minecraft-src/net/minecraft/world/level/block/entity/BrewingStandBlockEntity.java

package net.minecraft.world.level.block.entity;

import java.util.Arrays;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.core.NonNullList;
import net.minecraft.core.HolderLookup.Provider;
import net.minecraft.nbt.CompoundTag;
import net.minecraft.network.chat.Component;
import net.minecraft.tags.ItemTags;
import net.minecraft.world.ContainerHelper;
import net.minecraft.world.Containers;
import net.minecraft.world.WorldlyContainer;
import net.minecraft.world.entity.player.Inventory;
import net.minecraft.world.inventory.AbstractContainerMenu;
import net.minecraft.world.inventory.BrewingStandMenu;
import net.minecraft.world.inventory.ContainerData;
import net.minecraft.world.item.Item;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.item.Items;
import net.minecraft.world.item.alchemy.PotionBrewing;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.block.BrewingStandBlock;
import net.minecraft.world.level.block.state.BlockState;
import org.jetbrains.annotations.Nullable;

public class BrewingStandBlockEntity extends BaseContainerBlockEntity implements WorldlyContainer {
	private static final int INGREDIENT_SLOT = 3;
	private static final int FUEL_SLOT = 4;
	private static final int[] SLOTS_FOR_UP = new int[]{3};
	private static final int[] SLOTS_FOR_DOWN = new int[]{0, 1, 2, 3};
	private static final int[] SLOTS_FOR_SIDES = new int[]{0, 1, 2, 4};
	public static final int FUEL_USES = 20;
	public static final int DATA_BREW_TIME = 0;
	public static final int DATA_FUEL_USES = 1;
	public static final int NUM_DATA_VALUES = 2;
	/**
	 * The items currently placed in the slots of the brewing stand.
	 */
	private NonNullList<ItemStack> items = NonNullList.withSize(5, ItemStack.EMPTY);
	int brewTime;
	private boolean[] lastPotionCount;
	private Item ingredient;
	int fuel;
	protected final ContainerData dataAccess = new ContainerData() {
		@Override
		public int get(int index) {
			return switch (index) {
				case 0 -> BrewingStandBlockEntity.this.brewTime;
				case 1 -> BrewingStandBlockEntity.this.fuel;
				default -> 0;
			};
		}

		@Override
		public void set(int index, int value) {
			switch (index) {
				case 0:
					BrewingStandBlockEntity.this.brewTime = value;
					break;
				case 1:
					BrewingStandBlockEntity.this.fuel = value;
			}
		}

		@Override
		public int getCount() {
			return 2;
		}
	};

	public BrewingStandBlockEntity(BlockPos pos, BlockState state) {
		super(BlockEntityType.BREWING_STAND, pos, state);
	}

	@Override
	protected Component getDefaultName() {
		return Component.translatable("container.brewing");
	}

	@Override
	public int getContainerSize() {
		return this.items.size();
	}

	@Override
	protected NonNullList<ItemStack> getItems() {
		return this.items;
	}

	@Override
	protected void setItems(NonNullList<ItemStack> items) {
		this.items = items;
	}

	public static void serverTick(Level level, BlockPos pos, BlockState state, BrewingStandBlockEntity blockEntity) {
		ItemStack itemStack = blockEntity.items.get(4);
		if (blockEntity.fuel <= 0 && itemStack.is(ItemTags.BREWING_FUEL)) {
			blockEntity.fuel = 20;
			itemStack.shrink(1);
			setChanged(level, pos, state);
		}

		boolean bl = isBrewable(level.potionBrewing(), blockEntity.items);
		boolean bl2 = blockEntity.brewTime > 0;
		ItemStack itemStack2 = blockEntity.items.get(3);
		if (bl2) {
			blockEntity.brewTime--;
			boolean bl3 = blockEntity.brewTime == 0;
			if (bl3 && bl) {
				doBrew(level, pos, blockEntity.items);
			} else if (!bl || !itemStack2.is(blockEntity.ingredient)) {
				blockEntity.brewTime = 0;
			}

			setChanged(level, pos, state);
		} else if (bl && blockEntity.fuel > 0) {
			blockEntity.fuel--;
			blockEntity.brewTime = 400;
			blockEntity.ingredient = itemStack2.getItem();
			setChanged(level, pos, state);
		}

		boolean[] bls = blockEntity.getPotionBits();
		if (!Arrays.equals(bls, blockEntity.lastPotionCount)) {
			blockEntity.lastPotionCount = bls;
			BlockState blockState = state;
			if (!(state.getBlock() instanceof BrewingStandBlock)) {
				return;
			}

			for (int i = 0; i < BrewingStandBlock.HAS_BOTTLE.length; i++) {
				blockState = blockState.setValue(BrewingStandBlock.HAS_BOTTLE[i], bls[i]);
			}

			level.setBlock(pos, blockState, 2);
		}
	}

	/**
	 * @return an array of size 3 where every element represents whether the respective slot is not empty
	 */
	private boolean[] getPotionBits() {
		boolean[] bls = new boolean[3];

		for (int i = 0; i < 3; i++) {
			if (!this.items.get(i).isEmpty()) {
				bls[i] = true;
			}
		}

		return bls;
	}

	private static boolean isBrewable(PotionBrewing potionBrewing, NonNullList<ItemStack> items) {
		ItemStack itemStack = items.get(3);
		if (itemStack.isEmpty()) {
			return false;
		} else if (!potionBrewing.isIngredient(itemStack)) {
			return false;
		} else {
			for (int i = 0; i < 3; i++) {
				ItemStack itemStack2 = items.get(i);
				if (!itemStack2.isEmpty() && potionBrewing.hasMix(itemStack2, itemStack)) {
					return true;
				}
			}

			return false;
		}
	}

	private static void doBrew(Level level, BlockPos pos, NonNullList<ItemStack> items) {
		ItemStack itemStack = items.get(3);
		PotionBrewing potionBrewing = level.potionBrewing();

		for (int i = 0; i < 3; i++) {
			items.set(i, potionBrewing.mix(itemStack, items.get(i)));
		}

		itemStack.shrink(1);
		ItemStack itemStack2 = itemStack.getItem().getCraftingRemainder();
		if (!itemStack2.isEmpty()) {
			if (itemStack.isEmpty()) {
				itemStack = itemStack2;
			} else {
				Containers.dropItemStack(level, pos.getX(), pos.getY(), pos.getZ(), itemStack2);
			}
		}

		items.set(3, itemStack);
		level.levelEvent(1035, pos, 0);
	}

	@Override
	protected void loadAdditional(CompoundTag tag, Provider registries) {
		super.loadAdditional(tag, registries);
		this.items = NonNullList.withSize(this.getContainerSize(), ItemStack.EMPTY);
		ContainerHelper.loadAllItems(tag, this.items, registries);
		this.brewTime = tag.getShort("BrewTime");
		if (this.brewTime > 0) {
			this.ingredient = this.items.get(3).getItem();
		}

		this.fuel = tag.getByte("Fuel");
	}

	@Override
	protected void saveAdditional(CompoundTag tag, Provider registries) {
		super.saveAdditional(tag, registries);
		tag.putShort("BrewTime", (short)this.brewTime);
		ContainerHelper.saveAllItems(tag, this.items, registries);
		tag.putByte("Fuel", (byte)this.fuel);
	}

	@Override
	public boolean canPlaceItem(int slot, ItemStack stack) {
		if (slot == 3) {
			PotionBrewing potionBrewing = this.level != null ? this.level.potionBrewing() : PotionBrewing.EMPTY;
			return potionBrewing.isIngredient(stack);
		} else {
			return slot == 4
				? stack.is(ItemTags.BREWING_FUEL)
				: (stack.is(Items.POTION) || stack.is(Items.SPLASH_POTION) || stack.is(Items.LINGERING_POTION) || stack.is(Items.GLASS_BOTTLE))
					&& this.getItem(slot).isEmpty();
		}
	}

	@Override
	public int[] getSlotsForFace(Direction side) {
		if (side == Direction.UP) {
			return SLOTS_FOR_UP;
		} else {
			return side == Direction.DOWN ? SLOTS_FOR_DOWN : SLOTS_FOR_SIDES;
		}
	}

	@Override
	public boolean canPlaceItemThroughFace(int index, ItemStack itemStack, @Nullable Direction direction) {
		return this.canPlaceItem(index, itemStack);
	}

	@Override
	public boolean canTakeItemThroughFace(int index, ItemStack stack, Direction direction) {
		return index == 3 ? stack.is(Items.GLASS_BOTTLE) : true;
	}

	@Override
	protected AbstractContainerMenu createMenu(int containerId, Inventory inventory) {
		return new BrewingStandMenu(containerId, inventory, this, this.dataAccess);
	}
}