//
// Base type of pipes
//
/obj/machinery/atmospherics/pipe

	var/datum/gas_mixture/air_temporary // used when reconstructing a pipeline that broke
	var/datum/pipeline/parent
	var/volume = 0

	layer = 2.4 //under wires with their 2.44
	use_power = 0

	var/alert_pressure = 80*ONE_ATMOSPHERE
		//minimum pressure before check_pressure(...) should be called

	can_buckle = 1
	buckle_require_restraints = 1
	buckle_lying = -1

/obj/machinery/atmospherics/pipe/drain_power()
	return -1

/obj/machinery/atmospherics/pipe/New()
	if(istype(get_turf(src), /turf/simulated/wall) || istype(get_turf(src), /turf/simulated/shuttle/wall) || istype(get_turf(src), /turf/unsimulated/wall))
		level = 1
	..()

/obj/machinery/atmospherics/pipe/hides_under_flooring()
	return level != 2

/obj/machinery/atmospherics/pipe/proc/pipeline_expansion()
	return null

/obj/machinery/atmospherics/pipe/proc/check_pressure(pressure)
	//Return 1 if parent should continue checking other pipes
	//Return null if parent should stop checking other pipes. Recall: qdel(src) will by default return null

	return 1

/obj/machinery/atmospherics/pipe/return_air()
	if(!parent)
		parent = new /datum/pipeline()
		parent.build_pipeline(src)

	return parent.air

/obj/machinery/atmospherics/pipe/build_network()
	if(!parent)
		parent = new /datum/pipeline()
		parent.build_pipeline(src)

	return parent.return_network()

/obj/machinery/atmospherics/pipe/network_expand(datum/pipe_network/new_network, obj/machinery/atmospherics/pipe/reference)
	if(!parent)
		parent = new /datum/pipeline()
		parent.build_pipeline(src)

	return parent.network_expand(new_network, reference)

/obj/machinery/atmospherics/pipe/return_network(obj/machinery/atmospherics/reference)
	if(!parent)
		parent = new /datum/pipeline()
		parent.build_pipeline(src)

	return parent.return_network(reference)

/obj/machinery/atmospherics/pipe/Destroy()
	qdel_null(parent)
	if(air_temporary)
		loc.assume_air(air_temporary)

	. = ..()

/obj/machinery/atmospherics/pipe/attackby(var/obj/item/weapon/W as obj, var/mob/user as mob)
	if (istype(src, /obj/machinery/atmospherics/pipe/tank))
		return ..()

	if(istype(W,/obj/item/device/pipe_painter))
		return 0

	if (!istype(W, /obj/item/weapon/wrench))
		return ..()
	var/turf/T = src.loc
	if (level==1 && isturf(T) && !T.is_plating())
		to_chat(user, "<span class='warning'>You must remove the plating first.</span>")
		return 1
	if(!can_unwrench())
		to_chat(user, "<span class='warning'>You cannot unwrench \the [src], it is too exerted due to internal pressure.</span>")
		add_fingerprint(user)
		return 1
	playsound(src, W.usesound, 50, 1)
	to_chat(user, "<span class='notice'>You begin to unfasten \the [src]...</span>")
	if (do_after(user, 40 * W.toolspeed))
		user.visible_message( \
			"<span class='notice'>\The [user] unfastens \the [src].</span>", \
			"<span class='notice'>You have unfastened \the [src].</span>", \
			"You hear a ratchet.")
		new /obj/item/pipe(loc, make_from=src)
		for (var/obj/machinery/meter/meter in T)
			if (meter.target == src)
				new /obj/item/pipe_meter(T)
				qdel(meter)
		qdel(src)

/obj/machinery/atmospherics/pipe/proc/change_color(var/new_color)
	//only pass valid pipe colors please ~otherwise your pipe will turn invisible
	if(!pipe_color_check(new_color))
		return

	pipe_color = new_color
	update_icon()

/obj/machinery/atmospherics/pipe/color_cache_name(var/obj/machinery/atmospherics/node)
	if(istype(src, /obj/machinery/atmospherics/pipe/tank))
		return ..()

	if(istype(node, /obj/machinery/atmospherics/pipe/manifold) || istype(node, /obj/machinery/atmospherics/pipe/manifold4w))
		if(pipe_color == node.pipe_color)
			return node.pipe_color
		else
			return null
	else if(istype(node, /obj/machinery/atmospherics/pipe/simple))
		return node.pipe_color
	else
		return pipe_color

/obj/machinery/atmospherics/pipe/hide(var/i)
	if(istype(loc, /turf/simulated))
		invisibility = i ? 101 : 0
	update_icon()

/obj/machinery/atmospherics/pipe/process()
	if(!parent) //This should cut back on the overhead calling build_network thousands of times per cycle
		..()
	else
		. = PROCESS_KILL