/turf
	icon = 'icons/turf/floors.dmi'
	layer = TURF_LAYER
	plane = TURF_PLANE
	vis_flags = VIS_INHERIT_ID | VIS_INHERIT_PLANE// Important for interaction with and visualization of openspace.
	level = 1
	var/holy = 0

	// Initial air contents (in moles)
	var/oxygen = 0
	var/carbon_dioxide = 0
	var/nitrogen = 0
	var/phoron = 0
	var/nitrous_oxide = 0
	var/methane = 0

	//Properties for airtight tiles (/wall)
	var/thermal_conductivity = 0.05
	var/heat_capacity = 1

	//Properties for both
	var/temperature = T20C      // Initial turf temperature.
	var/blocks_air = 0          // Does this turf contain air/let air through?

	// General properties.
	var/icon_old = null
	var/pathweight = 1          // How much does it cost to pathfind over this turf?
	var/blessed = 0             // Has the turf been blessed?
	var/dig_exhaustion_chance = 60 // Chance that the digging loot will be exhausted, if set to TURF_DIG_LOOT_EXHAUSTED then the turf is exhausted of loot. if set to TURF_DIG_LOOT_ENDLESS it will never run out.

	var/list/decals

	var/movement_cost = 0       // How much the turf slows down movement, if any.

	var/block_tele = FALSE      // If true, most forms of teleporting to or from this turf tile will fail.
	var/can_build_into_floor = FALSE // Used for things like RCDs (and maybe lattices/floor tiles in the future), to see if a floor should replace it.
	var/list/dangerous_objects // List of 'dangerous' objs that the turf holds that can cause something bad to happen when stepped on, used for AI mobs.
	var/tmp/changing_turf

	var/blocks_nonghost_incorporeal = FALSE
	var/footstep
	var/barefootstep
	var/heavyfootstep
	var/clawfootstep

/turf/simulated/floor
	footstep = FOOTSTEP_FLOOR
	barefootstep = FOOTSTEP_HARD_BAREFOOT
	heavyfootstep = FOOTSTEP_GENERIC_HEAVY
	clawfootstep = FOOTSTEP_HARD_CLAW

/turf/simulated/floor/wood
	footstep = FOOTSTEP_WOOD
	barefootstep = FOOTSTEP_WOOD_BAREFOOT
	clawfootstep = FOOTSTEP_WOOD_CLAW

/turf/simulated/floor/carpet
	footstep = FOOTSTEP_CARPET
	barefootstep = FOOTSTEP_CARPET_BAREFOOT
	clawfootstep = FOOTSTEP_CARPET_BAREFOOT

/turf/simulated/floor/plating
	footstep = FOOTSTEP_PLATING
	barefootstep = FOOTSTEP_HARD_BAREFOOT
	clawfootstep = FOOTSTEP_HARD_CLAW

/turf/simulated/mineral
	footstep = FOOTSTEP_SAND
	barefootstep = FOOTSTEP_SAND
	clawfootstep = FOOTSTEP_SAND

/turf/simulated/floor/outdoors
	footstep = FOOTSTEP_SAND
	barefootstep = FOOTSTEP_SAND
	clawfootstep = FOOTSTEP_SAND

/turf/simulated/floor/outdoors/grass
	footstep = FOOTSTEP_GRASS
	barefootstep = FOOTSTEP_GRASS
	clawfootstep = FOOTSTEP_GRASS

/turf/simulated/floor/water
	footstep = FOOTSTEP_WATER
	barefootstep = FOOTSTEP_WATER
	clawfootstep = FOOTSTEP_WATER

/turf/simulated/floor/lava
	footstep = FOOTSTEP_LAVA
	barefootstep = FOOTSTEP_LAVA
	clawfootstep = FOOTSTEP_LAVA

/turf/Initialize(mapload)
	. = ..()
	for(var/atom/movable/AM in src)
		Entered(AM)

	//Lighting related
	set_luminosity(!(dynamic_lighting))

	if(opacity)
		directional_opacity = ALL_CARDINALS

	//Pathfinding related
	if(movement_cost && pathweight == 1) // This updates pathweight automatically.
		pathweight = movement_cost

	var/turf/Ab = GetAbove(src)
	if(Ab)
		Ab.multiz_turf_new(src, DOWN)
	var/turf/Be = GetBelow(src)
	if(Be)
		Be.multiz_turf_new(src, UP)

/turf/Destroy()
	if (!changing_turf)
		stack_trace("Improper turf qdel. Do not qdel turfs directly.")
	changing_turf = FALSE
	GLOB.cleanbot_reserved_turfs -= src
	if(connections)
		connections.erase_all()
	..()
	return QDEL_HINT_IWILLGC

/turf/ex_act(severity)
	return 0

/turf/proc/is_space()
	return 0

/turf/proc/is_intact()
	return 0

// Used by shuttle code to check if this turf is empty enough to not crush want it lands on.
/turf/proc/is_solid_structure()
	return 1

/turf/attack_hand(mob/user)
	//QOL feature, clicking on turf can toggle doors, unless pulling something
	if(!user.pulling)
		var/obj/machinery/door/airlock/AL = locate(/obj/machinery/door/airlock) in src.contents
		if(AL)
			AL.attack_hand(user)
			return TRUE
		var/obj/machinery/door/firedoor/FD = locate(/obj/machinery/door/firedoor) in src.contents
		if(FD)
			FD.attack_hand(user)
			return TRUE

	if(!(user.canmove) || user.restrained() || !(user.pulling))
		return 0
	if(user.pulling.anchored || !isturf(user.pulling.loc))
		return 0
	if(user.pulling.loc != user.loc && get_dist(user, user.pulling) > 1)
		return 0
	if(ismob(user.pulling))
		var/mob/M = user.pulling
		var/atom/movable/t = M.pulling
		M.stop_pulling()
		step(user.pulling, get_dir(user.pulling.loc, src))
		M.start_pulling(t)
	else
		step(user.pulling, get_dir(user.pulling.loc, src))
	return 1

/turf/attackby(obj/item/W, mob/user)
	// Check if this turf can be dug up, check initial because we remove the flag when we've exhausted all loot, but still want to keep dig functionality
	if((flags & TURF_CAN_DIG_SHOVEL) && !density && istype(W, /obj/item/shovel))
		handle_turf_dig(user, W)
		return TRUE
	// Collect objects on turf if the bag supports scooping stuff up
	if(istype(W, /obj/item/storage))
		var/obj/item/storage/S = W
		if(S.use_to_pickup && S.collection_mode)
			S.gather_all(src, user)
	return ..()

// Hits a mob on the tile.
/turf/proc/attack_tile(obj/item/W, mob/living/user)
	if(!istype(W))
		return FALSE

	var/list/viable_targets = list()
	var/success = FALSE // Hitting something makes this true. If its still false, the miss sound is played.

	for(var/mob/living/L in contents)
		if(L == user) // Don't hit ourselves.
			continue
		viable_targets += L

	if(!viable_targets.len) // No valid targets on this tile.
		if(W.can_cleave)
			success = W.cleave(user, src)
	else
		var/mob/living/victim = pick(viable_targets)
		success = W.resolve_attackby(victim, user)

	user.setClickCooldown(user.get_attack_speed(W))
	user.do_attack_animation(src, no_attack_icons = TRUE)

	if(!success) // Nothing got hit.
		user.visible_message(span_warning("\The [user] swipes \the [W] over \the [src]."))
		playsound(src, 'sound/weapons/punchmiss.ogg', 25, 1, -1)
	return success

/turf/MouseDrop_T(atom/movable/O as mob|obj, mob/user as mob)
	var/turf/T = get_turf(user)
	var/area/A = T.loc
	if((istype(A) && !(A.get_gravity())) || (istype(T,/turf/space)))
		return
	if(istype(O, /atom/movable/screen))
		return
	if(user.restrained() || user.stat || user.stunned || user.paralysis || (!user.lying && !isrobot(user)) || LAZYLEN(user.grabbed_by) || user.is_paralyzed())
		return
	if((!(istype(O, /atom/movable)) || O.anchored || !Adjacent(user) || !Adjacent(O) || !user.Adjacent(O)))
		return
	if(!isturf(O.loc) || !isturf(user.loc))
		return
	if(isanimal(user) && O != user)
		return
	if (do_after(user, 25 + (5 * user.weakened), target = O) && !(user.stat))
		step_towards(O, src)
		if(ismob(O))
			animate(O, transform = turn(O.transform, 20), time = 2)
			sleep(2)
			animate(O, transform = turn(O.transform, -40), time = 4)
			sleep(4)
			animate(O, transform = turn(O.transform, 20), time = 2)
			sleep(2)
			O.update_transform()

/turf/CanPass(atom/movable/mover, turf/target)
	if(!target)
		return FALSE

	if(istype(mover)) // turf/Enter(...) will perform more advanced checks
		return !density

	stack_trace("Non movable passed to turf CanPass : [mover]")
	return FALSE

//There's a lot of QDELETED() calls here if someone can figure out how to optimize this but not runtime when something gets deleted by a Bump/CanPass/Cross call, lemme know or go ahead and fix this mess - kevinz000
/turf/Enter(atom/movable/mover, atom/oldloc)
	// Do not call ..()
	// Byond's default turf/Enter() doesn't have the behaviour we want with Bump()
	// By default byond will call Bump() on the first dense object in contents
	// Here's hoping it doesn't stay like this for years before we finish conversion to step_
	var/atom/firstbump
	var/CanPassSelf = CanPass(mover, src)
	if(CanPassSelf || CHECK_BITFIELD(mover.movement_type, UNSTOPPABLE))
		for(var/i in contents)
			if(QDELETED(mover))
				return FALSE		//We were deleted, do not attempt to proceed with movement.
			if(i == mover || i == mover.loc) // Multi tile objects and moving out of other objects
				continue
			var/atom/movable/thing = i
			if(!thing.Cross(mover))
				if(QDELETED(mover))		//Mover deleted from Cross/CanPass, do not proceed.
					return FALSE
				if(CHECK_BITFIELD(mover.movement_type, UNSTOPPABLE))
					mover.Bump(thing)
					continue
				else
					if(!firstbump || ((thing.layer > firstbump.layer || thing.flags & ON_BORDER) && !(firstbump.flags & ON_BORDER)))
						firstbump = thing
	if(QDELETED(mover))					//Mover deleted from Cross/CanPass/Bump, do not proceed.
		return FALSE
	if(!CanPassSelf)	//Even if mover is unstoppable they need to bump us.
		firstbump = src
	if(firstbump)
		mover.Bump(firstbump)
		return !QDELETED(mover) && CHECK_BITFIELD(mover.movement_type, UNSTOPPABLE)
	return TRUE

/turf/Exit(atom/movable/mover, atom/newloc)
	. = ..()
	if(!. || QDELETED(mover))
		return FALSE
	for(var/i in contents)
		if(i == mover)
			continue
		var/atom/movable/thing = i
		if(!thing.Uncross(mover, newloc))
			if(thing.flags & ON_BORDER)
				mover.Bump(thing)
			if(!CHECK_BITFIELD(mover.movement_type, UNSTOPPABLE))
				return FALSE
		if(QDELETED(mover))
			return FALSE		//We were deleted.

/turf/proc/adjacent_fire_act(turf/simulated/floor/source, temperature, volume)
	return

/turf/proc/is_plating()
	return 0

/turf/proc/levelupdate()
	for(var/obj/O in src)
		O.hide(O.hides_under_flooring() && !is_plating())

/turf/proc/AdjacentTurfs(var/check_blockage = TRUE)
	. = list()
	for(var/turf/T as anything in (trange(1,src) - src))
		if(check_blockage)
			if(!T.density)
				if(!LinkBlocked(src, T) && !TurfBlockedNonWindow(T))
					. += T
		else
			. += T

/turf/proc/CardinalTurfs(var/check_blockage = TRUE)
	. = list()
	for(var/turf/T as anything in AdjacentTurfs(check_blockage))
		if(T.x == src.x || T.y == src.y)
			. += T

/turf/proc/Distance(turf/t)
	if(get_dist(src,t) == 1)
		var/cost = (src.x - t.x) * (src.x - t.x) + (src.y - t.y) * (src.y - t.y)
		cost *= (pathweight+t.pathweight)/2
		return cost
	else
		return get_dist(src,t)

/turf/proc/AdjacentTurfsSpace()
	var/L[] = new()
	for(var/turf/t in oview(src,1))
		if(!t.density)
			if(!LinkBlocked(src, t) && !TurfBlockedNonWindow(t))
				L.Add(t)
	return L

/turf/proc/contains_dense_objects()
	if(density)
		return 1
	for(var/atom/A in src)
		if(A.density && !(A.flags & ON_BORDER))
			return 1
	return 0

/turf/proc/update_blood_overlays()
	return

// Called when turf is hit by a thrown object
/turf/hitby(atom/movable/source, datum/thrownthing/throwingdatum)
	if(!density)
		return

	if(!get_gravity(source)) //Checked a different codebase for reference. Turns out it's only supposed to happen in no-gravity
		spawn(2)
			step(source, turn(source.last_move, 180)) //This makes it float away after hitting a wall in 0G
	if(isliving(source))
		var/mob/living/M = source
		M.turf_collision(src, throwingdatum?.speed)

/turf/AllowDrop()
	return TRUE

/turf/proc/can_engrave()
	return FALSE

/turf/proc/try_graffiti(var/mob/vandal, var/obj/item/tool, click_parameters)

	if(!tool || !tool.sharp || !can_engrave())
		return FALSE

	if(jobban_isbanned(vandal, JOB_GRAFFITI))
		to_chat(vandal, span_warning("You are banned from leaving persistent information across rounds."))
		return

	var/too_much_graffiti = 0
	for(var/obj/effect/decal/writing/W in src)
		too_much_graffiti++
	if(too_much_graffiti >= 5)
		to_chat(vandal, span_warning("There's too much graffiti here to add more."))
		return FALSE

	var/message = tgui_input_text(vandal, "Enter a message to engrave.", "Graffiti", "", MAX_MESSAGE_LEN)
	if(!message)
		return FALSE

	if(!vandal || vandal.incapacitated() || !Adjacent(vandal) || !tool.loc == vandal)
		return FALSE

	vandal.visible_message(span_warning("\The [vandal] begins carving something into \the [src]."))

	if(!do_after(vandal, max(2 SECONDS, length(message)), target = src))
		return FALSE

	vandal.visible_message(span_danger("\The [vandal] carves some graffiti into \the [src]."))
	var/obj/effect/decal/writing/graffiti = new(src)
	graffiti.message = message
	graffiti.author = vandal.ckey

	if(click_parameters)
		var/list/mouse_control = params2list(click_parameters)
		var/p_x = 0
		var/p_y = 0
		if(mouse_control["icon-x"])
			p_x = text2num(mouse_control["icon-x"]) - 16
		if(mouse_control["icon-y"])
			p_y = text2num(mouse_control["icon-y"]) - 16

		graffiti.pixel_x = p_x
		graffiti.pixel_y = p_y

	if(lowertext(message) == "elbereth")
		to_chat(vandal, span_notice("You feel much safer."))

	return TRUE

// Returns false if stepping into a tile would cause harm (e.g. open space while unable to fly, water tile while a slime, lava, etc).
/turf/proc/is_safe_to_enter(mob/living/L)
	if(LAZYLEN(dangerous_objects))
		for(var/obj/O in dangerous_objects)
			if(!O.is_safe_to_step(L))
				return FALSE
	return TRUE

// Tells the turf that it currently contains something that automated movement should consider if planning to enter the tile.
// This uses lazy list macros to reduce memory footprint, since for 99% of turfs the list would've been empty anyways.
/turf/proc/register_dangerous_object(obj/O)
	if(!istype(O))
		return FALSE
	LAZYADD(dangerous_objects, O)
//	color = "#FF0000"

// Similar to above, for when the dangerous object stops being dangerous/gets deleted/moved/etc.
/turf/proc/unregister_dangerous_object(obj/O)
	if(!istype(O))
		return FALSE
	LAZYREMOVE(dangerous_objects, O)
	UNSETEMPTY(dangerous_objects) // This nulls the list var if it's empty.
//	color = "#00FF00"

// This is all the way up here since its the common ancestor for things that need to get replaced with a floor when an RCD is used on them.
// More specialized turfs like walls should instead override this.
// The code for applying lattices/floor tiles onto lattices could also utilize something similar in the future.
/turf/rcd_values(mob/living/user, obj/item/rcd/the_rcd, passed_mode)
	if(density || !can_build_into_floor)
		return FALSE
	if(passed_mode == RCD_FLOORWALL)
		var/obj/structure/lattice/L = locate() in src
		// A lattice costs one rod to make. A sheet can make two rods, meaning a lattice costs half of a sheet.
		// A sheet also makes four floor tiles, meaning it costs 1/4th of a sheet to place a floor tile on a lattice.
		// Therefore it should cost 3/4ths of a sheet if a lattice is not present, or 1/4th of a sheet if it does.
		return list(
			RCD_VALUE_MODE = RCD_FLOORWALL,
			RCD_VALUE_DELAY = 0,
			RCD_VALUE_COST = L ? RCD_SHEETS_PER_MATTER_UNIT * 0.25 : RCD_SHEETS_PER_MATTER_UNIT * 0.75
			)
	return FALSE

/turf/rcd_act(mob/living/user, obj/item/rcd/the_rcd, passed_mode)
	if(passed_mode == RCD_FLOORWALL)
		to_chat(user, span_notice("You build a floor."))
		ChangeTurf(/turf/simulated/floor/airless, preserve_outdoors = TRUE)
		return TRUE
	return FALSE

/turf/occult_act(mob/living/user)
	to_chat(user, span_cult("You consecrate the floor."))
	ChangeTurf(/turf/simulated/floor/cult, preserve_outdoors = TRUE)
	return TRUE

// We're about to be the A-side in a turf translation
/turf/proc/pre_translate_A(var/turf/B)
	return
// We're about to be the B-side in a turf translation
/turf/proc/pre_translate_B(var/turf/A)
	return
// We were the the A-side in a turf translation
/turf/proc/post_translate_A(var/turf/B)
	return
// We were the the B-side in a turf translation
/turf/proc/post_translate_B(var/turf/A)
	return

/turf/proc/add_vomit_floor(mob/living/M, toxvomit = NONE, purge = TRUE)

	var/obj/effect/decal/cleanable/vomit/V = new /obj/effect/decal/cleanable/vomit(src, M.GetSpreadableViruses())

	if (QDELETED(V))
		V = locate() in src
	if(!V)
		return
	if(toxvomit == VOMIT_PURPLE)
		V.icon_state = "vomitpurp_1"
		V.random_icon_states = list("vomitpurp_1", "vomitpurp_2", "vomitpurp_3", "vomitpurp_4")
	else if (toxvomit == VOMIT_TOXIC)
		V.icon_state = "vomittox_1"
		V.random_icon_states = list("vomittox_1", "vomittox_2", "vomittox_3", "vomittox_4")
	else if (toxvomit == VOMIT_NANITE)
		V.name = "metallic slurry"
		V.desc = "A puddle of metallic slury that looks vaguely like very fine sand. It almost seems like it's moving..."
		V.icon_state = "vomitnanite_1"
		V.random_icon_states = list("vomitnanite_1", "vomitnanite_2", "vomitnanite_3", "vomitnanite_4")
	if(purge && ishuman(M))
		var/mob/living/carbon/human/H = M
		if(H.ingested)
			clear_reagents_to_vomit_pool(H, V)

/proc/clear_reagents_to_vomit_pool(mob/living/carbon/human/H, obj/effect/decal/cleanable/vomit/V)
	H.ingested.trans_to(V, H.ingested.total_volume / 10)
	for(var/datum/reagent/R in H.ingested.reagent_list)
		H.ingested.remove_reagent(R, min(R.volume, 10))

/**
* 	Called when this turf is being washed. Washing a turf will also wash any mopable floor decals
*/
/turf/wash(clean_types)
	. = ..()

	if(istype(src, /turf/simulated))
		var/turf/simulated/T = src
		if(T.dirt > 0)
			SEND_GLOBAL_SIGNAL(COMSIG_GLOB_WASHED_FLOOR)
		T.dirt = 0

	for(var/am in src)
		if(am == src)
			continue
		var/atom/movable/movable_content = am
		if(!ismopable(movable_content))
			continue
		movable_content.wash(clean_types)

/// Used during turf_cascade subsystem to determine additional effects when spreading, and directions it may spread
/turf/proc/conversion_cascade_act(list/already_marked_turfs)
	var/list/expanding_turfs = list()

	for(var/expand_dir in GLOB.cardinalz)
		var/turf/next_turf = get_step(src, expand_dir)
		if(next_turf && next_turf.type != type && !(next_turf in already_marked_turfs)) // Yes in already_marked_turfs is expensive, but less expensive than 6 dupes per turf potentially in the loop
			expanding_turfs += next_turf

	return expanding_turfs