//   Copyright (c) 2020 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 "paddle/fluid/operators/set_value_op.h"
#include <string>
#include "paddle/fluid/framework/op_version_registry.h"

namespace paddle {
namespace framework {
class InferShapeContext;
class OpDesc;
template <typename T>
class EmptyGradOpMaker;
}  // namespace framework
namespace imperative {
class OpBase;
}  // namespace imperative
namespace platform {
class CPUDeviceContext;
struct CPUPlace;
}  // namespace platform
}  // namespace paddle

namespace paddle {
namespace operators {

class SetValue : public framework::OperatorWithKernel {
 public:
  SetValue(const std::string &type, const framework::VariableNameMap &inputs,
           const framework::VariableNameMap &outputs,
           const framework::AttributeMap &attrs)
      : OperatorWithKernel(type, inputs, outputs, attrs) {}

  void InferShape(framework::InferShapeContext *ctx) const override {
    OP_INOUT_CHECK(ctx->HasInput("Input"), "Input", "Input", "SetValue");
    OP_INOUT_CHECK(ctx->HasOutput("Out"), "Output", "Out", "SetValue");
    auto in_dims = ctx->GetInputDim("Input");
    PADDLE_ENFORCE_LT(
        in_dims.size(), 7,
        platform::errors::InvalidArgument(
            "The rank of input should be less than 7, but received %d.",
            in_dims.size()));
  }

 protected:
  framework::OpKernelType GetExpectedKernelType(
      const framework::ExecutionContext &ctx) const override {
    return framework::OpKernelType(
        framework::proto::VarType::Type(ctx.Attr<int>("dtype")),
        ctx.GetPlace());
  }

  framework::OpKernelType GetKernelTypeForVar(
      const std::string &var_name, const Tensor &tensor,
      const framework::OpKernelType &expected_kernel_type) const override {
    if (var_name == "StartsTensorList" || var_name == "EndsTensorList" ||
        var_name == "StepsTensorList") {
      return expected_kernel_type;
    }
    return framework::OpKernelType(expected_kernel_type.data_type_,
                                   tensor.place(), tensor.layout());
  }
};

class SetValueMaker : public framework::OpProtoAndCheckerMaker {
 public:
  void Make() override {
    // Input
    AddInput("Input", "(Tensor) Input tensor of set_value operator.");
    AddInput("ValueTensor", "(Tensor) Value tensor of set_value operator.")
        .AsDispensable();
    AddInput("StartsTensorList",
             "(vector<Tensor<int32>>, optional) If provided, set_value will "
             "use this. The shape of the tensor in vector must be [1]."
             "It has higher priority compare with attr(starts).")
        .AsDuplicable()
        .AsDispensable();
    AddInput("EndsTensorList",
             "(vector<Tensor<int32>>, optional) If provided, set_value will "
             "use this. The shape of the tensor in vector must BE [1]."
             "It has higher priority compare with attr(ends).")
        .AsDuplicable()
        .AsDispensable();

    AddInput("StepsTensorList",
             "(vector<Tensor<int32>>, optional) If provided, set_value will "
             "use this. The shape of the tensor in vector must BE [1]."
             "It has higher priority compare with attr(steps).")
        .AsDuplicable()
        .AsDispensable();

    // Output
    AddOutput("Out",
              "(Tensor) Output tensor of set_value operator. The output is the "
              "same Tensor as input");

    // Attr
    AddAttr<int>("dtype", "data type of input.")
        .InEnum(
            {framework::proto::VarType::BOOL, framework::proto::VarType::INT32,
             framework::proto::VarType::INT64, framework::proto::VarType::FP32,
             framework::proto::VarType::FP64})
        .SetDefault(framework::proto::VarType::FP32);
    AddAttr<std::vector<int64_t>>(
        "axes", "(list<int64_t>) Axes that `starts` and `ends` apply to.");
    AddAttr<std::vector<int64_t>>(
        "starts",
        "(list<int64_t>) Starting indices of corresponding axis in `axes`.")
        .SetDefault({});
    AddAttr<std::vector<int64_t>>(
        "ends",
        "(list<int64_t>) Ending indices of corresponding axis in `axes`.")
        .SetDefault({});
    AddAttr<std::vector<int64_t>>(
        "steps", "(list<int64_t>) Stride step from the start to the end.")
        .SetDefault({});

    AddAttr<std::vector<int>>("bool_values", "Store the bool values.")
        .SetDefault({});
    AddAttr<std::vector<float>>("fp32_values", "Store the float32 values.")
        .SetDefault({});
    AddAttr<std::vector<int>>("int32_values", "Store the int32 values.")
        .SetDefault({});
    AddAttr<std::vector<int64_t>>("int64_values", "Store the int64 values.")
        .SetDefault({});
    AddAttr<std::vector<double>>("fp64_values", "Store the float64 values.")
        .SetDefault({});

    AddAttr<std::vector<int64_t>>("shape", "(vector<int64_t>) Shape of values.")
        .SetDefault({});
    AddComment(R"DOC(SetValue operator.
Assignment to a Tensor in static mode.
)DOC");
  }
};
}  // namespace operators
}  // namespace paddle

namespace ops = paddle::operators;

REGISTER_OPERATOR(
    set_value, ops::SetValue, ops::SetValueMaker,
    paddle::framework::EmptyGradOpMaker<paddle::framework::OpDesc>,
    paddle::framework::EmptyGradOpMaker<paddle::imperative::OpBase>);

REGISTER_OP_CPU_KERNEL(
    set_value, ops::SetValueKernel<paddle::platform::CPUDeviceContext, int>,
    ops::SetValueKernel<paddle::platform::CPUDeviceContext, int64_t>,
    ops::SetValueKernel<paddle::platform::CPUDeviceContext, float>,
    ops::SetValueKernel<paddle::platform::CPUDeviceContext, double>,
    ops::SetValueKernel<paddle::platform::CPUDeviceContext, bool>);

REGISTER_OP_VERSION(set_value)
    .AddCheckpoint(
        R"ROC(
Upgrade set_value, add 3 inputs [StartsTensorList, EndsTensorList, StepsTensorList] and 1 attribute [steps].
              )ROC",
        paddle::framework::compatible::OpVersionDesc()
            .NewInput("StartsTensorList",
                      "If provided, set_value will use this.The shape of the "
                      "tensor in vector must be [1]. It has higher priority "
                      "compare with attr(starts).")
            .NewInput("EndsTensorList",
                      "If provided, set_value will use this.The shape of the "
                      "tensor in vector must be [1]. It has higher priority "
                      "compare with attr(ends).")
            .NewInput("StepsTensorList",
                      "If provided, set_value will use this.The shape of the "
                      "tensor in vector must be [1]. It has higher priority "
                      "compare with attr(steps).")
            .ModifyAttr("starts",
                        "Starting indices of corresponding axis in `axes`.",
                        std::vector<int64_t>{})
            .ModifyAttr("ends",
                        "Ending indices of corresponding axis in `axes`.",
                        std::vector<int64_t>{})
            .NewAttr("steps", "Stride step from the start to the end.",
                     std::vector<int64_t>{}));
