/atom/movable
	layer = OBJ_LAYER
	appearance_flags = TILE_BOUND|PIXEL_SCALE
	var/last_move = null
	var/anchored = 0
	// var/elevation = 2    - not used anywhere
	var/moving_diagonally
	var/move_speed = 10
	var/l_move_time = 1
	var/m_flag = 1
	var/throwing = 0
	var/thrower
	var/turf/throw_source = null
	var/throw_speed = 2
	var/throw_range = 7
	var/moved_recently = 0
	var/mob/pulledby = null
	var/item_state = null // Used to specify the item state for the on-mob overlays.
	var/icon_scale_x = 1 // Used to scale icons up or down horizonally in update_transform().
	var/icon_scale_y = 1 // Used to scale icons up or down vertically in update_transform().
	var/icon_rotation = 0 // Used to rotate icons in update_transform()
	var/old_x = 0
	var/old_y = 0
	var/does_spin = TRUE // Does the atom spin when thrown (of course it does :P)
	var/movement_type = NONE
	
	var/cloaked = FALSE //If we're cloaked or not
	var/image/cloaked_selfimage //The image we use for our client to let them see where we are

/atom/movable/Destroy()
	. = ..()
	if(reagents)
		qdel(reagents)
		reagents = null
	for(var/atom/movable/AM in contents)
		qdel(AM)
	var/turf/un_opaque
	if(opacity && isturf(loc))
		un_opaque = loc

	moveToNullspace()
	if(un_opaque)
		un_opaque.recalc_atom_opacity()
	if (pulledby)
		if (pulledby.pulling == src)
			pulledby.pulling = null
		pulledby = null

/atom/movable/vv_edit_var(var_name, var_value)
	if(var_name in GLOB.VVpixelmovement)			//Pixel movement is not yet implemented, changing this will break everything irreversibly.
		return FALSE
	return ..()

////////////////////////////////////////
// Here's where we rewrite how byond handles movement except slightly different
// To be removed on step_ conversion
// All this work to prevent a second bump
/atom/movable/Move(atom/newloc, direct=0)
	. = FALSE
	if(!newloc || newloc == loc)
		return

	if(!direct)
		direct = get_dir(src, newloc)
	set_dir(direct)

	if(!loc.Exit(src, newloc))
		return

	if(!newloc.Enter(src, src.loc))
		return

	if(!check_multi_tile_move_density_dir(direct, locs))	// We're big, and we can't move that way.
		return

	// Past this is the point of no return
	if(!locs || locs.len <= 1)	// We're not a multi-tile object.
		var/atom/oldloc = loc
		var/area/oldarea = get_area(oldloc)
		var/area/newarea = get_area(newloc)
		loc = newloc
		. = TRUE
		oldloc.Exited(src, newloc)
		if(oldarea != newarea)
			oldarea.Exited(src, newloc)

		for(var/i in oldloc)
			if(i == src) // Multi tile objects
				continue
			var/atom/movable/thing = i
			thing.Uncrossed(src)

		newloc.Entered(src, oldloc)
		if(oldarea != newarea)
			newarea.Entered(src, oldloc)

		for(var/i in loc)
			if(i == src) // Multi tile objects
				continue
			var/atom/movable/thing = i
			thing.Crossed(src)

	else if(newloc)	// We're a multi-tile object.
		. = doMove(newloc)

//
////////////////////////////////////////

/atom/movable/Move(atom/newloc, direct = 0)
	if(!loc || !newloc)
		return FALSE
	var/atom/oldloc = loc

	if(loc != newloc)
		if(!direct)
			direct = get_dir(oldloc, newloc)
		if (!(direct & (direct - 1))) //Cardinal move
			. = ..()
		else //Diagonal move, split it into cardinal moves
			moving_diagonally = FIRST_DIAG_STEP
			var/first_step_dir
			// The `&& moving_diagonally` checks are so that a forceMove taking
			// place due to a Crossed, Bumped, etc. call will interrupt
			// the second half of the diagonal movement, or the second attempt
			// at a first half if step() fails because we hit something.
			if (direct & NORTH)
				if (direct & EAST)
					if (step(src, NORTH) && moving_diagonally)
						first_step_dir = NORTH
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, EAST)
					else if (moving_diagonally && step(src, EAST))
						first_step_dir = EAST
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, NORTH)
				else if (direct & WEST)
					if (step(src, NORTH) && moving_diagonally)
						first_step_dir = NORTH
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, WEST)
					else if (moving_diagonally && step(src, WEST))
						first_step_dir = WEST
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, NORTH)
			else if (direct & SOUTH)
				if (direct & EAST)
					if (step(src, SOUTH) && moving_diagonally)
						first_step_dir = SOUTH
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, EAST)
					else if (moving_diagonally && step(src, EAST))
						first_step_dir = EAST
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, SOUTH)
				else if (direct & WEST)
					if (step(src, SOUTH) && moving_diagonally)
						first_step_dir = SOUTH
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, WEST)
					else if (moving_diagonally && step(src, WEST))
						first_step_dir = WEST
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, SOUTH)
			if(moving_diagonally == SECOND_DIAG_STEP)
				if(!.)
					set_dir(first_step_dir)
				//else if (!inertia_moving)
				//	inertia_next_move = world.time + inertia_move_delay
				//	newtonian_move(direct)
			moving_diagonally = 0
			return

	if(!loc || (loc == oldloc && oldloc != newloc))
		last_move = 0
		return

	if(.)
		Moved(oldloc, direct)

	//Polaris stuff
	move_speed = world.time - l_move_time
	l_move_time = world.time
	m_flag = 1
	//End

	last_move = direct
	set_dir(direct)
	if(. && has_buckled_mobs() && !handle_buckled_mob_movement(loc,direct)) //movement failed due to buckled mob(s)
		return FALSE

//Called after a successful Move(). By this point, we've already moved
/atom/movable/proc/Moved(atom/OldLoc, Dir, Forced = FALSE)
	//if (!inertia_moving)
	//	inertia_next_move = world.time + inertia_move_delay
	//	newtonian_move(Dir)
	//if (length(client_mobs_in_contents))
	//	update_parallax_contents()

	return TRUE

// Make sure you know what you're doing if you call this, this is intended to only be called by byond directly.
// You probably want CanPass()
/atom/movable/Cross(atom/movable/AM)
	. = TRUE
	return CanPass(AM, loc)

/atom/movable/CanPass(atom/movable/mover, turf/target)
	. = ..()
	if(locs && locs.len >= 2)	// If something is standing on top of us, let them pass.
		if(mover.loc in locs)
			. = TRUE
	return .

//oldloc = old location on atom, inserted when forceMove is called and ONLY when forceMove is called!
/atom/movable/Crossed(atom/movable/AM, oldloc)
	return

/atom/movable/Uncross(atom/movable/AM, atom/newloc)
	. = ..()
	if(isturf(newloc) && !CheckExit(AM, newloc))
		return FALSE

/atom/movable/Bump(atom/A)
	if(!A)
		CRASH("Bump was called with no argument.")
	. = ..()
	if(throwing)
		throw_impact(A)
		throwing = 0
		if(QDELETED(A))
			return
	A.Bumped(src)
	A.last_bumped = world.time

/atom/movable/proc/forceMove(atom/destination)
	. = FALSE
	if(destination)
		. = doMove(destination)
	else
		CRASH("No valid destination passed into forceMove")

/atom/movable/proc/moveToNullspace()
	return doMove(null)

/atom/movable/proc/doMove(atom/destination)
	. = FALSE
	if(destination)
		var/atom/oldloc = loc
		var/same_loc = oldloc == destination
		var/area/old_area = get_area(oldloc)
		var/area/destarea = get_area(destination)

		loc = destination
		moving_diagonally = 0

		if(!same_loc)
			if(oldloc)
				oldloc.Exited(src, destination)
				if(old_area && old_area != destarea)
					old_area.Exited(src, destination)
			for(var/atom/movable/AM in oldloc)
				AM.Uncrossed(src)
			var/turf/oldturf = get_turf(oldloc)
			var/turf/destturf = get_turf(destination)
			var/old_z = (oldturf ? oldturf.z : null)
			var/dest_z = (destturf ? destturf.z : null)
			if (old_z != dest_z)
				onTransitZ(old_z, dest_z)
			destination.Entered(src, oldloc)
			if(destarea && old_area != destarea)
				destarea.Entered(src, oldloc)

			for(var/atom/movable/AM in destination)
				if(AM == src)
					continue
				AM.Crossed(src, oldloc)

		// Break pulling if we are too far to pull now.
		if(pulledby && (pulledby.z != src.z || get_dist(pulledby, src) > 1))
			pulledby.stop_pulling()

		Moved(oldloc, NONE, TRUE)
		. = TRUE

	//If no destination, move the atom into nullspace (don't do this unless you know what you're doing)
	else
		. = TRUE
		if (loc)
			var/atom/oldloc = loc
			var/area/old_area = get_area(oldloc)
			oldloc.Exited(src, null)
			if(old_area)
				old_area.Exited(src, null)
		loc = null

/atom/movable/proc/onTransitZ(old_z,new_z)
	GLOB.z_moved_event.raise_event(src, old_z, new_z)
	for(var/item in src) // Notify contents of Z-transition. This can be overridden IF we know the items contents do not care.
		var/atom/movable/AM = item
		AM.onTransitZ(old_z,new_z)
/////////////////////////////////////////////////////////////////

//called when src is thrown into hit_atom
/atom/movable/proc/throw_impact(atom/hit_atom, var/speed)
	if(istype(hit_atom,/mob/living))
		var/mob/living/M = hit_atom
		if(M.buckled == src)
			return // Don't hit the thing we're buckled to.
		M.hitby(src,speed)

	else if(isobj(hit_atom))
		var/obj/O = hit_atom
		if(!O.anchored)
			step(O, src.last_move)
		O.hitby(src,speed)

	else if(isturf(hit_atom))
		src.throwing = 0
		var/turf/T = hit_atom
		T.hitby(src,speed)

//decided whether a movable atom being thrown can pass through the turf it is in.
/atom/movable/proc/hit_check(var/speed)
	if(src.throwing)
		for(var/atom/A in get_turf(src))
			if(A == src) continue
			if(istype(A,/mob/living))
				if(A:lying) continue
				src.throw_impact(A,speed)
			if(isobj(A))
				if(!A.density || A.throwpass)
					continue
				// Special handling of windows, which are dense but block only from some directions
				if(istype(A, /obj/structure/window))
					var/obj/structure/window/W = A
					if (!W.is_fulltile() && !(turn(src.last_move, 180) & A.dir))
						continue
				// Same thing for (closed) windoors, which have the same problem
				else if(istype(A, /obj/machinery/door/window) && !(turn(src.last_move, 180) & A.dir))
					continue
				src.throw_impact(A,speed)

/atom/movable/proc/throw_at(atom/target, range, speed, thrower)
	if(!target || !src)
		return 0
	if(target.z != src.z)
		return 0
	//use a modified version of Bresenham's algorithm to get from the atom's current position to that of the target
	src.throwing = 1
	src.thrower = thrower
	src.throw_source = get_turf(src)	//store the origin turf
	src.pixel_z = 0
	if(usr)
		if(HULK in usr.mutations)
			src.throwing = 2 // really strong throw!

	var/dist_travelled = 0
	var/dist_since_sleep = 0
	var/area/a = get_area(src.loc)

	var/dist_x = abs(target.x - src.x)
	var/dist_y = abs(target.y - src.y)

	var/dx
	if (target.x > src.x)
		dx = EAST
	else
		dx = WEST

	var/dy
	if (target.y > src.y)
		dy = NORTH
	else
		dy = SOUTH

	var/error
	var/major_dir
	var/major_dist
	var/minor_dir
	var/minor_dist
	if(dist_x > dist_y)
		error = dist_x/2 - dist_y
		major_dir = dx
		major_dist = dist_x
		minor_dir = dy
		minor_dist = dist_y
	else
		error = dist_y/2 - dist_x
		major_dir = dy
		major_dist = dist_y
		minor_dir = dx
		minor_dist = dist_x

	while(src && target && src.throwing && istype(src.loc, /turf) \
		  && ((abs(target.x - src.x)+abs(target.y - src.y) > 0 && dist_travelled < range) \
		  	   || (a && a.has_gravity == 0) \
			   || istype(src.loc, /turf/space)))
		// only stop when we've gone the whole distance (or max throw range) and are on a non-space tile, or hit something, or hit the end of the map, or someone picks it up
		var/atom/step
		if(error >= 0)
			step = get_step(src, major_dir)
			error -= minor_dist
		else
			step = get_step(src, minor_dir)
			error += major_dist
		if(!step) // going off the edge of the map makes get_step return null, don't let things go off the edge
			break
		src.Move(step)
		hit_check(speed)
		dist_travelled++
		dist_since_sleep++
		if(dist_since_sleep >= speed)
			dist_since_sleep = 0
			sleep(1)
		a = get_area(src.loc)
		// and yet it moves
		if(src.does_spin)
			src.SpinAnimation(speed = 4, loops = 1)

	//done throwing, either because it hit something or it finished moving
	if(isobj(src)) src.throw_impact(get_turf(src),speed)
	src.throwing = 0
	src.thrower = null
	src.throw_source = null
	fall()


//Overlays
/atom/movable/overlay
	var/atom/master = null
	anchored = 1

/atom/movable/overlay/New()
	for(var/x in src.verbs)
		src.verbs -= x
	..()

/atom/movable/overlay/attackby(a, b)
	if (src.master)
		return src.master.attackby(a, b)
	return

/atom/movable/overlay/attack_hand(a, b, c)
	if (src.master)
		return src.master.attack_hand(a, b, c)
	return

/atom/movable/proc/touch_map_edge()
	if(z in using_map.sealed_levels)
		return

	if(using_map.use_overmap)
		overmap_spacetravel(get_turf(src), src)
		return

	var/move_to_z = src.get_transit_zlevel()
	if(move_to_z)
		var/new_z = move_to_z
		var/new_x
		var/new_y

		if(x <= TRANSITIONEDGE)
			new_x = world.maxx - TRANSITIONEDGE - 2
			new_y = rand(TRANSITIONEDGE + 2, world.maxy - TRANSITIONEDGE - 2)

		else if (x >= (world.maxx - TRANSITIONEDGE + 1))
			new_x = TRANSITIONEDGE + 1
			new_y = rand(TRANSITIONEDGE + 2, world.maxy - TRANSITIONEDGE - 2)

		else if (y <= TRANSITIONEDGE)
			new_y = world.maxy - TRANSITIONEDGE -2
			new_x = rand(TRANSITIONEDGE + 2, world.maxx - TRANSITIONEDGE - 2)

		else if (y >= (world.maxy - TRANSITIONEDGE + 1))
			new_y = TRANSITIONEDGE + 1
			new_x = rand(TRANSITIONEDGE + 2, world.maxx - TRANSITIONEDGE - 2)

		if(ticker && istype(ticker.mode, /datum/game_mode/nuclear)) //only really care if the game mode is nuclear
			var/datum/game_mode/nuclear/G = ticker.mode
			G.check_nuke_disks()

		var/turf/T = locate(new_x, new_y, new_z)
		if(istype(T))
			forceMove(T)

//by default, transition randomly to another zlevel
/atom/movable/proc/get_transit_zlevel()
	var/list/candidates = using_map.accessible_z_levels.Copy()
	candidates.Remove("[src.z]")

	if(!candidates.len)
		return null
	return text2num(pickweight(candidates))

/atom/movable/proc/update_transform()
	var/matrix/M = matrix()
	M.Scale(icon_scale_x, icon_scale_y)
	M.Turn(icon_rotation)
	src.transform = M

// Use this to set the object's scale.
/atom/movable/proc/adjust_scale(new_scale_x, new_scale_y)
	if(isnull(new_scale_y))
		new_scale_y = new_scale_x
	if(new_scale_x != 0)
		icon_scale_x = new_scale_x
	if(new_scale_y != 0)
		icon_scale_y = new_scale_y
	update_transform()

/atom/movable/proc/adjust_rotation(new_rotation)
	icon_rotation = new_rotation
	update_transform()

// Called when touching a lava tile.
/atom/movable/proc/lava_act()
	fire_act(null, 10000, 1000)


// Procs to cloak/uncloak
/atom/movable/proc/cloak()
	if(cloaked)
		return FALSE
	cloaked = TRUE
	. = TRUE // We did work

	var/static/animation_time = 1 SECOND
	cloaked_selfimage = get_cloaked_selfimage()

	//Wheeee
	cloak_animation(animation_time)

	//Needs to be last so people can actually see the effect before we become invisible
	plane = CLOAKED_PLANE

/atom/movable/proc/uncloak()
	if(!cloaked)
		return FALSE
	cloaked = FALSE
	. = TRUE // We did work

	var/static/animation_time = 1 SECOND
	QDEL_NULL(cloaked_selfimage)

	//Needs to be first so people can actually see the effect, so become uninvisible first
	plane = initial(plane)

	//Oooooo
	uncloak_animation(animation_time)


// Animations for cloaking/uncloaking
/atom/movable/proc/cloak_animation(var/length = 1 SECOND)
	//Save these
	var/initial_alpha = alpha
	
	//Animate alpha fade
	animate(src, alpha = 0, time = length)

	//Animate a cloaking effect
	var/our_filter = filters.len+1 //Filters don't appear to have a type that can be stored in a var and accessed. This is how the DM reference does it.
	filters += filter(type="wave", x = 0, y = 16, size = 0, offset = 0, flags = WAVE_SIDEWAYS)
	animate(filters[our_filter], offset = 1, size = 8, time = length, flags = ANIMATION_PARALLEL)

	//Wait for animations to finish
	sleep(length+5)

	//Remove those
	filters -= filters[our_filter]

	//Back to original alpha
	alpha = initial_alpha

/atom/movable/proc/uncloak_animation(var/length = 1 SECOND)
	//Save these
	var/initial_alpha = alpha

	//Put us back to normal, but no alpha
	alpha = 0

	//Animate alpha fade up
	animate(src, alpha = initial_alpha, time = length)

	//Animate a cloaking effect
	var/our_filter = filters.len+1 //Filters don't appear to have a type that can be stored in a var and accessed. This is how the DM reference does it.
	filters += filter(type="wave", x=0, y = 16, size = 8, offset = 1, flags = WAVE_SIDEWAYS)
	animate(filters[our_filter], offset = 0, size = 0, time = length, flags = ANIMATION_PARALLEL)

	//Wait for animations to finish
	sleep(length+5)

	//Remove those
	filters -= filters[our_filter]


// So cloaked things can see themselves, if necessary
/atom/movable/proc/get_cloaked_selfimage()
	var/icon/selficon = icon(icon, icon_state)
	selficon.MapColors(0,0,0, 0,0,0, 0,0,0, 1,1,1) //White
	var/image/selfimage = image(selficon)
	selfimage.color = "#0000FF"
	selfimage.alpha = 100
	selfimage.layer = initial(layer)
	selfimage.plane = initial(plane)
	selfimage.loc = src

	return selfimage