// Copyright (c) 2018 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.

/*
 * This file defines the class Argument, which is the input and output of the
 * analysis module. All the fields that needed either by Passes or PassManagers
 * are contained in Argument.
 *
 * TODO(Superjomn) Find some way better to contain the fields when it grow too
 * big.
 */

#pragma once

#include <string>
#include <vector>
#include "paddle/fluid/framework/ir/graph.h"
#include "paddle/fluid/framework/program_desc.h"
#include "paddle/fluid/framework/scope.h"
#include "paddle/fluid/platform/variant.h"

namespace paddle {
namespace inference {
namespace analysis {
using framework::ir::Graph;

/*
 * The argument definition of both Pass and PassManagers.
 *
 * All the fields should be registered here for clearness.
 */
struct Argument {
  Argument() = default;
  explicit Argument(const std::string& model_dir) { SetModelDir(model_dir); }

  using unique_ptr_t = std::unique_ptr<void, std::function<void(void*)>>;
  using fusion_statis_t = std::unordered_map<std::string, int>;

  bool Has(const std::string& key) const { return valid_fields_.count(key); }

#define DECL_ARGUMENT_FIELD(field__, Field, type__) \
 public:                                            \
  type__& field__() {                               \
    PADDLE_ENFORCE(Has(#field__));                  \
    return field__##_;                              \
  }                                                 \
  void Set##Field(const type__& x) {                \
    field__##_ = x;                                 \
    valid_fields_.insert(#field__);                 \
  }                                                 \
  DECL_ARGUMENT_FIELD_VALID(field__);               \
  type__* field__##_ptr() { return &field__##_; }   \
                                                    \
 private:                                           \
  type__ field__##_;

#define DECL_ARGUMENT_FIELD_VALID(field__) \
  bool field__##_valid() { return Has(#field__); }

#define DECL_ARGUMENT_UNIQUE_FIELD(field__, Field, type__)                \
 public:                                                                  \
  type__& field__() {                                                     \
    PADDLE_ENFORCE_NOT_NULL(field__##_);                                  \
    PADDLE_ENFORCE(Has(#field__));                                        \
    return *static_cast<type__*>(field__##_.get());                       \
  }                                                                       \
  void Set##Field(type__* x) {                                            \
    field__##_ =                                                          \
        unique_ptr_t(x, [](void* x) { delete static_cast<type__*>(x); }); \
    valid_fields_.insert(#field__);                                       \
  }                                                                       \
  void Set##Field##NotOwned(type__* x) {                                  \
    valid_fields_.insert(#field__);                                       \
    field__##_ = unique_ptr_t(x, [](void* x) {});                         \
  }                                                                       \
  DECL_ARGUMENT_FIELD_VALID(field__);                                     \
  type__* field__##_ptr() {                                               \
    PADDLE_ENFORCE(Has(#field__));                                        \
    return static_cast<type__*>(field__##_.get());                        \
  }                                                                       \
  type__* Release##Field() {                                              \
    PADDLE_ENFORCE(Has(#field__));                                        \
    valid_fields_.erase(#field__);                                        \
    return static_cast<type__*>(field__##_.release());                    \
  }                                                                       \
                                                                          \
 private:                                                                 \
  unique_ptr_t field__##_;

  // Model path
  DECL_ARGUMENT_FIELD(model_dir, ModelDir, std::string);
  // Model specified with program and parameters files.
  DECL_ARGUMENT_FIELD(model_program_path, ModelProgramPath, std::string);
  DECL_ARGUMENT_FIELD(model_params_path, ModelParamsPath, std::string);

  // The overall graph to work on.
  DECL_ARGUMENT_UNIQUE_FIELD(main_graph, MainGraph, framework::ir::Graph);
  // The overall Scope to work on.
  DECL_ARGUMENT_UNIQUE_FIELD(scope, Scope, framework::Scope);

  DECL_ARGUMENT_UNIQUE_FIELD(main_program, MainProgram, framework::ProgramDesc);

  // The ir passes to perform in analysis phase.
  DECL_ARGUMENT_FIELD(ir_analysis_passes, IrAnalysisPasses,
                      std::vector<std::string>);

  DECL_ARGUMENT_FIELD(use_gpu, UseGPU, bool);
  DECL_ARGUMENT_FIELD(gpu_device_id, GPUDeviceId, int);
  DECL_ARGUMENT_FIELD(use_tensorrt, UseTensorRT, bool);
  DECL_ARGUMENT_FIELD(tensorrt_node_teller, TensorRtNodeTeller,
                      std::function<bool(const framework::ir::Node*)>);
  DECL_ARGUMENT_FIELD(tensorrt_max_batch_size, TensorRtMaxBatchSize, int);
  DECL_ARGUMENT_FIELD(tensorrt_workspace_size, TensorRtWorkspaceSize, int);

  // The program transformed by IR analysis phase.
  DECL_ARGUMENT_UNIQUE_FIELD(ir_analyzed_program, IrAnalyzedProgram,
                             framework::proto::ProgramDesc);

  DECL_ARGUMENT_FIELD(fusion_statis, FusionStatis, fusion_statis_t);

 private:
  std::unordered_set<std::string> valid_fields_;
};

#define ARGUMENT_CHECK_FIELD(argument__, fieldname__) \
  PADDLE_ENFORCE(argument__->Has(#fieldname__),       \
                 "the argument field [%s] should be set", #fieldname__);

}  // namespace analysis
}  // namespace inference
}  // namespace paddle
