Terror spider event types now depend on server pop (#13874)

* Terror spider events now depend on server pop

* split off from PR 13657

* farie suggestion

* convert var/highpop_trigger to #define TS_HIGHPOP_TRIGGER

* newline

* re-run mapdiffbot

Co-authored-by: Kyep <Kyep@users.noreply.github.com>

code/modules/events/spider_terror.dm

@@ -1,3 +1,4 @@
+#define TS_HIGHPOP_TRIGGER 80
 
 /datum/event/spider_terror
 	announceWhen = 240
@@ -22,23 +23,32 @@
 			if(temp_vent.parent.other_atmosmch.len > 50)
 				vents += temp_vent
 	var/spider_type
-	var/infestation_type = pick(1, 2, 3, 4, 5)
+	var/infestation_type
+	if((length(GLOB.clients)) < TS_HIGHPOP_TRIGGER)
+		infestation_type = pick(1, 2, 3, 4)
+	else
+		infestation_type = pick(2, 3, 4, 5)
 	switch(infestation_type)
 		if(1)
+			// Weakest, only used during lowpop.
 			spider_type = /mob/living/simple_animal/hostile/poison/terror_spider/green
 			spawncount = 5
 		if(2)
-			spider_type = /mob/living/simple_animal/hostile/poison/terror_spider/white
-			spawncount = 2
-		if(3)
+			// Fairly weak. Dangerous in single combat but has little staying power. Always gets whittled down.
 			spider_type = /mob/living/simple_animal/hostile/poison/terror_spider/prince
 			spawncount = 1
+		if(3)
+			// Variable. Depends how many they infect.
+			spider_type = /mob/living/simple_animal/hostile/poison/terror_spider/white
+			spawncount = 2
 		if(4)
-			spider_type = /mob/living/simple_animal/hostile/poison/terror_spider/queen
-			spawncount = 1
-		if(5)
+			// Pretty strong.
 			spider_type = /mob/living/simple_animal/hostile/poison/terror_spider/princess
 			spawncount = 2
+		if(5)
+			// Strongest, only used during highpop.
+			spider_type = /mob/living/simple_animal/hostile/poison/terror_spider/queen
+			spawncount = 1
 	while(spawncount >= 1 && vents.len)
 		var/obj/machinery/atmospherics/unary/vent_pump/vent = pick(vents)
 
@@ -60,3 +70,6 @@
 			new spider_type(vent.loc)
 			spawncount--
 
+
+#undef TS_HIGHPOP_TRIGGER
+