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package redis.clients.jedis;

import java.util.Collection;
import java.util.function.Function;

import redis.clients.jedis.params.ScanParams;
import redis.clients.jedis.Protocol.Keyword;
import redis.clients.jedis.providers.ConnectionProvider;
import redis.clients.jedis.resps.ScanResult;
import redis.clients.jedis.util.JedisCommandIterationBase;

public class ScanIteration extends JedisCommandIterationBase, String> {

  private final int count;
  private final Function args;

  public ScanIteration(ConnectionProvider connectionProvider, int batchCount, String match) {
    super(connectionProvider, BuilderFactory.SCAN_RESPONSE);
    this.count = batchCount;
    this.args = (cursor) -> new CommandArguments(Protocol.Command.SCAN).add(cursor)
        .add(Keyword.MATCH).add(match).add(Keyword.COUNT).add(count);
  }

  public ScanIteration(ConnectionProvider connectionProvider, int batchCount, String match, String type) {
    super(connectionProvider, BuilderFactory.SCAN_RESPONSE);
    this.count = batchCount;
    this.args = (cursor) -> new CommandArguments(Protocol.Command.SCAN).add(cursor)
        .add(Keyword.MATCH).add(match).add(Keyword.COUNT).add(count).add(Keyword.TYPE).add(type);
  }

  @Override
  protected boolean isNodeCompleted(ScanResult reply) {
    return reply.isCompleteIteration();
  }

  @Override
  protected CommandArguments initCommandArguments() {
    return args.apply(ScanParams.SCAN_POINTER_START);
  }

  @Override
  protected CommandArguments nextCommandArguments(ScanResult lastReply) {
    return args.apply(lastReply.getCursor());
  }

  @Override
  protected Collection convertBatchToData(ScanResult batch) {
    return batch.getResult();
  }
}