/obj
	animate_movement = 2

	
	var/list/matter //Used to store information about the contents of the object.
	var/w_class // Size of the object.
	var/list/origin_tech = null	//Used by R&D to determine what research bonuses it grants.
	var/unacidable = 0 //universal "unacidabliness" var, here so you can use it in any obj.
	
	var/obj_flags //Special flags such as whether or not this object can be rotated.
	var/throwforce = 1
	var/list/attack_verb //Used in attackby() to say how something was attacked "[x] has been [z.attack_verb] by [y] with [z]"
	var/sharp = 0		// whether this object cuts
	var/edge = 0		// whether this object is more likely to dismember
	var/in_use = 0 // If we have a user using us, this will be set on. We will check if the user has stopped using us, and thus stop updating and LAGGING EVERYTHING!
	var/damtype = BRUTE
	var/force = 0
	var/armor_penetration = 0
	var/noslice = 0 // To make it not able to slice things.

	var/being_shocked = 0

	var/icon_species_tag = ""//If set, this holds the 3-letter shortname of a species, used for species-specific worn icons
	var/icon_auto_adapt = 0//If 1, this item will automatically change its species tag to match the wearer's species.
	//requires that the wearer's species is listed in icon_supported_species_tags
	var/list/icon_supported_species_tags //Used with icon_auto_adapt, a list of species which have differing appearances for this item
	var/icon_species_in_hand = 0//If 1, we will use the species tag even for rendering this item in the left/right hand.

	var/equip_slot = 0
	var/usesound
	var/toolspeed = 1

/obj/Destroy()
	STOP_PROCESSING(SSprocessing, src)
	return ..()

/obj/Topic(href, href_list, var/datum/topic_state/state = default_state)
	if(..())
		return 1

	// In the far future no checks are made in an overriding Topic() beyond if(..()) return
	// Instead any such checks are made in CanUseTopic()
	if(CanUseTopic(usr, state, href_list) == STATUS_INTERACTIVE)
		CouldUseTopic(usr)
		return 0

	CouldNotUseTopic(usr)
	return 1

/obj/CanUseTopic(var/mob/user, var/datum/topic_state/state)
	if(user.CanUseObjTopic(src))
		return ..()
	to_chat(user, "<span class='danger'>[icon2html(src, user)]Access Denied!</span>")
	return STATUS_CLOSE

/mob/living/silicon/CanUseObjTopic(var/obj/O)
	var/id = src.GetIdCard()
	return O.check_access(id)

/mob/proc/CanUseObjTopic()
	return 1

/obj/proc/CouldUseTopic(var/mob/user)
	user.AddTopicPrint(src)

/mob/proc/AddTopicPrint(var/obj/target)
	target.add_hiddenprint(src)

/mob/living/AddTopicPrint(var/obj/target)
	if(Adjacent(target))
		target.add_fingerprint(src)
	else
		target.add_hiddenprint(src)

/mob/living/silicon/ai/AddTopicPrint(var/obj/target)
	target.add_hiddenprint(src)

/obj/proc/CouldNotUseTopic(var/mob/user)
	// Nada

/obj/item/proc/is_used_on(obj/O, mob/user)

/obj/assume_air(datum/gas_mixture/giver)
	if(loc)
		return loc.assume_air(giver)
	else
		return null

/obj/remove_air(amount)
	if(loc)
		return loc.remove_air(amount)
	else
		return null

/obj/return_air()
	if(loc)
		return loc.return_air()
	else
		return null

/obj/proc/updateUsrDialog()
	if(in_use)
		var/is_in_use = 0
		var/list/nearby = viewers(1, src)
		for(var/mob/M in nearby)
			if ((M.client && M.machine == src))
				is_in_use = 1
				src.attack_hand(M)
		if (istype(usr, /mob/living/silicon/ai) || istype(usr, /mob/living/silicon/robot))
			if (!(usr in nearby))
				if (usr.client && usr.machine==src) // && M.machine == src is omitted because if we triggered this by using the dialog, it doesn't matter if our machine changed in between triggering it and this - the dialog is probably still supposed to refresh.
					is_in_use = 1
					src.attack_ai(usr)
		in_use = is_in_use

/obj/proc/updateDialog()
	// Check that people are actually using the machine. If not, don't update anymore.
	if(in_use)
		var/list/nearby = viewers(1, src)
		var/is_in_use = 0
		for(var/mob/M in nearby)
			if ((M.client && M.machine == src))
				is_in_use = 1
				src.interact(M)
		var/ai_in_use = AutoUpdateAI(src)

		if(!ai_in_use && !is_in_use)
			in_use = 0

/obj/attack_ghost(mob/user)
	ui_interact(user)
	..()

/obj/proc/interact(mob/user)
	return

/mob/proc/unset_machine()
	src.machine = null

/mob/proc/set_machine(var/obj/O)
	if(src.machine)
		unset_machine()
	src.machine = O
	if(istype(O))
		O.in_use = 1

/obj/item/proc/updateSelfDialog()
	var/mob/M = src.loc
	if(istype(M) && M.client && M.machine == src)
		src.attack_self(M)

/obj/proc/hide(var/hide)
	invisibility = hide ? INVISIBILITY_MAXIMUM : initial(invisibility)
	level = hide ? 1 : initial(level)

/obj/proc/hides_under_flooring()
	return level == 1

/obj/proc/hear_talk(mob/M as mob, text, verb, datum/language/speaking)
	if(talking_atom)
		talking_atom.catchMessage(text, M)

/obj/proc/see_emote(mob/M as mob, text, var/emote_type)
	return

/obj/proc/tesla_act(var/power, var/melt = FALSE)
	if(melt)
		visible_message(SPAN_DANGER("\The [src] melts down until ashes are left!"))
		new /obj/effect/decal/cleanable/ash(loc)
		qdel(src)
		return
	being_shocked = 1
	var/power_bounced = power / 2
	tesla_zap(src, 3, power_bounced)
	addtimer(CALLBACK(src, .proc/reset_shocked), 10)

/obj/proc/reset_shocked()
	being_shocked = 0


/obj/proc/show_message(msg, type, alt, alt_type)//Message, type of message (1 or 2), alternative message, alt message type (1 or 2)
	return

//To be called from things that spill objects on the floor.
//Makes an object move around randomly for a couple of tiles
/obj/proc/tumble(var/dist)
	if (dist >= 1)
		spawn()
			dist += rand(0,1)
			for(var/i = 1, i <= dist, i++)
				if(src)
					step(src, pick(NORTH,SOUTH,EAST,WEST))
					sleep(rand(2,4))


/obj/proc/auto_adapt_species(var/mob/living/carbon/human/wearer)
	if(icon_auto_adapt)
		icon_species_tag = ""
		if (loc == wearer && icon_supported_species_tags.len)
			if (wearer.species.short_name in icon_supported_species_tags)
				icon_species_tag = wearer.species.short_name
				return 1
	return 0


//This function should be called on an item when it is:
//Built, autolathed, protolathed, crafted or constructed. At runtime, by players or machines

//It should NOT be called on things that:
//spawn at roundstart, are adminspawned, arrive on shuttles, spawned from vendors, removed from fridges and containers, etc
//This is useful for setting special behaviour for built items that shouldn't apply to those spawned at roundstart
/obj/proc/Created()
	return

/obj/proc/animate_shake()
	var/init_px = pixel_x
	var/shake_dir = pick(-1, 1)
	animate(src, transform = turn(matrix(), 8*shake_dir), pixel_x = init_px + 2*shake_dir, time = 1)
	animate(transform = null, pixel_x = init_px, time = 6, easing = ELASTIC_EASING)

/obj/proc/rotate(var/mob/user, var/anchored_ignore = FALSE)
	if(use_check_and_message(user))
		return
	
	if(anchored && !anchored_ignore)
		to_chat(user, SPAN_WARNING("\The [src] is bolted down to the floor!"))
		return
	
	set_dir(turn(dir, 90))
	update_icon()

/obj/AltClick(var/mob/user)
	if(obj_flags & OBJ_FLAG_ROTATABLE)
		rotate(user)
		return
	if(obj_flags & OBJ_FLAG_ROTATABLE_ANCHORED)
		rotate(user, TRUE)
		return
	..()

/obj/examine(mob/user)
	. = ..()
	if((obj_flags & OBJ_FLAG_ROTATABLE) || (obj_flags & OBJ_FLAG_ROTATABLE_ANCHORED))
		to_chat(user, SPAN_SUBTLE("Can be rotated with alt-click."))

// whether mobs can unequip and drop items into us or not
/obj/proc/can_hold_dropped_items()
	return TRUE