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.SimpleCommandExceptionType;
import com.mojang.brigadier.suggestion.Suggestions;
import com.mojang.brigadier.suggestion.SuggestionsBuilder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import net.minecraft.commands.CommandSourceStack;
import net.minecraft.commands.SharedSuggestionProvider;
import net.minecraft.commands.arguments.selector.EntitySelector;
import net.minecraft.commands.arguments.selector.EntitySelectorParser;
import net.minecraft.network.chat.Component;
import net.minecraft.server.level.ServerPlayer;
import net.minecraft.server.permissions.Permissions;
import net.minecraft.server.players.NameAndId;

public class GameProfileArgument implements ArgumentType<GameProfileArgument.Result> {
	private static final Collection<String> EXAMPLES = Arrays.asList("Player", "0123", "dd12be42-52a9-4a91-a8a1-11c01849e498", "@e");
	public static final SimpleCommandExceptionType ERROR_UNKNOWN_PLAYER = new SimpleCommandExceptionType(Component.translatable("argument.player.unknown"));

	public static Collection<NameAndId> getGameProfiles(final CommandContext<CommandSourceStack> source, final String name) throws CommandSyntaxException {
		return source.<GameProfileArgument.Result>getArgument(name, GameProfileArgument.Result.class).getNames(source.getSource());
	}

	public static GameProfileArgument gameProfile() {
		return new GameProfileArgument();
	}

	public <S> GameProfileArgument.Result parse(final StringReader reader, final S source) throws CommandSyntaxException {
		return parse(reader, EntitySelectorParser.allowSelectors(source));
	}

	public GameProfileArgument.Result parse(final StringReader reader) throws CommandSyntaxException {
		return parse(reader, true);
	}

	private static GameProfileArgument.Result parse(final StringReader reader, final boolean allowSelectors) throws CommandSyntaxException {
		if (reader.canRead() && reader.peek() == '@') {
			EntitySelectorParser parser = new EntitySelectorParser(reader, allowSelectors);
			EntitySelector parse = parser.parse();
			if (parse.includesEntities()) {
				throw EntityArgument.ERROR_ONLY_PLAYERS_ALLOWED.createWithContext(reader);
			} else {
				return new GameProfileArgument.SelectorResult(parse);
			}
		} else {
			int start = reader.getCursor();

			while (reader.canRead() && reader.peek() != ' ') {
				reader.skip();
			}

			String name = reader.getString().substring(start, reader.getCursor());
			return c -> {
				Optional<NameAndId> result = c.getServer().services().nameToIdCache().get(name);
				return Collections.singleton((NameAndId)result.orElseThrow(ERROR_UNKNOWN_PLAYER::create));
			};
		}
	}

	@Override
	public <S> CompletableFuture<Suggestions> listSuggestions(final CommandContext<S> contextBuilder, final SuggestionsBuilder builder) {
		if (contextBuilder.getSource() instanceof SharedSuggestionProvider source) {
			StringReader reader = new StringReader(builder.getInput());
			reader.setCursor(builder.getStart());
			EntitySelectorParser parser = new EntitySelectorParser(reader, source.permissions().hasPermission(Permissions.COMMANDS_ENTITY_SELECTORS));

			try {
				parser.parse();
			} catch (CommandSyntaxException var7) {
			}

			return parser.fillSuggestions(builder, suggestions -> SharedSuggestionProvider.suggest(source.getOnlinePlayerNames(), suggestions));
		} else {
			return Suggestions.empty();
		}
	}

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

	@FunctionalInterface
	public interface Result {
		Collection<NameAndId> getNames(final CommandSourceStack sender) throws CommandSyntaxException;
	}

	public static class SelectorResult implements GameProfileArgument.Result {
		private final EntitySelector selector;

		public SelectorResult(final EntitySelector selector) {
			this.selector = selector;
		}

		@Override
		public Collection<NameAndId> getNames(final CommandSourceStack sender) throws CommandSyntaxException {
			List<ServerPlayer> players = this.selector.findPlayers(sender);
			if (players.isEmpty()) {
				throw EntityArgument.NO_PLAYERS_FOUND.create();
			} else {
				List<NameAndId> result = new ArrayList();

				for (ServerPlayer entity : players) {
					result.add(entity.nameAndId());
				}

				return result;
			}
		}
	}
}