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

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

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 org.infinispan.server.resp.serialization.Resp3Response;

import io.netty.channel.ChannelHandlerContext;

/**
 * `HEXISTS key field` command.
 * 
 *    Verify if the specified field exists in the hash stored at key. Returns 1 if true,
 *    or 0, otherwise.
 * 
 *
 * @since 15.0
 * @see Redis Documentation
 * @author José Bolina
 */
public class HEXISTS extends RespCommand implements Resp3Command {

   static final Function CONVERTER = b -> b ? 1L : 0L;

   public HEXISTS() {
      super(3, 1, 1, 1);
   }

   @Override
   public CompletionStage perform(Resp3Handler handler, ChannelHandlerContext ctx, List arguments) {
      EmbeddedMultimapPairCache multimap = handler.getHashMapMultimap();
      CompletionStage cs = multimap.contains(arguments.get(0), arguments.get(1)).thenApply(CONVERTER);
      return handler.stageToReturn(cs, ctx, Resp3Response.INTEGER);
   }
}