content: package pers.neige.neigeitems.colonel.argument.command;
  
  import kotlin.Unit;
  import lombok.Data;
  import lombok.NonNull;
  import lombok.val;
  import org.bukkit.command.CommandSender;
  import org.jetbrains.annotations.Nullable;
  import pers.neige.colonel.arguments.Argument;
  import pers.neige.colonel.arguments.ParseResult;
  import pers.neige.colonel.context.Context;
  import pers.neige.colonel.context.NodeChain;
  import pers.neige.colonel.reader.StringReader;
  import pers.neige.neigeitems.action.Action;
  import pers.neige.neigeitems.manager.ActionManager;
  import pers.neige.neigeitems.utils.LangUtils;
  
  import java.util.Collection;
  import java.util.HashMap;
  
  public class FunctionArgument extends Argument<CommandSender, FunctionArgument.FunctionContainer, Unit> {
      public static final FunctionArgument INSTANCE = new FunctionArgument();
  
      private FunctionArgument() {
          setNullFailExecutor((context) -> {
              val sender = context.getSource();
              if (sender == null) return;
              val functionContainer = context.<FunctionContainer>getLastArgument();
              val params = new HashMap<String, String>();
              params.put("{function}", functionContainer.id);
              LangUtils.sendLang(sender, "Messages.invalidFunction", params);
          });
      }
  
      @Override
      @NonNull
      public ParseResult<FunctionContainer> parse(@NonNull NodeChain<CommandSender, Unit> nodeChain, @NonNull StringReader input, @Nullable CommandSender source) {
          val start = input.getOffset();
          val id = input.readString();
          val function = ActionManager.INSTANCE.getFunctions().get(id);
          if (function == null) {
              input.setOffset(start);
              return new ParseResult<>(new FunctionContainer(id, null), false);
          }
          return new ParseResult<>(new FunctionContainer(id, function), true);
      }
  
      @Override
      protected @NonNull Collection<String> rawTab(@NonNull Context<CommandSender, Unit> context, @NonNull String remaining) {
          return ActionManager.INSTANCE.getFunctions().keySet();
      }
  
      @Data
      public static class FunctionContainer {
          private final @NonNull String id;
          private final @Nullable Action function;
      }
  }
  