Ports the weather system from Nebula. (#18706)

* part 1

* compiles?

* IT WORKS

* vis contents

* fixes

* umbrelloid

* umbrella 2

* dsasdd

* stuff

* lmao

---------

Co-authored-by: Matt Atlas <liermattia@gmail.com>

code/modules/overmap/exoplanets/decor/_areas.dm

@@ -3,6 +3,7 @@
 	ambience = list('sound/effects/wind/wind_2_1.ogg','sound/effects/wind/wind_2_2.ogg','sound/effects/wind/wind_3_1.ogg','sound/effects/wind/wind_4_1.ogg','sound/effects/wind/wind_4_2.ogg','sound/effects/wind/wind_5_1.ogg')
 	always_unpowered = 1
 	area_flags = AREA_FLAG_INDESTRUCTIBLE_TURFS
+	is_outside = OUTSIDE_YES
 
 /area/exoplanet/adhomai
 	name = "Adhomian Wilderness"

code/modules/overmap/exoplanets/decor/_flora.dm

@@ -4,6 +4,8 @@
 	anchored = TRUE
 	density = TRUE
 	var/cutting
+	/// Whether or not you can shelter under this.
+	var/protects_against_weather = FALSE
 
 /obj/structure/flora/proc/dig_up(mob/user)
 	user.visible_message(SPAN_NOTICE("\The [user] begins digging up \the [src]..."))

code/modules/overmap/exoplanets/decor/flora/_tree.dm

@@ -4,6 +4,7 @@
 	density = TRUE
 	layer = 9
 	pixel_x = -16
+	protects_against_weather = TRUE
 	var/max_chop_health = 180
 	var/chop_health = 180 //15 hits with steel hatchet, 5 with wielded fireaxe
 	var/fall_force = 60

code/modules/overmap/exoplanets/exoplanet.dm

@@ -54,6 +54,9 @@
 	var/list/possible_themes = list(/datum/exoplanet_theme)
 	var/datum/exoplanet_theme/theme
 
+	///What weather state to use for this planet initially. If null, will not initialize any weather system. Must be a typepath rather than an instance.
+	var/singleton/state/weather/initial_weather_state = /singleton/state/weather/calm
+
 	var/features_budget = 4
 	var/list/possible_features = list()
 	var/list/spawned_features
@@ -197,6 +200,8 @@
 /obj/effect/overmap/visitable/sector/exoplanet/proc/build_level()
 	generate_habitability()
 	generate_atmosphere()
+	if(ispath(initial_weather_state))
+		generate_weather()
 	generate_flora()
 	generate_map()
 	generate_features()
@@ -533,3 +538,17 @@
 
 /obj/effect/landmark/exoplanet_spawn/proc/do_spawn(obj/effect/overmap/visitable/sector/exoplanet/planet)
 	return
+
+///Resets the given weather state to our planet replacing the old one, and trigger updates. Can be a type path or instance.
+/obj/effect/overmap/visitable/sector/exoplanet/proc/reset_weather(var/singleton/state/weather/W)
+	initial_weather_state = W
+	if(!(z in map_z))
+		return //It's entire possible the levels weren't initialized yet, so don't bother.
+	//Tells all our levels exposed to the sky to force change the weather.
+	SSweather.setup_weather_system(z, initial_weather_state)
+
+///Setup the initial weather state for the planet. Doesn't apply it to our z levels however.
+/obj/effect/overmap/visitable/sector/exoplanet/proc/generate_weather()
+	if(ispath(initial_weather_state))
+		initial_weather_state = GET_SINGLETON(initial_weather_state)
+	reset_weather(initial_weather_state)