// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/debug/micro_benchmark_controller.h"

#include <memory>

#include "base/callback.h"
#include "base/memory/ptr_util.h"
#include "base/run_loop.h"
#include "cc/animation/animation_host.h"
#include "cc/debug/micro_benchmark.h"
#include "cc/layers/layer.h"
#include "cc/test/fake_impl_task_runner_provider.h"
#include "cc/test/fake_layer_tree_host.h"
#include "cc/test/fake_layer_tree_host_impl.h"
#include "cc/test/fake_proxy.h"
#include "cc/test/test_task_graph_runner.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace cc {
namespace {

class MicroBenchmarkControllerTest : public testing::Test {
 public:
  void SetUp() override {
    impl_task_runner_provider_ =
        base::WrapUnique(new FakeImplTaskRunnerProvider);
    layer_tree_host_impl_ = base::MakeUnique<FakeLayerTreeHostImpl>(
        impl_task_runner_provider_.get(), &task_graph_runner_);

    animation_host_ = AnimationHost::CreateForTesting(ThreadInstance::MAIN);
    layer_tree_host_ = FakeLayerTreeHost::Create(
        &layer_tree_host_client_, &task_graph_runner_, animation_host_.get());
    layer_tree_host_->SetRootLayer(Layer::Create());
    layer_tree_host_->InitializeForTesting(
        TaskRunnerProvider::Create(nullptr, nullptr),
        std::unique_ptr<Proxy>(new FakeProxy));
  }

  void TearDown() override {
    layer_tree_host_impl_ = nullptr;
    layer_tree_host_ = nullptr;
    impl_task_runner_provider_ = nullptr;
    animation_host_ = nullptr;
  }

  FakeLayerTreeHostClient layer_tree_host_client_;
  TestTaskGraphRunner task_graph_runner_;
  std::unique_ptr<AnimationHost> animation_host_;
  std::unique_ptr<FakeLayerTreeHost> layer_tree_host_;
  std::unique_ptr<FakeLayerTreeHostImpl> layer_tree_host_impl_;
  std::unique_ptr<FakeImplTaskRunnerProvider> impl_task_runner_provider_;
};

void Noop(std::unique_ptr<base::Value> value) {}

void IncrementCallCount(int* count, std::unique_ptr<base::Value> value) {
  ++(*count);
}

TEST_F(MicroBenchmarkControllerTest, ScheduleFail) {
  int id = layer_tree_host_->ScheduleMicroBenchmark(
      "non_existant_benchmark", nullptr, base::Bind(&Noop));
  EXPECT_EQ(id, 0);
}

TEST_F(MicroBenchmarkControllerTest, CommitScheduled) {
  EXPECT_FALSE(layer_tree_host_->needs_commit());
  int id = layer_tree_host_->ScheduleMicroBenchmark(
      "unittest_only_benchmark", nullptr, base::Bind(&Noop));
  EXPECT_GT(id, 0);
  EXPECT_TRUE(layer_tree_host_->needs_commit());
}

TEST_F(MicroBenchmarkControllerTest, BenchmarkRan) {
  int run_count = 0;
  int id = layer_tree_host_->ScheduleMicroBenchmark(
      "unittest_only_benchmark",
      nullptr,
      base::Bind(&IncrementCallCount, base::Unretained(&run_count)));
  EXPECT_GT(id, 0);

  layer_tree_host_->UpdateLayers();

  EXPECT_EQ(1, run_count);
}

TEST_F(MicroBenchmarkControllerTest, MultipleBenchmarkRan) {
  int run_count = 0;
  int id = layer_tree_host_->ScheduleMicroBenchmark(
      "unittest_only_benchmark",
      nullptr,
      base::Bind(&IncrementCallCount, base::Unretained(&run_count)));
  EXPECT_GT(id, 0);
  id = layer_tree_host_->ScheduleMicroBenchmark(
      "unittest_only_benchmark",
      nullptr,
      base::Bind(&IncrementCallCount, base::Unretained(&run_count)));
  EXPECT_GT(id, 0);

  layer_tree_host_->UpdateLayers();

  EXPECT_EQ(2, run_count);

  id = layer_tree_host_->ScheduleMicroBenchmark(
      "unittest_only_benchmark",
      nullptr,
      base::Bind(&IncrementCallCount, base::Unretained(&run_count)));
  EXPECT_GT(id, 0);
  id = layer_tree_host_->ScheduleMicroBenchmark(
      "unittest_only_benchmark",
      nullptr,
      base::Bind(&IncrementCallCount, base::Unretained(&run_count)));
  EXPECT_GT(id, 0);

  layer_tree_host_->UpdateLayers();
  EXPECT_EQ(4, run_count);

  layer_tree_host_->UpdateLayers();
  EXPECT_EQ(4, run_count);
}

TEST_F(MicroBenchmarkControllerTest, BenchmarkImplRan) {
  int run_count = 0;
  std::unique_ptr<base::DictionaryValue> settings(new base::DictionaryValue);
  settings->SetBoolean("run_benchmark_impl", true);

  // Schedule a main thread benchmark.
  int id = layer_tree_host_->ScheduleMicroBenchmark(
      "unittest_only_benchmark", std::move(settings),
      base::Bind(&IncrementCallCount, base::Unretained(&run_count)));
  EXPECT_GT(id, 0);

  // Schedule impl benchmarks. In production code, this is run in commit.
  layer_tree_host_->GetMicroBenchmarkController()->ScheduleImplBenchmarks(
      layer_tree_host_impl_.get());

  // Now complete the commit (as if on the impl thread).
  layer_tree_host_impl_->CommitComplete();

  // Make sure all posted messages run.
  base::RunLoop().RunUntilIdle();

  EXPECT_EQ(1, run_count);
}

TEST_F(MicroBenchmarkControllerTest, SendMessage) {
  // Send valid message to invalid benchmark (id = 0)
  std::unique_ptr<base::DictionaryValue> message(new base::DictionaryValue);
  message->SetBoolean("can_handle", true);
  bool message_handled =
      layer_tree_host_->SendMessageToMicroBenchmark(0, std::move(message));
  EXPECT_FALSE(message_handled);

  // Schedule a benchmark
  int run_count = 0;
  int id = layer_tree_host_->ScheduleMicroBenchmark(
      "unittest_only_benchmark",
      nullptr,
      base::Bind(&IncrementCallCount, base::Unretained(&run_count)));
  EXPECT_GT(id, 0);

  // Send valid message to valid benchmark
  message = base::WrapUnique(new base::DictionaryValue);
  message->SetBoolean("can_handle", true);
  message_handled =
      layer_tree_host_->SendMessageToMicroBenchmark(id, std::move(message));
  EXPECT_TRUE(message_handled);

  // Send invalid message to valid benchmark
  message = base::WrapUnique(new base::DictionaryValue);
  message->SetBoolean("can_handle", false);
  message_handled =
      layer_tree_host_->SendMessageToMicroBenchmark(id, std::move(message));
  EXPECT_FALSE(message_handled);
}

}  // namespace
}  // namespace cc