/*
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
	icon = 'icons/atmos/pump.dmi'
	icon_state = "map_off"
	level = 1

	name = "gas pump"
	desc = "A pump"

	var/on = 0
	var/target_pressure = ONE_ATMOSPHERE

	//var/max_volume_transfer = 10000

	use_power = 1
	idle_power_usage = 150		//internal circuitry, friction losses and stuff
	active_power_usage = 7500	//This also doubles as a measure of how powerful the pump is, in Watts. 7500 W ~ 10 HP

	var/last_power_draw = 0			//for UI
	var/max_pressure_setting = 15000	//kPa
	
	var/frequency = 0
	var/id = null
	var/datum/radio_frequency/radio_connection

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

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


/obj/machinery/atmospherics/binary/pump/update_icon()
	if(!powered())
		icon_state = "off"
	else
		icon_state = "[on ? "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/process()
	if((stat & (NOPOWER|BROKEN)) || !on)
		update_use_power(0)	//usually we get here because a player turned a pump off - definitely want to update.
		last_power_draw = 0
		last_flow_rate = 0
		return

	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/air_temperature = (air2.temperature > 0)? air2.temperature : air1.temperature
		var/output_volume = air2.volume + (network2? network2.volume : 0)
		
		//get the number of moles that would have to be transfered to bring sink to the target pressure
		var/transfer_moles = pressure_delta*output_volume/(air_temperature * R_IDEAL_GAS_EQUATION)
		
		power_draw = pump_gas(src, air1, air2, transfer_moles, active_power_usage)
	
	if (power_draw < 0)
		//update_use_power(0)
		use_power = 0	//don't force update - easier on CPU
		last_power_draw = 0
		last_flow_rate = 0
	else
		last_power_draw = handle_power_draw(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)
	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/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" = "AGP",
		"power" = on,
		"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" = on,
		"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" = active_power_usage,
	)

	// update the ui if it exists, returns null if no ui is passed/found
	ui = nanomanager.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/initialize()
	..()
	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"]))
			on = 1
		else
			on = 0

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

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

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

	spawn(2)
		broadcast_status()
	update_icon()
	return

/obj/machinery/atmospherics/binary/pump/attack_hand(user as mob)
	if(..())
		return
	src.add_fingerprint(usr)
	if(!src.allowed(user))
		user << "\red Access denied."
		return
	usr.set_machine(src)
	ui_interact(user)
	return

/obj/machinery/atmospherics/binary/pump/Topic(href,href_list)
	if(..()) return
	
	if(href_list["power"])
		on = !on
	
	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/weapon/W as obj, var/mob/user as mob)
	if (!istype(W, /obj/item/weapon/wrench))
		return ..()
	if (!(stat & NOPOWER) && on)
		user << "\red You cannot unwrench this [src], turn it off first."
		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)
		user << "\red You cannot unwrench this [src], it too exerted due to internal pressure."
		add_fingerprint(user)
		return 1
	playsound(src.loc, 'sound/items/Ratchet.ogg', 50, 1)
	user << "\blue You begin to unfasten \the [src]..."
	if (do_after(user, 40))
		user.visible_message( \
			"[user] unfastens \the [src].", \
			"\blue You have unfastened \the [src].", \
			"You hear ratchet.")
		new /obj/item/pipe(loc, make_from=src)
		del(src)