CHOMPStation2/code/ATMOSPHERICS/components/binary_devices/dp_vent_pump.dm

/obj/machinery/atmospherics/binary/dp_vent_pump
	icon = 'icons/atmos/vent_pump.dmi'
	icon_state = "map_dp_vent"

	//node2 is output port
	//node1 is input port

	name = "Dual Port Air Vent"
	desc = "Has a valve and pump attached to it. There are two ports."

	level = 1

	var/on = 0
	var/pump_direction = 1 //0 = siphoning, 1 = releasing

	var/external_pressure_bound = ONE_ATMOSPHERE
	var/input_pressure_min = 0
	var/output_pressure_max = 0

	var/frequency = 0
	var/id = null
	var/datum/radio_frequency/radio_connection

	var/pressure_checks = 1
	//1: Do not pass external_pressure_bound
	//2: Do not pass input_pressure_min
	//4: Do not pass output_pressure_max

/obj/machinery/atmospherics/binary/dp_vent_pump/New()
	..()
	icon = null

/obj/machinery/atmospherics/binary/dp_vent_pump/high_volume
	name = "Large Dual Port Air Vent"

/obj/machinery/atmospherics/binary/dp_vent_pump/high_volume/New()
	..()
	air1.volume = 1000
	air2.volume = 1000

/obj/machinery/atmospherics/binary/dp_vent_pump/update_icon(var/safety = 0)
	if(!check_icon_cache())
		return

	overlays.Cut()
	
	var/vent_icon = "vent"

	var/turf/T = get_turf(src)
	if(!istype(T))
		return

	if(T.intact && node1 && node2 && node1.level == 1 && node2.level == 1 && istype(node1, /obj/machinery/atmospherics/pipe) && istype(node2, /obj/machinery/atmospherics/pipe))
		vent_icon += "h"
		
	if(!powered())
		vent_icon += "off"
	else
		vent_icon += "[on ? "[pump_direction ? "out" : "in"]" : "off"]"

	overlays += icon_manager.get_atmos_icon("device", , , vent_icon)

/obj/machinery/atmospherics/binary/dp_vent_pump/update_underlays()
	if(..())
		underlays.Cut()
		var/turf/T = get_turf(src)
		if(!istype(T))
			return
		if(T.intact && node1 && node2 && node1.level == 1 && node2.level == 1 && istype(node1, /obj/machinery/atmospherics/pipe) && istype(node2, /obj/machinery/atmospherics/pipe))
			return
		else
			add_underlay(T, node1, turn(dir, -180))
			add_underlay(T, node2, dir)

/obj/machinery/atmospherics/binary/dp_vent_pump/hide(var/i)
	update_icon()
	update_underlays()

/obj/machinery/atmospherics/binary/dp_vent_pump/process()
	..()

	if(!on)
		return 0

	var/datum/gas_mixture/environment = loc.return_air()
	var/environment_pressure = environment.return_pressure()

	if(pump_direction) //input -> external
		var/pressure_delta = 10000

		if(pressure_checks&1)
			pressure_delta = min(pressure_delta, (external_pressure_bound - environment_pressure))
		if(pressure_checks&2)
			pressure_delta = min(pressure_delta, (air1.return_pressure() - input_pressure_min))

		if(pressure_delta > 0)
			if(air1.temperature > 0)
				var/transfer_moles = pressure_delta*environment.volume/(air1.temperature * R_IDEAL_GAS_EQUATION)

				var/datum/gas_mixture/removed = air1.remove(transfer_moles)

				loc.assume_air(removed)

				if(network1)
					network1.update = 1

	else //external -> output
		var/pressure_delta = 10000

		if(pressure_checks&1)
			pressure_delta = min(pressure_delta, (environment_pressure - external_pressure_bound))
		if(pressure_checks&4)
			pressure_delta = min(pressure_delta, (output_pressure_max - air2.return_pressure()))

		if(pressure_delta > 0)
			if(environment.temperature > 0)
				var/transfer_moles = pressure_delta*air2.volume/(environment.temperature * R_IDEAL_GAS_EQUATION)

				var/datum/gas_mixture/removed = loc.remove_air(transfer_moles)

				air2.merge(removed)

				if(network2)
					network2.update = 1

	return 1

	//Radio remote control

/obj/machinery/atmospherics/binary/dp_vent_pump/proc/set_frequency(new_frequency)
	radio_controller.remove_object(src, frequency)
	frequency = new_frequency
	if(frequency)
		radio_connection = radio_controller.add_object(src, frequency, filter = RADIO_ATMOSIA)

/obj/machinery/atmospherics/binary/dp_vent_pump/proc/broadcast_status()
	if(!radio_connection)
		return 0

	var/datum/signal/signal = new
	signal.transmission_method = 1 //radio signal
	signal.source = src

	signal.data = list(
		"tag" = id,
		"device" = "ADVP",
		"power" = on,
		"direction" = pump_direction?("release"):("siphon"),
		"checks" = pressure_checks,
		"input" = input_pressure_min,
		"output" = output_pressure_max,
		"external" = external_pressure_bound,
		"sigtype" = "status"
	)
	radio_connection.post_signal(src, signal, filter = RADIO_ATMOSIA)

	return 1

/obj/machinery/atmospherics/binary/dp_vent_pump/initialize()
	..()
	if(frequency)
		set_frequency(frequency)

/obj/machinery/atmospherics/binary/dp_vent_pump/receive_signal(datum/signal/signal)
	if(!signal.data["tag"] || (signal.data["tag"] != id) || (signal.data["sigtype"]!="command"))
		return 0
	if(signal.data["power"])
		on = text2num(signal.data["power"])

	if(signal.data["power_toggle"])
		on = !on

	if(signal.data["direction"])
		pump_direction = text2num(signal.data["direction"])

	if(signal.data["checks"])
		pressure_checks = text2num(signal.data["checks"])

	if(signal.data["purge"])
		pressure_checks &= ~1
		pump_direction = 0

	if(signal.data["stabalize"])
		pressure_checks |= 1
		pump_direction = 1

	if(signal.data["set_input_pressure"])
		input_pressure_min = between(
			0,
			text2num(signal.data["set_input_pressure"]),
			ONE_ATMOSPHERE*50
		)

	if(signal.data["set_output_pressure"])
		output_pressure_max = between(
			0,
			text2num(signal.data["set_output_pressure"]),
			ONE_ATMOSPHERE*50
		)

	if(signal.data["set_external_pressure"])
		external_pressure_bound = between(
			0,
			text2num(signal.data["set_external_pressure"]),
			ONE_ATMOSPHERE*50
		)

	if(signal.data["status"])
		spawn(2)
			broadcast_status()
		return //do not update_icon

	spawn(2)
		broadcast_status()
	update_icon()