From 0b5bb3fbf0f93f0a73cff1837e4e054a23132364 Mon Sep 17 00:00:00 2001
From: MistakeNot4892 <AGMogett@gmail.com>
Date: Mon, 22 Mar 2021 13:58:26 +1100
Subject: [PATCH] Allows Teshari to glide in some multiz fall conditions.
 (#7990)

* Allows Teshari to glide in some multiz fall conditions.

* Carried mobs will now fall off you if you go prone.
---
 code/modules/mob/living/carbon/human/human.dm |  3 +
 .../living/carbon/human/species/species.dm    |  3 +
 .../carbon/human/species/station/seromi.dm    | 61 +++++++++++++++++++
 code/modules/mob/living/living.dm             | 12 +++-
 code/modules/multiz/movement.dm               |  6 +-
 5 files changed, 81 insertions(+), 4 deletions(-)

diff --git a/code/modules/mob/living/carbon/human/human.dm b/code/modules/mob/living/carbon/human/human.dm
index 49c0d04013..fd9612abcb 100644
--- a/code/modules/mob/living/carbon/human/human.dm
+++ b/code/modules/mob/living/carbon/human/human.dm
@@ -1617,3 +1617,6 @@
 			to_chat(src, span("warning", "\The [rig]'s visor has shuddenly deactivated!"))
 
 	..()
+
+/mob/living/carbon/human/get_mob_riding_slots()
+	return list(back, head, wear_suit)
diff --git a/code/modules/mob/living/carbon/human/species/species.dm b/code/modules/mob/living/carbon/human/species/species.dm
index 130da51b1b..3302e3417c 100644
--- a/code/modules/mob/living/carbon/human/species/species.dm
+++ b/code/modules/mob/living/carbon/human/species/species.dm
@@ -528,3 +528,6 @@
 	amount *= water_damage_mod
 	if(amount > 0)
 		H.adjustToxLoss(amount)
+
+/datum/species/proc/handle_falling(mob/living/carbon/human/H, atom/hit_atom, damage_min, damage_max, silent, planetary)
+	return FALSE
diff --git a/code/modules/mob/living/carbon/human/species/station/seromi.dm b/code/modules/mob/living/carbon/human/species/station/seromi.dm
index a70feae2de..938a8b1b39 100644
--- a/code/modules/mob/living/carbon/human/species/station/seromi.dm
+++ b/code/modules/mob/living/carbon/human/species/station/seromi.dm
@@ -141,6 +141,67 @@
 		/datum/mob_descriptor/build = -3
 		)
 
+	var/static/list/flight_bodyparts = list(
+		BP_L_ARM,
+		BP_R_ARM,
+		BP_L_HAND,
+		BP_R_HAND
+	)
+	var/static/list/flight_suit_blacklisted_types = list(
+		/obj/item/clothing/suit/space,
+		/obj/item/clothing/suit/straight_jacket
+	)
+
 /datum/species/teshari/equip_survival_gear(var/mob/living/carbon/human/H)
 	..()
 	H.equip_to_slot_or_del(new /obj/item/clothing/shoes/sandal(H),slot_shoes)
+
+/datum/species/teshari/handle_falling(mob/living/carbon/human/H, atom/hit_atom, damage_min, damage_max, silent, planetary)
+
+	// Tesh can glide to save themselves from some falls. Basejumping bird
+	// without parachute, or falling bird without free wings goes splat.
+
+	// Are we landing from orbit, or handcuffed/unconscious/tied to something? 
+	if(planetary || !istype(H) || H.incapacitated())
+		return ..()
+
+	// Are we landing on a turf? Not sure how this could not be the case, but let's be safe.
+	var/turf/landing = get_turf(hit_atom)
+	if(!istype(landing))
+		return ..()
+
+	if(H.buckled)
+		if(!silent)
+			to_chat(H, SPAN_WARNING("You try to spread your wings to slow your fall, but \the [H.buckled] weighs you down!"))
+		return ..()
+
+	// Is there enough air to flap against?
+	var/datum/gas_mixture/environment = landing.return_air()
+	if(!environment || environment.return_pressure() < (ONE_ATMOSPHERE * 0.75))
+		if(!silent)
+			to_chat(H, SPAN_WARNING("You spread your wings to slow your fall, but the air is too thin!"))
+		return ..()
+
+	// Are we wearing a space suit?
+	if(H.wear_suit)
+		for(var/blacklisted_type in flight_suit_blacklisted_types)
+			if(istype(H.wear_suit, blacklisted_type))
+				if(!silent)
+					to_chat(H, SPAN_WARNING("You try to spread your wings to slow your fall, but \the [H.wear_suit] is in the way!"))
+				return ..()
+
+	// Do we have working wings?
+	for(var/bp in flight_bodyparts)
+		var/obj/item/organ/external/E = H.organs_by_name[bp]
+		if(!istype(E) || !E.is_usable() || E.is_broken() || E.is_stump())
+			if(!silent)
+				to_chat(H, SPAN_WARNING("You try to spread your wings to slow your fall, but they won't hold your weight!"))
+			return ..()
+
+	// Handled!
+	if(!silent)
+		to_chat(H, SPAN_NOTICE("You catch the air in your wings and greatly slow your fall."))
+		H.visible_message(SPAN_NOTICE("\The [H] glides down from above, landing safely."))
+		H.Stun(2)
+		playsound(H, "rustle", 25, 1)
+	return TRUE
diff --git a/code/modules/mob/living/living.dm b/code/modules/mob/living/living.dm
index 2abf65b20e..c16bce0c57 100644
--- a/code/modules/mob/living/living.dm
+++ b/code/modules/mob/living/living.dm
@@ -839,8 +839,12 @@
 
 	if(lying)
 		density = 0
-		if(l_hand) unEquip(l_hand)
-		if(r_hand) unEquip(r_hand)
+		if(l_hand) 
+			unEquip(l_hand)
+		if(r_hand) 
+			unEquip(r_hand)
+		for(var/obj/item/weapon/holder/holder in get_mob_riding_slots())
+			unEquip(holder)
 		update_water() // Submerges the mob.
 	else
 		density = initial(density)
@@ -856,6 +860,10 @@
 
 	return canmove
 
+// Mob holders in these slots will be spilled if the mob goes prone.
+/mob/living/proc/get_mob_riding_slots()
+	return list(back)
+
 // Adds overlays for specific modifiers.
 // You'll have to add your own implementation for non-humans currently, just override this proc.
 /mob/living/proc/update_modifier_visuals()
diff --git a/code/modules/multiz/movement.dm b/code/modules/multiz/movement.dm
index 1ca84e1454..ab0be6db78 100644
--- a/code/modules/multiz/movement.dm
+++ b/code/modules/multiz/movement.dm
@@ -442,8 +442,10 @@
 			adjustBruteLoss(rand(damage_min, damage_max))
 		Weaken(4)
 		updatehealth()
-		return
-	return
+
+/mob/living/carbon/human/fall_impact(atom/hit_atom, damage_min, damage_max, silent, planetary)
+	if(!species?.handle_falling(src, hit_atom, damage_min, damage_max, silent, planetary))
+		..()
 
 //Using /atom/movable instead of /obj/item because I'm not sure what all humans can pick up or wear
 /atom/movable