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

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

import org.infinispan.multimap.impl.EmbeddedSetCache;
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;

/**
 * SREM implementation, see:
 * @link https://redis.io/commands/srem/
 * @since 15.0
 */
public class SREM extends RespCommand implements Resp3Command {
   public SREM() {
      super(-3, 1, 1, 1);
   }

   @Override
   public CompletionStage<RespRequestHandler> perform(Resp3Handler handler,
                                                      ChannelHandlerContext ctx,
                                                      List<byte[]> arguments) {

      byte[] key = arguments.get(0);
      EmbeddedSetCache<byte[],byte[]> esc = handler.getEmbeddedSetCache();
      CompletionStage<Long> result = esc.remove(key, arguments.subList(1, arguments.size()));
      return handler.stageToReturn(result, ctx, Resp3Response.INTEGER);
   }
}
