLANE_ALPHA_MOSTLY_VISIBLE

		if(MODE_TRAY) //undoes the last mode, meson
			vision_flags = NONE
			darkness_view = 2
			lighting_alpha = null

	if(ishuman(user))
		var/mob/living/carbon/human/H = user
		if(H.glasses == src)
			H.update_sight()

	update_icon()
	for(var/X in actions)
		var/datum/action/A = X
		A.UpdateButtonIcon()

/obj/item/clothing/glasses/meson/engine/attack_self(mob/user)
	toggle_mode(user, TRUE)

/obj/item/clothing/glasses/meson/engine/process()
	if(!ishuman(loc))
		return
	var/mob/living/carbon/human/user = loc
	if(user.glasses != src || !user.client)
		return
	switch(mode)
		if(MODE_TRAY)
			t_ray_scan(user, 8, range)
		if(MODE_RAD)
			show_rads()
		if(MODE_SHUTTLE)
			show_shuttle()

/obj/item/clothing/glasses/meson/engine/proc/show_rads()
	var/mob/living/carbon/human/user = loc
	var/list/rad_places = list()
	for(var/datum/component/radioactive/thing in SSradiation.processing)
		var/atom/owner = thing.parent
		var/turf/place = get_turf(owner)
		if(rad_places[place])
			rad_places[place] += thing.strength
		else
			rad_places[place] = thing.strength

	for(var/i in rad_places)
		var/turf/place = i
		if(get_dist(user, place) >= range*2)	//Rads are easier to see than wires under the floor
			continue
		var/strength = round(rad_places[i] / 1000, 0.1)
		var/image/pic = new(loc = place)
		var/mutable_appearance/MA = new()
		MA.alpha = 180
		MA.maptext = "[strength]k"
		MA.color = "#64C864"
		MA.layer = FLY_LAYER
		pic.appearance = MA
		flick_overlay(pic, list(user.client), 8)

/obj/item/clothing/glasses/meson/engine/proc/show_shuttle()
	var/mob/living/carbon/human/user = loc
	var/obj/docking_port/mobile/port = SSshuttle.get_containing_shuttle(user)
	if(!port)
		return
	var/list/shuttle_areas = port.shuttle_areas
	for(var/r in shuttle_areas)
		var/area/region = r
		for(var/turf/place in region.contents)
			if(get_dist(user, place) > 7)
				continue
			var/image/pic
			if(isshuttleturf(place))
				pic = new('icons/turf/overlays.dmi', place, "greenOverlay", AREA_LAYER)
			else
				pic = new('icons/turf/overlays.dmi', place, "redOverlay", AREA_LAYER)
			flick_overlay(pic, list(user.client), 8)

/obj/item/clothing/glasses/meson/engine/update_icon()
	icon_state = "trayson-[mode]"
	update_mob()

/obj/item/clothing/glasses/meson/engine/proc/update_mob()
	item_state = icon_state
	if(isliving(loc))
		var/mob/living/user = loc
		if(user.get_item_by_slot(SLOT_GLASSES) == src)
			user.update_inv_glasses()
		else
			user.update_inv_hands()

/obj/item/clothing/glasses/meson/engine/tray //atmos techs have lived far too long without tray goggles while those damned engineers get their dual-purpose gogles all to themselves
	name = "optical t-ray scanner"
	icon_state = "trayson-t-ray"
	item_state = "trayson-t-ray"
	desc = "Used by engineering staff to see underfloor objects such as cables and pipes."
	range = 2

	modes = list(MODE_NONE = MODE_TRAY, MODE_TRAY = MODE_NONE)

/obj/item/clothing/glasses/meson/engine/tray/prescription
	name = "prescription optical t-ray scanner"
	desc = "Goggles used by engineers. The Meson Scanner mode lets you see basic structural and terrain layouts through walls, the T-ray Scanner mode lets you see underfloor objects such as cables and pipes, and the Radiation Scanner mode let's you see objects contaminated by radiation. This one has a lens that help correct eye sight."
	vision_correction = 1

/obj/item/clothing/glasses/meson/engine/shuttle
	name = "shuttle region scanner"
	icon_state = "trayson-shuttle"
	item_state = "trayson-shuttle"
	desc = "Used to see the boundaries of shuttle regions."

	modes = list(MODE_NONE = MODE_SHUTTLE, MODE_SHUTTLE = MODE_NONE)

#undef MODE_NONE
#undef MODE_MESON
#undef MODE_TRAY
#undef MODE_RAD
#undef MODE_SHUTTLE