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

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

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;

/**
 * @link https://redis.io/commands/append/
 * @since 15.0
 */
public class APPEND extends RespCommand implements Resp3Command {
   public APPEND() {
      super(3, 1, 1, 1);
   }

   @Override
   public CompletionStage perform(Resp3Handler handler,
         ChannelHandlerContext ctx,
         List arguments) {
      return handler
            .stageToReturn(StringMutators.append(handler.cache(), arguments.get(0), arguments.get(1)),
                  ctx, Resp3Response.INTEGER);
   }
}