// Copyright (c) 2019 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 "lite/kernels/npu/bridges/graph.h"
#include "lite/kernels/npu/bridges/registry.h"
#include "lite/kernels/npu/bridges/utility.h"

namespace paddle {
namespace lite {
namespace subgraph {
namespace npu {

int InterpolateConverter(void* ctx, OpLite* op) {
  CHECK(ctx != nullptr);
  CHECK(op != nullptr);
  auto graph = static_cast<Graph*>(ctx);
  auto op_info = op->op_info();
  auto op_type = op_info->Type();
  auto scope = op->scope();
  VLOG(3) << "[NPU] Converting " + op_type + "...";

  // Get input, output and attributes from lite op
  auto x_var_name = op_info->Input("X").front();
  auto x = scope->FindVar(x_var_name)->GetMutable<Tensor>();
  auto x_dims = x->dims();
  auto x_h = x_dims[2];
  auto x_w = x_dims[3];
  CHECK_EQ(x_dims.size(), 4);
  auto out_var_name = op_info->Output("Out").front();
  auto scale = op_info->GetAttr<float>("scale");
  auto out_w = op_info->GetAttr<int>("out_w");
  auto out_h = op_info->GetAttr<int>("out_h");
  auto align_corners = op_info->GetAttr<bool>("align_corners");
  int align_mode = op_info->GetAttr<int>("align_mode");
  auto interp_method = op_info->GetAttr<std::string>("interp_method");
  CHECK(!(align_mode == 0 && !align_corners)) << "[NPU] align_mode = 0 && "
                                                 "align_corners = false isn't "
                                                 "supported in HiAI DDK";

  // Priority: OutSize > scale > out_h/out_w
  if (scale > 0) {
    out_h = static_cast<int>(x_h * scale);
    out_w = static_cast<int>(x_w * scale);
    out_h = out_h > 0 ? out_h : -1;
    out_w = out_w > 0 ? out_w : -1;
  }

  // Update out_h and out_w if has OutSize
  std::shared_ptr<ge::Operator> out_size_node = nullptr;
  if (HasInputArg(op_info, scope, "OutSize")) {
    auto out_size_var_name = op_info->Input("OutSize").front();
    if (graph->HasNode(out_size_var_name)) {
      out_size_node = graph->GetNode(out_size_var_name);
    } else {
      auto out_size = scope->FindVar(out_size_var_name)->GetMutable<Tensor>();
      CHECK_EQ(out_size->numel(), 2);
      auto out_size_data = out_size->mutable_data<int>();
      // Update out_h and out_w if has OutSize
      out_h = out_size_data[0];
      out_w = out_size_data[1];
    }
  }
  if (out_size_node == nullptr) {
    if (interp_method == "bilinear") {
      const float largest_multiple = 7.0f;
      float multiple = static_cast<float>(x_h * x_w) / (out_h * out_w);
      CHECK_LT(multiple, largest_multiple)
          << "[NPU] multiple=(ih*iw)/(oh*ow)=" << multiple
          << " is too large, should not exceed " << largest_multiple
          << " in HiAI DDK";
    }
    out_size_node = graph->AddNode(out_var_name + "/out_size",
                                   std::vector<int>({out_h, out_w}));
  }

  if (interp_method == "bilinear") {
    auto bilinear_interp_node =
        graph->AddNode<ge::op::ResizeBilinear>(out_var_name);
    bilinear_interp_node->set_input_x(*graph->GetNode(x_var_name));
    bilinear_interp_node->set_input_size(*out_size_node);
    bilinear_interp_node->set_attr_align_corners(align_corners);
  } else if (interp_method == "nearest") {
    auto nearest_interp_node =
        graph->AddNode<ge::op::ResizeNearestNeighbor>(out_var_name);
    nearest_interp_node->set_input_image(*graph->GetNode(x_var_name));
    nearest_interp_node->set_input_size(*out_size_node);
    nearest_interp_node->set_attr_align_corners(align_corners);
  } else {
    LOG(WARNING) << "[NPU] Unsupported interpolate method: " << interp_method;
    return FAILED;
  }
  return REBUILD_WHEN_SHAPE_CHANGED;
}

}  // namespace npu
}  // namespace subgraph
}  // namespace lite
}  // namespace paddle

REGISTER_SUBGRAPH_BRIDGE(NPU,
                         bilinear_interp,
                         paddle::lite::subgraph::npu::InterpolateConverter);
REGISTER_SUBGRAPH_BRIDGE(NPU,
                         nearest_interp,
                         paddle::lite::subgraph::npu::InterpolateConverter);