var/datum/subsystem/shuttle/SSshuttle

/datum/subsystem/shuttle
	name = "Shuttles"
	wait = 10
	init_order = 3
	flags = SS_KEEP_TIMING|SS_NO_TICK_CHECK

	var/list/mobile = list()
	var/list/stationary = list()
	var/list/transit = list()

		//emergency shuttle stuff
	var/obj/docking_port/mobile/emergency/emergency
	var/obj/docking_port/mobile/emergency/backup/backup_shuttle
	var/emergencyCallTime = 6000	//time taken for emergency shuttle to reach the station when called (in deciseconds)
	var/emergencyDockTime = 1800	//time taken for emergency shuttle to leave again once it has docked (in deciseconds)
	var/emergencyEscapeTime = 1200	//time taken for emergency shuttle to reach a safe distance after leaving station (in deciseconds)
	var/area/emergencyLastCallLoc
	var/emergencyNoEscape

		//supply shuttle stuff
	var/obj/docking_port/mobile/supply/supply
	var/ordernum = 1					//order number given to next order
	var/points = 5000					//number of trade-points we have
	var/centcom_message = ""			//Remarks from Centcom on how well you checked the last order.
	var/list/discoveredPlants = list()	//Typepaths for unusual plants we've already sent CentComm, associated with their potencies

	var/list/supply_packs = list()
	var/list/shoppinglist = list()
	var/list/requestlist = list()
	var/list/orderhistory = list()

	var/datum/round_event/shuttle_loan/shuttle_loan

/datum/subsystem/shuttle/New()
	NEW_SS_GLOBAL(SSshuttle)

/datum/subsystem/shuttle/Initialize(timeofday)
	if(!emergency)
		WARNING("No /obj/docking_port/mobile/emergency placed on the map!")
	if(!backup_shuttle)
		WARNING("No /obj/docking_port/mobile/emergency/backup placed on the map!")
	if(!supply)
		WARNING("No /obj/docking_port/mobile/supply placed on the map!")

	ordernum = rand(1, 9000)

	for(var/pack in subtypesof(/datum/supply_pack))
		var/datum/supply_pack/P = new pack()
		if(!P.contains)
			continue
		supply_packs[P.type] = P

	initial_move()
	..()


/datum/subsystem/shuttle/fire()
	for(var/thing in mobile)
		if(thing)
			var/obj/docking_port/mobile/P = thing
			P.check()
			continue
		mobile.Remove(thing)

/datum/subsystem/shuttle/proc/getShuttle(id)
	for(var/obj/docking_port/mobile/M in mobile)
		if(M.id == id)
			return M
	WARNING("couldn't find shuttle with id: [id]")

/datum/subsystem/shuttle/proc/getDock(id)
	for(var/obj/docking_port/stationary/S in stationary)
		if(S.id == id)
			return S
	WARNING("couldn't find dock with id: [id]")

/datum/subsystem/shuttle/proc/requestEvac(mob/user, call_reason)
	if(!emergency)
		WARNING("requestEvac(): There is no emergency shuttle, but the \
			shuttle was called. Using the backup shuttle instead.")
		if(!backup_shuttle)
			throw EXCEPTION("requestEvac(): There is no emergency shuttle, \
			or backup shuttle! The game will be unresolvable. This is \
			possibly a mapping error, more likely a bug with the shuttle \
			manipulation system, or badminry. It is possible to manually \
			resolve this problem by loading an emergency shuttle template \
			manually, and then calling register() on the mobile docking port. \
			Good luck.")
			return
		emergency = backup_shuttle

	if(world.time - round_start_time < config.shuttle_refuel_delay)
		user << "The emergency shuttle is refueling. Please wait another [abs(round(((world.time - round_start_time) - config.shuttle_refuel_delay)/600))] minutes before trying again."
		return

	switch(emergency.mode)
		if(SHUTTLE_RECALL)
			user << "The emergency shuttle may not be called while returning to Centcom."
			return
		if(SHUTTLE_CALL)
			user << "The emergency shuttle is already on its way."
			return
		if(SHUTTLE_DOCKED)
			user << "The emergency shuttle is already here."
			return
		if(SHUTTLE_ESCAPE)
			user << "The emergency shuttle is moving away to a safe distance."
			return
		if(SHUTTLE_STRANDED)
			user << "The emergency shuttle has been disabled by Centcom."
			return

	call_reason = trim(html_encode(call_reason))

	if(length(call_reason) < CALL_SHUTTLE_REASON_LENGTH)
		user << "You must provide a reason."
		return

	var/area/signal_origin = get_area(user)
	var/emergency_reason = "\nNature of emergency:\n\n[call_reason]"
	if(seclevel2num(get_security_level()) == SEC_LEVEL_RED) // There is a serious threat we gotta move no time to give them five minutes.
		emergency.request(null, 0.5, signal_origin, html_decode(emergency_reason), 1)
	else
		emergency.request(null, 1, signal_origin, html_decode(emergency_reason), 0)

	log_game("[key_name(user)] has called the shuttle.")
	message_admins("[key_name_admin(user)] has called the shuttle.")

	return

// Called when an emergency shuttle mobile docking port is
// destroyed, which will only happen with admin intervention
/datum/subsystem/shuttle/proc/emergencyDeregister()
	// When a new emergency shuttle is created, it will override the
	// backup shuttle.
	src.emergency = src.backup_shuttle

/datum/subsystem/shuttle/proc/cancelEvac(mob/user)
	if(canRecall())
		emergency.cancel(get_area(user))
		log_game("[key_name(user)] has recalled the shuttle.")
		message_admins("[key_name_admin(user)] has recalled the shuttle.")
		return 1

/datum/subsystem/shuttle/proc/canRecall()
	if(emergency.mode != SHUTTLE_CALL)
		return
	if(ticker.mode.name == "meteor")
		return
	if(seclevel2num(get_security_level()) == SEC_LEVEL_RED)
		if(emergency.timeLeft(1) < emergencyCallTime * 0.25)
			return
	else
		if(emergency.timeLeft(1) < emergencyCallTime * 0.5)
			return
	return 1

/datum/subsystem/shuttle/proc/autoEvac()
	var/callShuttle = 1

	for(var/thing in shuttle_caller_list)
		if(istype(thing, /mob/living/silicon/ai))
			var/mob/living/silicon/ai/AI = thing
			if(AI.stat || !AI.client)
				continue
		else if(istype(thing, /obj/machinery/computer/communications))
			var/obj/machinery/computer/communications/C = thing
			if(C.stat & BROKEN)
				continue

		var/turf/T = get_turf(thing)
		if(T && T.z == ZLEVEL_STATION)
			callShuttle = 0
			break

	if(callShuttle)
		if(EMERGENCY_IDLE_OR_RECALLED)
			emergency.request(null, 2.5)
			log_game("There is no means of calling the shuttle anymore. Shuttle automatically called.")
			message_admins("All the communications consoles were destroyed and all AIs are inactive. Shuttle called.")

//try to move/request to dockHome if possible, otherwise dockAway. Mainly used for admin buttons
/datum/subsystem/shuttle/proc/toggleShuttle(shuttleId, dockHome, dockAway, timed)
	var/obj/docking_port/mobile/M = getShuttle(shuttleId)
	if(!M)
		return 1
	var/obj/docking_port/stationary/dockedAt = M.get_docked()
	var/destination = dockHome
	if(dockedAt && dockedAt.id == dockHome)
		destination = dockAway
	if(timed)
		if(M.request(getDock(destination)))
			return 2
	else
		if(M.dock(getDock(destination)))
			return 2
	return 0	//dock successful


/datum/subsystem/shuttle/proc/moveShuttle(shuttleId, dockId, timed)
	var/obj/docking_port/mobile/M = getShuttle(shuttleId)
	var/obj/docking_port/stationary/D = getDock(dockId)

	if(!M)
		return 1
	if(timed)
		if(M.request(D))
			return 2
	else
		if(M.dock(D))
			return 2
	return 0	//dock successful

/datum/subsystem/shuttle/proc/initial_move()
	for(var/obj/docking_port/mobile/M in mobile)
		if(!M.roundstart_move)
			continue
		moveShuttle(M.id, "[M.roundstart_move]", 0)
		CHECK_TICK

/datum/subsystem/shuttle/Recover()
	if (istype(SSshuttle.mobile))
		mobile = SSshuttle.mobile
	if (istype(SSshuttle.stationary))
		stationary = SSshuttle.stationary
	if (istype(SSshuttle.transit))
		transit = SSshuttle.transit
	if (istype(SSshuttle.discoveredPlants))
		discoveredPlants = SSshuttle.discoveredPlants
	if (istype(SSshuttle.requestlist))
		requestlist = SSshuttle.requestlist
	if (istype(SSshuttle.orderhistory))
		orderhistory = SSshuttle.orderhistory
	if (istype(SSshuttle.emergency))
		emergency = SSshuttle.emergency
	if (istype(SSshuttle.backup_shuttle))
		backup_shuttle = SSshuttle.backup_shuttle
	if (istype(SSshuttle.supply))
		supply = SSshuttle.supply

	centcom_message = SSshuttle.centcom_message
	ordernum = SSshuttle.ordernum
	points = SSshuttle.points