/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file asyncTaskSequence.h
 * @author drose
 * @date 2008-10-04
 */

#ifndef ASYNCTASKSEQUENCE_H
#define ASYNCTASKSEQUENCE_H

#include "pandabase.h"

#include "asyncTask.h"
#include "asyncTaskCollection.h"

class AsyncTaskManager;

/**
 * A special kind of task that serves as a list of tasks internally.  Each
 * task on the list is executed in sequence, one per epoch.
 *
 * This is similar to a Sequence interval, though it has some slightly
 * different abilities.  For instance, although you can't start at any
 * arbitrary point in the sequence, you can construct a task sequence whose
 * duration changes during playback.
 */
class EXPCL_PANDA_EVENT AsyncTaskSequence : public AsyncTask, public AsyncTaskCollection {
PUBLISHED:
  explicit AsyncTaskSequence(const std::string &name);
  virtual ~AsyncTaskSequence();
  ALLOC_DELETED_CHAIN(AsyncTaskSequence);

  INLINE void set_repeat_count(int repeat_count);
  INLINE int get_repeat_count() const;

  INLINE size_t get_current_task_index() const;

protected:
  virtual bool is_runnable();
  virtual DoneStatus do_task();
  virtual void upon_birth(AsyncTaskManager *manager);
  virtual void upon_death(AsyncTaskManager *manager, bool clean_exit);

private:
  void set_current_task(AsyncTask *task, bool clean_exit);

  int _repeat_count;
  size_t _task_index;
  PT(AsyncTask) _current_task;

public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    AsyncTask::init_type();
    register_type(_type_handle, "AsyncTaskSequence",
                  AsyncTask::get_class_type());
  }
  virtual TypeHandle get_type() const {
    return get_class_type();
  }
  virtual TypeHandle force_init_type() {init_type(); return get_class_type();}

private:
  static TypeHandle _type_handle;
};

#include "asyncTaskSequence.I"

#endif