Clean up build item collection logic (#50)

src/main/java/fr/hugman/build_rush/build/BuildItemCollector.java

@@ -0,0 +1,271 @@
+package fr.hugman.build_rush.build;
+
+import fr.hugman.build_rush.BuildRush;
+import fr.hugman.build_rush.mixin.CandleCakeBlockAccessor;
+import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.Blocks;
+import net.minecraft.block.BrewingStandBlock;
+import net.minecraft.block.CampfireBlock;
+import net.minecraft.block.CandleBlock;
+import net.minecraft.block.CandleCakeBlock;
+import net.minecraft.block.ChiseledBookshelfBlock;
+import net.minecraft.block.EndPortalFrameBlock;
+import net.minecraft.block.FlowerPotBlock;
+import net.minecraft.block.LecternBlock;
+import net.minecraft.block.LeveledCauldronBlock;
+import net.minecraft.block.MultifaceGrowthBlock;
+import net.minecraft.block.RespawnAnchorBlock;
+import net.minecraft.block.SlabBlock;
+import net.minecraft.block.VineBlock;
+import net.minecraft.block.entity.BlockEntity;
+import net.minecraft.block.enums.BedPart;
+import net.minecraft.block.enums.DoubleBlockHalf;
+import net.minecraft.block.enums.SlabType;
+import net.minecraft.fluid.Fluids;
+import net.minecraft.item.BlockItem;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemConvertible;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
+import net.minecraft.item.PlayerHeadItem;
+import net.minecraft.nbt.NbtCompound;
+import net.minecraft.potion.PotionUtil;
+import net.minecraft.potion.Potions;
+import net.minecraft.registry.tag.BlockTags;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.state.property.IntProperty;
+import net.minecraft.state.property.Properties;
+import net.minecraft.state.property.Property;
+import net.minecraft.util.math.BlockPos;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Consumer;
+
+public class BuildItemCollector {
+	private static final Comparator<ItemStack> COMPARATOR = Comparator.comparingInt(ItemStack::getCount).reversed();
+
+	private final List<ItemStack> additionalStacks = new ArrayList<>();
+	private final Object2IntOpenHashMap<Item> counts = new Object2IntOpenHashMap<>();
+	private final Map<Item, ItemStack> singletonStacks = new HashMap<>();
+
+	private void add(ItemStack stack) {
+		if (!stack.isEmpty()) {
+			if (stack.hasNbt()) {
+				this.additionalStacks.add(stack);
+			} else {
+				this.addCount(stack.getItem(), stack.getCount());
+			}
+		}
+	}
+
+	private void addCount(ItemConvertible item, int count) {
+		this.counts.addTo(item.asItem(), count);
+	}
+
+	private void addSingletonStack(Item item, Consumer<ItemStack> creator) {
+		this.singletonStacks.computeIfAbsent(item, i -> {
+			var stack = new ItemStack(i);
+			creator.accept(stack);
+			return stack;
+		});
+	}
+
+	public void accept(ServerWorld world, BlockPos pos) {
+		var state = world.getBlockState(pos);
+
+		if (state.hasBlockEntity()) {
+			var blockEntity = world.getBlockEntity(pos);
+
+			if (blockEntity == null) {
+				BuildRush.LOGGER.warn("Block entity was null for " + state.getBlock() + " even though the game said it had one");
+			}
+
+			this.accept(world, pos, state, blockEntity);
+		} else {
+			this.accept(world, pos, state, null);
+		}
+	}
+
+	public void accept(ServerWorld world, BlockPos pos, BlockState state, @Nullable BlockEntity blockEntity) {
+		if (isIgnored(state)) return;
+
+		var block = state.getBlock();
+		var pickStack = block.getPickStack(world, pos, state);
+
+		// Blocks requiring tools
+		if (needsFlintAndSteel(state)) {
+			this.addSingletonStack(Items.FLINT_AND_STEEL, BuildItemCollector::setUnbreakable);
+		}
+
+		if (block instanceof CampfireBlock && !state.get(CampfireBlock.LIT)) {
+			this.addSingletonStack(Items.IRON_SHOVEL, BuildItemCollector::setUnbreakable);
+		}
+
+		// Fluids
+		var fluid = state.getFluidState().getFluid();
+
+		if (fluid == Fluids.WATER) {
+			this.addCount(Items.WATER_BUCKET, 1);
+		}
+
+		if (block == Blocks.WATER_CAULDRON) {
+			for (int i = 0; i < state.get(LeveledCauldronBlock.LEVEL); i++) {
+				this.add(PotionUtil.setPotion(new ItemStack(Items.POTION), Potions.WATER));
+			}
+		}
+
+		if (fluid == Fluids.LAVA || block == Blocks.LAVA_CAULDRON) {
+			this.addCount(Items.LAVA_BUCKET, 1);
+		}
+
+		// Multiblocks
+		setCount(pickStack, state, Properties.EGGS);
+		setCount(pickStack, state, Properties.CANDLES);
+		setCount(pickStack, state, Properties.FLOWER_AMOUNT);
+		setCount(pickStack, state, Properties.LAYERS);
+		setCount(pickStack, state, Properties.PICKLES);
+
+		if (block instanceof MultifaceGrowthBlock) {
+			pickStack.setCount(MultifaceGrowthBlock.collectDirections(state).size());
+		}
+
+		if (block instanceof SlabBlock && state.get(SlabBlock.TYPE) == SlabType.DOUBLE) {
+			pickStack.setCount(pickStack.getCount() * 2);
+		}
+
+		if (block instanceof VineBlock) {
+			int count = 0;
+
+			if (state.get(VineBlock.UP)) count++;
+			if (state.get(VineBlock.NORTH)) count++;
+			if (state.get(VineBlock.EAST)) count++;
+			if (state.get(VineBlock.SOUTH)) count++;
+			if (state.get(VineBlock.WEST)) count++;
+
+			pickStack.setCount(count);
+		}
+
+		// Blocks containing items
+		if (block instanceof BrewingStandBlock) {
+			for (var property : BrewingStandBlock.BOTTLE_PROPERTIES) {
+				this.addCount(Items.GLASS_BOTTLE, state.get(property) ? 1 : 0);
+			}
+		}
+
+		if (block instanceof CandleCakeBlockAccessor cake) {
+			this.addCount(cake.buildrush$getCandle(), 1);
+		}
+
+		if (block instanceof ChiseledBookshelfBlock) {
+			for (var property : ChiseledBookshelfBlock.SLOT_OCCUPIED_PROPERTIES) {
+				this.addCount(Items.BOOK, state.get(property) ? 1 : 0);
+			}
+		}
+
+		if (block instanceof EndPortalFrameBlock && state.get(EndPortalFrameBlock.EYE)) {
+			this.addCount(Items.ENDER_EYE, 1);
+		}
+
+		if (block instanceof FlowerPotBlock && block != Blocks.FLOWER_POT) {
+			this.addCount(Items.FLOWER_POT, 1);
+		}
+
+		if (block instanceof LecternBlock && state.get(LecternBlock.HAS_BOOK)) {
+			this.addCount(Items.BOOK, 1);
+		}
+
+		if (block instanceof RespawnAnchorBlock) {
+			this.addCount(Items.GLOWSTONE, state.get(RespawnAnchorBlock.CHARGES));
+		}
+
+		// Block entities
+		if (blockEntity != null) {
+			BuildItemCollector.addBlockEntityNbt(pickStack, blockEntity);
+		}
+
+		this.add(pickStack);
+	}
+
+	public List<ItemStack> getStacks() {
+		var stacks = new ArrayList<ItemStack>();
+
+		for (var entry : this.counts.object2IntEntrySet()) {
+			var item = entry.getKey();
+			int count = entry.getIntValue();
+
+			while (count > 0) {
+				ItemStack stack = new ItemStack(item, Math.min(count, item.getMaxCount()));
+				count -= stack.getCount();
+
+				stacks.add(stack);
+			}
+		}
+
+		stacks.addAll(this.additionalStacks);
+		stacks.addAll(this.singletonStacks.values());
+
+		stacks.sort(COMPARATOR);
+		return stacks;
+	}
+
+	public boolean isSingletonStack(ItemStack stack) {
+		return this.singletonStacks.containsValue(stack);
+	}
+
+	private static boolean isIgnored(BlockState state) {
+		if (state.isAir()) return true;
+
+		// Multipart blocks
+		if (state.isOf(Blocks.PISTON_HEAD)) return true;
+
+		// Multipart block states
+		if (isPropertyValue(state, Properties.DOUBLE_BLOCK_HALF, DoubleBlockHalf.LOWER)) return true;
+		if (isPropertyValue(state, Properties.BED_PART, BedPart.FOOT)) return true;
+
+		return false;
+	}
+
+	private static <T extends Comparable<T>> boolean isPropertyValue(BlockState state, Property<T> property, T value) {
+		return state.contains(property) && state.get(property) == value;
+	}
+
+	private static boolean needsFlintAndSteel(BlockState state) {
+		var block = state.getBlock();
+
+		if (block instanceof CandleBlock) return state.get(CandleBlock.LIT);
+		if (block instanceof CandleCakeBlock) return state.get(CandleCakeBlock.LIT); 
+
+		return state.isIn(BlockTags.PORTALS) || state.isIn(BlockTags.FIRE);
+	}
+
+	private static void setCount(ItemStack stack, BlockState state, IntProperty property) {
+		if (state.contains(property)) {
+			stack.setCount(state.get(property));
+		}
+	}
+
+	private static void setUnbreakable(ItemStack stack) {
+		stack.getOrCreateNbt().putBoolean("Unbreakable", true);
+	}
+
+	public static void addBlockEntityNbt(ItemStack stack, BlockEntity blockEntity) {
+		NbtCompound nbtCompound = blockEntity.createNbtWithIdentifyingData();
+		BlockItem.setBlockEntityNbt(stack, blockEntity.getType(), nbtCompound);
+		if (stack.getItem() instanceof PlayerHeadItem && nbtCompound.contains("SkullOwner")) {
+			NbtCompound nbtCompound2 = nbtCompound.getCompound("SkullOwner");
+			NbtCompound nbtCompound3 = stack.getOrCreateNbt();
+			nbtCompound3.put("SkullOwner", nbtCompound2);
+			NbtCompound nbtCompound4 = nbtCompound3.getCompound("BlockEntityTag");
+			nbtCompound4.remove("SkullOwner");
+			nbtCompound4.remove("x");
+			nbtCompound4.remove("y");
+			nbtCompound4.remove("z");
+		}
+	}
+}