Add Support of Item Combine (#513)

* Add Support of Item Combine

* Add Support of Item Combine

Co-authored-by: Melledy <52122272+Melledy@users.noreply.github.com>

src/main/java/emu/grasscutter/game/combine/CombineManger.java

@@ -0,0 +1,83 @@
+package emu.grasscutter.game.combine;
+
+import emu.grasscutter.data.GameData;
+import emu.grasscutter.data.def.CombineData;
+import emu.grasscutter.game.inventory.ItemType;
+import emu.grasscutter.game.player.Player;
+import emu.grasscutter.net.proto.RetcodeOuterClass;
+import emu.grasscutter.server.game.GameServer;
+import emu.grasscutter.server.packet.send.PacketCombineRsp;
+import it.unimi.dsi.fastutil.Pair;
+
+import java.util.List;
+
+public class CombineManger {
+    private final GameServer gameServer;
+
+    public GameServer getGameServer() {
+        return gameServer;
+    }
+
+    public CombineManger(GameServer gameServer) {
+        this.gameServer = gameServer;
+    }
+
+    public CombineResult combineItem(Player player, int cid, int count){
+        // check config exist
+        if(!GameData.getCombineDataMap().containsKey(cid)){
+            player.getWorld().getHost().sendPacket(new PacketCombineRsp());
+            return null;
+        }
+
+        CombineData combineData = GameData.getCombineDataMap().get(cid);
+
+        if(combineData.getPlayerLevel() > player.getLevel()){
+            return null;
+        }
+        // check enough
+        var enough = combineData.getMaterialItems().stream()
+                .filter(item -> player.getInventory()
+                        .getInventoryTab(ItemType.ITEM_MATERIAL)
+                        .getItemById(item.getId())
+                        .getCount() < item.getCount() * count
+                )
+                .findAny()
+                .isEmpty();
+
+        // if not enough
+        if(!enough){
+            player.getWorld().getHost().sendPacket(
+                    new PacketCombineRsp(RetcodeOuterClass.Retcode.RET_ITEM_COMBINE_COUNT_NOT_ENOUGH_VALUE)
+            );
+            return null;
+        }
+        if (player.getMora() >= combineData.getScoinCost()) {
+            player.setMora(player.getMora() - combineData.getScoinCost() * count);
+        } else {
+            return null;
+        }
+        // try to remove materials
+        combineData.getMaterialItems().stream()
+                .map(item -> Pair.of(player.getInventory()
+                                .getInventoryTab(ItemType.ITEM_MATERIAL)
+                                .getItemById(item.getId())
+                        ,item.getCount() * count)
+                )
+                .forEach(item -> player.getInventory().removeItem(item.first(), item.second()));
+
+        // make the result
+        player.getInventory().addItem(combineData.getResultItemId(),
+                combineData.getResultItemCount() * count);
+
+        CombineResult result = new CombineResult();
+        result.setMaterial(List.of());
+        result.setResult(List.of(new CombineData.CombineItemPair(combineData.getResultItemId(),
+                combineData.getResultItemCount() * count)));
+        // TODO lucky characters
+        result.setExtra(List.of());
+        result.setBack(List.of());
+
+        return result;
+    }
+
+}

src/main/java/emu/grasscutter/game/combine/CombineResult.java

@@ -0,0 +1,45 @@
+package emu.grasscutter.game.combine;
+
+import emu.grasscutter.data.def.CombineData;
+
+import java.util.List;
+
+public class CombineResult {
+    private List<CombineData.CombineItemPair> material;
+    private List<CombineData.CombineItemPair> result;
+    private List<CombineData.CombineItemPair> extra;
+    private List<CombineData.CombineItemPair> back;
+
+    public List<CombineData.CombineItemPair> getMaterial() {
+        return material;
+    }
+
+    public void setMaterial(List<CombineData.CombineItemPair> material) {
+        this.material = material;
+    }
+
+    public List<CombineData.CombineItemPair> getResult() {
+        return result;
+    }
+
+    public void setResult(List<CombineData.CombineItemPair> result) {
+        this.result = result;
+    }
+
+    public List<CombineData.CombineItemPair> getExtra() {
+        return extra;
+    }
+
+    public void setExtra(List<CombineData.CombineItemPair> extra) {
+        this.extra = extra;
+    }
+
+    public List<CombineData.CombineItemPair> getBack() {
+        return back;
+    }
+
+    public void setBack(List<CombineData.CombineItemPair> back) {
+        this.back = back;
+    }
+
+}