/*
 * Copyright (c) 2020, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */

/*!\file
 * \brief This binary demonstrates how to build an executable with TensorFlow
 * Lite. A library for aomenc/aomdec is almost identical in structure,
 * except that "main" will not be present, and a header file will be added.
 */

#include <cstdio>
#include <memory>

#include "common/tf_lite_includes.h"

namespace {

/**
 * Model data. Steps to create:
 *
 * 1. Build your model like normal.
 * 2. Follow the steps at https://www.tensorflow.org/lite/convert/python_api
 *    to convert into a TF-lite model. Optionally quantize the model to make
 *    it smaller (see the Quantization section at
 *    https://www.tensorflow.org/lite/guide/get_started)
 * 3. Run `xxd -i model.tflite > model.cc` to make it a CC file.
 * 4. Change the declaration to be const.
 * 5. Either include directly or create .h/.cc files that expose the array.
 */
const unsigned char tf_lite_model_data[] = {
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};

/**
 * These lines were generated by building the binary
 * tensorflow/lite/tools/generate_op_registrations and running it with
 * the TF-Lite model as input. In order to build that binary, follow
 * these instructions:
 *
 * 1.) Check out a clean copy of tensorflow/ in a different directory. Pin to
 *     commit 18445b0e39b677a21c86b4cf3d2bcb823f27e3e2. Make sure you are
 *     in the root of the tensorflow/ directory.
 * 2.) Apply the following diff to
 *     tensorflow/lite/tools/gen_op_registration_main.cc:
   <pre>
153,155c153,155
<   std::string input_models;
<   std::string output_registration;
<   std::string tflite_path;
---
>   std::string input_model(argv[1]);
>   std::string output_registration(argv[2]);
>   std::string tflite_path("tensorflow/lite");
158,159d157
<   ParseFlagAndInit(&argc, argv, &input_models, &output_registration,
<                    &tflite_path, &namespace_flag, &for_micro);
163,171c161
<   if (!input_models.empty()) {
<     std::vector<std::string> models = absl::StrSplit(input_models, ',');
<     for (const std::string& input_model : models) {
<       AddOpsFromModel(input_model, &builtin_ops, &custom_ops);
<     }
<   }
<   for (int i = 1; i < argc; i++) {
<     AddOpsFromModel(argv[i], &builtin_ops, &custom_ops);
<   }
---
>   AddOpsFromModel(input_model, &builtin_ops, &custom_ops);
   </pre>
 * This diff fixes an issue with the current binary's flag parsing
 * library, which is failing silently.
 *
 * 3. Run "bazel build tensorflow/lite/tools/generate_op_registrations"
 * and then run:
   <pre>
 ./bazel-bin/tensorflow/lite/tools/generate_op_registrations \
    /path/to/model.tflite /path/to/output.cc
   </pre>
 * For appropriate paths to the input and output files.
 */
void RegisterSpecificOps(tflite::MutableOpResolver *resolver) {
  resolver->AddBuiltin(tflite::BuiltinOperator_FULLY_CONNECTED,
                       tflite::ops::builtin::Register_FULLY_CONNECTED(), 3, 3);
  resolver->AddBuiltin(tflite::BuiltinOperator_SOFTMAX,
                       tflite::ops::builtin::Register_SOFTMAX());
}

TfLiteDelegate *GetTfliteXnnpackDelegate(int num_threads) {
  TfLiteXNNPackDelegateOptions xnnpack_options =
      TfLiteXNNPackDelegateOptionsDefault();
  xnnpack_options.num_threads = num_threads;
  return TfLiteXNNPackDelegateCreate(&xnnpack_options);
}

}  // namespace

int main() {
  // Toy model that takes in four floats and returns two classification
  // probabilities.
  auto model = tflite::GetModel(tf_lite_model_data);
  // Build the interpreter.
  tflite::MutableOpResolver resolver;
  RegisterSpecificOps(&resolver);
  tflite::InterpreterBuilder builder(model, resolver);
  std::unique_ptr<tflite::Interpreter> interpreter;
  builder(&interpreter);

  std::unique_ptr<tflite::ErrorReporter> reporter(
      tflite::DefaultErrorReporter());

  if (interpreter->AllocateTensors() != kTfLiteOk) {
    reporter->Report("Failed at allocating tensors");
    return EXIT_FAILURE;
  }

  // Using single-thread as an example. Can be changed as required.
  TfLiteDelegate *xnnpack_delegate = GetTfliteXnnpackDelegate(1);
  if (interpreter->ModifyGraphWithDelegate(xnnpack_delegate) != kTfLiteOk) {
    reporter->Report("Failed at modifying graph with XNNPack delegate");
    return EXIT_FAILURE;
  }

  // Always uses (0, 1, 2, 3) as inputs.
  float *input = interpreter->typed_input_tensor<float>(0);
  for (int i = 0; i < 4; ++i) {
    input[i] = i;
  }
  auto status = interpreter->Invoke();
  if (status != kTfLiteOk) {
    reporter->Report("Failed at invoke");
    return EXIT_FAILURE;
  }
  float y0 = interpreter->typed_output_tensor<float>(0)[0];
  float y1 = interpreter->typed_output_tensor<float>(0)[1];
  printf("Sample classification probability: %f, %f\n", y0, y1);
  return EXIT_SUCCESS;
}