/*
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/components/binary/pump
	icon_state = "pump_map"
	name = "gas pump"
	desc = "A pump that moves gas by pressure."

	can_unwrench = TRUE

	var/target_pressure = ONE_ATMOSPHERE

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

	construction_type = /obj/item/pipe/directional
	pipe_state = "pump"

/obj/machinery/atmospherics/components/binary/pump/layer1
	piping_layer = PIPING_LAYER_MIN
	pixel_x = -PIPING_LAYER_P_X
	pixel_y = -PIPING_LAYER_P_Y

/obj/machinery/atmospherics/components/binary/pump/layer3
	piping_layer = PIPING_LAYER_MAX
	pixel_x = PIPING_LAYER_P_X
	pixel_y = PIPING_LAYER_P_Y

/obj/machinery/atmospherics/components/binary/pump/on
	on = TRUE
	icon_state = "pump_on_map"

/obj/machinery/atmospherics/components/binary/pump/on/layer1
	piping_layer = PIPING_LAYER_MIN
	pixel_x = -PIPING_LAYER_P_X
	pixel_y = -PIPING_LAYER_P_Y

/obj/machinery/atmospherics/components/binary/pump/on/layer3
	piping_layer = PIPING_LAYER_MAX
	pixel_x = PIPING_LAYER_P_X
	pixel_y = PIPING_LAYER_P_Y

/obj/machinery/atmospherics/components/binary/pump/Destroy()
	SSradio.remove_object(src,frequency)
	if(radio_connection)
		radio_connection = null
	return ..()

/obj/machinery/atmospherics/components/binary/pump/update_icon_nopipes()
	if(!is_operational())
		icon_state = "pump_off"
		return

	icon_state = "pump_[on?"on":"off"]"

/obj/machinery/atmospherics/components/binary/pump/process_atmos()
//	..()
	if(!on || !is_operational())
		return

	var/datum/gas_mixture/air1 = airs[1]
	var/datum/gas_mixture/air2 = airs[2]

	var/output_starting_pressure = air2.return_pressure()

	if((target_pressure - output_starting_pressure) < 0.01)
		//No need to pump gas if target is already reached!
		return

	//Calculate necessary moles to transfer using PV=nRT
	if((air1.total_moles() > 0) && (air1.temperature>0))
		var/pressure_delta = target_pressure - output_starting_pressure
		var/transfer_moles = pressure_delta*air2.volume/(air1.temperature * R_IDEAL_GAS_EQUATION)

		//Actually transfer the gas
		var/datum/gas_mixture/removed = air1.remove(transfer_moles)
		air2.merge(removed)

		update_parents()

//Radio remote control
/obj/machinery/atmospherics/components/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/components/binary/pump/proc/broadcast_status()
	if(!radio_connection)
		return

	var/datum/signal/signal = new(list(
		"tag" = id,
		"device" = "AGP",
		"power" = on,
		"target_output" = target_pressure,
		"sigtype" = "status"
	))
	radio_connection.post_signal(src, signal, filter = RADIO_ATMOSIA)

/obj/machinery/atmospherics/components/binary/pump/ui_interact(mob/user, ui_key = "main", datum/tgui/ui = null, force_open = FALSE, \
																datum/tgui/master_ui = null, datum/ui_state/state = GLOB.default_state)
	ui = SStgui.try_update_ui(user, src, ui_key, ui, force_open)
	if(!ui)
		ui = new(user, src, ui_key, "atmos_pump", name, 335, 115, master_ui, state)
		ui.open()

/obj/machinery/atmospherics/components/binary/pump/ui_data()
	var/data = list()
	data["on"] = on
	data["pressure"] = round(target_pressure)
	data["max_pressure"] = round(MAX_OUTPUT_PRESSURE)
	return data

/obj/machinery/atmospherics/components/binary/pump/ui_act(action, params)
	if(..())
		return
	var/turf/T = get_turf(src)
	var/area/A = get_area(src)
	switch(action)
		if("power")
			on = !on
			message_admins("Pump, [src.name], turned [on ? "on" : "off"] by [ADMIN_LOOKUPFLW(usr)] at [ADMIN_COORDJMP(T)], [A]")
			investigate_log("was turned [on ? "on" : "off"] by [key_name(usr)]", INVESTIGATE_ATMOS)
			. = TRUE
		if("pressure")
			var/pressure = params["pressure"]
			if(pressure == "max")
				pressure = MAX_OUTPUT_PRESSURE
				. = TRUE
			else if(pressure == "input")
				pressure = input("New output pressure (0-[MAX_OUTPUT_PRESSURE] kPa):", name, target_pressure) as num|null
				if(!isnull(pressure) && !..())
					. = TRUE
			else if(text2num(pressure) != null)
				pressure = text2num(pressure)
				. = TRUE
			if(.)
				target_pressure = CLAMP(pressure, 0, MAX_OUTPUT_PRESSURE)
				investigate_log("was set to [target_pressure] kPa by [key_name(usr)]", INVESTIGATE_ATMOS)
	update_icon()

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

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

	var/old_on = on //for logging

	if("power" in signal.data)
		on = text2num(signal.data["power"])

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

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

	if(on != old_on)
		investigate_log("was turned [on ? "on" : "off"] by a remote signal", INVESTIGATE_ATMOS)

	if("status" in signal.data)
		broadcast_status()
		return

	broadcast_status()
	update_icon()

/obj/machinery/atmospherics/components/binary/pump/power_change()
	..()
	update_icon()

/obj/machinery/atmospherics/components/binary/pump/can_unwrench(mob/user)
	. = ..()
	var/area/A = get_area(src)
	if(. && on && is_operational())
		to_chat(user, "<span class='warning'>You cannot unwrench [src], turn it off first!</span>")
		return FALSE
	else
		investigate_log("Pump, [src.name], was unwrenched by [key_name(usr)] at [x], [y], [z], [A]", INVESTIGATE_ATMOS)
		message_admins("Pump, [src.name], was unwrenched by [ADMIN_LOOKUPFLW(user)] at [A]")
		return TRUE