From dc6ccd3ecc63463e20f3c3698ad40ddfe9877ea9 Mon Sep 17 00:00:00 2001
From: Ryll Ryll <3589655+Ryll-Ryll@users.noreply.github.com>
Date: Mon, 8 Nov 2021 04:36:27 -0500
Subject: [PATCH] Adds yawn propagation (#62639)

---
 code/__DEFINES/cooldowns.dm      |  3 ++
 code/__DEFINES/mobs.dm           |  2 ++
 code/modules/mob/living/emote.dm | 47 ++++++++++++++++++++++++++++++++
 3 files changed, 52 insertions(+)

diff --git a/code/__DEFINES/cooldowns.dm b/code/__DEFINES/cooldowns.dm
index 6bca58aac18..a2210386ad5 100644
--- a/code/__DEFINES/cooldowns.dm
+++ b/code/__DEFINES/cooldowns.dm
@@ -52,6 +52,9 @@
 #define COOLDOWN_CIRCUIT_PATHFIND_DIF "circuit_pathfind_different"
 #define COOLDOWN_CIRCUIT_TARGET_INTERCEPT "circuit_target_intercept"
 
+// mob cooldowns
+#define COOLDOWN_YAWN_PROPAGATION "yawn_propagation_cooldown"
+
 //TIMER COOLDOWN MACROS
 
 #define COMSIG_CD_STOP(cd_index) "cooldown_[cd_index]"
diff --git a/code/__DEFINES/mobs.dm b/code/__DEFINES/mobs.dm
index 79d99c5f655..e58071e5874 100644
--- a/code/__DEFINES/mobs.dm
+++ b/code/__DEFINES/mobs.dm
@@ -415,6 +415,8 @@
 #define EXAMINE_MORE_WINDOW 1 SECONDS
 /// If you examine another mob who's successfully examined you during this duration of time, you two try to make eye contact. Cute!
 #define EYE_CONTACT_WINDOW 2 SECONDS
+/// If you yawn while someone nearby has examined you within this time frame, it will force them to yawn as well. Tradecraft!
+#define YAWN_PROPAGATION_EXAMINE_WINDOW 2 SECONDS
 
 /// How far away you can be to make eye contact with someone while examining
 #define EYE_CONTACT_RANGE 5
diff --git a/code/modules/mob/living/emote.dm b/code/modules/mob/living/emote.dm
index 424d509c4a4..ab313f02e18 100644
--- a/code/modules/mob/living/emote.dm
+++ b/code/modules/mob/living/emote.dm
@@ -414,11 +414,58 @@
 	key_third_person = "wsmiles"
 	message = "smiles weakly."
 
+/// The base chance for your yawn to propagate to someone else if they're on the same tile as you
+#define YAWN_PROPAGATE_CHANCE_BASE 60
+/// The base chance for your yawn to propagate to someone else if they're on the same tile as you
+#define YAWN_PROPAGATE_CHANCE_DECAY 10
+
 /datum/emote/living/yawn
 	key = "yawn"
 	key_third_person = "yawns"
 	message = "yawns."
 	emote_type = EMOTE_AUDIBLE
+	cooldown = 3 SECONDS
+
+/datum/emote/living/yawn/run_emote(mob/user, params, type_override, intentional)
+	. = ..()
+	if(!. || !isliving(user))
+		return
+
+	if(!TIMER_COOLDOWN_CHECK(user, COOLDOWN_YAWN_PROPAGATION))
+		TIMER_COOLDOWN_START(user, COOLDOWN_YAWN_PROPAGATION, cooldown * 3)
+
+	var/mob/living/carbon/carbon_user = user
+	if(istype(carbon_user) && ((carbon_user.wear_mask?.flags_inv & HIDEFACE) || carbon_user.head?.flags_inv & HIDEFACE))
+		return // if your face is obscured, skip propagation
+
+	var/propagation_distance = user.client ? 5 : 2 // mindless mobs are less able to spread yawns
+
+	for(var/mob/living/iter_living in view(user, propagation_distance))
+		if(IS_DEAD_OR_INCAP(iter_living) || TIMER_COOLDOWN_CHECK(user, COOLDOWN_YAWN_PROPAGATION))
+			continue
+
+		var/dist_between = get_dist(user, iter_living)
+		var/recently_examined = FALSE // if you yawn just after someone looks at you, it forces them to yawn as well. Tradecraft!
+
+		if(iter_living.client)
+			var/examine_time = LAZYACCESS(iter_living.client?.recent_examines, user)
+			if(examine_time && (world.time - examine_time < YAWN_PROPAGATION_EXAMINE_WINDOW))
+				recently_examined = TRUE
+
+		if(!recently_examined && !prob(YAWN_PROPAGATE_CHANCE_BASE - (YAWN_PROPAGATE_CHANCE_DECAY * dist_between)))
+			continue
+
+		var/yawn_delay = rand(0.25 SECONDS, 0.75 SECONDS) * dist_between
+		addtimer(CALLBACK(src, .proc/propagate_yawn, iter_living), yawn_delay)
+
+/// This yawn has been triggered by someone else yawning specifically, likely after a delay. Check again if they don't have the yawned recently trait
+/datum/emote/living/yawn/proc/propagate_yawn(mob/user)
+	if(!istype(user) || TIMER_COOLDOWN_CHECK(user, COOLDOWN_YAWN_PROPAGATION))
+		return
+	user.emote("yawn")
+
+#undef YAWN_PROPAGATE_CHANCE_BASE
+#undef YAWN_PROPAGATE_CHANCE_DECAY
 
 /datum/emote/living/gurgle
 	key = "gurgle"