minecraft-kajetans-core-mod/src/main/java/me/kcm/Hooks.java

package me.kcm;

import java.util.Collections;
import java.util.List;
import javax.annotation.Nullable;
import net.minecraft.block.BlockState;
import net.minecraft.entity.Entity;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.inventory.CraftResultInventory;
import net.minecraft.inventory.CraftingInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.server.dedicated.DedicatedPlayerList;
import net.minecraft.server.dedicated.DedicatedServer;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.registry.DynamicRegistries;
import net.minecraft.world.World;
import net.minecraft.world.server.ServerWorld;
import net.minecraft.world.storage.PlayerData;
import net.minecraft.inventory.container.ClickType;
import net.minecraft.inventory.container.Container;

public class Hooks {
    @FunctionalInterface
    public interface PlayerListFunction {
        public void accept(DedicatedServer server, DynamicRegistries.Impl impl, PlayerData pd);
    }

    private static PlayerListFunction playerListFunction = null;
    private static BlockHarvest blockHarvest =
            (state, w, pos, tileEnt, ent, stack) -> Collections.EMPTY_LIST;
    private static Craft craft = (id, w, p, cInv, slot) -> {
    };
    private static ContainerClick click = (c, slot, dragType, ct, p) -> {
        return false;
    };

    public static void setPlayerListFunction(PlayerListFunction c) {
        playerListFunction = c;
    }

    public static void setPlayerList(DedicatedServer server, DynamicRegistries.Impl impl,
            PlayerData pd) {
        System.out.println("trying to update player list ...");
        if(playerListFunction != null) {
            playerListFunction.accept(server, impl, pd);
            System.out.println("succeeded with custom function");
        } else {
            try {
                server.setPlayerList(new DedicatedPlayerList(server, impl, pd));
                System.out.println("succeeded with vanilla function");
            } catch(Exception ex) {
                // this is stupid and should not be needed
                ex.printStackTrace();
            }
        }
    }

    public static void setBlockHarvest(BlockHarvest c) {
        blockHarvest = c;
    }

    public static void setCraft(Craft c) {
        craft = c;
    }

    public static void setContainerClick(ContainerClick c) {
        click = c;
    }

    public static List<ItemStack> getDropsA(BlockState state, ServerWorld w, BlockPos pos,
            @Nullable TileEntity tileEnt) {
        return blockHarvest.onBlockHarvest(state, w, pos, tileEnt, null, null);
    }

    public static List<ItemStack> getDropsB(BlockState state, ServerWorld w, BlockPos pos,
            @Nullable TileEntity tileEnt, @Nullable Entity ent, ItemStack stack) {
        return blockHarvest.onBlockHarvest(state, w, pos, tileEnt, ent, stack);
    }

    public static void onCraft(int id, World w, PlayerEntity p, CraftingInventory cInv,
            CraftResultInventory slot) {
        craft.onCraft(id, w, p, cInv, slot);
    }

    public static boolean onSlotClick(Container c, int slot, int dragType, ClickType ct,
            PlayerEntity p) {
        return click.onClick(c, slot, dragType, ct, p);
    }
}