package net.minecraft.server.commands;

import com.mojang.brigadier.CommandDispatcher;
import com.mojang.brigadier.exceptions.CommandSyntaxException;
import com.mojang.brigadier.exceptions.SimpleCommandExceptionType;
import java.util.Collection;
import net.minecraft.commands.CommandSourceStack;
import net.minecraft.commands.Commands;
import net.minecraft.commands.arguments.GameProfileArgument;
import net.minecraft.commands.arguments.MessageArgument;
import net.minecraft.network.chat.Component;
import net.minecraft.server.level.ServerPlayer;
import net.minecraft.server.players.NameAndId;
import net.minecraft.server.players.UserBanList;
import net.minecraft.server.players.UserBanListEntry;
import org.jspecify.annotations.Nullable;

public class BanPlayerCommands {
	private static final SimpleCommandExceptionType ERROR_ALREADY_BANNED = new SimpleCommandExceptionType(Component.translatable("commands.ban.failed"));

	public static void register(final CommandDispatcher<CommandSourceStack> dispatcher) {
		dispatcher.register(
			Commands.literal("ban")
				.requires(Commands.hasPermission(Commands.LEVEL_ADMINS))
				.then(
					Commands.argument("targets", GameProfileArgument.gameProfile())
						.executes(c -> banPlayers(c.getSource(), GameProfileArgument.getGameProfiles(c, "targets"), null))
						.then(
							Commands.argument("reason", MessageArgument.message())
								.executes(c -> banPlayers(c.getSource(), GameProfileArgument.getGameProfiles(c, "targets"), MessageArgument.getMessage(c, "reason")))
						)
				)
		);
	}

	private static int banPlayers(final CommandSourceStack source, final Collection<NameAndId> players, @Nullable final Component reason) throws CommandSyntaxException {
		UserBanList list = source.getServer().getPlayerList().getBans();
		int count = 0;

		for (NameAndId player : players) {
			if (!list.isBanned(player)) {
				UserBanListEntry entry = new UserBanListEntry(player, null, source.getTextName(), null, reason == null ? null : reason.getString());
				list.add(entry);
				count++;
				source.sendSuccess(() -> Component.translatable("commands.ban.success", Component.literal(player.name()), entry.getReasonMessage()), true);
				ServerPlayer online = source.getServer().getPlayerList().getPlayer(player.id());
				if (online != null) {
					online.connection.disconnect(Component.translatable("multiplayer.disconnect.banned"));
				}
			}
		}

		if (count == 0) {
			throw ERROR_ALREADY_BANNED.create();
		} else {
			return count;
		}
	}
}