// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
//
// 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.

#pragma once

#include "fastdeploy/vision/common/processors/base.h"

namespace fastdeploy {
namespace vision {
class FASTDEPLOY_DECL Normalize : public Processor {
 public:
  Normalize(const std::vector<float>& mean, const std::vector<float>& std,
            bool is_scale = true,
            const std::vector<float>& min = std::vector<float>(),
            const std::vector<float>& max = std::vector<float>());
  bool ImplByOpenCV(Mat* mat);
#ifdef ENABLE_FLYCV
  bool ImplByFalconCV(Mat* mat);
#endif
  std::string Name() { return "Normalize"; }

  // While use normalize, it is more recommend not use this function
  // this function will need to compute result = ((mat / 255) - mean) / std
  // if we use the following method
  // ```
  // auto norm = Normalize(...)
  // norm(mat)
  // ```
  // There will be some precomputation in contruct function
  // and the `norm(mat)` only need to compute result = mat * alpha + beta
  // which will reduce lots of time
  static bool Run(Mat* mat, const std::vector<float>& mean,
                  const std::vector<float>& std, bool is_scale = true,
                  const std::vector<float>& min = std::vector<float>(),
                  const std::vector<float>& max = std::vector<float>(),
                  ProcLib lib = ProcLib::OPENCV);

  std::vector<float> GetAlpha() const {
    return alpha_;
  }
  std::vector<float> GetBeta() const {
    return beta_;
  }

 private:
  std::vector<float> alpha_;
  std::vector<float> beta_;
};
}  // namespace vision
}  // namespace fastdeploy