// 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.

#include "fastdeploy/vision/ocr/ppocr/recognizer.h"
#include "fastdeploy/utils/perf.h"
#include "fastdeploy/vision/ocr/ppocr/utils/ocr_utils.h"

namespace fastdeploy {
namespace vision {
namespace ocr {

Recognizer::Recognizer() {}

Recognizer::Recognizer(const std::string& model_file,
                       const std::string& params_file,
                       const std::string& label_path,
                       const RuntimeOption& custom_option,
                       const ModelFormat& model_format):postprocessor_(label_path) {
  if (model_format == ModelFormat::ONNX) {
    valid_cpu_backends = {Backend::ORT,
                          Backend::OPENVINO};  
    valid_gpu_backends = {Backend::ORT, Backend::TRT};  
  } else {
    valid_cpu_backends = {Backend::PDINFER, Backend::ORT, Backend::OPENVINO, Backend::LITE};
    valid_gpu_backends = {Backend::PDINFER, Backend::ORT, Backend::TRT};
    valid_ascend_backends = {Backend::LITE}; 
  }

  runtime_option = custom_option;
  runtime_option.model_format = model_format;
  runtime_option.model_file = model_file;
  runtime_option.params_file = params_file;
  initialized = Initialize();
}

// Init
bool Recognizer::Initialize() {
  if (!InitRuntime()) {
    FDERROR << "Failed to initialize fastdeploy backend." << std::endl;
    return false;
  }

  return true;
}

bool Recognizer::Predict(const cv::Mat& img, std::string* text, float* rec_score) {
  std::vector<std::string> texts(1);
  std::vector<float> rec_scores(1);
  bool success = BatchPredict({img}, &texts, &rec_scores);
  if (!success) {
    return success;
  }
  *text = std::move(texts[0]);
  *rec_score = rec_scores[0];
  return true;
}

bool Recognizer::BatchPredict(const std::vector<cv::Mat>& images,
                              std::vector<std::string>* texts, std::vector<float>* rec_scores) {
  return BatchPredict(images, texts, rec_scores, 0, images.size(), {});
}

bool Recognizer::BatchPredict(const std::vector<cv::Mat>& images,
                              std::vector<std::string>* texts, std::vector<float>* rec_scores,
                              size_t start_index, size_t end_index, const std::vector<int>& indices) {
  size_t total_size = images.size();
  if (indices.size() != 0 && indices.size() != total_size) {
    FDERROR << "indices.size() should be 0 or images.size()." << std::endl;
    return false;
  }
  std::vector<FDMat> fd_images = WrapMat(images);
  if (!preprocessor_.Run(&fd_images, &reused_input_tensors_, start_index, end_index, indices)) {
    FDERROR << "Failed to preprocess the input image." << std::endl;
    return false;
  }

  reused_input_tensors_[0].name = InputInfoOfRuntime(0).name;
  if (!Infer(reused_input_tensors_, &reused_output_tensors_)) {
    FDERROR << "Failed to inference by runtime." << std::endl;
    return false;
  }

  if (!postprocessor_.Run(reused_output_tensors_, texts, rec_scores, start_index, total_size, indices)) {
    FDERROR << "Failed to postprocess the inference cls_results by runtime." << std::endl;
    return false;
  }
  return true;
}

}  // namesapce ocr
}  // namespace vision
}  // namespace fastdeploy