Merge pull request #323 from DoctorMacc/gamerule

Add doDaylightCycle gamerule support

connector/src/main/java/org/geysermc/connector/network/translators/java/world/JavaUpdateTimeTranslator.java

@@ -25,6 +25,10 @@
 
 package org.geysermc.connector.network.translators.java.world;
 
+import com.nukkitx.protocol.bedrock.data.GameRuleData;
+import com.nukkitx.protocol.bedrock.packet.GameRulesChangedPacket;
+import it.unimi.dsi.fastutil.longs.Long2LongMap;
+import it.unimi.dsi.fastutil.longs.Long2LongOpenHashMap;
 import org.geysermc.connector.network.session.GeyserSession;
 import org.geysermc.connector.network.translators.PacketTranslator;
 import org.geysermc.connector.network.translators.Translator;
@@ -35,11 +39,37 @@ import com.nukkitx.protocol.bedrock.packet.SetTimePacket;
 @Translator(packet = ServerUpdateTimePacket.class)
 public class JavaUpdateTimeTranslator extends PacketTranslator<ServerUpdateTimePacket> {
 
+    // If negative, the last time is stored so we know it's not some plugin behavior doing weird things.
+    // Per-player for multi-world support
+    private static final Long2LongMap LAST_RECORDED_TIMES = new Long2LongOpenHashMap();
+
     @Override
     public void translate(ServerUpdateTimePacket packet, GeyserSession session) {
+
+        // Bedrock sends a GameRulesChangedPacket if there is no daylight cycle
+        // Java just sends a negative long if there is no daylight cycle
+        long lastTime = LAST_RECORDED_TIMES.getOrDefault(session.getPlayerEntity().getEntityId(), 0);
+        long time = packet.getTime();
+
+        if (lastTime != time) {
             // https://minecraft.gamepedia.com/Day-night_cycle#24-hour_Minecraft_day
             SetTimePacket setTimePacket = new SetTimePacket();
-        setTimePacket.setTime((int) Math.abs(packet.getTime()) % 24000);
+            setTimePacket.setTime((int) Math.abs(time) % 24000);
             session.getUpstream().sendPacket(setTimePacket);
+            // TODO: Performance efficient to always do this?
+            LAST_RECORDED_TIMES.put(session.getPlayerEntity().getEntityId(), time);
         }
+        if (lastTime < 0 && time >= 0) {
+            setDoDaylightCycleGamerule(session, true);
+        } else if (lastTime != time && time < 0) {
+            setDoDaylightCycleGamerule(session, false);
+        }
+    }
+
+    private void setDoDaylightCycleGamerule(GeyserSession session, boolean doCycle) {
+        GameRulesChangedPacket gameRulesChangedPacket = new GameRulesChangedPacket();
+        gameRulesChangedPacket.getGameRules().add(new GameRuleData<>("dodaylightcycle", doCycle));
+        session.getUpstream().sendPacket(gameRulesChangedPacket);
+    }
+
 }