// 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 <limits>
#include <string>

#include "base/callback.h"
#include "base/thread_task_runner_handle.h"
#include "base/values.h"
#include "cc/debug/invalidation_benchmark.h"
#include "cc/debug/rasterize_and_record_benchmark.h"
#include "cc/debug/unittest_only_benchmark.h"
#include "cc/trees/layer_tree_host.h"
#include "cc/trees/layer_tree_host_impl.h"

namespace cc {

int MicroBenchmarkController::next_id_ = 1;

namespace {

scoped_ptr<MicroBenchmark> CreateBenchmark(
    const std::string& name,
    scoped_ptr<base::Value> value,
    const MicroBenchmark::DoneCallback& callback) {
  if (name == "invalidation_benchmark") {
    return make_scoped_ptr(new InvalidationBenchmark(value.Pass(), callback));
  } else if (name == "rasterize_and_record_benchmark") {
    return make_scoped_ptr(
        new RasterizeAndRecordBenchmark(value.Pass(), callback));
  } else if (name == "unittest_only_benchmark") {
    return make_scoped_ptr(new UnittestOnlyBenchmark(value.Pass(), callback));
  }
  return nullptr;
}

class IsDonePredicate {
 public:
  typedef const MicroBenchmark* argument_type;
  typedef bool result_type;

  result_type operator()(argument_type benchmark) const {
    return benchmark->IsDone();
  }
};

}  // namespace

MicroBenchmarkController::MicroBenchmarkController(LayerTreeHost* host)
    : host_(host),
      main_controller_task_runner_(base::ThreadTaskRunnerHandle::IsSet()
                                       ? base::ThreadTaskRunnerHandle::Get()
                                       : nullptr) {
  DCHECK(host_);
}

MicroBenchmarkController::~MicroBenchmarkController() {}

int MicroBenchmarkController::ScheduleRun(
    const std::string& micro_benchmark_name,
    scoped_ptr<base::Value> value,
    const MicroBenchmark::DoneCallback& callback) {
  scoped_ptr<MicroBenchmark> benchmark =
      CreateBenchmark(micro_benchmark_name, value.Pass(), callback);
  if (benchmark.get()) {
    int id = GetNextIdAndIncrement();
    benchmark->set_id(id);
    benchmarks_.push_back(benchmark.Pass());
    host_->SetNeedsCommit();
    return id;
  }
  return 0;
}

int MicroBenchmarkController::GetNextIdAndIncrement() {
  int id = next_id_++;
  // Wrap around to 1 if we overflow (very unlikely).
  if (next_id_ == std::numeric_limits<int>::max())
    next_id_ = 1;
  return id;
}

bool MicroBenchmarkController::SendMessage(int id,
                                           scoped_ptr<base::Value> value) {
  for (ScopedPtrVector<MicroBenchmark>::iterator it = benchmarks_.begin();
       it != benchmarks_.end();
       ++it) {
    if ((*it)->id() == id)
      return (*it)->ProcessMessage(value.Pass());
  }
  return false;
}

void MicroBenchmarkController::ScheduleImplBenchmarks(
    LayerTreeHostImpl* host_impl) {
  for (ScopedPtrVector<MicroBenchmark>::iterator it = benchmarks_.begin();
       it != benchmarks_.end();
       ++it) {
    scoped_ptr<MicroBenchmarkImpl> benchmark_impl;
    if (!(*it)->ProcessedForBenchmarkImpl()) {
      benchmark_impl = (*it)->GetBenchmarkImpl(main_controller_task_runner_);
    }

    if (benchmark_impl.get())
      host_impl->ScheduleMicroBenchmark(benchmark_impl.Pass());
  }
}

void MicroBenchmarkController::DidUpdateLayers() {
  for (ScopedPtrVector<MicroBenchmark>::iterator it = benchmarks_.begin();
       it != benchmarks_.end();
       ++it) {
    if (!(*it)->IsDone())
      (*it)->DidUpdateLayers(host_);
  }

  CleanUpFinishedBenchmarks();
}

void MicroBenchmarkController::CleanUpFinishedBenchmarks() {
  benchmarks_.erase(
      benchmarks_.partition(std::not1(IsDonePredicate())),
      benchmarks_.end());
}

}  // namespace cc