/*
Every cycle, the pump uses the air in air_in to try and make air_out the perfect pressure.

node1, air1, network1 correspond to input
node2, air2, network2 correspond to output

Thus, the two variables affect pump operation are set in New():
	air1.volume
		This is the volume of gas available to the pump that may be transfered to the output
	air2.volume
		Higher quantities of this cause more air to be perfected later
			but overall network volume is also increased as this increases...
*/

/obj/machinery/atmospherics/binary/pump
	name = "gas pump"
	desc = "A pump."
	desc_info = "This moves gas from one pipe to another.  A higher target pressure demands more energy.  The side with the red end is the output."
	icon = 'icons/atmos/pump.dmi'
	icon_state = "map_off"
	level = 1

	var/target_pressure = ONE_ATMOSPHERE

	//var/max_volume_transfer = 10000

	use_power = 0
	idle_power_usage = 150		//internal circuitry, friction losses and stuff
	power_rating = 7500			//7500 W ~ 10 HP

	var/max_pressure_setting = 15000	//kPa

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

	var/broadcast_status_next_process = FALSE

/obj/machinery/atmospherics/binary/pump/Initialize()
	. = ..()
	air1.volume = ATMOS_DEFAULT_VOLUME_PUMP
	air2.volume = ATMOS_DEFAULT_VOLUME_PUMP

/obj/machinery/atmospherics/binary/pump/on
	icon_state = "map_on"
	use_power = 1


/obj/machinery/atmospherics/binary/pump/update_icon()
	if(!powered())
		icon_state = "off"
	else
		icon_state = "[use_power ? "on" : "off"]"

/obj/machinery/atmospherics/binary/pump/update_underlays()
	if(..())
		underlays.Cut()
		var/turf/T = get_turf(src)
		if(!istype(T))
			return
		add_underlay(T, node1, turn(dir, -180))
		add_underlay(T, node2, dir)

/obj/machinery/atmospherics/binary/pump/hide(var/i)
	update_underlays()

/obj/machinery/atmospherics/binary/pump/machinery_process()
	last_power_draw = 0
	last_flow_rate = 0

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

	if (broadcast_status_next_process)
		broadcast_status()
		broadcast_status_next_process = FALSE

	var/power_draw = -1
	var/pressure_delta = target_pressure - air2.return_pressure()

	if(pressure_delta > 0.01 && air1.temperature > 0)
		//Figure out how much gas to transfer to meet the target pressure.
		var/transfer_moles = calculate_transfer_moles(air1, air2, pressure_delta, (network2)? network2.volume : 0)
		power_draw = pump_gas(src, air1, air2, transfer_moles, power_rating)

	if (power_draw >= 0)
		last_power_draw = power_draw
		use_power(power_draw)

		if(network1)
			network1.update = 1

		if(network2)
			network2.update = 1

	return 1

//Radio remote control

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

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

	var/datum/signal/signal = new
	signal.transmission_method = TRANSMISSION_RADIO
	signal.source = src

	signal.data = list(
		"tag" = id,
		"device" = "AGP",
		"power" = use_power,
		"target_output" = target_pressure,
		"sigtype" = "status"
	)

	radio_connection.post_signal(src, signal, filter = RADIO_ATMOSIA)

	return 1

/obj/machinery/atmospherics/binary/pump/ui_interact(mob/user, ui_key = "main", var/datum/nanoui/ui = null, var/force_open = 1)
	if(stat & (BROKEN|NOPOWER))
		return

	// this is the data which will be sent to the ui
	var/data[0]

	data = list(
		"on" = use_power,
		"pressure_set" = round(target_pressure*100),	//Nano UI can't handle rounded non-integers, apparently.
		"max_pressure" = max_pressure_setting,
		"last_flow_rate" = round(last_flow_rate*10),
		"last_power_draw" = round(last_power_draw),
		"max_power_draw" = power_rating
	)

	// update the ui if it exists, returns null if no ui is passed/found
	ui = SSnanoui.try_update_ui(user, src, ui_key, ui, data, force_open)
	if (!ui)
		// the ui does not exist, so we'll create a new() one
		// for a list of parameters and their descriptions see the code docs in \code\modules\nano\nanoui.dm
		ui = new(user, src, ui_key, "gas_pump.tmpl", name, 470, 290)
		ui.set_initial_data(data)	// when the ui is first opened this is the data it will use
		ui.open()					// open the new ui window
		ui.set_auto_update(1)		// auto update every Master Controller tick

/obj/machinery/atmospherics/binary/pump/atmos_init()
	..()
	if(frequency)
		set_frequency(frequency)

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

	if(signal.data["power"])
		if(text2num(signal.data["power"]))
			use_power = 1
		else
			use_power = 0

	if("power_toggle" in signal.data)
		use_power = !use_power

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

	if(signal.data["status"])
		broadcast_status_next_process = TRUE
		return //do not update_icon

	broadcast_status_next_process = TRUE
	update_icon()

/obj/machinery/atmospherics/binary/pump/attack_hand(user as mob)
	if(..())
		return
	src.add_fingerprint(usr)
	if(!src.allowed(user))
		to_chat(user, "<span class='warning'>Access denied.</span>")
		return
	usr.set_machine(src)
	ui_interact(user)
	return

/obj/machinery/atmospherics/binary/pump/Topic(href,href_list)
	if(..()) return 1

	if(href_list["power"])
		use_power = !use_power

	switch(href_list["set_press"])
		if ("min")
			target_pressure = 0
		if ("max")
			target_pressure = max_pressure_setting
		if ("set")
			var/new_pressure = input(usr,"Enter new output pressure (0-[max_pressure_setting]kPa)","Pressure control",src.target_pressure) as num
			src.target_pressure = between(0, new_pressure, max_pressure_setting)

	usr.set_machine(src)
	src.add_fingerprint(usr)

	src.update_icon()

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

/obj/machinery/atmospherics/binary/pump/attackby(var/obj/item/W as obj, var/mob/user as mob)
	if (!W.iswrench() && !istype(W, /obj/item/pipewrench))
		return ..()
	if (!(stat & NOPOWER) && use_power)
		to_chat(user, "<span class='warning'>You cannot unwrench this [src], turn it off first.</span>")
		return 1
	var/datum/gas_mixture/int_air = return_air()
	var/datum/gas_mixture/env_air = loc.return_air()
	if ((int_air.return_pressure()-env_air.return_pressure()) > 2*ONE_ATMOSPHERE && !istype(W, /obj/item/pipewrench))
		to_chat(user, "<span class='warning'>You cannot unwrench this [src], it's too exerted due to internal pressure.</span>")
		add_fingerprint(user)
		return 1
	else
		to_chat(user, "<span class='warning'>You struggle to unwrench \the [src] with your pipe wrench.</span>")
	playsound(src.loc, W.usesound, 50, 1)
	to_chat(user, "<span class='notice'>You begin to unfasten \the [src]...</span>")
	if (do_after(user, istype(W, /obj/item/pipewrench) ? 80/W.toolspeed : 40/W.toolspeed, 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)