Migrates meson stuff FULLY to traits (#21609)

* fuckin TRAITS

* pickup -> equip

code/modules/clothing/glasses/engine_goggles.dm

@@ -12,8 +12,7 @@
 	item_state = "trayson-meson"
 	actions_types = list(/datum/action/item_action/toggle_mode)
 	origin_tech = "materials=3;magnets=3;engineering=3;plasmatech=3"
-	vision_flags = NONE
-	invis_view = SEE_INVISIBLE_LIVING
+	active_on_equip = FALSE
 
 	var/list/modes = list(MODE_NONE = MODE_MESON, MODE_MESON = MODE_TRAY, MODE_TRAY = MODE_RAD, MODE_RAD = MODE_NONE)
 	var/mode = MODE_NONE
@@ -32,14 +31,13 @@
 	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
-			lighting_alpha = LIGHTING_PLANE_ALPHA_MOSTLY_VISIBLE
-
-		if(MODE_TRAY) //undoes the last mode, meson
-			vision_flags = NONE
-			lighting_alpha = null
+	if(mode == MODE_MESON)
+		if(!HAS_TRAIT_FROM(user, TRAIT_MESON_VISION, "meson_glasses[UID()]"))
+			ADD_TRAIT(user, TRAIT_MESON_VISION, "meson_glasses[UID()]")
+		active_on_equip = TRUE
+	else
+		REMOVE_TRAIT(user, TRAIT_MESON_VISION, "meson_glasses[UID()]")
+		active_on_equip = FALSE
 
 	if(ishuman(user))
 		var/mob/living/carbon/human/H = user

code/modules/clothing/glasses/glasses.dm

@@ -74,8 +74,6 @@
 	icon_state = "meson"
 	item_state = "meson"
 	origin_tech = "magnets=1;engineering=2"
-	vision_flags = SEE_TURFS
-	lighting_alpha = LIGHTING_PLANE_ALPHA_MOSTLY_VISIBLE
 	prescription_upgradable = TRUE
 
 	sprite_sheets = list(
@@ -86,6 +84,18 @@
 		"Kidan" = 'icons/mob/clothing/species/kidan/eyes.dmi'
 		)
 
+	var/active_on_equip = TRUE
+
+/obj/item/clothing/glasses/meson/equipped(mob/user, slot, initial)
+	. = ..()
+	if(active_on_equip && slot == slot_glasses)
+		ADD_TRAIT(user, TRAIT_MESON_VISION, "meson_glasses[UID()]")
+
+/obj/item/clothing/glasses/meson/dropped(mob/user)
+	. = ..()
+	if(user)
+		REMOVE_TRAIT(user, TRAIT_MESON_VISION, "meson_glasses[UID()]")
+
 /obj/item/clothing/glasses/meson/night
 	name = "night vision optical meson scanner"
 	desc = "An optical meson scanner fitted with an amplified visible light spectrum overlay, providing greater visual clarity in darkness."

code/modules/clothing/head/helmet.dm

@@ -54,7 +54,16 @@
 	name = "meson visor helmet"
 	desc = "A helmet with a built-in meson scanning visor."
 	icon_state = "helmetmesons"
-	vision_flags = SEE_TURFS
+
+/obj/item/clothing/head/helmet/meson/equipped(mob/user, slot, initial)
+	. = ..()
+	if(slot == slot_head)
+		ADD_TRAIT(user, TRAIT_MESON_VISION, "meson_helmet[UID()]")
+
+/obj/item/clothing/head/helmet/meson/dropped(mob/user)
+	. = ..()
+	if(user)
+		REMOVE_TRAIT(user, TRAIT_MESON_VISION, "meson_helmet[UID()]")
 
 /obj/item/clothing/head/helmet/material
 	name = "material visor helmet"