Few fixes (#17993)

Fixes changeling stings becoming unusable after using them once
Fixes transformation sting not being selectable due to having been swapped to absorbed DNA
Fixes extraction sting from not being selectable due to old logic.

code/datums/components/antags/changeling/changeling.dm

@@ -74,12 +74,15 @@ var/list/datum/power/changeling/powerinstances = list()
 
 ///Handles the cooldown for the power. Returns TRUE if the cooldown has passed. FALSE if it's still on cooldown.
 ///This is just a general anti-spam thing and not really a true cooldown
-/datum/component/antag/changeling/proc/handle_cooldown()
+
+/datum/component/antag/changeling/proc/check_cooldown()
 	if(world.time > last_used_sting_time+cooldown_time)
-		last_used_sting_time = world.time
 		return TRUE
 	return FALSE
 
+/datum/component/antag/changeling/proc/set_sting_cooldown()
+	last_used_sting_time = world.time
+
 /datum/component/antag/changeling/proc/get_cooldown(id)
 	return changeling_cooldowns[id]
 
@@ -221,7 +224,7 @@ var/list/datum/power/changeling/powerinstances = list()
 /mob/proc/changeling_power(var/required_chems=0, var/required_dna=0, var/max_genetic_damage=100, var/max_stat=0)
 
 	if(!src.mind)		return
-	if(!iscarbon(src))	return
+	if(!isliving(src))	return
 
 	var/datum/component/antag/changeling/comp = is_changeling(src)
 	if(!comp)
@@ -276,7 +279,7 @@ var/list/datum/power/changeling/powerinstances = list()
 	var/datum/component/antag/changeling/comp = changeling_power(required_chems)
 	if(!comp)
 		return
-	if(!comp.handle_cooldown())
+	if(!comp.check_cooldown())
 		to_chat(src, span_warning("We are still recovering from our last sting."))
 		return
 
@@ -286,8 +289,9 @@ var/list/datum/power/changeling/powerinstances = list()
 	var/mob/living/carbon/T = tgui_input_list(src, "Who will we sting?", "Sting!", victims)
 
 	if(!T)
+		to_chat(src, span_warning("We have no targets in range to sting!"))
 		return
-	if(!comp.handle_cooldown())//Check again in case we have multiple windows open at once.
+	if(!comp.check_cooldown())//Check again in case we have multiple windows open at once.
 		to_chat(src, span_warning("We are still recovering from our last sting."))
 		return
 	if(T.isSynthetic())
@@ -299,6 +303,7 @@ var/list/datum/power/changeling/powerinstances = list()
 
 	comp.chem_charges -= required_chems
 	comp.sting_range = 1
+	comp.set_sting_cooldown()
 
 	to_chat(src, span_notice("We stealthily sting [T]."))
 	var/datum/component/antag/changeling/target_comp = is_changeling(T)

code/datums/components/antags/changeling/powers/extract_dna_sting.dm

@@ -13,14 +13,7 @@
 	set name = "Extract DNA Sting (40)"
 	set desc="Stealthily sting a target to extract their DNA."
 
-	var/datum/component/antag/changeling/changeling = null
-	if(src.mind && changeling)
-		changeling = changeling
-	if(!changeling)
-		return FALSE
-
 	var/mob/living/carbon/human/T = changeling_sting(40, /mob/proc/changeling_extract_dna_sting)
-
 	if(!T)
 		return
 

code/datums/components/antags/changeling/powers/transform_sting.dm

@@ -12,32 +12,41 @@
 	set name = "Transformation sting (40)"
 	set desc="Sting target"
 
-	var/datum/component/antag/changeling/changeling = changeling_power(40)
+	var/datum/component/antag/changeling/changeling = changeling_power(40, 1, 100, CONSCIOUS)
 	if(!changeling)
+		to_world("Changeling = false)")
 		return FALSE
 
 	var/list/names = list()
-	for(var/datum/dna/DNA in changeling.absorbed_dna)
-		names += "[DNA.real_name]"
+	for(var/datum/absorbed_dna/DNA in changeling.absorbed_dna)
+		names += "[DNA.name]"
+	if(!LAZYLEN(names))
+		to_chat(src, "We have no DNA to select from!)")
+		return FALSE
+	var/S
+	if(LAZYLEN(names) > 1)
+		tgui_input_list(src, "Select the target DNA:", "Target DNA", names)
+		to_world("dna > 1")
+	else
+		to_world("dna == 1")
+		S = names[1]
 
-	var/S = tgui_input_list(src, "Select the target DNA:", "Target DNA", names)
-	if(!S)
-		return
-
-	var/datum/dna/chosen_dna = changeling.GetDNA(S)
+	var/datum/absorbed_dna/chosen_dna = changeling.GetDNA(S)
 	if(!chosen_dna)
+		to_world("CD = false)")
 		return
 
 	var/mob/living/carbon/T = changeling_sting(40,/mob/proc/changeling_transformation_sting)
 	if(!T)
+		to_world("T = false)")
 		return FALSE
 	if((HUSK in T.mutations) || (!ishuman(T) && !issmall(T)))
 		to_chat(src, span_warning("Our sting appears ineffective against its DNA."))
 		return FALSE
 	add_attack_logs(src,T,"Transformation sting (changeling)")
 	T.visible_message(span_warning("[T] transforms!"))
-	qdel_swap(T.dna, chosen_dna.Clone())
-	T.real_name = chosen_dna.real_name
+	qdel_swap(T.dna, chosen_dna.dna.Clone())
+	T.real_name = chosen_dna.dna.real_name
 	T.UpdateAppearance()
 	domutcheck(T, null)
 	feedback_add_details("changeling_powers","TS")