//TODO: Put this under a common parent type with freezers to cut down on the copypasta
#define HEATER_PERF_MULT 2.5

/obj/machinery/atmospherics/unary/heater
	name = "gas heating system"
	desc = "Heats gas when connected to a pipe network."
	desc_info = "Heats up the gas of the pipe it is connected to.  It uses massive amounts of electricity while on. \
	It can be upgraded by replacing the capacitors, manipulators, and matter bins.  It can be deconstructed by screwing the maintenance panel open with a \
	screwdriver, and then using a crowbar."
	icon = 'icons/obj/sleeper.dmi'
	icon_state = "heater_0"
	density = 1
	anchored = 1
	use_power = 0
	idle_power_usage = 5			//5 Watts for thermostat related circuitry

	var/max_temperature = T20C + 680
	var/internal_volume = 600	//L

	var/max_power_rating = 20000	//power rating when the usage is turned up to 100
	var/power_setting = 100

	var/set_temperature = T20C	//thermostat
	var/heating = 0		//mainly for icon updates

	component_types = list(
		/obj/item/circuitboard/unary_atmos/heater,
		/obj/item/stock_parts/matter_bin,
		/obj/item/stock_parts/capacitor = 2,
		/obj/item/stack/cable_coil{amount = 5}
	)

/obj/machinery/atmospherics/unary/heater/Initialize()
	initialize_directions = dir
	. = ..()

/obj/machinery/atmospherics/unary/heater/atmos_init()
	if(node)
		return

	var/node_connect = dir

	//check that there is something to connect to
	for(var/obj/machinery/atmospherics/target in get_step(src, node_connect))
		if(target.initialize_directions & get_dir(target, src))
			node = target
			break

	//copied from pipe construction code since heaters/freezers don't use fittings and weren't doing this check - this all really really needs to be refactored someday.
	//check that there are no incompatible pipes/machinery in our own location
	for(var/obj/machinery/atmospherics/M in src.loc)
		if(M != src && (M.initialize_directions & node_connect) && M.check_connect_types(M,src))	// matches at least one direction on either type of pipe & same connection type
			node = null
			break

	update_icon()


/obj/machinery/atmospherics/unary/heater/update_icon()
	if(node)
		if(use_power && heating)
			icon_state = "heater_1"
		else
			icon_state = "heater"
	else
		icon_state = "heater_0"
	return


/obj/machinery/atmospherics/unary/heater/machinery_process()
	..()

	if(stat & (NOPOWER|BROKEN) || !use_power)
		heating = 0
		update_icon()
		return

	if(network && air_contents.total_moles && air_contents.temperature < set_temperature)
		air_contents.add_thermal_energy(power_rating * HEATER_PERF_MULT)
		use_power(power_rating)

		heating = 1
		network.update = 1
	else
		heating = 0

	update_icon()

/obj/machinery/atmospherics/unary/heater/attack_ai(mob/user as mob)
	ui_interact(user)

/obj/machinery/atmospherics/unary/heater/attack_hand(mob/user as mob)
	ui_interact(user)

/obj/machinery/atmospherics/unary/heater/ui_interact(mob/user)
	var/datum/vueui/ui = SSvueui.get_open_ui(user, src)
	if(!ui)
		ui = new(user, src, "machinery-atmospherics-freezer", 440, 300, "Gas Heating System")
		ui.auto_update_content = TRUE
	
	ui.open()

/obj/machinery/atmospherics/unary/heater/vueui_data_change(list/data, mob/user, datum/vueui/ui)
	data = list()

	data["on"] = use_power ? 1 : 0
	data["gasPressure"] = round(air_contents.return_pressure())
	data["gasTemperature"] = round(air_contents.temperature)
	data["minGasTemperature"] = 0
	data["maxGasTemperature"] = round(max_temperature)
	data["targetGasTemperature"] = round(set_temperature)
	data["powerSetting"] = power_setting

	data["gasTemperatureBadTop"] = (T20C+40)
	data["gasTemperatureBadBottom"] = null
	data["gasTemperatureAvgTop"] = null
	data["gasTemperatureAvgBottom"] = null

	return data

/obj/machinery/atmospherics/unary/heater/Topic(href, href_list)
	if(..())
		return 1
	if(href_list["toggleStatus"])
		use_power = !use_power
		update_icon()
	if(href_list["temp"])
		var/amount = text2num(href_list["temp"])
		if(amount > 0)
			set_temperature = min(set_temperature + amount, max_temperature)
		else
			set_temperature = max(set_temperature + amount, 0)
	if(href_list["setPower"]) //setting power to 0 is redundant anyways
		var/new_setting = between(0, text2num(href_list["setPower"]), 100)
		set_power_level(new_setting)

	add_fingerprint(usr)

//upgrading parts
/obj/machinery/atmospherics/unary/heater/RefreshParts()
	..()
	var/cap_rating = 0
	var/bin_rating = 0
	for(var/obj/item/stock_parts/P in component_parts)
		if(iscapacitor(P))
			cap_rating += P.rating
		else if(ismatterbin(P))
			bin_rating += P.rating

	max_power_rating = initial(max_power_rating) * cap_rating / 2
	max_temperature = max(initial(max_temperature) - T20C, 0) * ((bin_rating * 4 + cap_rating) / 5) + T20C
	air_contents.volume = max(initial(internal_volume) - 200, 0) + 200 * bin_rating
	set_power_level(power_setting)

/obj/machinery/atmospherics/unary/heater/proc/set_power_level(var/new_power_setting)
	power_setting = new_power_setting
	power_rating = max_power_rating * (power_setting/100)

/obj/machinery/atmospherics/unary/heater/attackby(var/obj/item/O as obj, var/mob/user as mob)
	if(default_deconstruction_screwdriver(user, O))
		return
	if(default_deconstruction_crowbar(user, O))
		return
	if(default_part_replacement(user, O))
		return

	..()

/obj/machinery/atmospherics/unary/heater/examine(mob/user)
	..(user)
	if(panel_open)
		to_chat(user, "The maintenance hatch is open.")