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

#ifndef FLUTTER_FML_TASK_RUNNER_H_
#define FLUTTER_FML_TASK_RUNNER_H_

#include "flutter/fml/closure.h"
#include "flutter/fml/macros.h"
#include "flutter/fml/memory/ref_counted.h"
#include "flutter/fml/memory/ref_ptr.h"
#include "flutter/fml/message_loop_task_queues.h"
#include "flutter/fml/time/time_point.h"

namespace fml {

class MessageLoopImpl;

class BasicTaskRunner {
 public:
  virtual void PostTask(const fml::closure& task) = 0;
};

class TaskRunner : public fml::RefCountedThreadSafe<TaskRunner>,
                   public BasicTaskRunner {
 public:
  virtual ~TaskRunner();

  virtual void PostTask(const fml::closure& task) override;

  virtual void PostTaskForTime(const fml::closure& task,
                               fml::TimePoint target_time);

  virtual void PostDelayedTask(const fml::closure& task, fml::TimeDelta delay);

  virtual bool RunsTasksOnCurrentThread();

  virtual TaskQueueId GetTaskQueueId();

  static void RunNowOrPostTask(fml::RefPtr<fml::TaskRunner> runner,
                               const fml::closure& task);

 protected:
  TaskRunner(fml::RefPtr<MessageLoopImpl> loop);

 private:
  fml::RefPtr<MessageLoopImpl> loop_;

  FML_FRIEND_MAKE_REF_COUNTED(TaskRunner);
  FML_FRIEND_REF_COUNTED_THREAD_SAFE(TaskRunner);
  FML_DISALLOW_COPY_AND_ASSIGN(TaskRunner);
};

}  // namespace fml

#endif  // FLUTTER_FML_TASK_RUNNER_H_