/* Copyright (c) 2021 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/cinn/cinn_launch_context.h"
#include "gtest/gtest.h"
#include "paddle/fluid/framework/ddim.h"
#include "paddle/fluid/framework/scope.h"

namespace paddle {
namespace operators {
namespace details {

using CinnShape = ::cinn::hlir::framework::Shape;

std::unique_ptr<CinnLaunchContext> CreateDefaultLaunchContext() {
  static std::once_flag initialized;
  static std::unordered_map<std::string, std::string> paddle2cinn_varmap;
  static std::shared_ptr<CinnScope> cinn_scope;
  std::call_once(initialized, [&paddle2cinn_varmap, &cinn_scope]() {
    auto& scope = cinn_scope;
    scope = std::make_shared<CinnScope>();

    scope->Var<CinnTensor>("cinn_var1");
    scope->GetTensor("cinn_var1")->Resize(CinnShape({3, 4}));
    scope->Var<CinnTensor>("cinn_var2");
    scope->GetTensor("cinn_var2")->Resize(CinnShape({6, 7, 8}));
    scope->Var<CinnTensor>("cinn_var3");
    scope->GetTensor("cinn_var3")->Resize(CinnShape({10, 16}));

    paddle2cinn_varmap = {
        {"var1", "cinn_var1"}, {"var3", "cinn_var3"}, {"var4", "cinn_var4"}};
  });

  return std::make_unique<CinnLaunchContext>(paddle2cinn_varmap, cinn_scope);
}

TEST(CinnLaunchContextTest, TestBasic) {
  auto launch_context = CreateDefaultLaunchContext();
  // test IsVariableUsed
  ASSERT_EQ(launch_context->IsVariableUsed("var1"), true);
  ASSERT_EQ(launch_context->IsVariableUsed("var4"), false);
  // test UpdateCapturedEnv
  platform::CPUPlace place;
  framework::Scope scope;
  ASSERT_NO_THROW(launch_context->UpdateCapturedEnv(scope, place));
  // test IsArgumentsInitialized
  ASSERT_FALSE(launch_context->IsArgumentsInitialized());
}

TEST(CinnLaunchContextTest, TestCheckTensorEquivalent) {
  platform::CPUPlace place;
  framework::Scope scope;
  auto launch_context = CreateDefaultLaunchContext();
  launch_context->UpdateCapturedEnv(scope, place);
  auto* tensor1 = scope.Var("var1")->GetMutable<LoDTensor>();

  // CheckTensorEquivalent: tensor dimension not equivalent
  tensor1->mutable_data<float>(framework::make_ddim({3, 5}), place);
  ASSERT_THROW(launch_context->AssignExternalVariable("var1"),
               paddle::platform::EnforceNotMet);
}

TEST(CinnLaunchContextTest, TestAssignVariablePreCondition) {
  platform::CPUPlace place;
  framework::Scope scope;
  auto launch_context = CreateDefaultLaunchContext();
  launch_context->UpdateCapturedEnv(scope, place);
  auto* tensor4 = scope.Var("var4")->GetMutable<LoDTensor>();

  // not used
  ASSERT_THROW(launch_context->AssignExternalVariable("var4"),
               paddle::platform::EnforceNotMet);
  // not found
  ASSERT_THROW(launch_context->AssignInternalVariable("cinn_var4"),
               paddle::platform::EnforceNotMet);
}

TEST(CinnLaunchContextTest, TestSetArgument) {
  platform::CPUPlace cpu_place;
  platform::Place place(cpu_place);
  framework::Scope scope;
  auto launch_context = CreateDefaultLaunchContext();
  launch_context->UpdateCapturedEnv(scope, place);

  // assign external variables
  auto* tensor1 = scope.Var("var1")->GetMutable<LoDTensor>();
  float* data1 =
      tensor1->mutable_data<float>(framework::make_ddim({3, 4}), place);
  data1[0] = 9.99f;
  data1[10] = 19.99f;
  ASSERT_NO_THROW(launch_context->AssignExternalVariable("var1"));

  auto* tensor3 = scope.Var("var3")->GetMutable<LoDTensor>();
  tensor3->mutable_data<float>(framework::make_ddim({10, 16}), place);
  ASSERT_NO_THROW(launch_context->AssignExternalVariable("var3"));

  // FinalizeArguments missed check
  ASSERT_THROW(launch_context->FinalizeArguments(),
               paddle::platform::EnforceNotMet);
  // test get internal variables
  auto internal_variable_names = launch_context->GetInternalVariableNames();
  ASSERT_EQ(internal_variable_names.size(), 1);
  EXPECT_EQ(*internal_variable_names.begin(), "cinn_var2");

  auto* tensor2 = scope.Var("var2")->GetMutable<LoDTensor>();
  tensor2->mutable_data<float>(framework::make_ddim({6, 7, 8}), place);
  ASSERT_NO_THROW(launch_context->AssignInternalVariable("cinn_var2"));

  // check argument is set correctly and alloc/free callbacks work well
  auto name2argument = launch_context->FinalizeArguments();
  ASSERT_EQ(name2argument.size(), 3);
  ASSERT_EQ(name2argument.count("cinn_var1"), 1);
  ASSERT_TRUE(launch_context->IsArgumentsInitialized());

  auto* cinn_buffer =
      static_cast<cinn_buffer_t*>(name2argument.at("cinn_var1"));
  ASSERT_EQ(cinn_buffer->memory, nullptr);
  cinn_buffer->external_malloc->operator()(nullptr, cinn_buffer);
  ASSERT_NE(cinn_buffer->memory, nullptr);
  ASSERT_EQ(cinn_buffer->num_elements(), 12);
  auto* shadow_data = reinterpret_cast<float*>(cinn_buffer->memory);
  EXPECT_FLOAT_EQ(shadow_data[0], 9.99f);
  EXPECT_FLOAT_EQ(shadow_data[10], 19.99f);
}

}  // namespace details
}  // namespace operators
}  // namespace paddle