// Copyright (c) ONNX Project Contributors
//
// SPDX-License-Identifier: Apache-2.0

// Adapter for Upsample in default domain from version 9 to 8

#pragma once

#include <memory>
#include <string>
#include <utility>
#include <vector>

#include "onnx/defs/tensor_proto_util.h"
#include "onnx/defs/tensor_util.h"
#include "onnx/version_converter/adapters/adapter.h"

namespace ONNX_NAMESPACE::version_conversion {

struct Upsample_9_8 final : public Adapter {
  explicit Upsample_9_8() : Adapter("Upsample", OpSetID(9), OpSetID(8)) {}

  void adapt_upsample_9_8(const std::shared_ptr<Graph>& graph, Node* node) const {
    const ArrayRef<Value*>& inputs = node->inputs();
    const std::vector<Tensor>& initializers = graph->initializers();

    ONNX_ASSERTM(inputs.size() == 2, "Upsample in opset 9 needs to have 2 inputs.")
    // Safe to access inputs[1] after assertion above
    std::string scale_input_name = inputs[1]->uniqueName();

    for (const auto& initializer : initializers) {
      if (initializer.name() == inputs[1]->uniqueName()) {
        std::vector<float> value = ParseData<float>(&initializer);
        std::vector<double> d_values;
        d_values.reserve(value.size());
        for (float j : value) {
          d_values.push_back(static_cast<double>(j));
        }
        node->fs_(kscales, std::move(d_values));

        node->removeInput(1);
        graph->eraseInitializer(initializer.name());
        for (size_t j = 0; j < graph->inputs().size(); j++) {
          if (graph->inputs()[j]->uniqueName() == scale_input_name) {
            graph->eraseInput(j);
            break;
          }
        }
        return;
      }
    }

    for (Node* op : graph->nodes()) {
      if (op->kind() == kConstant && !op->outputs().empty() && op->outputs()[0]->uniqueName() == scale_input_name) {
        std::vector<float> value = ParseData<float>(&op->t(kvalue));
        std::vector<double> d_values;
        d_values.reserve(value.size());
        for (float j : value) {
          d_values.push_back(static_cast<double>(j));
        }
        node->fs_(kscales, std::move(d_values));
        node->removeInput(1);
        op->destroy();
        return;
      }
    }

    ONNX_ASSERTM(false, "Unsupported conversion due to unavailable input: scale")
  }

  Node* adapt(std::shared_ptr<Graph> graph, Node* node) const override {
    adapt_upsample_9_8(graph, node);
    return node;
  }
};

} // namespace ONNX_NAMESPACE::version_conversion