/* ******************************************************************************
 *
 *
 * This program and the accompanying materials are made available under the
 * terms of the Apache License, Version 2.0 which is available at
 * https://www.apache.org/licenses/LICENSE-2.0.
 *
 *  See the NOTICE file distributed with this work for additional
 *  information regarding copyright ownership.
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 ******************************************************************************/

//
// @author raver119@gmail.com
//

#ifndef LIBND4J_STASH_H
#define LIBND4J_STASH_H

#include <array/NDArray.h>

#include <atomic>
#include <functional>
#include <map>
#include <string>
#include <vector>

namespace sd {
namespace graph {
class SD_LIB_EXPORT KeyPair {
  int _node;
  std::string _name;

 public:
  KeyPair(int node = 0, const char *name = nullptr);

  bool operator<(const KeyPair &other) const;

  bool operator==(const KeyPair &other) const { return _node == other._node; }

  int key() const { return _node; }
  std::string name() const { return _name; }
};
}  // namespace graph
}  // namespace sd

#ifndef __JAVACPP_HACK__

namespace std {
template <>
class SD_LIB_EXPORT hash<sd::graph::KeyPair> {
 public:
  size_t operator()(const sd::graph::KeyPair &k) const;
};
};  // namespace std

#endif

namespace sd {
namespace graph {
class SD_LIB_EXPORT Stash {
 protected:
  std::map<KeyPair, NDArray *> _stash;
  std::vector<NDArray *> _handles;

 public:
  Stash();
  ~Stash();

  void storeArray(int nodeId, const char *name, NDArray *array);

  bool checkStash(int nodeId, const char *name);

  NDArray *extractArray(int nodeId, const char *name);

  void clear();
};
}  // namespace graph

}  // namespace sd

#endif  // LIBND4J_STASH_H