/*
	Telekinesis

	This needs more thinking out, but I might as well.
*/
var/const/tk_maxrange = 15

/*
	Telekinetic attack:

	By default, emulate the user's unarmed attack
*/
/atom/proc/attack_tk(mob/user)
	if(user.stat) return
	user.UnarmedAttack(src,0) // attack_hand, attack_paw, etc
	return

/*
	This is similar to item attack_self, but applies to anything
	that you can grab with a telekinetic grab.

	It is used for manipulating things at range, for example, opening and closing closets.
	There are not a lot of defaults at this time, add more where appropriate.
*/
/atom/proc/attack_self_tk(mob/user)
	return

/obj/attack_tk(mob/user)
	if(user.stat) return
	if(anchored)
		..()
		return

	var/obj/item/tk_grab/O = new(src)
	user.put_in_active_hand(O)
	O.host = user
	O.focus_object(src)
	return

/obj/item/attack_tk(mob/user)
	if(user.stat || !isturf(loc)) return
	if((M_TK in user.mutations) && !user.get_active_hand()) // both should already be true to get here
		var/obj/item/tk_grab/O = new(src)
		user.put_in_active_hand(O)
		O.host = user
		O.focus_object(src)
	else
		warning("Strange attack_tk(): TK([M_TK in user.mutations]) empty hand([!user.get_active_hand()])")
	return


/mob/attack_tk(mob/user)
	return // needs more thinking about

/*
	TK Grab Item (the workhorse of old TK)

	* If you have not grabbed something, do a normal tk attack
	* If you have something, throw it at the target.  If it is already adjacent, do a normal attackby()
	* If you click what you are holding, or attack_self(), do an attack_self_tk() on it.
	* Deletes itself if it is ever not in your hand, or if you should have no access to TK.
*/
/obj/item/tk_grab
	name = "Telekinetic Grab"
	desc = "Magic"
	icon = 'icons/obj/magic.dmi'//Needs sprites
	icon_state = "2"
	flags = NOBLUDGEON
	//item_state = null
	w_class = 10.0
	layer = 20

	var/last_throw = 0
	var/atom/movable/focus = null
	var/mob/living/host = null


	dropped(mob/user as mob)
		if(focus && user && loc != user && loc != user.loc) // drop_item() gets called when you tk-attack a table/closet with an item
			if(focus.Adjacent(loc))
				focus.loc = loc

		del(src)
		return


	//stops TK grabs being equipped anywhere but into hands
	equipped(var/mob/user, var/slot)
		if( (slot == slot_l_hand) || (slot== slot_r_hand) )	return
		del(src)
		return


	attack_self(mob/user as mob)
		if(focus)
			focus.attack_self_tk(user)

	afterattack(atom/target as mob|obj|turf|area, mob/living/user as mob|obj, proximity)//TODO: go over this
		if(!target || !user)	return
		if(last_throw+3 > world.time)	return
		if(!host || host != user)
			del(src)
			return
		if(!(M_TK in host.mutations))
			del(src)
			return
		if(isobj(target) && !isturf(target.loc))
			return

		var/d = get_dist(user, target)
		if(focus)
			d = max(d,get_dist(user,focus)) // whichever is further
		/*switch(d)
			if(0)
				;
			if(1 to 5) // not adjacent may mean blocked by window
				if(!proximity)
					user.next_move += 2
			if(5 to 7)
				user.next_move += 5
			if(8 to tk_maxrange)
				user.next_move += 10
			else
				user << "\blue Your mind won't reach that far."
				return*/
		if(d > tk_maxrange)
			user << "<span class='warning'>Your mind won't reach that far.</span>"
			return

		if(!focus)
			focus_object(target, user)
			return

		if(target == focus)
			target.attack_self_tk(user)
			return // todo: something like attack_self not laden with assumptions inherent to attack_self


		if(!istype(target, /turf) && istype(focus,/obj/item) && target.Adjacent(focus))
			var/obj/item/I = focus
			var/resolved = target.attackby(I, user, user:get_organ_target())
			if(!resolved && target && I)
				I.afterattack(target,user,1) // for splashing with beakers


		else
			apply_focus_overlay()
			focus.throw_at(target, 10, 1)
			last_throw = world.time
		return

	attack(mob/living/M as mob, mob/living/user as mob, def_zone)
		return


	proc/focus_object(var/obj/target, var/mob/living/user)
		if(!istype(target,/obj))	return//Cant throw non objects atm might let it do mobs later
		if(target.anchored || !isturf(target.loc))
			del src
			return
		focus = target
		update_icon()
		apply_focus_overlay()
		return


	proc/apply_focus_overlay()
		if(!focus)	return
		var/obj/effect/overlay/O = new /obj/effect/overlay(locate(focus.x,focus.y,focus.z))
		O.name = "sparkles"
		O.anchored = 1
		O.density = 0
		O.layer = FLY_LAYER
		O.dir = pick(cardinal)
		O.icon = 'icons/effects/effects.dmi'
		O.icon_state = "nothing"
		flick("empdisable",O)
		spawn(5)
			O.delete()
		return


	update_icon()
		overlays.Cut()
		if(focus && focus.icon && focus.icon_state)
			overlays += icon(focus.icon,focus.icon_state)
		return

/*Not quite done likely needs to use something thats not get_step_to
	proc/check_path()
		var/turf/ref = get_turf(src.loc)
		var/turf/target = get_turf(focus.loc)
		if(!ref || !target)	return 0
		var/distance = get_dist(ref, target)
		if(distance >= 10)	return 0
		for(var/i = 1 to distance)
			ref = get_step_to(ref, target, 0)
		if(ref != target)	return 0
		return 1
*/

//equip_to_slot_or_del(obj/item/W, slot, del_on_fail = 1)
/*
		if(istype(user, /mob/living/carbon))
			if(user:mutations & M_TK && get_dist(source, user) <= 7)
				if(user:get_active_hand())	return 0
				var/X = source:x
				var/Y = source:y
				var/Z = source:z

*/