// Copyright (c) Microsoft Corporation. All rights reserved.
// Copyright (c) 2020, NXP Semiconductor, Inc. All rights reserved.
// Licensed under the MIT License.

#include "core/providers/acl/tensor/concat.h"
#include "core/providers/common.h"
#include "core/framework/TensorSeq.h"
#include "arm_compute/core/utils/misc/ShapeCalculator.h"

#include "core/providers/acl/acl_common.h"
#include "core/providers/acl/acl_fwd.h"

#define PREF_DIM 4

namespace onnxruntime {
namespace acl {

template <typename T>
Status Concat<T>::Compute(OpKernelContext* ctx) const {
  if (axis_ > 3) {
    LOGS_DEFAULT(WARNING) << "ArmNN does not have support for tensors with 4 or more dimensions; defaulting to cpu implementation";
    return onnxruntime::Concat::Compute(ctx);
  }

  // Number of input tensors to concatenate
  auto input_count = Node().InputArgCount().front();

  // Hold pointers to the input tensors to be used in the PrepareForCompute() step
  std::vector<const Tensor*> input_tensors;
  input_tensors.reserve(input_count);
  for (int i = 0; i < input_count; ++i) {
    input_tensors.push_back(ctx->Input<Tensor>(i));
  }

  auto output_dims = input_tensors[0]->Shape().AsShapeVector();

  // 'Concat' mode
  if (!is_stack_) {
    // While concating, the rank of the output is the same as the input rank(s)

    // Calculate the size of the concatenated axis
    size_t concat_axis_size = 0;
    for (int64_t index = 0; index < input_count; index++) {
      concat_axis_size += input_tensors[index]->Shape()[static_cast<int>(axis_)];
    }

    output_dims[axis_] = concat_axis_size;
  } else {  // 'Stack' mode
    // While stacking, the rank of the output is one more than the input rank(s).
    // Stacking may be thought of as adding an unit dimension (of value 1) in the input tensors,
    // and concatenating them on thie new axis.
    // The value in the corresponding axis of the output will be the number of inputs that are being stacked.
    output_dims.insert(output_dims.begin() + axis_, static_cast<int64_t>(input_count));
  }

  if (output_dims.size() > 4 || axis_ > 3) {
    LOGS_DEFAULT(WARNING) << "ArmNN does not have support for tensors with 4 or more dimensions; defaulting to cpu implementation";
    return onnxruntime::Concat::Compute(ctx);
  }

  TensorShape output_shape(output_dims);
  Tensor* Y = ctx->Output(0, output_shape);

  LOGS_DEFAULT(VERBOSE) << "Concat ACL:";

  arm_compute::Tensor output;
  std::vector<arm_compute::ITensor*> inputs_vector;
  for (int i = 0; i < input_count; i++) {
    arm_compute::Tensor* input = new arm_compute::Tensor();
    auto X = input_tensors[i];
    LOGS_DEFAULT(VERBOSE) << "X[" << i << "]: " << X->Shape().ToString().c_str();
    input->allocator()->init(arm_compute::TensorInfo(ACLTensorShape(X->Shape(), PREF_DIM), arm_compute::Format::F32));

    inputs_vector.push_back(input);
  }

  arm_compute::NEConcatenateLayer layer;
  layer.configure(inputs_vector, &output, 3 - axis_);

  LOGS_DEFAULT(VERBOSE) << "axis: " << axis_;
  LOGS_DEFAULT(VERBOSE) << std::endl;

  for (int i = 0; i < input_count; i++) {
    auto X = input_tensors[i];
    const T* x_data = X->Data<T>();
    arm_compute::Tensor* in = static_cast<arm_compute::Tensor*>(inputs_vector[i]);

    if (X->Shape().Size() != 0 && in->info()->has_padding()) {
      in->allocator()->allocate();
      importDataToTensor<T>(in, x_data);
    } else {
      ACLImportMemory(in->allocator(), (void*)x_data, X->Shape().Size() * 4);
    }
  }

  T* y_data = Y->MutableData<T>();

  if (Y->Shape().Size() != 0 && output.info()->has_padding()) {
    output.allocator()->allocate();
  } else {
    ACLImportMemory(output.allocator(), (void*)y_data, Y->Shape().Size() * 4);
  }

  layer.run();

  if (Y->Shape().Size() != 0 && output.info()->has_padding()) {
    importDataFromTensor<T>(&output, y_data);
  }

  return Status::OK();
}

ONNX_OPERATOR_VERSIONED_KERNEL_EX(
    Concat,
    kOnnxDomain,
    4, 10,
    kAclExecutionProvider,
    KernelDefBuilder().TypeConstraint("T", DataTypeImpl::GetTensorType<float>()),
    Concat<float>);

ONNX_OPERATOR_KERNEL_EX(
    Concat,
    kOnnxDomain,
    11,
    kAclExecutionProvider,
    KernelDefBuilder().TypeConstraint("T", DataTypeImpl::GetTensorType<float>()),
    Concat<float>);

}  // namespace acl
}  // namespace onnxruntime
