package info.u_team.u_team_core.data;

import java.io.IOException;
import java.nio.file.Path;
import java.util.*;
import java.util.function.Predicate;
import java.util.stream.Collectors;

import com.google.common.collect.Maps;
import com.google.gson.JsonObject;

import net.minecraft.data.*;
import net.minecraft.data.TagsProvider.Builder;
import net.minecraft.tags.*;
import net.minecraft.tags.ITag.*;
import net.minecraft.util.ResourceLocation;
import net.minecraft.util.registry.Registry;

public abstract class CommonTagsProvider<T> extends CommonProvider {
	
	protected final Registry<T> registry;
	protected final Map<ResourceLocation, ITag.Builder> tagToBuilder = Maps.newLinkedHashMap();
	
	public CommonTagsProvider(GenerationData data, Registry<T> registry) {
		super(data);
		this.registry = registry;
	}
	
	protected abstract void registerTags();
	
	@Override
	public void act(DirectoryCache cache) {
		tagToBuilder.clear();
		registerTags();
		
		tagToBuilder.forEach((location, builder) -> {
			final List<ITag.Proxy> list = builder.func_232963_b_(id -> Tag.func_241284_a_(), id -> registry.func_241873_b(id).orElse(null)).collect(Collectors.toList());
			if (!list.isEmpty()) {
				throw new IllegalArgumentException(String.format("Couldn't define tag %s as it is missing following references: %s", location, list.stream().map(Objects::toString).collect(Collectors.joining(","))));
			}
			final JsonObject object = builder.serialize();
			final Path path = makePath(location);
			try {
				write(cache, object, path);
			} catch (final IOException ex) {
				LOGGER.error(marker, "Could not write data.", ex);
			}
		});
	}
	
	protected abstract Path makePath(ResourceLocation location);
	
	protected TagsProvider.Builder<T> getBuilder(ITag.INamedTag<T> tag) {
		final ITag.Builder tagBuilder = getTagBuilder(tag);
		return new UniqueBuilder<>(tagBuilder, registry, modid);
	}
	
	protected ITag.Builder getTagBuilder(ITag.INamedTag<T> tag) {
		return this.tagToBuilder.computeIfAbsent(tag.getName(), location -> new ITag.Builder());
	}
	
	public static class UniqueBuilder<T> extends TagsProvider.Builder<T> {
		
		private final Registry<T> registry;
		
		public UniqueBuilder(ITag.Builder builder, Registry<T> registry, String id) {
			super(builder, registry, id);
			this.registry = registry;
		}
		
		@Override
		public Builder<T> addItemEntry(T item) {
			final ResourceLocation location = registry.getKey(item);
			return super.addItemEntry(item);
		}
		
		private <C extends ITagEntry> void canAdd(Class<C> clazz, Predicate<? super C> predicate, Runnable add) {
			final boolean duplicate = getInternalBuilder().getProxyStream() //
					.map(Proxy::getEntry) //
					.filter(clazz::isInstance) //
					.map(clazz::cast) //
					.anyMatch(predicate);
			if (!duplicate) {
				add.run();
			}
		}
		
	}
}
@@ -138,25 +138,17 @@
 unction.
-Predicate
+*
 ;%0D%0Aimpor
@@ -2491,16 +2491,21 @@
 item);%0D%0A
+%09%09%09%0D%0A
 %09%09%09retur
@@ -2574,20 +2574,26 @@
 gEntry%3E 
-void
+Builder%3CT%3E
  canAdd(
@@ -2644,16 +2644,28 @@
 te, 
-Runnable
+Supplier%3CBuilder%3CT%3E%3E
  add
@@ -2892,15 +2892,22 @@
 %09%09%09%09
+return 
 add.
-run
+get
 ();%0D
@@ -2913,16 +2913,33 @@
 %0D%0A%09%09%09%7D%0D%0A
+%09%09%09return this;%0D%0A
 %09%09%7D%0D%0A%09%09%0D

Update method a bit