package net.minecraft.commands.arguments.coordinates;

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.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.CompletableFuture;
import net.minecraft.commands.CommandSourceStack;
import net.minecraft.commands.Commands;
import net.minecraft.commands.SharedSuggestionProvider;
import net.minecraft.core.BlockPos;
import net.minecraft.network.chat.Component;
import net.minecraft.server.level.ColumnPos;

public class ColumnPosArgument implements ArgumentType<Coordinates> {
	private static final Collection<String> EXAMPLES = Arrays.asList("0 0", "~ ~", "~1 ~-2", "^ ^", "^-1 ^0");
	public static final SimpleCommandExceptionType ERROR_NOT_COMPLETE = new SimpleCommandExceptionType(Component.translatable("argument.pos2d.incomplete"));

	public static ColumnPosArgument columnPos() {
		return new ColumnPosArgument();
	}

	public static ColumnPos getColumnPos(final CommandContext<CommandSourceStack> context, final String name) {
		BlockPos pos = context.<Coordinates>getArgument(name, Coordinates.class).getBlockPos(context.getSource());
		return new ColumnPos(pos.getX(), pos.getZ());
	}

	public Coordinates parse(final StringReader reader) throws CommandSyntaxException {
		int start = reader.getCursor();
		if (!reader.canRead()) {
			throw ERROR_NOT_COMPLETE.createWithContext(reader);
		} else {
			WorldCoordinate x = WorldCoordinate.parseInt(reader);
			if (reader.canRead() && reader.peek() == ' ') {
				reader.skip();
				WorldCoordinate z = WorldCoordinate.parseInt(reader);
				return new WorldCoordinates(x, new WorldCoordinate(true, 0.0), z);
			} else {
				reader.setCursor(start);
				throw ERROR_NOT_COMPLETE.createWithContext(reader);
			}
		}
	}

	@Override
	public <S> CompletableFuture<Suggestions> listSuggestions(final CommandContext<S> context, final SuggestionsBuilder builder) {
		if (!(context.getSource() instanceof SharedSuggestionProvider)) {
			return Suggestions.empty();
		} else {
			String remainder = builder.getRemaining();
			Collection<SharedSuggestionProvider.TextCoordinates> suggestedCoordinates;
			if (!remainder.isEmpty() && remainder.charAt(0) == '^') {
				suggestedCoordinates = Collections.singleton(SharedSuggestionProvider.TextCoordinates.DEFAULT_LOCAL);
			} else {
				suggestedCoordinates = ((SharedSuggestionProvider)context.getSource()).getRelevantCoordinates();
			}

			return SharedSuggestionProvider.suggest2DCoordinates(remainder, suggestedCoordinates, builder, Commands.createValidator(this::parse));
		}
	}

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