package net.minecraft.commands.arguments;

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.DynamicCommandExceptionType;
import com.mojang.brigadier.suggestion.Suggestions;
import com.mojang.brigadier.suggestion.SuggestionsBuilder;
import java.util.Collection;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import net.minecraft.commands.CommandSourceStack;
import net.minecraft.commands.SharedSuggestionProvider;
import net.minecraft.core.registries.Registries;
import net.minecraft.network.chat.Component;
import net.minecraft.resources.Identifier;
import net.minecraft.resources.ResourceKey;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.world.level.Level;

public class DimensionArgument implements ArgumentType<Identifier> {
	private static final Collection<String> EXAMPLES = (Collection<String>)Stream.of(Level.OVERWORLD, Level.NETHER)
		.map(key -> key.identifier().toString())
		.collect(Collectors.toList());
	private static final DynamicCommandExceptionType ERROR_INVALID_VALUE = new DynamicCommandExceptionType(
		value -> Component.translatableEscape("argument.dimension.invalid", value)
	);

	public Identifier parse(final StringReader reader) throws CommandSyntaxException {
		return Identifier.read(reader);
	}

	@Override
	public <S> CompletableFuture<Suggestions> listSuggestions(final CommandContext<S> context, final SuggestionsBuilder builder) {
		return context.getSource() instanceof SharedSuggestionProvider
			? SharedSuggestionProvider.suggestResource(((SharedSuggestionProvider)context.getSource()).levels().stream().map(ResourceKey::identifier), builder)
			: Suggestions.empty();
	}

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

	public static DimensionArgument dimension() {
		return new DimensionArgument();
	}

	public static ServerLevel getDimension(final CommandContext<CommandSourceStack> context, final String name) throws CommandSyntaxException {
		Identifier location = context.getArgument(name, Identifier.class);
		ResourceKey<Level> key = ResourceKey.create(Registries.DIMENSION, location);
		ServerLevel level = context.getSource().getServer().getLevel(key);
		if (level == null) {
			throw ERROR_INVALID_VALUE.create(location);
		} else {
			return level;
		}
	}
}