#define waypoint_sector(waypoint) get_overmap_sector(get_z(waypoint))

/datum/shuttle/autodock/overmap
	warmup_time = 10

	var/range = 0	//how many overmap tiles can shuttle go, for picking destinations and returning.
	var/fuel_consumption = 0 //Amount of moles of gas consumed per trip; If zero, then shuttle is magic and does not need fuel
	var/list/obj/structure/fuel_port/fuel_ports //the fuel ports of the shuttle (but usually just one)
	var/obj/effect/overmap/visitable/ship/landable/myship //my overmap ship object

	category = /datum/shuttle/autodock/overmap

/datum/shuttle/autodock/overmap/New(var/_name, var/obj/effect/shuttle_landmark/start_waypoint)
	..(_name, start_waypoint)
	refresh_fuel_ports_list()

/datum/shuttle/autodock/overmap/Destroy()
	. = ..()
	myship = null

/datum/shuttle/autodock/overmap/proc/refresh_fuel_ports_list() //loop through all
	fuel_ports = list()
	for(var/area/A in shuttle_area)
		for(var/obj/structure/fuel_port/fuel_port_in_area in A)
			fuel_port_in_area.parent_shuttle = src
			fuel_ports += fuel_port_in_area

/datum/shuttle/autodock/overmap/fuel_check()
	if(!src.try_consume_fuel()) //insufficient fuel
		for(var/area/A in shuttle_area)
			for(var/mob/living/M in A)
				M.show_message("<spawn class='warning'>You hear the shuttle engines sputter... perhaps it doesn't have enough fuel?", 1,
				"<spawn class='warning'>The shuttle shakes but fails to take off.", 2)
				return 0 //failure!
	return 1 //sucess, continue with launch

/datum/shuttle/autodock/overmap/proc/can_go()
	if(!next_location)
		return FALSE
	if(moving_status == SHUTTLE_INTRANSIT)
		return FALSE //already going somewhere, current_location may be an intransit location instead of in a sector
	var/our_sector = waypoint_sector(current_location)
	if(myship?.landmark && next_location == myship.landmark)
		return TRUE //We're not on the overmap yet (admin spawned probably), and we're trying to hook up with our openspace sector
	return get_dist(our_sector, waypoint_sector(next_location)) <= range

/datum/shuttle/autodock/overmap/can_launch()
	return ..() && can_go()

/datum/shuttle/autodock/overmap/can_force()
	return ..() && can_go()

/datum/shuttle/autodock/overmap/get_travel_time()
	var/distance_mod = get_dist(waypoint_sector(current_location),waypoint_sector(next_location))
	return move_time * (1 + distance_mod)

/datum/shuttle/autodock/overmap/proc/set_destination(var/obj/effect/shuttle_landmark/A)
	if(A != current_location)
		next_location = A

/datum/shuttle/autodock/overmap/proc/get_possible_destinations()
	var/list/res = list()
	var/our_sector = waypoint_sector(current_location)
	if(!our_sector && myship?.landmark)
		res["Perform Test Jump"] = myship.landmark
		return res //We're not on the overmap, maybe an admin spawned us on a non-sector map. We're broken until we connect to our space z-level.
	for (var/obj/effect/overmap/visitable/S in range(get_turf(our_sector), range))
		var/list/waypoints = S.get_waypoints(name)
		for(var/obj/effect/shuttle_landmark/LZ in waypoints)
			if(LZ.is_valid(src))
				res["[waypoints[LZ]] - [LZ.name]"] = LZ
	return res

/datum/shuttle/autodock/overmap/get_location_name()
	if(moving_status == SHUTTLE_INTRANSIT)
		return "In transit"
	return "[waypoint_sector(current_location)] - [current_location]"

/datum/shuttle/autodock/overmap/get_destination_name()
	if(!next_location)
		return "None"
	return "[waypoint_sector(next_location)] - [next_location]"

/datum/shuttle/autodock/overmap/proc/try_consume_fuel() //returns 1 if sucessful, returns 0 if error (like insufficient fuel)
	if(!fuel_consumption)
		return 1 //shuttles with zero fuel consumption are magic and can always launch
	if(!fuel_ports.len)
		return 0 //Nowhere to get fuel from
	var/list/obj/item/tank/fuel_tanks = list()
	for(var/obj/structure/FP in fuel_ports) //loop through fuel ports and assemble list of all fuel tanks
		var/obj/item/tank/FT = locate() in FP
		if(FT)
			fuel_tanks += FT
	if(!fuel_tanks.len)
		return 0 //can't launch if you have no fuel TANKS in the ports
	var/total_flammable_gas_moles = 0
	for(var/obj/item/tank/FT in fuel_tanks)
		total_flammable_gas_moles += FT.air_contents.get_by_flag(XGM_GAS_FUEL)
	if(total_flammable_gas_moles < fuel_consumption) //not enough fuel
		return 0
	// We are going to succeed if we got to here, so start consuming that fuel
	var/fuel_to_consume = fuel_consumption
	for(var/obj/item/tank/FT in fuel_tanks) //loop through tanks, consume their fuel one by one
		var/fuel_available = FT.air_contents.get_by_flag(XGM_GAS_FUEL)
		if(!fuel_available) // Didn't even have fuel.
			continue
		if(fuel_available >= fuel_to_consume)
			FT.remove_air_by_flag(XGM_GAS_FUEL, fuel_to_consume)
			return 1 //ALL REQUIRED FUEL HAS BEEN CONSUMED, GO FOR LAUNCH!
		else //this tank doesn't have enough to launch shuttle by itself, so remove all its fuel, then continue loop
			fuel_to_consume -= fuel_available
			FT.remove_air_by_flag(XGM_GAS_FUEL, fuel_available)

/obj/structure/fuel_port
	name = "fuel port"
	desc = "The fuel input port of the shuttle. Holds one fuel tank. Use a crowbar to open and close it."
	icon = 'icons/turf/shuttle_parts.dmi'
	icon_state = "fuel_port"
	density = FALSE
	anchored = TRUE
	var/icon_closed = "fuel_port"
	var/icon_empty = "fuel_port_empty"
	var/icon_full = "fuel_port_full"
	var/opened = 0
	var/parent_shuttle
	var/base_tank = /obj/item/tank/phoron

/obj/structure/fuel_port/Initialize(mapload)
	. = ..()
	if(base_tank)
		new base_tank(src)

/obj/structure/fuel_port/heavy
	base_tank = /obj/item/tank/phoron/pressurized

/obj/structure/fuel_port/empty
	base_tank = null	//oops, no gas!
	opened = 1	//shows open so you can diagnose 'oops, no gas' easily
	icon_state = "fuel_port_empty"	//set the default state just to be safe

/obj/structure/fuel_port/attack_hand(mob/user as mob)
	if(!opened)
		to_chat(user, "<spawn class='notice'>The door is secured tightly. You'll need a crowbar to open it.")
		return
	else if(contents.len > 0)
		user.put_in_hands(contents[1])
	update_icon()

/obj/structure/fuel_port/update_icon()
	if(opened)
		if(contents.len > 0)
			icon_state = icon_full
		else
			icon_state = icon_empty
	else
		icon_state = icon_closed
	..()

/obj/structure/fuel_port/attackby(obj/item/W as obj, mob/user as mob)
	if(W.has_tool_quality(TOOL_CROWBAR))
		if(opened)
			to_chat(user, "<spawn class='notice'>You tightly shut \the [src] door.")
			playsound(src, 'sound/effects/locker_close.ogg', 25, 0, -3)
			opened = 0
		else
			to_chat(user, "<spawn class='notice'>You open up \the [src] door.")
			playsound(src, 'sound/effects/locker_open.ogg', 15, 1, -3)
			opened = 1
	else if(istype(W,/obj/item/tank))
		if(!opened)
			to_chat(user, "<spawn class='warning'>\The [src] door is still closed!")
			return
		if(contents.len == 0)
			user.unEquip(W, src)
			W.forceMove(src)
	update_icon()

// Walls hide stuff inside them, but we want to be visible.
/obj/structure/fuel_port/hide()
	return