Ports TG's Weather System

code/controllers/Processes/weather.dm

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+//Used for all kinds of weather, ex. lavaland ash storms.
+var/global/datum/controller/process/weather/weather_master
+
+/datum/controller/process/weather
+	var/list/processing_weather = list()
+	var/list/existing_weather = list()
+	var/list/eligible_zlevels = list(/*ZLEVEL_ASTEROID*/)
+
+/datum/controller/process/weather/setup()
+	name = "weather"
+	schedule_interval = 10
+	weather_master = src
+
+	for(var/V in subtypesof(/datum/weather))
+		var/datum/weather/W = V
+		existing_weather |= new W
+
+/datum/controller/process/weather/statProcess()
+	..()
+	stat(null, "[processing_weather.len] weather")
+
+/datum/controller/process/weather/doWork()
+	for(var/V in processing_weather)
+		var/datum/weather/W = V
+		if(W.aesthetic)
+			continue
+		for(var/mob/living/L in mob_list)
+			if(W.can_impact(L))
+				W.impact(L)
+				SCHECK
+	for(var/Z in eligible_zlevels)
+		var/list/possible_weather_for_this_z = list()
+		for(var/V in existing_weather)
+			var/datum/weather/WE = V
+			if(WE.target_z == Z && WE.probability) //Another check so that it doesn't run extra weather
+				possible_weather_for_this_z[WE] = WE.probability
+		var/datum/weather/W = pickweight(possible_weather_for_this_z)
+		run_weather(W.name)
+		eligible_zlevels -= Z
+		addtimer(src, "make_z_eligible", rand(3000, 6000) + W.weather_duration_upper, TRUE, Z) //Around 5-10 minutes between weathers
+		SCHECK
+
+/datum/controller/process/weather/proc/run_weather(weather_name)
+	if(!weather_name)
+		return
+	for(var/V in existing_weather)
+		var/datum/weather/W = V
+		if(W.name == weather_name)
+			W.telegraph()
+			SCHECK
+
+/datum/controller/process/weather/proc/make_z_eligible(zlevel)
+	eligible_zlevels |= zlevel