#define EFFECT_COOLDOWN 0.5 SECONDS

/obj/effect/portal
	name = "portal"
	desc = "Result of bluespace high tech development."
	icon = 'icons/obj/stationobjs.dmi'
	icon_state = "portal"

	var/obj/item/target = null
	/// The UID and `name` of the object that created this portal. For example, a wormhole jaunter.
	var/list/creation_obj_data
	/// The ckey of the mob which was responsible for the creation of the portal. For example, the mob who used a wormhole jaunter.
	var/creation_mob_ckey

	var/failchance = 0
	var/fail_icon = "portal1"

	/// How close to the portal you will teleport. FALSE = on the portal, TRUE = adjacent
	var/precision = FALSE
	var/can_multitool_to_remove = FALSE
	var/ignore_tele_proof_area_setting = FALSE
	var/one_use = FALSE // Does this portal go away after one teleport?
	/// The time after which the effects should play again. Too many effects can lag the server
	var/effect_cooldown = 0
	///Whether or not portal use will cause sparks
	var/create_sparks = TRUE
	var/teleports_this_cycle = 0

/obj/effect/portal/New(loc, turf/_target, obj/creation_object = null, lifespan = 300, mob/creation_mob = null, create_sparks = TRUE)
	..()

	GLOB.portals += src

	target = _target
	if(creation_object)
		creation_obj_data = list(creation_object.UID(), "[creation_object.name]") // Store the name incase the object is deleted.
	else
		creation_obj_data = list(null, null)
	creation_mob_ckey = creation_mob?.ckey
	START_PROCESSING(SSobj, src)

	if(lifespan > 0)
		QDEL_IN(src, lifespan)

/obj/effect/portal/Destroy()
	GLOB.portals -= src
	var/obj/O = locateUID(creation_obj_data[1])
	if(!QDELETED(O))
		O.portal_destroyed(src)
	target = null
	if(create_sparks)
		do_sparks(5, 0, loc)
	STOP_PROCESSING(SSobj, src)
	return ..()

/obj/effect/portal/process()
	teleports_this_cycle = 0

/obj/effect/portal/singularity_pull()
	return

/obj/effect/portal/singularity_act()
	return

/obj/effect/portal/Crossed(atom/movable/AM, oldloc)
	if(isobserver(AM))
		return ..()

	if(target && (get_turf(oldloc) == get_turf(target)))
		return ..()

	if(!teleport(AM))
		return ..()

/obj/effect/portal/attack_tk(mob/user)
	return

/obj/effect/portal/attack_hand(mob/user)
	. = ..()
	if(.)
		return
	if(get_turf(user) == get_turf(src))
		teleport(user)
	if(Adjacent(user))
		user.forceMove(get_turf(src))

/obj/effect/portal/attack_ghost(mob/dead/observer/O)
	if(target)
		O.forceMove(get_turf(target))

/obj/effect/portal/multitool_act(mob/user, obj/item/I)
	. = TRUE
	if(!I.use_tool(src, user, 0, volume = I.tool_volume))
		return
	if(can_multitool_to_remove)
		qdel(src)
	else
		user.forceMove(get_turf(src))

/obj/effect/portal/proc/can_teleport(atom/movable/M)
	. = TRUE

	if(!istype(M))
		. = FALSE

	if(!M.simulated || iseffect(M))
		. = FALSE

/obj/effect/portal/proc/teleport(atom/movable/M)
	if(!can_teleport(M))
		return FALSE

	if(!target)
		qdel(src)
		return FALSE

	if(ismegafauna(M))
		var/creator_string = ""
		var/obj_name = creation_obj_data[2]
		if(creation_mob_ckey)
			creator_string = " created by [key_name_admin(GLOB.directory[creation_mob_ckey])][obj_name ? " using \a [obj_name]" : ""]"
		else if(obj_name)
			creator_string = " created by \a [obj_name]"
		message_admins("[M] has used a portal at [ADMIN_VERBOSEJMP(src)][creator_string].")

	if(prob(failchance))
		icon_state = fail_icon
		var/list/target_z = levels_by_trait(SPAWN_RUINS)
		target_z -= M.z
		if(!attempt_teleport(M, locate(rand(5, world.maxx - 5), rand(5, world.maxy -5), pick(target_z)), 0, FALSE)) // Try to send them to deep space.
			return FALSE
	else
		if(!attempt_teleport(M, target, precision)) // Try to send them to a turf adjacent to target.
			return FALSE
	if(one_use)
		qdel(src)

	return TRUE

/obj/effect/portal/proc/attempt_teleport(atom/movable/victim, turf/destination, variance = 0, force_teleport = TRUE)
	if(teleports_this_cycle >= MAX_ALLOWED_TELEPORTS_PER_PROCESS)
		return
	var/use_effects = world.time >= effect_cooldown
	var/effect = null // Will result in the default effect being used
	if(!use_effects)
		effect = NONE // No effect

	if(!do_teleport(victim, destination, variance, force_teleport, effect, effect, bypass_area_flag = ignore_tele_proof_area_setting))
		invalid_teleport()
		return FALSE
	effect_cooldown = world.time + EFFECT_COOLDOWN
	teleports_this_cycle++
	return TRUE

/obj/effect/portal/proc/invalid_teleport()
	visible_message("<span class='warning'>[src] flickers and fails due to bluespace interference!</span>")
	if(create_sparks)
		do_sparks(5, 0, loc)
	qdel(src)

#define UNSTABLE_TIME_DELAY 2 SECONDS

/obj/effect/portal/hand_tele
	/// After you touch the portal, it will be unstable with high bad teleport chance, this variable contains time when it will be fine again
	var/unstable_time = 0
	/// If this is TRUE, you will not be able to teleport with that portal
	var/inactive = FALSE

/obj/effect/portal/hand_tele/examine(mob/user, infix, suffix)
	. = ..()
	if(unstable_time > world.time)
		. += "<span class='warning'>[src] is shaking, it looks very unstable!</span>"

/obj/effect/portal/hand_tele/can_teleport(atom/movable/M)
	if(inactive)
		return FALSE
	return ..()

/obj/effect/portal/hand_tele/teleport(atom/movable/M)
	. = ..()
	adjust_unstable()

/obj/effect/portal/hand_tele/proc/adjust_unstable()
	unstable_time = world.time + UNSTABLE_TIME_DELAY
	icon_state = fail_icon
	failchance = 33
	inactive = TRUE
	addtimer(CALLBACK(src, PROC_REF(check_unstable), unstable_time), UNSTABLE_TIME_DELAY)
	addtimer(VARSET_CALLBACK(src, inactive, FALSE), 0.5 SECONDS) // after unstable is setted you have 0.5 safe seconds to think if you want to use it

/obj/effect/portal/hand_tele/proc/check_unstable(current_unstable_time)
	if(current_unstable_time != unstable_time)
		return
	icon_state = initial(icon_state)
	failchance = 0

#undef UNSTABLE_TIME_DELAY

/obj/effect/portal/advanced
	name = "advanced portal"
	desc = "A portal capable of bypassing bluespace interference."
	icon_state = "portal1"
	failchance = 0
	precision = 0
	ignore_tele_proof_area_setting = TRUE

#undef EFFECT_COOLDOWN