RelicCraft/src/main/java/com/thebrokenrail/reliccraft/item/DragonEggHolderBlockItem.java

package com.thebrokenrail.reliccraft.item;

import com.thebrokenrail.reliccraft.RelicCraft;
import com.thebrokenrail.reliccraft.mixin.ModelPredicateProviderRegistryHook;
import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;
import net.minecraft.block.Block;
import net.minecraft.inventory.Inventories;
import net.minecraft.item.BlockItem;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.CompoundTag;
import net.minecraft.util.Identifier;
import net.minecraft.util.Rarity;
import net.minecraft.util.collection.DefaultedList;

import java.util.ArrayList;
import java.util.List;

public class DragonEggHolderBlockItem extends BlockItem {
    private static final List<DragonEggHolderBlockItem> list = new ArrayList<>();

    public DragonEggHolderBlockItem(Block block) {
        super(block, new Settings().rarity(Rarity.UNCOMMON).group(RelicCraft.ITEM_GROUP));
        list.add(this);
    }

    @Environment(EnvType.CLIENT)
    public static void initClient() {
        for (DragonEggHolderBlockItem item : list) {
            ModelPredicateProviderRegistryHook.callRegister(item, new Identifier(RelicCraft.NAMESPACE, "active"), (stack, world, entity) -> {
                CompoundTag tag = stack.getSubTag("BlockEntityTag");
                if (tag != null) {
                    DefaultedList<ItemStack> list = DefaultedList.ofSize(1, ItemStack.EMPTY);
                    Inventories.fromTag(tag, list);
                    if (!list.get(0).isEmpty()) {
                        return 1;
                    }
                }
                return 0;
            });
        }
    }
}