// Copyright (c) 2020 Mobvoi Inc (Binbin Zhang)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// 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.

#ifndef DECODER_SEARCH_INTERFACE_H_
#define DECODER_SEARCH_INTERFACE_H_

namespace wenet {

#include <vector>

enum SearchType {
  kPrefixBeamSearch = 0x00,
  kWfstBeamSearch = 0x01,
};

class SearchInterface {
 public:
  virtual ~SearchInterface() {}
  virtual void Search(const std::vector<std::vector<float>>& logp) = 0;
  virtual void Reset() = 0;
  virtual void FinalizeSearch() = 0;

  virtual SearchType Type() const = 0;
  // N-best inputs id
  virtual const std::vector<std::vector<int>>& Inputs() const = 0;
  // N-best outputs id
  virtual const std::vector<std::vector<int>>& Outputs() const = 0;
  // N-best likelihood
  virtual const std::vector<float>& Likelihood() const = 0;
  // N-best timestamp
  virtual const std::vector<std::vector<int>>& Times() const = 0;
};

}  // namespace wenet

#endif  // DECODER_SEARCH_INTERFACE_H_