Mobs with feather falling 4 boots can now walk and pathfind on clouds

src/main/java/com/minelittlepony/unicopia/InteractionManager.java

@@ -2,6 +2,7 @@ package com.minelittlepony.unicopia;
 
 import java.util.Map;
 import java.util.Optional;
+import java.util.Stack;
 import java.util.UUID;
 
 import org.jetbrains.annotations.NotNull;
@@ -37,7 +38,7 @@ public class InteractionManager {
     @Nullable
     private SyncedConfig config;
 
-    private EquineContext equineContext = EquineContext.ABSENT;
+    private final Stack<EquineContext> equineContext = new Stack<>();
 
     public static InteractionManager getInstance() {
         return INSTANCE;
@@ -109,11 +110,21 @@ public class InteractionManager {
     }
 
     public void setEquineContext(EquineContext context) {
-        equineContext = context;
+        equineContext.push(context);
+    }
+
+    public void clearEquineContext() {
+        if (!equineContext.isEmpty()) {
+            equineContext.pop();
+        }
     }
 
     public EquineContext getEquineContext() {
-        return getClientPony().map(EquineContext.class::cast).orElse(equineContext);
+        return getClientPony().map(EquineContext.class::cast).orElseGet(this::getPathingEquineContext);
+    }
+
+    public EquineContext getPathingEquineContext() {
+        return equineContext.isEmpty() ? EquineContext.ABSENT : equineContext.peek();
     }
 
     public Optional<Pony> getClientPony() {

src/main/java/com/minelittlepony/unicopia/block/cloud/CloudBedBlock.java

@@ -75,6 +75,6 @@ public class CloudBedBlock extends FancyBedBlock implements CloudLike {
     @Override
     @Deprecated
     public boolean canPathfindThrough(BlockState state, BlockView world, BlockPos pos, NavigationType type) {
-        return true;
+        return baseState.canPathfindThrough(world, pos, type);
     }
 }

src/main/java/com/minelittlepony/unicopia/block/cloud/CloudBlock.java

@@ -3,6 +3,7 @@ package com.minelittlepony.unicopia.block.cloud;
 import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.EquineContext;
+import com.minelittlepony.unicopia.InteractionManager;
 import com.minelittlepony.unicopia.entity.player.Pony;
 
 import net.minecraft.block.Block;
@@ -173,7 +174,8 @@ public class CloudBlock extends Block implements CloudLike {
     @Override
     @Deprecated
     public boolean canPathfindThrough(BlockState state, BlockView world, BlockPos pos, NavigationType type) {
-        return true;
+        System.out.println(InteractionManager.getInstance().getPathingEquineContext().collidesWithClouds());
+        return type != NavigationType.LAND || !InteractionManager.getInstance().getPathingEquineContext().collidesWithClouds();
     }
 
     protected VoxelShape getOutlineShape(BlockState state, BlockView world, BlockPos pos, ShapeContext context, EquineContext equineContext) {

src/main/java/com/minelittlepony/unicopia/block/cloud/CloudChestBlock.java

@@ -5,6 +5,7 @@ import java.util.Optional;
 import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.EquineContext;
+import com.minelittlepony.unicopia.InteractionManager;
 import com.minelittlepony.unicopia.block.UBlockEntities;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.ChestBlock;
@@ -139,7 +140,7 @@ public class CloudChestBlock extends ChestBlock implements CloudLike {
     @Override
     @Deprecated
     public boolean canPathfindThrough(BlockState state, BlockView world, BlockPos pos, NavigationType type) {
-        return true;
+        return type != NavigationType.LAND || !InteractionManager.getInstance().getPathingEquineContext().collidesWithClouds();
     }
 
     public static class TileData extends ChestBlockEntity {

src/main/java/com/minelittlepony/unicopia/block/cloud/CloudDoorBlock.java

@@ -3,6 +3,7 @@ package com.minelittlepony.unicopia.block.cloud;
 import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.EquineContext;
+import com.minelittlepony.unicopia.InteractionManager;
 import com.minelittlepony.unicopia.Race;
 
 import net.minecraft.block.BlockSetType;
@@ -10,6 +11,7 @@ import net.minecraft.block.BlockState;
 import net.minecraft.block.DoorBlock;
 import net.minecraft.block.ShapeContext;
 import net.minecraft.entity.Entity;
+import net.minecraft.entity.ai.pathing.NavigationType;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemPlacementContext;
 import net.minecraft.util.ActionResult;
@@ -84,4 +86,10 @@ public class CloudDoorBlock extends DoorBlock implements CloudLike {
             entity.setVelocity(entity.getVelocity().multiply(0.5F, 1, 0.5F));
         }
     }
+
+    @Override
+    @Deprecated
+    public boolean canPathfindThrough(BlockState state, BlockView world, BlockPos pos, NavigationType type) {
+        return !InteractionManager.getInstance().getPathingEquineContext().collidesWithClouds() || super.canPathfindThrough(state, world, pos, type);
+    }
 }

src/main/java/com/minelittlepony/unicopia/block/cloud/CloudStairsBlock.java

@@ -97,6 +97,6 @@ public class CloudStairsBlock extends StairsBlock implements CloudLike {
     @Override
     @Deprecated
     public boolean canPathfindThrough(BlockState state, BlockView world, BlockPos pos, NavigationType type) {
-        return true;
+        return baseBlock.canPathfindThrough(state, world, pos, type);
     }
 }

src/main/java/com/minelittlepony/unicopia/mixin/server/MixinPathNodeMaker.java

@@ -0,0 +1,26 @@
+package com.minelittlepony.unicopia.mixin.server;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import com.minelittlepony.unicopia.EquineContext;
+import com.minelittlepony.unicopia.InteractionManager;
+
+import net.minecraft.entity.ai.pathing.PathNodeMaker;
+import net.minecraft.entity.mob.MobEntity;
+import net.minecraft.world.chunk.ChunkCache;
+
+@Mixin(PathNodeMaker.class)
+abstract class MixinPathNodeMaker {
+    @Inject(method = "init", at = @At("HEAD"))
+    private void onInit(ChunkCache cachedWorld, MobEntity entity, CallbackInfo info) {
+        InteractionManager.getInstance().setEquineContext(EquineContext.of(entity));
+    }
+
+    @Inject(method = "clear", at = @At("HEAD"))
+    private void onClear(CallbackInfo info) {
+        InteractionManager.getInstance().clearEquineContext();
+    }
+}

src/main/java/com/minelittlepony/unicopia/mixin/server/MixinPlayerManager.java

@@ -44,6 +44,6 @@ abstract class MixinPlayerManager {
 
     @Inject(method = "respawnPlayer", at = @At("RETURN"))
     private void afterRespawnPlayer(ServerPlayerEntity player, boolean alive, CallbackInfoReturnable<ServerPlayerEntity> info) {
-        InteractionManager.getInstance().setEquineContext(EquineContext.ABSENT);
+        InteractionManager.getInstance().clearEquineContext();
     }
 }

src/main/resources/unicopia.mixin.json

@@ -54,6 +54,7 @@
     "MixinWorld",
     "PointOfInterestTypesAccessor",
     "server.MixinEntityTrackerEntry",
+    "server.MixinPathNodeMaker",
     "server.MixinPlayerManager",
     "server.MixinServerPlayerEntity",
     "server.MixinServerPlayNetworkHandler",