//--------------------------------------------
// Base omni device
//--------------------------------------------
/obj/machinery/atmospherics/omni
	name = "omni device"
	icon = 'icons/atmos/omni_devices.dmi'
	icon_state = "base"
	use_power = 1
	initialize_directions = 0
	level = 1

	var/configuring = 0
	//var/target_pressure = ONE_ATMOSPHERE	//a base type as abstract as this should NOT be making these kinds of assumptions

	var/base_icon

	var/tag_north = ATM_NONE
	var/tag_south = ATM_NONE
	var/tag_east = ATM_NONE
	var/tag_west = ATM_NONE

	var/list/on_states = list()
	var/list/off_states = list()

	var/underlays_current[4]

	var/list/ports = new()

/obj/machinery/atmospherics/omni/Initialize()
	icon_state = "base"
	ports = new()
	for(var/d in cardinal)
		var/datum/omni_port/new_port = new(src, d)
		switch(d)
			if(NORTH)
				new_port.mode = tag_north
			if(SOUTH)
				new_port.mode = tag_south
			if(EAST)
				new_port.mode = tag_east
			if(WEST)
				new_port.mode = tag_west
		if(new_port.mode > 0)
			initialize_directions |= d
		ports += new_port
	. = ..()

/obj/machinery/atmospherics/omni/update_icon()
	cut_overlays()
	var/list/to_add = list(base_icon)
	if(stat & NOPOWER)
		to_add += off_states
	else if(error_check())
		to_add += "error"
	else if (use_power)
		to_add[1] = "[base_icon]_glow"
		to_add += on_states
	else
		to_add += off_states

	add_overlay(to_add)

	underlays = underlays_current

/obj/machinery/atmospherics/omni/proc/error_check()
	return

/obj/machinery/atmospherics/omni/machinery_process()
	last_power_draw = 0
	last_flow_rate = 0

	if(error_check())
		use_power = 0

	if((stat & (NOPOWER|BROKEN)) || !use_power)
		return 0
	return 1

/obj/machinery/atmospherics/omni/power_change()
	var/old_stat = stat
	..()
	if(old_stat != stat)
		update_icon()

/obj/machinery/atmospherics/omni/attackby(var/obj/item/weapon/W as obj, var/mob/user as mob)
	if(!iswrench(W))
		return ..()

	var/int_pressure = 0
	for(var/datum/omni_port/P in ports)
		int_pressure += P.air.return_pressure()
	var/datum/gas_mixture/env_air = loc.return_air()
	if ((int_pressure - env_air.return_pressure()) > 2*ONE_ATMOSPHERE)
		user << "<span class='warning'>You cannot unwrench \the [src], it is too exerted due to internal pressure.</span>"
		add_fingerprint(user)
		return 1
	user << "<span class='notice'>You begin to unfasten \the [src]...</span>"
	playsound(src.loc, 'sound/items/Ratchet.ogg', 50, 1)
	if(do_after(user, 40, act_target = src))
		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)
		qdel(src)

/obj/machinery/atmospherics/omni/attack_hand(user as mob)
	if(..())
		return

	src.add_fingerprint(usr)
	ui_interact(user)
	return

/obj/machinery/atmospherics/omni/proc/update_port_icons()
	if(!check_icon_cache())
		return
	
	on_states.Cut()
	off_states.Cut()

	for(var/datum/omni_port/P in ports)
		var/ref_layer = 0
		switch(P.dir)
			if(NORTH)
				ref_layer = 1
			if(SOUTH)
				ref_layer = 2
			if(EAST)
				ref_layer = 3
			if(WEST)
				ref_layer = 4

		if(!ref_layer)
			continue

		var/list/underlay_icon = select_port_icons(P)
		if(underlay_icon)
			if(P.node)
				underlays_current[ref_layer] = underlay_icon
			else
				underlays_current[ref_layer] = null
		else
			underlays_current[ref_layer] = null

	update_icon()

// Assumes on_states and off_states have been cut if required.
/obj/machinery/atmospherics/omni/proc/select_port_icons(datum/omni_port/P)
	if(!istype(P))
		return

	if(P.mode > 0)
		var/ic_dir = dir_name(P.dir)
		var/ic_on = ic_dir
		var/ic_off = ic_dir
		switch(P.mode)
			if(ATM_INPUT)
				ic_on += "_in_glow"
				ic_off += "_in"
			if(ATM_OUTPUT)
				ic_on += "_out_glow"
				ic_off += "_out"
			if(ATM_O2 to ATM_N2O)
				ic_on += "_filter"
				ic_off += "_out"

		on_states += ic_on
		off_states += ic_off

		var/turf/T = get_turf(src)
		if(!istype(T))
			return
		if(!T.is_plating() && istype(P.node, /obj/machinery/atmospherics/pipe) && P.node.level == 1 )
			. = icon_manager.get_atmos_icon("underlay", P.dir, color_cache_name(P.node), "down")
		else
			. = icon_manager.get_atmos_icon("underlay", P.dir, color_cache_name(P.node), "intact")

/obj/machinery/atmospherics/omni/update_underlays()
	for(var/datum/omni_port/P in ports)
		P.update = 1
	update_ports()

/obj/machinery/atmospherics/omni/hide(var/i)
	update_underlays()

/obj/machinery/atmospherics/omni/proc/update_ports()
	sort_ports()
	update_port_icons()
	for(var/datum/omni_port/P in ports)
		P.update = 0

/obj/machinery/atmospherics/omni/proc/sort_ports()
	return


// Housekeeping and pipe network stuff below

/obj/machinery/atmospherics/omni/network_expand(datum/pipe_network/new_network, obj/machinery/atmospherics/pipe/reference)
	for(var/datum/omni_port/P in ports)
		if(reference == P.node)
			P.network = new_network
			break

	if(new_network.normal_members.Find(src))
		return 0

	new_network.normal_members += src

	return null

/obj/machinery/atmospherics/omni/Destroy()
	loc = null

	for(var/datum/omni_port/P in ports)
		if(P.node)
			P.node.disconnect(src)
			qdel(P.network)
			P.node = null

	return ..()

/obj/machinery/atmospherics/omni/atmos_init()
	for(var/datum/omni_port/P in ports)
		if(P.node || P.mode == 0)
			continue
		for(var/obj/machinery/atmospherics/target in get_step(src, P.dir))
			if(target.initialize_directions & get_dir(target,src))
				if (check_connect_types(target,src))
					P.node = target
					break

	for(var/datum/omni_port/P in ports)
		P.update = 1

	update_ports()

/obj/machinery/atmospherics/omni/build_network()
	for(var/datum/omni_port/P in ports)
		if(!P.network && P.node)
			P.network = new /datum/pipe_network()
			P.network.normal_members += src
			P.network.build_network(P.node, src)

/obj/machinery/atmospherics/omni/return_network(obj/machinery/atmospherics/reference)
	build_network()

	for(var/datum/omni_port/P in ports)
		if(reference == P.node)
			return P.network

	return null

/obj/machinery/atmospherics/omni/reassign_network(datum/pipe_network/old_network, datum/pipe_network/new_network)
	for(var/datum/omni_port/P in ports)
		if(P.network == old_network)
			P.network = new_network

	return 1

/obj/machinery/atmospherics/omni/return_network_air(datum/pipe_network/reference)
	var/list/results = list()

	for(var/datum/omni_port/P in ports)
		if(P.network == reference)
			results += P.air

	return results

/obj/machinery/atmospherics/omni/disconnect(obj/machinery/atmospherics/reference)
	for(var/datum/omni_port/P in ports)
		if(reference == P.node)
			qdel(P.network)
			P.node = null
			P.update = 1
			break

	update_ports()

	return null