Reworks the syndicate chainsaw (#18252)

* Reworks the syndicate chainsaw

* fixes merge conflict

* not work on dead people

* makes stun absorption removal respect stamina

* requested changes

code/__DEFINES/status_effects.dm

@@ -43,6 +43,8 @@
 
 #define STATUS_EFFECT_BLOOD_RUSH /datum/status_effect/blood_rush // speed boost for gargantua vampires
 
+#define STATUS_EFFECT_CHAINSAW_SLAYING /datum/status_effect/chainsaw_slaying // Stun immunity, very slight damage resistance
+
 
 /////////////
 // DEBUFFS //

code/datums/status_effects/buffs.dm

@@ -51,7 +51,7 @@
 /datum/status_effect/his_grace/on_remove()
 	add_attack_logs(owner, owner, "lost His Grace's stun immunity", ATKLOG_ALL)
 	if(islist(owner.stun_absorption) && owner.stun_absorption["hisgrace"])
-		owner.stun_absorption -= "hisgrace"
+		owner.remove_stun_absorption("hisgrace")
 
 /datum/status_effect/shadow_mend
 	id = "shadow_mend"
@@ -132,7 +132,7 @@
 	add_attack_logs(owner, owner, "lost blood-drunk stun immunity", ATKLOG_ALL)
 	REMOVE_TRAIT(owner, TRAIT_IGNOREDAMAGESLOWDOWN, "blooddrunk")
 	if(islist(owner.stun_absorption) && owner.stun_absorption["blooddrunk"])
-		owner.stun_absorption -= "blooddrunk"
+		owner.remove_stun_absorption("blooddrunk")
 
 /datum/status_effect/bloodswell
 	id = "bloodswell"
@@ -212,7 +212,7 @@
 	var/mob/living/carbon/human/H = owner
 	H.cut_overlay(shield)
 	if(islist(owner.stun_absorption) && owner.stun_absorption["[id]"])
-		owner.stun_absorption -= "[id]"
+		owner.remove_stun_absorption("[id]")
 	H.physiology.stamina_mod /= 0.1
 	H.physiology.brute_mod /= 0.5
 	H.physiology.burn_mod /= 0.5
@@ -393,3 +393,36 @@
 			owner.emote("gasp")
 	cling.genetic_damage += stacks
 	cling = null
+
+/datum/status_effect/chainsaw_slaying
+	id = "chainsaw_slaying"
+	duration = 5 SECONDS
+	status_type = STATUS_EFFECT_REFRESH
+	alert_type = /obj/screen/alert/status_effect/chainsaw
+
+/obj/screen/alert/status_effect/chainsaw
+	name = "Revved up!"
+	desc = "<span class='danger'>... guts, huge guts! Kill them... must kill them all!</span>"
+	icon_state = "chainsaw"
+
+/datum/status_effect/chainsaw_slaying/on_apply()
+	. = ..()
+	if(.)
+		if(ishuman(owner))
+			var/mob/living/carbon/human/H = owner
+			H.physiology.brute_mod *= 0.8
+			H.physiology.burn_mod *= 0.8
+			H.physiology.stamina_mod *= 0.8
+		add_attack_logs(owner, owner, "gained chainsaw stun immunity", ATKLOG_ALL)
+		owner.add_stun_absorption("chainsaw", INFINITY, 4)
+		owner.playsound_local(get_turf(owner), 'sound/effects/singlebeat.ogg', 40, TRUE, use_reverb = FALSE)
+
+/datum/status_effect/chainsaw_slaying/on_remove()
+	add_attack_logs(owner, owner, "lost chainsaw stun immunity", ATKLOG_ALL)
+	if(islist(owner.stun_absorption) && owner.stun_absorption["chainsaw"])
+		owner.remove_stun_absorption("chainsaw")
+	if(ishuman(owner))
+		var/mob/living/carbon/human/H = owner
+		H.physiology.brute_mod /= 0.8
+		H.physiology.burn_mod /=0.8
+		H.physiology.stamina_mod /= 0.8

code/game/objects/items/weapons/twohanded.dm

@@ -625,13 +625,21 @@
 		if(!isliving(target))
 			return
 		else
-			target.Weaken(8 SECONDS)
-			..()
+			user.apply_status_effect(STATUS_EFFECT_CHAINSAW_SLAYING)
+			if(..())
+				target.KnockDown(8 SECONDS)
 		return
 	else
 		playsound(loc, "swing_hit", 50, 1, -1)
 		return ..()
 
+/obj/item/twohanded/chainsaw/hit_reaction(mob/living/carbon/human/owner, atom/movable/hitby, attack_text = "the attack", final_block_chance = 0, damage = 0, attack_type = MELEE_ATTACK)
+	if(attack_type == PROJECTILE_ATTACK)
+		final_block_chance = 0 //It's a chainsaw, you try blocking bullets with it
+	else if(owner.has_status_effect(STATUS_EFFECT_CHAINSAW_SLAYING))
+		final_block_chance = 80 //Need to be ready to ruuuummbllleeee
+	return ..()
+
 /obj/item/twohanded/chainsaw/wield() //you can't disarm an active chainsaw, you crazy person.
 	. = ..()
 	if(.)

code/modules/mob/living/simple_animal/hostile/megafauna/blood_drunk_miner.dm

@@ -115,7 +115,7 @@ Difficulty: Medium
 /obj/item/melee/energy/cleaving_saw/miner/attack(mob/living/target, mob/living/carbon/human/user)
 	target.add_stun_absorption("miner", 10, INFINITY)
 	..()
-	target.stun_absorption -= "miner"
+	target.remove_stun_absorption("miner")
 
 /obj/item/projectile/kinetic/miner
 	damage = 20

code/modules/mob/living/status_procs.dm

@@ -853,6 +853,15 @@ moving up or down retains their old lying angle
 			priority_absorb_key["stuns_absorbed"] += amount
 		return TRUE
 
+/mob/living/proc/remove_stun_absorption(id_flag)
+	stun_absorption -= id_flag
+	if(ishuman(src))
+		var/mob/living/carbon/human/H = src
+		if(H.getStaminaLoss() <= 100)
+			return
+		H.enter_stamcrit()
+
+
 /mob/living/proc/set_shocked()
 	flags_2 |= SHOCKED_2