package net.minecraft.commands.arguments;

import com.mojang.brigadier.ImmutableStringReader;
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.exceptions.DynamicCommandExceptionType;
import com.mojang.brigadier.suggestion.Suggestions;
import com.mojang.brigadier.suggestion.SuggestionsBuilder;
import com.mojang.serialization.Codec;
import com.mojang.serialization.DynamicOps;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import net.minecraft.commands.CommandBuildContext;
import net.minecraft.commands.CommandSourceStack;
import net.minecraft.commands.SharedSuggestionProvider;
import net.minecraft.core.Holder;
import net.minecraft.core.HolderLookup;
import net.minecraft.core.Registry;
import net.minecraft.core.registries.Registries;
import net.minecraft.nbt.NbtOps;
import net.minecraft.nbt.SnbtGrammar;
import net.minecraft.nbt.Tag;
import net.minecraft.network.chat.Component;
import net.minecraft.resources.Identifier;
import net.minecraft.resources.ResourceKey;
import net.minecraft.server.dialog.Dialog;
import net.minecraft.util.parsing.packrat.Atom;
import net.minecraft.util.parsing.packrat.Dictionary;
import net.minecraft.util.parsing.packrat.NamedRule;
import net.minecraft.util.parsing.packrat.Term;
import net.minecraft.util.parsing.packrat.commands.Grammar;
import net.minecraft.util.parsing.packrat.commands.IdentifierParseRule;
import net.minecraft.world.level.storage.loot.LootTable;
import net.minecraft.world.level.storage.loot.functions.LootItemFunction;
import net.minecraft.world.level.storage.loot.functions.LootItemFunctions;
import net.minecraft.world.level.storage.loot.predicates.LootItemCondition;
import org.jspecify.annotations.Nullable;

public class ResourceOrIdArgument<T> implements ArgumentType<Holder<T>> {
	private static final Collection<String> EXAMPLES = List.of("foo", "foo:bar", "012", "{}", "true");
	public static final DynamicCommandExceptionType ERROR_FAILED_TO_PARSE = new DynamicCommandExceptionType(
		error -> Component.translatableEscape("argument.resource_or_id.failed_to_parse", error)
	);
	public static final Dynamic2CommandExceptionType ERROR_NO_SUCH_ELEMENT = new Dynamic2CommandExceptionType(
		(id, registry) -> Component.translatableEscape("argument.resource_or_id.no_such_element", id, registry)
	);
	public static final DynamicOps<Tag> OPS = NbtOps.INSTANCE;
	private final HolderLookup.Provider registryLookup;
	private final Optional<? extends HolderLookup.RegistryLookup<T>> elementLookup;
	private final Codec<T> codec;
	private final Grammar<ResourceOrIdArgument.Result<T, Tag>> grammar;
	private final ResourceKey<? extends Registry<T>> registryKey;

	protected ResourceOrIdArgument(final CommandBuildContext context, final ResourceKey<? extends Registry<T>> registryKey, final Codec<T> codec) {
		this.registryLookup = context;
		this.elementLookup = context.lookup(registryKey);
		this.registryKey = registryKey;
		this.codec = codec;
		this.grammar = createGrammar(registryKey, OPS);
	}

	public static <T, O> Grammar<ResourceOrIdArgument.Result<T, O>> createGrammar(final ResourceKey<? extends Registry<T>> registryKey, final DynamicOps<O> ops) {
		Grammar<O> inlineValueGrammar = SnbtGrammar.createParser(ops);
		Dictionary<StringReader> rules = new Dictionary<>();
		Atom<ResourceOrIdArgument.Result<T, O>> result = Atom.of("result");
		Atom<Identifier> id = Atom.of("id");
		Atom<O> value = Atom.of("value");
		rules.put(id, IdentifierParseRule.INSTANCE);
		rules.put(value, inlineValueGrammar.top().value());
		NamedRule<StringReader, ResourceOrIdArgument.Result<T, O>> topRule = rules.put(result, Term.alternative(rules.named(id), rules.named(value)), scope -> {
			Identifier parsedId = scope.get(id);
			if (parsedId != null) {
				return new ResourceOrIdArgument.ReferenceResult<>(ResourceKey.create(registryKey, parsedId));
			} else {
				O parsedInline = scope.getOrThrow(value);
				return new ResourceOrIdArgument.InlineResult<>(parsedInline);
			}
		});
		return new Grammar<>(rules, topRule);
	}

	public static ResourceOrIdArgument.LootTableArgument lootTable(final CommandBuildContext context) {
		return new ResourceOrIdArgument.LootTableArgument(context);
	}

	public static Holder<LootTable> getLootTable(final CommandContext<CommandSourceStack> context, final String name) throws CommandSyntaxException {
		return getResource(context, name);
	}

	public static ResourceOrIdArgument.LootModifierArgument lootModifier(final CommandBuildContext context) {
		return new ResourceOrIdArgument.LootModifierArgument(context);
	}

	public static Holder<LootItemFunction> getLootModifier(final CommandContext<CommandSourceStack> context, final String name) {
		return getResource(context, name);
	}

	public static ResourceOrIdArgument.LootPredicateArgument lootPredicate(final CommandBuildContext context) {
		return new ResourceOrIdArgument.LootPredicateArgument(context);
	}

	public static Holder<LootItemCondition> getLootPredicate(final CommandContext<CommandSourceStack> context, final String name) {
		return getResource(context, name);
	}

	public static ResourceOrIdArgument.DialogArgument dialog(final CommandBuildContext context) {
		return new ResourceOrIdArgument.DialogArgument(context);
	}

	public static Holder<Dialog> getDialog(final CommandContext<CommandSourceStack> context, final String name) {
		return getResource(context, name);
	}

	private static <T> Holder<T> getResource(final CommandContext<CommandSourceStack> context, final String name) {
		return context.getArgument(name, Holder.class);
	}

	@Nullable
	public Holder<T> parse(final StringReader reader) throws CommandSyntaxException {
		return this.parse(reader, this.grammar, OPS);
	}

	@Nullable
	private <O> Holder<T> parse(final StringReader reader, final Grammar<ResourceOrIdArgument.Result<T, O>> grammar, final DynamicOps<O> ops) throws CommandSyntaxException {
		ResourceOrIdArgument.Result<T, O> contents = grammar.parseForCommands(reader);
		return this.elementLookup.isEmpty()
			? null
			: contents.parse(reader, this.registryLookup, ops, this.codec, (HolderLookup.RegistryLookup<T>)this.elementLookup.get());
	}

	@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 DialogArgument extends ResourceOrIdArgument<Dialog> {
		protected DialogArgument(final CommandBuildContext context) {
			super(context, Registries.DIALOG, Dialog.DIRECT_CODEC);
		}
	}

	public record InlineResult<T, O>(O value) implements ResourceOrIdArgument.Result<T, O> {
		@Override
		public Holder<T> parse(
			final ImmutableStringReader reader,
			final HolderLookup.Provider lookup,
			final DynamicOps<O> ops,
			final Codec<T> codec,
			final HolderLookup.RegistryLookup<T> elementLookup
		) throws CommandSyntaxException {
			return Holder.direct(
				codec.parse(lookup.createSerializationContext(ops), this.value)
					.getOrThrow(msg -> ResourceOrIdArgument.ERROR_FAILED_TO_PARSE.createWithContext(reader, msg))
			);
		}
	}

	public static class LootModifierArgument extends ResourceOrIdArgument<LootItemFunction> {
		protected LootModifierArgument(final CommandBuildContext context) {
			super(context, Registries.ITEM_MODIFIER, LootItemFunctions.ROOT_CODEC);
		}
	}

	public static class LootPredicateArgument extends ResourceOrIdArgument<LootItemCondition> {
		protected LootPredicateArgument(final CommandBuildContext context) {
			super(context, Registries.PREDICATE, LootItemCondition.DIRECT_CODEC);
		}
	}

	public static class LootTableArgument extends ResourceOrIdArgument<LootTable> {
		protected LootTableArgument(final CommandBuildContext context) {
			super(context, Registries.LOOT_TABLE, LootTable.DIRECT_CODEC);
		}
	}

	public record ReferenceResult<T, O>(ResourceKey<T> key) implements ResourceOrIdArgument.Result<T, O> {
		@Override
		public Holder<T> parse(
			final ImmutableStringReader reader,
			final HolderLookup.Provider lookup,
			final DynamicOps<O> ops,
			final Codec<T> codec,
			final HolderLookup.RegistryLookup<T> elementLookup
		) throws CommandSyntaxException {
			return (Holder<T>)elementLookup.get(this.key)
				.orElseThrow(() -> ResourceOrIdArgument.ERROR_NO_SUCH_ELEMENT.createWithContext(reader, this.key.identifier(), this.key.registry()));
		}
	}

	public sealed interface Result<T, O> permits ResourceOrIdArgument.InlineResult, ResourceOrIdArgument.ReferenceResult {
		Holder<T> parse(ImmutableStringReader reader, HolderLookup.Provider lookup, DynamicOps<O> ops, Codec<T> codec, HolderLookup.RegistryLookup<T> elementLookup) throws CommandSyntaxException;
	}
}