Add WeatherModule

common/src/main/kotlin/com/bluedragonmc/server/module/vanilla/WeatherModule.kt

@@ -0,0 +1,44 @@
+package com.bluedragonmc.server.module.vanilla
+
+import com.bluedragonmc.server.Game
+import com.bluedragonmc.server.event.PlayerLeaveGameEvent
+import com.bluedragonmc.server.module.GameModule
+import net.minestom.server.event.Event
+import net.minestom.server.event.EventNode
+import net.minestom.server.event.player.PlayerSpawnEvent
+import net.minestom.server.instance.Instance
+import net.minestom.server.network.packet.server.play.ChangeGameStatePacket
+import net.minestom.server.tag.Tag
+
+class WeatherModule(private var globalRaining: Boolean = false) : GameModule() {
+
+    private val RAINING = Tag.Boolean("weather:raining").defaultValue(false)
+    private lateinit var parent: Game
+
+    override fun initialize(parent: Game, eventNode: EventNode<Event>) {
+        this.parent = parent
+        eventNode.addListener(PlayerSpawnEvent::class.java) { event ->
+            event.player.sendPacket(getRainPacket(globalRaining || event.spawnInstance.getTag(RAINING)))
+        }
+        eventNode.addListener(PlayerLeaveGameEvent::class.java) { event ->
+            event.player.sendPacket(getRainPacket(false))
+        }
+    }
+
+    fun setRaining(instance: Instance, raining: Boolean) {
+        val packet = getRainPacket(raining)
+        instance.sendGroupedPacket(packet)
+        instance.setTag(RAINING, raining)
+    }
+
+    fun setRaining(raining: Boolean) {
+        val packet = getRainPacket(raining)
+        parent.sendGroupedPacket(packet)
+        globalRaining = raining
+    }
+
+    private fun getRainPacket(raining: Boolean) = ChangeGameStatePacket(
+        if (raining) ChangeGameStatePacket.Reason.BEGIN_RAINING else ChangeGameStatePacket.Reason.END_RAINING,
+        0f
+    )
+}