Start adding support for crafting

Expect bugs

connector/src/main/java/org/geysermc/connector/inventory/Inventory.java

@@ -52,7 +52,6 @@ public class Inventory {
     @Setter
     protected String title;
 
-    @Getter
     @Setter
     protected ItemStack[] items;
 
@@ -82,4 +81,10 @@ public class Inventory {
     public ItemStack getItem(int slot) {
         return items[slot];
     }
+
+    public void setItem(int slot, ItemStack item) {
+        if (item != null && (item.getId() == 0 || item.getAmount() < 1))
+            item = null;
+        items[slot] = item;
+    }
 }

connector/src/main/java/org/geysermc/connector/inventory/PlayerInventory.java

@@ -44,7 +44,7 @@ public class PlayerInventory extends Inventory {
     }
 
     public void setCursor(ItemStack stack) {
-        if (stack != null && stack.getId() == 0)
+        if (stack != null && (stack.getId() == 0 || stack.getAmount() < 1))
             stack = null;
         cursor = stack;
     }

connector/src/main/java/org/geysermc/connector/network/session/GeyserSession.java

@@ -105,11 +105,9 @@ public class GeyserSession implements Player {
     @Setter
     private GameMode gameMode = GameMode.SURVIVAL;
 
-    @Getter
     @Setter
-    private int lastClickedSlot;
+    private int craftSlot = 0;
 
-    @Getter
     @Setter
     private int reopeningWindow = -1;
 

connector/src/main/java/org/geysermc/connector/network/translators/TranslatorsInit.java

@@ -99,6 +99,7 @@ public class TranslatorsInit {
         Registry.registerJava(ServerRespawnPacket.class, new JavaRespawnTranslator());
         Registry.registerJava(ServerSpawnPositionPacket.class, new JavaSpawnPositionTranslator());
         Registry.registerJava(ServerDifficultyPacket.class, new JavaDifficultyTranslator());
+        Registry.registerJava(ServerDeclareRecipesPacket.class, new JavaDeclareRecipesTranslator());
 
         Registry.registerJava(ServerEntityAnimationPacket.class, new JavaEntityAnimationTranslator());
         Registry.registerJava(ServerEntityPositionPacket.class, new JavaEntityPositionTranslator());
@@ -181,7 +182,7 @@ public class TranslatorsInit {
 
         inventoryTranslators.put(WindowType.GENERIC_3X3, new BlockInventoryTranslator(9, 23 << 4, ContainerType.DISPENSER));
         inventoryTranslators.put(WindowType.HOPPER, new BlockInventoryTranslator(5, 154 << 4, ContainerType.HOPPER));
-        inventoryTranslators.put(WindowType.SHULKER_BOX, new BlockInventoryTranslator(36, 205 << 4, ContainerType.CONTAINER));
+        inventoryTranslators.put(WindowType.SHULKER_BOX, new BlockInventoryTranslator(27, 205 << 4, ContainerType.CONTAINER));
         //inventoryTranslators.put(WindowType.BEACON, new BlockInventoryTranslator(1, 138 << 4, ContainerType.BEACON)); //TODO
     }
 }

connector/src/main/java/org/geysermc/connector/network/translators/bedrock/BedrockInventoryTransactionTranslator.java

@@ -26,6 +26,7 @@
 package org.geysermc.connector.network.translators.bedrock;
 
 import com.github.steveice10.mc.protocol.data.game.window.*;
+import com.github.steveice10.mc.protocol.packet.ingame.client.window.ClientConfirmTransactionPacket;
 import com.github.steveice10.mc.protocol.packet.ingame.client.window.ClientCreativeInventoryActionPacket;
 import com.github.steveice10.mc.protocol.packet.ingame.client.window.ClientRenameItemPacket;
 import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
@@ -49,27 +50,36 @@ import com.nukkitx.protocol.bedrock.packet.InventorySlotPacket;
 import com.nukkitx.protocol.bedrock.packet.InventoryTransactionPacket;
 import org.geysermc.connector.entity.Entity;
 import org.geysermc.connector.inventory.Inventory;
+import org.geysermc.connector.inventory.PlayerInventory;
 import org.geysermc.connector.network.session.GeyserSession;
 import org.geysermc.connector.network.translators.PacketTranslator;
 import org.geysermc.connector.network.translators.TranslatorsInit;
 import org.geysermc.connector.network.translators.inventory.InventoryTranslator;
-import org.geysermc.connector.utils.InventoryUtils;
 
-import java.util.ArrayList;
+import java.util.*;
-import java.util.List;
-import java.util.Objects;
 
 public class BedrockInventoryTransactionTranslator extends PacketTranslator<InventoryTransactionPacket> {
+    private final ItemStack refreshItem = new ItemStack(1, 127, new CompoundTag(""));
 
     @Override
     public void translate(InventoryTransactionPacket packet, GeyserSession session) {
         switch (packet.getTransactionType()) {
             case NORMAL:
+                for (InventoryAction action : packet.getActions()) {
+                    if (action.getSource().getContainerId() == ContainerId.CRAFTING_USE_INGREDIENT ||
+                            action.getSource().getContainerId() == ContainerId.CRAFTING_RESULT) {
+                        return;
+                    }
+                }
+
                 Inventory inventory = session.getInventoryCache().getOpenInventory();
                 if (inventory == null)
                     inventory = session.getInventory();
                 InventoryTranslator translator = TranslatorsInit.getInventoryTranslators().get(inventory.getWindowType());
 
+                int craftSlot = session.getCraftSlot();
+                session.setCraftSlot(0);
+
                 if (session.getGameMode() == GameMode.CREATIVE && inventory.getId() == 0) {
                     ItemStack javaItem;
                     for (InventoryAction action : packet.getActions()) {
@@ -87,17 +97,18 @@ public class BedrockInventoryTransactionTranslator extends PacketTranslator<Inve
                                         break;
                                     }
                                 }
-                                ClientCreativeInventoryActionPacket creativePacket = new ClientCreativeInventoryActionPacket(javaSlot, InventoryUtils.fixStack(javaItem));
+                                ClientCreativeInventoryActionPacket creativePacket = new ClientCreativeInventoryActionPacket(javaSlot, fixStack(javaItem));
                                 session.getDownstream().getSession().send(creativePacket);
-                                inventory.getItems()[javaSlot] = javaItem;
+                                inventory.setItem(javaSlot, javaItem);
                                 break;
                             case ContainerId.NONE:
-                                if (action.getSource().getType() == InventorySource.Type.WORLD_INTERACTION && action.getSource().getFlag() == InventorySource.Flag.DROP_ITEM) {
+                                if (action.getSource().getType() == InventorySource.Type.WORLD_INTERACTION &&
+                                        action.getSource().getFlag() == InventorySource.Flag.DROP_ITEM) {
                                     javaItem = TranslatorsInit.getItemTranslator().translateToJava(action.getToItem());
                                     if (javaItem.getId() == 0) { //item missing mapping
                                         break;
                                     }
-                                    ClientCreativeInventoryActionPacket creativeDropPacket = new ClientCreativeInventoryActionPacket(-1, InventoryUtils.fixStack(javaItem));
+                                    ClientCreativeInventoryActionPacket creativeDropPacket = new ClientCreativeInventoryActionPacket(-1, fixStack(javaItem));
                                     session.getDownstream().getSession().send(creativeDropPacket);
                                 }
                                 break;
@@ -111,11 +122,10 @@ public class BedrockInventoryTransactionTranslator extends PacketTranslator<Inve
                 for (InventoryAction action : packet.getActions()) {
                     if (action.getSource().getType() == InventorySource.Type.WORLD_INTERACTION) {
                         worldAction = action;
-                    } else if (action.getSource().getContainerId() == ContainerId.CURSOR) {
+                    } else if (action.getSource().getContainerId() == ContainerId.CURSOR && action.getSlot() == 0) {
                         cursorAction = action;
                     }
                 }
-
                 List<InventoryAction> actions = packet.getActions();
                 if (inventory.getWindowType() == WindowType.ANVIL) {
                     InventoryAction anvilResult = null;
@@ -132,7 +142,8 @@ public class BedrockInventoryTransactionTranslator extends PacketTranslator<Inve
                         itemName = anvilResult.getFromItem();
                         actions = new ArrayList<>(2);
                         for (InventoryAction action : packet.getActions()) { //packet sent by client when grabbing anvil output needs useless actions stripped
-                            if (!(action.getSource().getContainerId() == ContainerId.CONTAINER_INPUT || action.getSource().getContainerId() == ContainerId.ANVIL_MATERIAL)) {
+                            if (!(action.getSource().getContainerId() == ContainerId.CONTAINER_INPUT ||
+                                    action.getSource().getContainerId() == ContainerId.ANVIL_MATERIAL)) {
                                 actions.add(action);
                             }
                         }
@@ -153,7 +164,7 @@ public class BedrockInventoryTransactionTranslator extends PacketTranslator<Inve
                 }
 
                 if (actions.size() == 2) {
-                    if (worldAction != null && worldAction.getSource().getFlag() == InventorySource.Flag.DROP_ITEM) {
+                    if (worldAction != null) {
                         //find container action
                         InventoryAction containerAction = null;
                         for (InventoryAction action : actions) {
@@ -162,30 +173,54 @@ public class BedrockInventoryTransactionTranslator extends PacketTranslator<Inve
                                 break;
                             }
                         }
-                        if (containerAction != null) {
+                        if (containerAction != null && worldAction.getSource().getFlag() == InventorySource.Flag.DROP_ITEM) {
                             //quick dropping from hotbar?
                             if (session.getInventoryCache().getOpenInventory() == null && containerAction.getSource().getContainerId() == ContainerId.INVENTORY) {
-                                if (containerAction.getSlot() == session.getInventory().getHeldItemSlot()) {
+                                int heldSlot = session.getInventory().getHeldItemSlot();
+                                if (containerAction.getSlot() == heldSlot) {
                                     ClientPlayerActionPacket actionPacket = new ClientPlayerActionPacket(
                                             containerAction.getToItem().getCount() == 0 ? PlayerAction.DROP_ITEM_STACK : PlayerAction.DROP_ITEM,
                                             new Position(0, 0, 0), BlockFace.DOWN);
                                     session.getDownstream().getSession().send(actionPacket);
+                                    ItemStack item = session.getInventory().getItem(heldSlot);
+                                    if (item != null) {
+                                        session.getInventory().setItem(heldSlot, new ItemStack(item.getId(), item.getAmount() - 1, item.getNbt()));
+                                    }
                                     return;
                                 }
                             }
-                            boolean leftClick = containerAction.getToItem().getCount() == 0;
+                            int dropAmount = containerAction.getFromItem().getCount() - containerAction.getToItem().getCount();
-                            if (containerAction.getSource().getContainerId() != ContainerId.CURSOR) { //dropping directly from inventory
+                            if (containerAction != cursorAction) { //dropping directly from inventory
                                 int javaSlot = translator.bedrockSlotToJava(containerAction);
-                                ClientWindowActionPacket dropPacket = new ClientWindowActionPacket(inventory.getId(), inventory.getTransactionId().getAndIncrement(),
+                                if (dropAmount == containerAction.getFromItem().getCount()) {
-                                        javaSlot, null, WindowAction.DROP_ITEM,
+                                    ClientWindowActionPacket dropPacket = new ClientWindowActionPacket(inventory.getId(),
-                                        leftClick ? DropItemParam.DROP_SELECTED_STACK : DropItemParam.DROP_FROM_SELECTED);
+                                            inventory.getTransactionId().getAndIncrement(),
-                                session.getDownstream().getSession().send(dropPacket);
+                                            javaSlot, null, WindowAction.DROP_ITEM,
+                                            DropItemParam.DROP_SELECTED_STACK);
+                                    session.getDownstream().getSession().send(dropPacket);
+                                } else {
+                                    for (int i = 0; i < dropAmount; i++) {
+                                        ClientWindowActionPacket dropPacket = new ClientWindowActionPacket(inventory.getId(),
+                                                inventory.getTransactionId().getAndIncrement(),
+                                                javaSlot, null, WindowAction.DROP_ITEM,
+                                                DropItemParam.DROP_FROM_SELECTED);
+                                        session.getDownstream().getSession().send(dropPacket);
+                                    }
+                                }
+                                ItemStack item = session.getInventory().getItem(javaSlot);
+                                if (item != null) {
+                                    session.getInventory().setItem(javaSlot, new ItemStack(item.getId(), item.getAmount() - dropAmount, item.getNbt()));
+                                }
                                 return;
                             } else { //clicking outside of inventory
                                 ClientWindowActionPacket dropPacket = new ClientWindowActionPacket(inventory.getId(), inventory.getTransactionId().getAndIncrement(),
                                         -999, null, WindowAction.CLICK_ITEM,
-                                        leftClick ? ClickItemParam.LEFT_CLICK : ClickItemParam.RIGHT_CLICK);
+                                        dropAmount > 1 ? ClickItemParam.LEFT_CLICK : ClickItemParam.RIGHT_CLICK);
                                 session.getDownstream().getSession().send(dropPacket);
+                                ItemStack cursor = session.getInventory().getCursor();
+                                if (cursor != null) {
+                                    session.getInventory().setCursor(new ItemStack(cursor.getId(), dropAmount > 1 ? 0 : cursor.getAmount() - 1, cursor.getNbt()));
+                                }
                                 return;
                             }
                         }
@@ -199,43 +234,81 @@ public class BedrockInventoryTransactionTranslator extends PacketTranslator<Inve
                             }
                         }
                         if (containerAction != null) {
-                            if (InventoryUtils.canCombine(cursorAction.getFromItem(), cursorAction.getToItem())
+                            //left/right click
-                                    && cursorAction.getToItem().getCount() > cursorAction.getFromItem().getCount()) { //fill stack
+                            List<ClickAction> plan = new ArrayList<>();
-                                int javaSlot = session.getLastClickedSlot();
+                            ItemStack translatedCursor = TranslatorsInit.getItemTranslator().translateToJava(cursorAction.getFromItem());
-                                ClientWindowActionPacket fillStackPacket = new ClientWindowActionPacket(inventory.getId(), inventory.getTransactionId().getAndIncrement(),
+                            boolean refresh = !Objects.equals(session.getInventory().getCursor(), translatedCursor.getId() == 0 ? null : translatedCursor); //refresh slot if there is a cursor mismatch
-                                        javaSlot, null, WindowAction.FILL_STACK, FillStackParam.FILL);
+                            int javaSlot = translator.bedrockSlotToJava(containerAction);
-                                session.getDownstream().getSession().send(fillStackPacket);
+                            if (cursorAction.getFromItem().equals(containerAction.getToItem()) &&
-                                translator.updateInventory(session, inventory); //bedrock fill stack can sometimes differ from java version, refresh and let server change slots
+                                    containerAction.getFromItem().equals(cursorAction.getToItem()) &&
-                                return;
+                                    !canStack(cursorAction.getFromItem(), containerAction.getFromItem())) { //simple swap
-                            } else {
+                                Click.LEFT.onSlot(javaSlot, plan);
-                                //left/right click
+                            } else if (cursorAction.getFromItem().getCount() > cursorAction.getToItem().getCount()) { //release
-                                int javaSlot = translator.bedrockSlotToJava(containerAction);
+                                if (cursorAction.getToItem().getCount() == 0) {
-                                boolean rightClick;
+                                    Click.LEFT.onSlot(javaSlot, plan);
-                                if (cursorAction.getFromItem().getCount() == 0) { //picking up item
+                                } else {
-                                    rightClick = containerAction.getToItem().getCount() != 0;
+                                    int difference = cursorAction.getFromItem().getCount() - cursorAction.getToItem().getCount();
-                                } else { //releasing item
+                                    for (int i = 0; i < difference; i++) {
-                                    rightClick = cursorAction.getToItem().getCount() != 0 && cursorAction.getFromItem().getCount() - cursorAction.getToItem().getCount() == 1;
+                                        Click.RIGHT.onSlot(javaSlot, plan);
+                                    }
+                                }
+                            } else { //pickup
+                                if (cursorAction.getFromItem().getCount() == 0) {
+                                    if (containerAction.getToItem().getCount() == 0) { //pickup all
+                                        Click.LEFT.onSlot(javaSlot, plan);
+                                    } else { //pickup some
+                                        if (translator.isOutputSlot(javaSlot) ||
+                                                containerAction.getToItem().getCount() == containerAction.getFromItem().getCount() / 2) { //right click
+                                            Click.RIGHT.onSlot(javaSlot, plan);
+                                        } else {
+                                            Click.LEFT.onSlot(javaSlot, plan);
+                                            int difference = containerAction.getFromItem().getCount() - cursorAction.getToItem().getCount();
+                                            for (int i = 0; i < difference; i++) {
+                                                Click.RIGHT.onSlot(javaSlot, plan);
+                                            }
+                                        }
+                                    }
+                                } else { //pickup into non-empty cursor
+                                    if (translator.isOutputSlot(javaSlot)) {
+                                        if (containerAction.getToItem().getCount() == 0) {
+                                            Click.LEFT.onSlot(javaSlot, plan);
+                                        } else {
+                                            ClientWindowActionPacket shiftClickPacket = new ClientWindowActionPacket(inventory.getId(),
+                                                    inventory.getTransactionId().getAndIncrement(),
+                                                    javaSlot, refreshItem, WindowAction.SHIFT_CLICK_ITEM,
+                                                    ShiftClickItemParam.LEFT_CLICK);
+                                            session.getDownstream().getSession().send(shiftClickPacket);
+                                            translator.updateInventory(session, inventory);
+                                            return;
+                                        }
+                                    } else if ((inventory.getId() == 0 || inventory.getWindowType() == WindowType.CRAFTING) && javaSlot == 0) { //crafting output
+                                        Click.LEFT.onSlot(javaSlot, plan);
+                                    } else {
+                                        int cursorSlot = findTempSlot(inventory, session.getInventory().getCursor(), Collections.singletonList(javaSlot));
+                                        if (cursorSlot != -1) {
+                                            Click.LEFT.onSlot(cursorSlot, plan);
+                                        } else {
+                                            translator.updateInventory(session, inventory);
+                                            return;
+                                        }
+                                        Click.LEFT.onSlot(javaSlot, plan);
+                                        int difference = cursorAction.getToItem().getCount() - cursorAction.getFromItem().getCount();
+                                        for (int i = 0; i < difference; i++) {
+                                            Click.RIGHT.onSlot(cursorSlot, plan);
+                                        }
+                                        Click.LEFT.onSlot(javaSlot, plan);
+                                        Click.LEFT.onSlot(cursorSlot, plan);
+                                    }
                                 }
-                                ItemStack translatedCursor = TranslatorsInit.getItemTranslator().translateToJava(cursorAction.getFromItem());
-                                boolean refresh = !Objects.equals(session.getInventory().getCursor(), translatedCursor.getId() == 0 ? null : translatedCursor); //refresh slot if there is a cursor mismatch
-                                ClientWindowActionPacket clickPacket = new ClientWindowActionPacket(inventory.getId(),
-                                        inventory.getTransactionId().getAndIncrement(), javaSlot,
-                                        refresh ? new ItemStack(1, 127, new CompoundTag("")) : InventoryUtils.fixStack(TranslatorsInit.getItemTranslator().translateToJava(containerAction.getFromItem())), //send invalid item stack to refresh slot
-                                        WindowAction.CLICK_ITEM, rightClick ? ClickItemParam.RIGHT_CLICK : ClickItemParam.LEFT_CLICK);
-                                session.getDownstream().getSession().send(clickPacket);
-                                inventory.getItems()[javaSlot] = TranslatorsInit.getItemTranslator().translateToJava(containerAction.getToItem());
-                                translator.updateSlot(session, inventory, javaSlot);
-                                session.getInventory().setCursor(TranslatorsInit.getItemTranslator().translateToJava(cursorAction.getToItem()));
-                                session.setLastClickedSlot(javaSlot);
-                                return;
                             }
+                            executePlan(session, inventory, translator, plan, refresh);
+                            return;
                         }
                     } else {
-                        //either moving 1 item or swapping 2 slots (touchscreen or one slot shift click)
+                        List<ClickAction> plan = new ArrayList<>();
                         InventoryAction fromAction;
                         InventoryAction toAction;
-                        //find source slot
+                        if (actions.get(0).getFromItem().getCount() >= actions.get(0).getToItem().getCount()) {
-                        if (actions.get(0).getFromItem().getCount() > actions.get(0).getToItem().getCount()) {
                             fromAction = actions.get(0);
                             toAction = actions.get(1);
                         } else {
@@ -245,120 +318,93 @@ public class BedrockInventoryTransactionTranslator extends PacketTranslator<Inve
                         int fromSlot = translator.bedrockSlotToJava(fromAction);
                         int toSlot = translator.bedrockSlotToJava(toAction);
 
-                        //check if dealing with output only slot like furnace. this is to handle a situation where the output slot was partially emptied without right clicking (touchscreen or full inventory)
+                        if ((inventory.getId() == 0 || inventory.getWindowType() == WindowType.CRAFTING) && fromSlot == 0) {
-                        //this is only possible by shift clicking
+                            if ((craftSlot != 0 && craftSlot != -2) && (inventory.getItem(toSlot) == null ||
-                        if (translator.isOutputSlot(fromAction) && fromAction.getToItem().getCount() != 0) {
+                                    canStack(session.getInventory().getCursor(), inventory.getItem(toSlot)))) {
-                            ClientWindowActionPacket shiftClickPacket = new ClientWindowActionPacket(inventory.getId(), inventory.getTransactionId().getAndIncrement(),
+                                boolean refresh = false;
-                                    fromSlot, InventoryUtils.fixStack(inventory.getItem(fromSlot)), WindowAction.SHIFT_CLICK_ITEM, ShiftClickItemParam.LEFT_CLICK);
+                                if (fromAction.getToItem().getCount() == 0) {
-                            session.getDownstream().getSession().send(shiftClickPacket);
+                                    refresh = true;
-                            inventory.getItems()[toSlot] = TranslatorsInit.getItemTranslator().translateToJava(toAction.getToItem());
+                                    Click.LEFT.onSlot(toSlot, plan);
-                            inventory.getItems()[fromSlot] = TranslatorsInit.getItemTranslator().translateToJava(fromAction.getToItem());
+                                    if (craftSlot != -1) {
-                            return;
+                                        Click.LEFT.onSlot(craftSlot, plan);
-                        } else {
-                            //pickup fromAction item
-                            ClientWindowActionPacket leftClick1Packet = new ClientWindowActionPacket(inventory.getId(), inventory.getTransactionId().getAndIncrement(),
-                                    fromSlot, InventoryUtils.fixStack(TranslatorsInit.getItemTranslator().translateToJava(fromAction.getFromItem())), WindowAction.CLICK_ITEM,
-                                    ClickItemParam.LEFT_CLICK);
-                            session.getDownstream().getSession().send(leftClick1Packet);
-                            //release fromAction item into toAction slot
-                            ClientWindowActionPacket leftClick2Packet = new ClientWindowActionPacket(inventory.getId(), inventory.getTransactionId().getAndIncrement(),
-                                    toSlot, InventoryUtils.fixStack(TranslatorsInit.getItemTranslator().translateToJava(toAction.getFromItem())), WindowAction.CLICK_ITEM,
-                                    ClickItemParam.LEFT_CLICK);
-                            session.getDownstream().getSession().send(leftClick2Packet);
-                            //test if swapping two items or moving one item
-                            //if swapping then complete it
-                            if (fromAction.getToItem().getId() != 0) {
-                                ClientWindowActionPacket leftClick3Packet = new ClientWindowActionPacket(inventory.getId(), inventory.getTransactionId().getAndIncrement(),
-                                        fromSlot, null, WindowAction.CLICK_ITEM,
-                                        ClickItemParam.LEFT_CLICK);
-                                session.getDownstream().getSession().send(leftClick3Packet);
-                            }
-                            inventory.getItems()[toSlot] = TranslatorsInit.getItemTranslator().translateToJava(toAction.getToItem());
-                            inventory.getItems()[fromSlot] = TranslatorsInit.getItemTranslator().translateToJava(fromAction.getToItem());
-                            return;
-                        }
-                    }
-                } else if (actions.size() > 2) {
-                    //shift click or fill stack?
-                    ItemData firstItem;
-                    if (actions.get(0).getFromItem().getId() != 0) {
-                        firstItem = actions.get(0).getFromItem();
-                    } else {
-                        firstItem = actions.get(0).getToItem();
-                    }
-                    List<InventoryAction> sourceActions = new ArrayList<>(actions.size());
-                    List<InventoryAction> destActions = new ArrayList<>(actions.size());
-                    boolean sameItems = true;
-                    for (InventoryAction action : actions) {
-                        if (action.getFromItem().getCount() > action.getToItem().getCount()) {
-                            if (!InventoryUtils.canCombine(action.getFromItem(), firstItem))
-                                sameItems = false;
-                            sourceActions.add(action);
-                        } else {
-                            if (!InventoryUtils.canCombine(action.getToItem(), firstItem))
-                                sameItems = false;
-                            destActions.add(action);
-                        }
-                    }
-                    if (sameItems) {
-                        if (sourceActions.size() == 1) { //shift click
-                            InventoryAction sourceAction = sourceActions.get(0);
-                            //in java edition, shift clicked item must move across hotbar and main inventory
-                            if (sourceAction.getSource().getContainerId() == ContainerId.INVENTORY) {
-                                for (InventoryAction action : actions) {
-                                    if (action != sourceAction && action.getSource().getContainerId() == ContainerId.INVENTORY) {
-                                        if ((sourceAction.getSlot() < 9 && action.getSlot() < 9) || (sourceAction.getSlot() >= 9 && action.getSlot() >= 9)) {
-                                            //shift click not compatible with java edition. refresh inventory and abort
-                                            translator.updateInventory(session, inventory);
-                                            return;
-                                        }
                                     }
+                                } else {
+                                    int difference = toAction.getToItem().getCount() - toAction.getFromItem().getCount();
+                                    for (int i = 0; i < difference; i++) {
+                                        Click.RIGHT.onSlot(toSlot, plan);
+                                    }
+                                    session.setCraftSlot(craftSlot);
                                 }
-                            }
+                                executePlan(session, inventory, translator, plan, refresh);
-                            int javaSlot = translator.bedrockSlotToJava(sourceAction);
+                                return;
-                            ClientWindowActionPacket shiftClickPacket = new ClientWindowActionPacket(inventory.getId(), inventory.getTransactionId().getAndIncrement(),
-                                    javaSlot, InventoryUtils.fixStack(inventory.getItem(javaSlot)), WindowAction.SHIFT_CLICK_ITEM, ShiftClickItemParam.LEFT_CLICK);
-                            session.getDownstream().getSession().send(shiftClickPacket);
-                            return;
-                        } else if (destActions.size() == 1) { //fill stack
-                            InventoryAction destAction = destActions.get(0);
-                            int javaSlot;
-                            if (destAction != cursorAction) { //if touchscreen
-                                javaSlot = translator.bedrockSlotToJava(destAction);
-                                ClientWindowActionPacket leftClickPacket = new ClientWindowActionPacket(inventory.getId(), inventory.getTransactionId().getAndIncrement(),
-                                        javaSlot, InventoryUtils.fixStack(inventory.getItem(javaSlot)), WindowAction.CLICK_ITEM, ClickItemParam.LEFT_CLICK);
-                                session.getDownstream().getSession().send(leftClickPacket);
                             } else {
-                                javaSlot = session.getLastClickedSlot();
+                                session.setCraftSlot(-2);
                             }
-                            ClientWindowActionPacket fillStackPacket = new ClientWindowActionPacket(inventory.getId(), inventory.getTransactionId().getAndIncrement(),
-                                    javaSlot, null, WindowAction.FILL_STACK, FillStackParam.FILL);
-                            session.getDownstream().getSession().send(fillStackPacket);
-                            if (destAction != cursorAction) { //if touchscreen
-                                ClientWindowActionPacket leftClickPacket = new ClientWindowActionPacket(inventory.getId(), inventory.getTransactionId().getAndIncrement(),
-                                        javaSlot, null, WindowAction.CLICK_ITEM, ClickItemParam.LEFT_CLICK);
-                                session.getDownstream().getSession().send(leftClickPacket);
-                                inventory.getItems()[javaSlot] = TranslatorsInit.getItemTranslator().translateToJava(destAction.getToItem());
-                            }
-                            translator.updateInventory(session, inventory);
-                            return;
                         }
+
+                        int cursorSlot = -1;
+                        if (session.getInventory().getCursor() != null) { //move cursor contents to a temporary slot
+                            cursorSlot = findTempSlot(inventory, session.getInventory().getCursor(), Arrays.asList(fromSlot, toSlot));
+                            if (cursorSlot != -1) {
+                                Click.LEFT.onSlot(cursorSlot, plan);
+                            } else {
+                                translator.updateInventory(session, inventory);
+                                return;
+                            }
+                        }
+                        if ((fromAction.getFromItem().equals(toAction.getToItem()) && !canStack(fromAction.getFromItem(), toAction.getFromItem())) || fromAction.getToItem().getId() == 0) { //slot swap
+                            Click.LEFT.onSlot(fromSlot, plan);
+                            Click.LEFT.onSlot(toSlot, plan);
+                            if (fromAction.getToItem().getId() != 0) {
+                                Click.LEFT.onSlot(fromSlot, plan);
+                            }
+                        } else if (canStack(fromAction.getFromItem(), toAction.getToItem())) { //partial item move
+                            if (translator.isOutputSlot(fromSlot)) {
+                                ClientWindowActionPacket shiftClickPacket = new ClientWindowActionPacket(inventory.getId(),
+                                        inventory.getTransactionId().getAndIncrement(),
+                                        fromSlot, refreshItem, WindowAction.SHIFT_CLICK_ITEM,
+                                        ShiftClickItemParam.LEFT_CLICK);
+                                session.getDownstream().getSession().send(shiftClickPacket);
+                                translator.updateInventory(session, inventory);
+                                return;
+                            } else if ((inventory.getId() == 0 || inventory.getWindowType() == WindowType.CRAFTING) && fromSlot == 0) {
+                                session.setCraftSlot(cursorSlot);
+                                Click.LEFT.onSlot(fromSlot, plan);
+                                int difference = toAction.getToItem().getCount() - toAction.getFromItem().getCount();
+                                for (int i = 0; i < difference; i++) {
+                                    Click.RIGHT.onSlot(toSlot, plan);
+                                }
+                                //client will send additional packets later to finish transferring crafting output
+                                //translator will know how to handle this using the craftSlot variable
+                            } else {
+                                Click.LEFT.onSlot(fromSlot, plan);
+                                int difference = toAction.getToItem().getCount() - toAction.getFromItem().getCount();
+                                for (int i = 0; i < difference; i++) {
+                                    Click.RIGHT.onSlot(toSlot, plan);
+                                }
+                                Click.LEFT.onSlot(fromSlot, plan);
+                            }
+                        }
+                        if (cursorSlot != -1) {
+                            Click.LEFT.onSlot(cursorSlot, plan);
+                        }
+                        executePlan(session, inventory, translator, plan, false);
+                        return;
                     }
                 }
-
-                //refresh inventory, transaction was not translated
                 translator.updateInventory(session, inventory);
                 break;
             case INVENTORY_MISMATCH:
                 InventorySlotPacket cursorPacket = new InventorySlotPacket();
                 cursorPacket.setContainerId(ContainerId.CURSOR);
                 cursorPacket.setSlot(TranslatorsInit.getItemTranslator().translateToBedrock(session.getInventory().getCursor()));
-                session.getUpstream().sendPacket(cursorPacket);
+                //session.getUpstream().sendPacket(cursorPacket);
 
                 Inventory inv = session.getInventoryCache().getOpenInventory();
                 if (inv == null)
                     inv = session.getInventory();
                 TranslatorsInit.getInventoryTranslators().get(inv.getWindowType()).updateInventory(session, inv);
+                break;
             case ITEM_USE:
                 if (packet.getActionType() == 1) {
                     ClientPlayerUseItemPacket useItemPacket = new ClientPlayerUseItemPacket(Hand.MAIN_HAND);
@@ -389,4 +435,134 @@ public class BedrockInventoryTransactionTranslator extends PacketTranslator<Inve
                 break;
         }
     }
+
+    private int findTempSlot(Inventory inventory, ItemStack item, List<Integer> slotBlacklist) {
+        /*try and find a slot that can temporarily store the given item
+        only look in the main inventory and hotbar
+        only slots that are empty or contain a different type of item are valid*/
+        int offset = inventory.getId() == 0 ? 1 : 0; //offhand is not a viable slot (some servers disable it)
+        List<ItemStack> itemBlacklist = new ArrayList<>(slotBlacklist.size() + 1);
+        itemBlacklist.add(item);
+        for (int slot : slotBlacklist) {
+            ItemStack blacklistItem = inventory.getItem(slot);
+            if (blacklistItem != null)
+                itemBlacklist.add(blacklistItem);
+        }
+        for (int i = inventory.getSize() - (36 + offset); i < inventory.getSize() - offset; i++) {
+            ItemStack testItem = inventory.getItem(i);
+            boolean acceptable = true;
+            if (testItem != null) {
+                for (ItemStack blacklistItem : itemBlacklist) {
+                    if (canStack(testItem, blacklistItem)) {
+                        acceptable = false;
+                        break;
+                    }
+                }
+            }
+            if (acceptable && !slotBlacklist.contains(i))
+                return i;
+        }
+        //could not find a viable temp slot
+        return -1;
+    }
+
+    //NPE if compound tag is null
+    private ItemStack fixStack(ItemStack stack) {
+        if (stack == null || stack.getId() == 0)
+            return null;
+        return new ItemStack(stack.getId(), stack.getAmount(), stack.getNbt() == null ? new CompoundTag("") : stack.getNbt());
+    }
+
+    private boolean canStack(ItemStack item1, ItemStack item2) {
+        if (item1 == null || item2 == null)
+            return false;
+        return item1.getId() == item2.getId() && item1.getNbt() == item2.getNbt();
+    }
+
+    private boolean canStack(ItemData item1, ItemData item2) {
+        if (item1 == null || item2 == null)
+            return false;
+        return item1.equals(item2, false, true, true);
+    }
+
+    private void executePlan(GeyserSession session, Inventory inventory, InventoryTranslator translator, List<ClickAction> plan, boolean refresh) {
+        PlayerInventory playerInventory = session.getInventory();
+        ListIterator<ClickAction> planIter = plan.listIterator();
+        while (planIter.hasNext()) {
+            ClickAction action = planIter.next();
+            ItemStack cursorItem = playerInventory.getCursor();
+            ItemStack clickedItem = inventory.getItem(action.slot);
+            short actionId = (short) inventory.getTransactionId().getAndIncrement();
+            boolean craftingOutput = (inventory.getId() == 0 || inventory.getWindowType() == WindowType.CRAFTING) && action.slot == 0;
+            if (craftingOutput)
+                refresh = true;
+            ClientWindowActionPacket clickPacket = new ClientWindowActionPacket(inventory.getId(),
+                    actionId, action.slot, !planIter.hasNext() && refresh ? refreshItem : fixStack(clickedItem),
+                    WindowAction.CLICK_ITEM, action.click.actionParam);
+            if (craftingOutput) { //crafting output
+                if (cursorItem == null && clickedItem != null) {
+                    playerInventory.setCursor(clickedItem);
+                } else if (canStack(cursorItem, clickedItem)) {
+                    playerInventory.setCursor(new ItemStack(cursorItem.getId(),
+                            cursorItem.getAmount() + clickedItem.getAmount(), cursorItem.getNbt()));
+                }
+            } else {
+                switch (action.click) {
+                    case LEFT:
+                        if (!canStack(cursorItem, clickedItem)) {
+                            playerInventory.setCursor(clickedItem);
+                            inventory.setItem(action.slot, cursorItem);
+                        } else {
+                            playerInventory.setCursor(null);
+                            inventory.setItem(action.slot, new ItemStack(clickedItem.getId(),
+                                    clickedItem.getAmount() + cursorItem.getAmount(), clickedItem.getNbt()));
+                        }
+                        break;
+                    case RIGHT:
+                        if (cursorItem == null && clickedItem != null) {
+                            ItemStack halfItem = new ItemStack(clickedItem.getId(),
+                                    clickedItem.getAmount() / 2, clickedItem.getNbt());
+                            inventory.setItem(action.slot, halfItem);
+                            playerInventory.setCursor(new ItemStack(clickedItem.getId(),
+                                    clickedItem.getAmount() - halfItem.getAmount(), clickedItem.getNbt()));
+                        } else if (cursorItem != null && clickedItem == null) {
+                            playerInventory.setCursor(new ItemStack(cursorItem.getId(),
+                                    cursorItem.getAmount() - 1, cursorItem.getNbt()));
+                            inventory.setItem(action.slot, new ItemStack(cursorItem.getId(),
+                                    1, cursorItem.getNbt()));
+                        } else if (canStack(cursorItem, clickedItem)) {
+                            playerInventory.setCursor(new ItemStack(cursorItem.getId(),
+                                    cursorItem.getAmount() - 1, cursorItem.getNbt()));
+                            inventory.setItem(action.slot, new ItemStack(clickedItem.getId(),
+                                    clickedItem.getAmount() + 1, clickedItem.getNbt()));
+                        }
+                        break;
+                }
+            }
+            session.getDownstream().getSession().send(clickPacket);
+            session.getDownstream().getSession().send(new ClientConfirmTransactionPacket(inventory.getId(), actionId, true));
+        }
+    }
+
+    private enum Click {
+        LEFT(ClickItemParam.LEFT_CLICK),
+        RIGHT(ClickItemParam.RIGHT_CLICK);
+
+        final WindowActionParam actionParam;
+        Click(WindowActionParam actionParam) {
+            this.actionParam = actionParam;
+        }
+        void onSlot(int slot, List<ClickAction> plan) {
+            plan.add(new ClickAction(slot, this));
+        }
+    }
+
+    private static class ClickAction {
+        final int slot;
+        final Click click;
+        ClickAction(int slot, Click click) {
+            this.slot = slot;
+            this.click = click;
+        }
+    }
 }

connector/src/main/java/org/geysermc/connector/network/translators/inventory/AnvilInventoryTranslator.java

@@ -54,7 +54,7 @@ public class AnvilInventoryTranslator extends BlockInventoryTranslator {
     }
 
     @Override
-    public boolean isOutputSlot(InventoryAction action) {
+    public boolean isOutputSlot(int slot) {
-        return action.getSource().getContainerId() == ContainerId.ANVIL_RESULT;
+        return slot == 2;
     }
 }

connector/src/main/java/org/geysermc/connector/network/translators/inventory/ContainerInventoryTranslator.java

@@ -43,7 +43,7 @@ public abstract class ContainerInventoryTranslator extends InventoryTranslator {
     public void updateInventory(GeyserSession session, Inventory inventory) {
         ItemData[] bedrockItems = new ItemData[this.size];
         for (int i = 0; i < bedrockItems.length; i++) {
-            bedrockItems[javaSlotToBedrock(i)] = TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItems()[i]);
+            bedrockItems[javaSlotToBedrock(i)] = TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItem(i));
         }
         InventoryContentPacket contentPacket = new InventoryContentPacket();
         contentPacket.setContainerId(inventory.getId());
@@ -52,7 +52,7 @@ public abstract class ContainerInventoryTranslator extends InventoryTranslator {
 
         Inventory playerInventory = session.getInventory();
         for (int i = 0; i < 36; i++) {
-            playerInventory.getItems()[i + 9] = inventory.getItems()[i + this.size];
+            playerInventory.setItem(i + 9, inventory.getItem(i + this.size));
         }
         TranslatorsInit.getInventoryTranslators().get(playerInventory.getWindowType()).updateInventory(session, playerInventory);
     }
@@ -61,13 +61,13 @@ public abstract class ContainerInventoryTranslator extends InventoryTranslator {
     public void updateSlot(GeyserSession session, Inventory inventory, int slot) {
         if (slot >= this.size) {
             Inventory playerInventory = session.getInventory();
-            playerInventory.getItems()[(slot + 9) - this.size] = inventory.getItem(slot);
+            playerInventory.setItem((slot + 9) - this.size, inventory.getItem(slot));
             TranslatorsInit.getInventoryTranslators().get(playerInventory.getWindowType()).updateSlot(session, playerInventory, (slot + 9) - this.size);
         } else {
             InventorySlotPacket slotPacket = new InventorySlotPacket();
             slotPacket.setContainerId(inventory.getId());
             slotPacket.setInventorySlot(javaSlotToBedrock(slot));
-            slotPacket.setSlot(TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItems()[slot]));
+            slotPacket.setSlot(TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItem(slot)));
             session.getUpstream().sendPacket(slotPacket);
         }
     }
@@ -97,7 +97,7 @@ public abstract class ContainerInventoryTranslator extends InventoryTranslator {
     }
 
     @Override
-    public boolean isOutputSlot(InventoryAction action) {
+    public boolean isOutputSlot(int slot) {
         return false;
     }
 }

connector/src/main/java/org/geysermc/connector/network/translators/inventory/CraftingTableInventoryTranslator.java

@@ -1,7 +1,9 @@
 package org.geysermc.connector.network.translators.inventory;
 
 import com.nukkitx.math.vector.Vector3i;
+import com.nukkitx.protocol.bedrock.data.ContainerId;
 import com.nukkitx.protocol.bedrock.data.ContainerType;
+import com.nukkitx.protocol.bedrock.data.InventoryAction;
 import com.nukkitx.protocol.bedrock.packet.ContainerOpenPacket;
 import org.geysermc.connector.inventory.Inventory;
 import org.geysermc.connector.network.session.GeyserSession;
@@ -30,4 +32,24 @@ public class CraftingTableInventoryTranslator extends ContainerInventoryTranslat
     public void closeInventory(GeyserSession session, Inventory inventory) {
 
     }
+
+    @Override
+    public int bedrockSlotToJava(InventoryAction action) {
+        int slotnum = action.getSlot();
+        if (action.getSource().getContainerId() == ContainerId.INVENTORY) {
+            //hotbar
+            if (slotnum >= 9) {
+                return slotnum + this.size - 9;
+            } else {
+                return slotnum + this.size + 27;
+            }
+        } else {
+            if (slotnum >= 32 && 42 >= slotnum) {
+                return slotnum - 31;
+            } else if (slotnum == 50) {
+                return 0;
+            }
+            return slotnum;
+        }
+    }
 }

connector/src/main/java/org/geysermc/connector/network/translators/inventory/DoubleChestInventoryTranslator.java

@@ -118,7 +118,7 @@ public class DoubleChestInventoryTranslator extends BlockInventoryTranslator {
         ItemData[] bedrockItems = new ItemData[54];
         for (int i = 0; i < bedrockItems.length; i++) {
             if (i <= this.size) {
-                bedrockItems[i] = TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItems()[i]);
+                bedrockItems[i] = TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItem(i));
             } else {
                 bedrockItems[i] = ItemData.AIR;
             }
@@ -130,7 +130,7 @@ public class DoubleChestInventoryTranslator extends BlockInventoryTranslator {
 
         Inventory playerInventory = session.getInventory();
         for (int i = 0; i < 36; i++) {
-            playerInventory.getItems()[i + 9] = inventory.getItems()[i + this.size];
+            playerInventory.setItem(i + 9, inventory.getItem(i + this.size));
         }
         TranslatorsInit.getInventoryTranslators().get(playerInventory.getWindowType()).updateInventory(session, playerInventory);
     }

connector/src/main/java/org/geysermc/connector/network/translators/inventory/FurnaceInventoryTranslator.java

@@ -59,7 +59,7 @@ public class FurnaceInventoryTranslator extends BlockInventoryTranslator {
     }
 
     @Override
-    public boolean isOutputSlot(InventoryAction action) {
+    public boolean isOutputSlot(int slot) {
-        return action.getSlot() == 2;
+        return slot == 2;
     }
 }

connector/src/main/java/org/geysermc/connector/network/translators/inventory/InventoryTranslator.java

@@ -44,5 +44,5 @@ public abstract class InventoryTranslator {
     public abstract void updateSlot(GeyserSession session, Inventory inventory, int slot);
     public abstract int bedrockSlotToJava(InventoryAction action);
     public abstract int javaSlotToBedrock(int slot);
-    public abstract boolean isOutputSlot(InventoryAction action);
+    public abstract boolean isOutputSlot(int slot);
 }

connector/src/main/java/org/geysermc/connector/network/translators/inventory/PlayerInventoryTranslator.java

@@ -45,12 +45,12 @@ public class PlayerInventoryTranslator extends InventoryTranslator {
         ItemData[] contents = new ItemData[36];
         // Inventory
         for (int i = 9; i < 36; i++) {
-            contents[i] = TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItems()[i]);
+            contents[i] = TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItem(i));
         }
 
         // Hotbar
         for (int i = 36; i < 45; i++) {
-            contents[i - 36] = TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItems()[i]);
+            contents[i - 36] = TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItem(i));
         }
 
         inventoryContentPacket.setContents(contents);
@@ -61,7 +61,7 @@ public class PlayerInventoryTranslator extends InventoryTranslator {
         armorContentPacket.setContainerId(ContainerId.ARMOR);
         contents = new ItemData[4];
         for (int i = 5; i < 9; i++) {
-            contents[i - 5] = TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItems()[i]);
+            contents[i - 5] = TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItem(i));
         }
         armorContentPacket.setContents(contents);
         session.getUpstream().sendPacket(armorContentPacket);
@@ -124,6 +124,12 @@ public class PlayerInventoryTranslator extends InventoryTranslator {
             case ContainerId.CRAFTING_ADD_INGREDIENT:
             case ContainerId.CRAFTING_REMOVE_INGREDIENT:
                 return slotnum + 1;
+            case ContainerId.CURSOR:
+                if (slotnum >= 28 && 31 >= slotnum) {
+                    return slotnum - 27;
+                } else if (slotnum == 50) {
+                    return 0;
+                }
         }
         return slotnum;
     }
@@ -134,7 +140,7 @@ public class PlayerInventoryTranslator extends InventoryTranslator {
     }
 
     @Override
-    public boolean isOutputSlot(InventoryAction action) {
+    public boolean isOutputSlot(int slot) {
         return false;
     }
 

connector/src/main/java/org/geysermc/connector/network/translators/inventory/SingleChestInventoryTranslator.java

@@ -43,7 +43,7 @@ public class SingleChestInventoryTranslator extends BlockInventoryTranslator {
         ItemData[] bedrockItems = new ItemData[27];
         for (int i = 0; i < bedrockItems.length; i++) {
             if (i <= this.size) {
-                bedrockItems[i] = TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItems()[i]);
+                bedrockItems[i] = TranslatorsInit.getItemTranslator().translateToBedrock(inventory.getItem(i));
             } else {
                 bedrockItems[i] = ItemData.AIR;
             }
@@ -55,7 +55,7 @@ public class SingleChestInventoryTranslator extends BlockInventoryTranslator {
 
         Inventory playerInventory = session.getInventory();
         for (int i = 0; i < 36; i++) {
-            playerInventory.getItems()[i + 9] = inventory.getItems()[i + this.size];
+            playerInventory.setItem(i + 9, inventory.getItem(i + this.size));
         }
         TranslatorsInit.getInventoryTranslators().get(playerInventory.getWindowType()).updateInventory(session, playerInventory);
     }

connector/src/main/java/org/geysermc/connector/network/translators/java/JavaDeclareRecipesTranslator.java

@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2019 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Geyser
+ */
+
+package org.geysermc.connector.network.translators.java;
+
+import com.github.steveice10.mc.protocol.data.game.recipe.Ingredient;
+import com.github.steveice10.mc.protocol.data.game.recipe.Recipe;
+import com.github.steveice10.mc.protocol.data.game.recipe.data.ShapedRecipeData;
+import com.github.steveice10.mc.protocol.data.game.recipe.data.ShapelessRecipeData;
+import com.github.steveice10.mc.protocol.packet.ingame.server.ServerDeclareRecipesPacket;
+import com.nukkitx.nbt.tag.CompoundTag;
+import com.nukkitx.protocol.bedrock.data.CraftingData;
+import com.nukkitx.protocol.bedrock.data.ItemData;
+import com.nukkitx.protocol.bedrock.packet.CraftingDataPacket;
+import lombok.AllArgsConstructor;
+import lombok.EqualsAndHashCode;
+import org.geysermc.connector.network.session.GeyserSession;
+import org.geysermc.connector.network.translators.PacketTranslator;
+import org.geysermc.connector.network.translators.TranslatorsInit;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+public class JavaDeclareRecipesTranslator extends PacketTranslator<ServerDeclareRecipesPacket> {
+
+    @Override
+    public void translate(ServerDeclareRecipesPacket packet, GeyserSession session) {
+        CraftingDataPacket craftingDataPacket = new CraftingDataPacket();
+        craftingDataPacket.setCleanRecipes(true);
+        for (Recipe recipe : packet.getRecipes()) {
+            switch (recipe.getType()) {
+                case CRAFTING_SHAPELESS: {
+                    ShapelessRecipeData shapelessRecipeData = (ShapelessRecipeData) recipe.getData();
+                    ItemData output = TranslatorsInit.getItemTranslator().translateToBedrock(shapelessRecipeData.getResult());
+                    List<ItemData[]> inputList = combinations(shapelessRecipeData.getIngredients());
+                    for (ItemData[] inputs : inputList) {
+                        UUID uuid = UUID.randomUUID();
+                        craftingDataPacket.getCraftingData().add(CraftingData.fromShapeless(uuid.toString(),
+                                inputs, new ItemData[]{output}, uuid, "crafting_table", 0));
+                    }
+                    break;
+                }
+                case CRAFTING_SHAPED: {
+                    ShapedRecipeData shapedRecipeData = (ShapedRecipeData) recipe.getData();
+                    ItemData output = TranslatorsInit.getItemTranslator().translateToBedrock(shapedRecipeData.getResult());
+                    List<ItemData[]> inputList = combinations(shapedRecipeData.getIngredients());
+                    for (ItemData[] inputs : inputList) {
+                        UUID uuid = UUID.randomUUID();
+                        craftingDataPacket.getCraftingData().add(CraftingData.fromShaped(uuid.toString(),
+                                shapedRecipeData.getWidth(), shapedRecipeData.getHeight(), inputs,
+                                new ItemData[]{output}, uuid, "crafting_table", 0));
+                    }
+                    break;
+                }
+            }
+        }
+        session.getUpstream().sendPacket(craftingDataPacket);
+    }
+
+    private List<ItemData[]> combinations(Ingredient[] ingredients) {
+        ItemData[][] squashed = new ItemData[ingredients.length][];
+        for (int i = 0; i < ingredients.length; i++) {
+            if (ingredients[i].getOptions().length == 0) {
+                squashed[i] = new ItemData[]{ItemData.AIR};
+                continue;
+            }
+            Ingredient ingredient = ingredients[i];
+            Map<GroupedItem, List<ItemData>> groupedByIds = Arrays.stream(ingredient.getOptions())
+                    .map(item -> TranslatorsInit.getItemTranslator().translateToBedrock(item))
+                    .collect(Collectors.groupingBy(item -> new GroupedItem(item.getId(), item.getCount(), item.getTag())));
+            squashed[i] = new ItemData[groupedByIds.size()];
+            int index = 0;
+            for (Map.Entry<GroupedItem, List<ItemData>> entry : groupedByIds.entrySet()) {
+                if (entry.getValue().size() > 1) {
+                    GroupedItem groupedItem = entry.getKey();
+                    squashed[i][index++] = ItemData.of(groupedItem.id, (short) -1, groupedItem.count, groupedItem.tag);
+                } else {
+                    ItemData item = entry.getValue().get(0);
+                    squashed[i][index++] = item;
+                }
+            }
+        }
+        int[] sizeArray = new int[squashed.length];
+        int[] counterArray = new int[squashed.length];
+        int totalCombinationCount = 1;
+        for(int i = 0; i < squashed.length; i++) {
+            sizeArray[i] = squashed[i].length;
+            totalCombinationCount *= squashed[i].length;
+        }
+        if (totalCombinationCount > 10000) {
+            ItemData[] translatedItems = new ItemData[ingredients.length];
+            for (int i = 0; i < ingredients.length; i++) {
+                if (ingredients[i].getOptions().length > 0) {
+                    translatedItems[i] = TranslatorsInit.getItemTranslator().translateToBedrock(ingredients[i].getOptions()[0]);
+                } else {
+                    translatedItems[i] = ItemData.AIR;
+                }
+            }
+            return Collections.singletonList(translatedItems);
+        }
+        List<ItemData[]> combinationList = new ArrayList<>(totalCombinationCount);
+        for (int countdown = totalCombinationCount; countdown > 0; --countdown) {
+            ItemData[] translatedItems = new ItemData[squashed.length];
+            for(int i = 0; i < squashed.length; ++i) {
+                if (squashed[i].length > 0)
+                    translatedItems[i] = squashed[i][counterArray[i]];
+            }
+            combinationList.add(translatedItems);
+            for(int incIndex = squashed.length - 1; incIndex >= 0; --incIndex) {
+                if(counterArray[incIndex] + 1 < sizeArray[incIndex]) {
+                    ++counterArray[incIndex];
+                    break;
+                }
+                counterArray[incIndex] = 0;
+            }
+        }
+        return combinationList;
+    }
+
+    @EqualsAndHashCode
+    @AllArgsConstructor
+    private static class GroupedItem {
+        int id;
+        int count;
+        CompoundTag tag;
+    }
+}

connector/src/main/java/org/geysermc/connector/network/translators/java/window/JavaSetSlotTranslator.java

@@ -47,9 +47,12 @@ public class JavaSetSlotTranslator extends PacketTranslator<ServerSetSlotPacket>
         if (packet.getWindowId() == 255 && packet.getSlot() == -1) { //cursor
             if (Objects.equals(session.getInventory().getCursor(), packet.getItem()))
                 return;
+            if (session.getCraftSlot() != 0)
+                return;
 
             //bedrock client is bugged when changing the cursor. reopen inventory after changing it
-            if (packet.getItem() == null && session.getInventory().getCursor() != null) {
+            //TODO: fix this. too buggy rn
+            /*if (packet.getItem() == null && session.getInventory().getCursor() != null) {
                 InventorySlotPacket cursorPacket = new InventorySlotPacket();
                 cursorPacket.setContainerId(ContainerId.CURSOR);
                 cursorPacket.setSlot(ItemData.AIR);
@@ -64,7 +67,7 @@ public class JavaSetSlotTranslator extends PacketTranslator<ServerSetSlotPacket>
                 ContainerClosePacket closePacket = new ContainerClosePacket();
                 closePacket.setWindowId((byte) inventory.getId());
                 Geyser.getGeneralThreadPool().schedule(() -> session.getUpstream().sendPacket(closePacket), 150, TimeUnit.MILLISECONDS);
-            }
+            }*/
 
             session.getInventory().setCursor(packet.getItem());
             return;
@@ -76,7 +79,7 @@ public class JavaSetSlotTranslator extends PacketTranslator<ServerSetSlotPacket>
 
         InventoryTranslator translator = TranslatorsInit.getInventoryTranslators().get(inventory.getWindowType());
         if (translator != null) {
-            inventory.getItems()[packet.getSlot()] = packet.getItem();
+            inventory.setItem(packet.getSlot(), packet.getItem());
             translator.updateSlot(session, inventory, packet.getSlot());
         }
     }

connector/src/main/java/org/geysermc/connector/utils/InventoryUtils.java

@@ -44,14 +44,13 @@ public class InventoryUtils {
                 session.getInventoryCache().uncacheInventory(windowId);
                 session.getInventoryCache().setOpenInventory(null);
             }
+        } else {
+            Inventory inventory = session.getInventory();
+            InventoryTranslator translator = TranslatorsInit.getInventoryTranslators().get(inventory.getWindowType());
+            translator.updateInventory(session, inventory);
         }
-    }
+        session.setCraftSlot(0);
-
+        session.getInventory().setCursor(null);
-    //currently, ItemStack.equals() does not check the item id
-    public static boolean canCombine(ItemData stack1, ItemData stack2) {
-        if (stack1 == null || stack2 == null)
-            return false;
-        return stack1.getId() == stack2.getId() && stack1.equals(stack2, false, true, true);
     }
 
     //NPE if nbt tag is null