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

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

import org.infinispan.multimap.impl.EmbeddedSetCache;
import org.infinispan.server.resp.Consumers;
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.logging.Log;

import io.netty.channel.ChannelHandlerContext;

/**
 * SMOVE implementation, see:
 * {@link} https://redis.io/commands/smove/
 * Atomicity warning:
 * Derogating to the above description, this implementation is not atomic:
 * is it possible that, moving an existing element in source, at a given
 * time a client
 * can observe that element doesn't exists both in source and destination.
 * @since 15.0
 */
public class SMOVE extends RespCommand implements Resp3Command {
   public SMOVE() {
      super(4, 1, 2, 1);
   }

   @Override
   public CompletionStage perform(Resp3Handler handler,
         ChannelHandlerContext ctx,
         List arguments) {
      final var source = arguments.get(0);
      final var destination = arguments.get(1);
      final var element = arguments.get(2);

      boolean sameList = Arrays.equals(source, destination);
      EmbeddedSetCache esc = handler.getEmbeddedSetCache();
      CompletionStage resultStage = null;
      if (!sameList) {
         // warn when different sets
         Log.SERVER.smoveConsistencyMessage();
         resultStage = esc.remove(source, element).thenCompose(
               (removed) -> removed == 0 ? CompletableFuture.completedFuture(removed) : esc.add(destination, element));
         return handler.stageToReturn(resultStage, ctx, Consumers.LONG_BICONSUMER);
      }
      return handler.stageToReturn(esc.get(source)
            .thenApply((bucket) -> bucket.contains(element) ? 1L : 0L), ctx, Consumers.LONG_BICONSUMER);
   }
}