Watertank/Mister for Botany

code/game/objects/items/weapons/tanks/watertank.dm

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+/obj/item/weapon/watertank
+	name = "S.U.N.S.H.I.N.E. water sprayer"
+	desc = "A watertank backpack with nozzle to water plants."
+	icon = 'icons/obj/hydroponics.dmi'
+	icon_state = "waterbackpack"
+	item_state = "waterbackpack"
+	w_class = 4.0
+	slot_flags = SLOT_BACK
+	slowdown = 3
+	action_button_name = "Toggle Mister"
+
+	var/obj/item/weapon/reagent_containers/glass/mister/noz
+	var/on = 0
+	var/volume = 500
+
+/obj/item/weapon/watertank/New()
+	..()
+	create_reagents(volume)
+	return
+
+/obj/item/weapon/watertank/ui_action_click()
+	if (usr.get_item_by_slot(slot_back) == src)
+		toggle_mister()
+	else
+		usr << "<span class='notice'>The watertank needs to be on your back to use!</span>"
+	return
+
+/obj/item/weapon/watertank/verb/toggle_mister()
+	set name = "Toggle Mister"
+	set category = "Object"
+	on = !on
+	
+	var/mob/living/carbon/human/user = usr
+	if(on)
+		//Detach the nozzle into the user's hands
+		noz = new(src)
+		var/list/L = list("left hand" = slot_l_hand,"right hand" = slot_r_hand)
+		if(!user.equip_in_one_of_slots(noz, L))
+			on = 0
+			user << "<span class='notice'>You need a free hand to hold the mister!</span>"
+	else
+		//Remove from their hands and put back "into" the tank
+		remove_noz(user)
+	return
+
+/obj/item/weapon/watertank/equipped(mob/user, slot)
+	if (slot != slot_back)
+		remove_noz(user)
+
+/obj/item/weapon/watertank/proc/remove_noz(mob/user)
+	if (noz != null)
+		var/mob/living/carbon/human/M = user
+		M.u_equip(noz)
+	return
+
+/obj/item/weapon/watertank/Del()
+	if (noz)
+		var/M = get(noz, /mob)
+		remove_noz(M)
+	..()
+	return
+
+// This mister item is intended as an extension of the watertank and always attached to it.
+// Therefore, it's designed to be "locked" to the player's hands or extended back onto
+// the watertank backpack. Allowing it to be placed elsewhere or created without a parent
+// watertank object will likely lead to weird behaviour or runtimes.
+/obj/item/weapon/reagent_containers/glass/mister
+	name = "water mister"
+	desc = "A mister nozzle attached to a water tank."
+	icon = 'icons/obj/hydroponics.dmi'
+	icon_state = "mister"
+	item_state = "mister"
+	w_class = 4.0
+	amount_per_transfer_from_this = 50
+	possible_transfer_amounts = list(25,50,100)
+	volume = 500
+	can_be_placed_into = list()
+
+	var/obj/item/weapon/watertank/tank
+
+/obj/item/weapon/reagent_containers/glass/mister/New(parent_tank)
+	..()
+	if (!parent_tank || !istype(parent_tank, /obj/item/weapon/watertank))	//To avoid weird issues from admin spawns
+		var/mob/living/carbon/human/M = usr
+		M.u_equip(src)
+		Del()
+	else
+		tank = parent_tank
+		reagents = tank.reagents	//This mister is really just a proxy for the tank's reagents
+		return
+
+/obj/item/weapon/reagent_containers/glass/mister/dropped(mob/user as mob)
+	user << "<span class='notice'>The mister snaps back onto the watertank!</span>"
+	tank.on = 0
+	Del()