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package org.infinispan.server.resp.commands.hash;

import java.util.List;
import java.util.concurrent.CompletionStage;

import org.infinispan.multimap.impl.EmbeddedMultimapPairCache;
import org.infinispan.server.resp.Resp3Handler;
import org.infinispan.server.resp.RespCommand;
import org.infinispan.server.resp.RespRequestHandler;
import org.infinispan.server.resp.commands.Resp3Command;

import io.netty.channel.ChannelHandlerContext;

/**
 * `HLEN key` command.
 * 
 *    Retrieve the size of the hash map stored under the given key.
 * 
 *
 * @since 15.0
 * @see Redis Documentation
 * @author José Bolina
 */
public class HLEN extends RespCommand implements Resp3Command {

   public HLEN() {
      super(2, 1, 1, 1);
   }

   @Override
   public CompletionStage perform(Resp3Handler handler, ChannelHandlerContext ctx, List arguments) {
      EmbeddedMultimapPairCache multimap = handler.getHashMapMultimap();
      return handler.stageToReturn(multimap.size(arguments.get(0)), ctx, HSET.CONSUMER);
   }
}