package net.minecraft.commands.arguments;

import com.google.gson.JsonObject;
import com.mojang.brigadier.StringReader;
import com.mojang.brigadier.arguments.ArgumentType;
import com.mojang.brigadier.context.CommandContext;
import com.mojang.brigadier.exceptions.CommandSyntaxException;
import com.mojang.brigadier.exceptions.Dynamic2CommandExceptionType;
import com.mojang.brigadier.suggestion.Suggestions;
import com.mojang.brigadier.suggestion.SuggestionsBuilder;
import java.util.Collection;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.CompletableFuture;
import net.minecraft.commands.CommandBuildContext;
import net.minecraft.commands.CommandSourceStack;
import net.minecraft.commands.SharedSuggestionProvider;
import net.minecraft.commands.synchronization.ArgumentTypeInfo;
import net.minecraft.core.Holder;
import net.minecraft.core.HolderLookup;
import net.minecraft.core.Registry;
import net.minecraft.network.FriendlyByteBuf;
import net.minecraft.network.chat.Component;
import net.minecraft.resources.Identifier;
import net.minecraft.resources.ResourceKey;
import org.apache.commons.io.FilenameUtils;

public class ResourceSelectorArgument<T> implements ArgumentType<Collection<Holder.Reference<T>>> {
	private static final Collection<String> EXAMPLES = List.of("minecraft:*", "*:asset", "*");
	public static final Dynamic2CommandExceptionType ERROR_NO_MATCHES = new Dynamic2CommandExceptionType(
		(selector, registry) -> Component.translatableEscape("argument.resource_selector.not_found", selector, registry)
	);
	private final ResourceKey<? extends Registry<T>> registryKey;
	private final HolderLookup<T> registryLookup;

	private ResourceSelectorArgument(final CommandBuildContext context, final ResourceKey<? extends Registry<T>> registryKey) {
		this.registryKey = registryKey;
		this.registryLookup = context.lookupOrThrow(registryKey);
	}

	public Collection<Holder.Reference<T>> parse(final StringReader reader) throws CommandSyntaxException {
		String pattern = ensureNamespaced(readPattern(reader));
		List<Holder.Reference<T>> results = this.registryLookup.listElements().filter(element -> matches(pattern, element.key().identifier())).toList();
		if (results.isEmpty()) {
			throw ERROR_NO_MATCHES.createWithContext(reader, pattern, this.registryKey.identifier());
		} else {
			return results;
		}
	}

	public static <T> Collection<Holder.Reference<T>> parse(final StringReader reader, final HolderLookup<T> registry) {
		String pattern = ensureNamespaced(readPattern(reader));
		return registry.listElements().filter(element -> matches(pattern, element.key().identifier())).toList();
	}

	private static String readPattern(final StringReader reader) {
		int start = reader.getCursor();

		while (reader.canRead() && isAllowedPatternCharacter(reader.peek())) {
			reader.skip();
		}

		return reader.getString().substring(start, reader.getCursor());
	}

	private static boolean isAllowedPatternCharacter(final char character) {
		return Identifier.isAllowedInIdentifier(character) || character == '*' || character == '?';
	}

	private static String ensureNamespaced(final String input) {
		return !input.contains(":") ? "minecraft:" + input : input;
	}

	private static boolean matches(final String pattern, final Identifier key) {
		return FilenameUtils.wildcardMatch(key.toString(), pattern);
	}

	public static <T> ResourceSelectorArgument<T> resourceSelector(final CommandBuildContext context, final ResourceKey<? extends Registry<T>> registry) {
		return new ResourceSelectorArgument<>(context, registry);
	}

	public static <T> Collection<Holder.Reference<T>> getSelectedResources(final CommandContext<CommandSourceStack> context, final String name) {
		return context.getArgument(name, Collection.class);
	}

	@Override
	public <S> CompletableFuture<Suggestions> listSuggestions(final CommandContext<S> context, final SuggestionsBuilder builder) {
		return SharedSuggestionProvider.listSuggestions(context, builder, this.registryKey, SharedSuggestionProvider.ElementSuggestionType.ELEMENTS);
	}

	@Override
	public Collection<String> getExamples() {
		return EXAMPLES;
	}

	public static class Info<T> implements ArgumentTypeInfo<ResourceSelectorArgument<T>, ResourceSelectorArgument.Info<T>.Template> {
		public void serializeToNetwork(final ResourceSelectorArgument.Info<T>.Template template, final FriendlyByteBuf out) {
			out.writeResourceKey(template.registryKey);
		}

		public ResourceSelectorArgument.Info<T>.Template deserializeFromNetwork(final FriendlyByteBuf in) {
			return new ResourceSelectorArgument.Info.Template(in.readRegistryKey());
		}

		public void serializeToJson(final ResourceSelectorArgument.Info<T>.Template template, final JsonObject out) {
			out.addProperty("registry", template.registryKey.identifier().toString());
		}

		public ResourceSelectorArgument.Info<T>.Template unpack(final ResourceSelectorArgument<T> argument) {
			return new ResourceSelectorArgument.Info.Template(argument.registryKey);
		}

		public final class Template implements ArgumentTypeInfo.Template<ResourceSelectorArgument<T>> {
			private final ResourceKey<? extends Registry<T>> registryKey;

			private Template(final ResourceKey<? extends Registry<T>> registryKey) {
				Objects.requireNonNull(Info.this);
				super();
				this.registryKey = registryKey;
			}

			public ResourceSelectorArgument<T> instantiate(final CommandBuildContext context) {
				return new ResourceSelectorArgument<>(context, this.registryKey);
			}

			@Override
			public ArgumentTypeInfo<ResourceSelectorArgument<T>, ?> type() {
				return Info.this;
			}
		}
	}
}