/*
 * Software License Agreement (BSD License)
 *
 * Point Cloud Library (PCL) - www.pointclouds.org
 * Copyright (c) 2012-, Open Perception, Inc.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials provided
 *    with the distribution.
 *  * Neither the name of the copyright holder(s) nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <pcl/common/common.h>
#include <pcl/common/pcl_filesystem.h>
#include <pcl/common/time.h>
#include <pcl/registration/transformation_estimation_svd.h>
#include <pcl/visualization/pcl_visualizer.h>
#include <pcl/visualization/point_cloud_handlers.h>
#include <pcl/point_cloud.h>
#include <pcl/point_types.h>

#include <QMainWindow>
#include <QMutex>
#include <QTimer>

#include <ctime>
#include <iostream>

#define CURRENT_VERSION 0.2

// Useful macros
// clang-format off
#define FPS_CALC(_WHAT_)                                                               \
  do {                                                                                 \
    static unsigned count = 0;                                                         \
    static double last = pcl::getTime();                                               \
    double now = pcl::getTime();                                                       \
    ++count;                                                                           \
    if (now - last >= 1.0) {                                                           \
      std::cout << "Average framerate(" << _WHAT_ << "): "                             \
                << double(count) / double(now - last) << " Hz" << std::endl;           \
      count = 0;                                                                       \
      last = now;                                                                      \
    }                                                                                  \
  } while (false)
// clang-format on

namespace Ui {
class MainWindow;
}

class PCDVideoPlayer : public QMainWindow {
  Q_OBJECT
public:
  using Cloud = pcl::PointCloud<pcl::PointXYZRGBA>;
  using CloudPtr = Cloud::Ptr;
  using CloudConstPtr = Cloud::ConstPtr;

  PCDVideoPlayer();

  ~PCDVideoPlayer() override = default;

protected:
  void
  refreshView();

  pcl::visualization::PCLVisualizer::Ptr vis_;
  pcl::PointCloud<pcl::PointXYZRGBA>::Ptr cloud_;

  QMutex mtx_;
  QMutex vis_mtx_;
  Ui::MainWindow* ui_;
  QTimer* vis_timer_;

  QString dir_;

  std::vector<std::string> pcd_files_;
  std::vector<pcl_fs::path> pcd_paths_;

  /** \brief The current displayed frame */
  unsigned int current_frame_;
  /** \brief Store the number of loaded frames */
  unsigned int nr_of_frames_;

  /** \brief Indicate that pointclouds were loaded */
  bool cloud_present_;
  /** \brief Indicate that the timeoutSlot needs to reload the pointcloud */
  bool cloud_modified_;

  /** \brief Indicate that files should play continuously */
  bool play_mode_;
  /** \brief In play mode only update if speed_counter_ == speed_value */
  unsigned int speed_counter_;
  /**
   * \brief Fixes the speed in steps of 5ms, default 5, gives 5+1 * 5ms = 30ms = 33,3
   * Hz playback speed
   */
  unsigned int speed_value_;

public Q_SLOTS:
  void
  playButtonPressed()
  {
    play_mode_ = true;
  }

  void
  stopButtonPressed()
  {
    play_mode_ = false;
  }

  void
  backButtonPressed();

  void
  nextButtonPressed();

  void
  selectFolderButtonPressed();

  void
  selectFilesButtonPressed();

  void
  indexSliderValueChanged(int value);

private Q_SLOTS:
  void
  timeoutSlot();
};
