/*
 * Ceph - scalable distributed file system
 *
 * Copyright (C) 2015 CERN
 *
 * Author: Joaquim Rocha <joaquim.rocha@cern.ch>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 */

#include "cls/numops/cls_numops_client.h"
#include "include/encoding.h"
#include "include/rados/librados.hpp"

#include <errno.h>
#include <sstream>

namespace rados {
  namespace cls {
    namespace numops {

      int add(librados::IoCtx *ioctx,
              const std::string& oid,
              const std::string& key,
              double value_to_add)
      {
        bufferlist in;
        encode(key, in);

        std::stringstream stream;
        stream << value_to_add;

        encode(stream.str(), in);

        librados::ObjectWriteOperation op;
        op.exec("numops", "add", in);

        return ioctx->operate(oid, &op);
      }

      int sub(librados::IoCtx *ioctx,
              const std::string& oid,
              const std::string& key,
              double value_to_subtract)
      {
        return add(ioctx, oid, key, -value_to_subtract);
      }

      int mul(librados::IoCtx *ioctx,
              const std::string& oid,
              const std::string& key,
              double value_to_multiply)
      {
        bufferlist in, out;
        encode(key, in);

        std::stringstream stream;
        stream << value_to_multiply;

        encode(stream.str(), in);

        librados::ObjectWriteOperation op;
        op.exec("numops", "mul", in);

        return ioctx->operate(oid, &op);
      }

      int div(librados::IoCtx *ioctx,
              const std::string& oid,
              const std::string& key,
              double value_to_divide)
      {
        if (value_to_divide == 0)
          return -EINVAL;

        return mul(ioctx, oid, key, 1 / value_to_divide);
      }

    } // namespace numops
  } // namespace cls
} // namespace rados
