// Copyright (c) 2018 Graphcore Ltd. All rights reserved.
#include <algorithm>
#include <map>
#include <memory>
#include <string>
#include <tuple>
#include <vector>
#include <popart/op/exp.hpp>
#include <popart/opmanager.hpp>

#include "popart/datatype.hpp"
#include "popart/names.hpp"
#include "popart/op.hpp"
#include "popart/op/elementwise.hpp"
#include "popart/operatoridentifier.hpp"
#include "popart/operators.hpp"
#include "popart/tensorinfo.hpp"

namespace popart {

std::vector<std::tuple<OperatorIdentifier, float>>
ExpOp::inplacePriorityDefault() const {
  return {{Onnx::CustomOperators::ExpInplace, 10}};
}

std::unique_ptr<Op>
ExpOp::getInplaceVariant(const OperatorIdentifier &operator_id) const {
  if (operator_id == Onnx::CustomOperators::ExpInplace) {
    return std::make_unique<ExpInplaceOp>(*this);
  }
  // catch remaining cases and throw an error
  return Op::getInplaceVariant(operator_id);
}

ExpInplaceOp::ExpInplaceOp(const ExpOp &exp_op)
    : ElementWiseInplaceUnaryOp(Onnx::CustomOperators::ExpInplace,
                                exp_op.getSettings()) {}

ExpInplaceOp::ExpInplaceOp(const Settings &settings)
    : ElementWiseInplaceUnaryOp(Onnx::CustomOperators::ExpInplace, settings) {}

std::unique_ptr<Op> ExpInplaceOp::clone() const {
  return std::make_unique<ExpInplaceOp>(*this);
}

ExpOp::ExpOp(const OperatorIdentifier &_opid, const Op::Settings &settings_)
    : ElementWiseUnaryOp(_opid, settings_) {}

std::unique_ptr<Op> ExpOp::clone() const {
  return std::make_unique<ExpOp>(*this);
}

std::vector<std::unique_ptr<Op>> ExpOp::getGradOps() {
  std::vector<std::unique_ptr<Op>> upops;
  upops.emplace_back(std::make_unique<ExpGradOp>(*this));
  return upops;
}

ExpGradOp::ExpGradOp(const ExpOp &fwdOp)
    : Op(Onnx::GradOperators::ExpGrad, fwdOp.getSettings()) {}

std::unique_ptr<Op> ExpGradOp::clone() const {
  return std::make_unique<ExpGradOp>(*this);
}

const std::vector<GradInOutMapper> &ExpGradOp::gradInputInfo() const {
  static const std::vector<GradInOutMapper> inInfo = {
      {getGradInIndex(), ExpOp::getOutIndex(), GradOpInType::GradOut},
      {getFwdOutInIndex(), ExpOp::getOutIndex(), GradOpInType::Out}};

  return inInfo;
}

const std::map<int, int> &ExpGradOp::gradOutToNonGradIn() const {
  static const std::map<int, int> outInfo = {
      {getOutIndex(), ExpOp::getInIndex()}};

  return outInfo;
}

void ExpGradOp::setup() { outInfo(getOutIndex()) = inInfo(getFwdOutInIndex()); }

namespace {

static OpDefinition::DataTypes T = {DataType::FLOAT16, DataType::FLOAT};

static OpDefinition expOpDef({OpDefinition::Inputs({{"input", T}}),
                              OpDefinition::Outputs({{"output", T}}),
                              OpDefinition::Attributes({})});

static OpCreator<ExpOp> expOpCreator(OpDefinitions({
    {Onnx::Operators::Exp_6, expOpDef},
}));
} // namespace

} // namespace popart