/*
 * Copyright (c) 2008, Willow Garage, 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 Willow Garage, Inc. 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.
 */

#ifndef RVIZ_SELECTION_HANDLER_H
#define RVIZ_SELECTION_HANDLER_H

#include <vector>
#include <set>

#include <boost/shared_ptr.hpp>
#include <boost/unordered_map.hpp>

#include <OgreMovableObject.h>

#include "rviz/selection/forwards.h"
#include "rviz/selection/selection_handler.h"
#include "rviz/viewport_mouse_event.h"
#include "rviz/interactive_object.h"

namespace Ogre
{
class WireBoundingBox;
class SceneNode;
class MovableObject;
}

namespace rviz
{

class DisplayContext;
class Property;
class ViewportMouseEvent;

typedef std::vector<Ogre::AxisAlignedBox> V_AABB;

class SelectionHandler
{
public:
  SelectionHandler( DisplayContext* context );
  virtual ~SelectionHandler();

  void addTrackedObjects( Ogre::SceneNode* node );
  void addTrackedObject(Ogre::MovableObject* object);
  void removeTrackedObject(Ogre::MovableObject* object);

  virtual void updateTrackedBoxes();

  /** @brief Override to create properties of the given picked object(s).
   *
   * Top-level properties created here should be added to
   * #properties_ so they will be automatically deleted by
   * deleteProperties().
   *
   * This base implementation does nothing. */
  virtual void createProperties( const Picked& obj, Property* parent_property ) {}

  /** @brief Destroy all properties for the given picked object(s).
   *
   * This base implementation destroys all the properties in #properties_.
   *
   * If createProperties() adds all the top-level properties to
   * #properties_, there is no need to override this in a
   * subclass. */
  virtual void destroyProperties( const Picked& obj, Property* parent_property );

  /** @brief Override to update property values.
   *
   * updateProperties() is called on a timer to give selection
   * handlers a chance to update displayed property values.
   * Subclasses with properties that can change should implement this
   * to update the property values based on new information from the
   * selected object(s).
   *
   * This base implementation does nothing. */
  virtual void updateProperties() {}

  virtual bool needsAdditionalRenderPass(uint32_t pass)
  {
    return false;
  }

  virtual void preRenderPass(uint32_t pass);
  virtual void postRenderPass(uint32_t pass);

  virtual void getAABBs(const Picked& obj, V_AABB& aabbs);

  virtual void onSelect(const Picked& obj);
  virtual void onDeselect(const Picked& obj);

  /** @brief Set an object to listen to mouse events and other
   * interaction calls during use of the 'interact' tool. */
  virtual void setInteractiveObject( InteractiveObjectWPtr object );

  /** @brief Get the object to listen to mouse events and other
   * interaction calls during use of the 'interact' tool.
   *
   * Returns a boost::weak_ptr to the object, which may or may not
   * point to something.  Do not lock() the result and hold it for
   * long periods because it may cause something visual to stick
   * around after it was meant to be destroyed. */
  virtual InteractiveObjectWPtr getInteractiveObject();

  CollObjectHandle getHandle() const { return pick_handle_; }

protected:
  /** @brief Create or update a box for the given handle-int pair, with the box specified by @a aabb. */
  void createBox(const std::pair<CollObjectHandle, uint64_t>& handles, const Ogre::AxisAlignedBox& aabb, const std::string& material_name);

  /** @brief Destroy the box associated with the given handle-int pair, if there is one. */
  void destroyBox(const std::pair<CollObjectHandle, uint64_t>& handles);

  QList<Property*> properties_;

  typedef std::map<std::pair<CollObjectHandle, uint64_t>, std::pair<Ogre::SceneNode*, Ogre::WireBoundingBox*> > M_HandleToBox;
  M_HandleToBox boxes_;

  DisplayContext* context_;

  typedef std::set<Ogre::MovableObject*> S_Movable;
  S_Movable tracked_objects_;

  class Listener : public Ogre::MovableObject::Listener
  {
  public:
    Listener(SelectionHandler* handler)
    : handler_(handler)
    {}
    virtual void objectMoved(Ogre::MovableObject* object)
    {
      handler_->updateTrackedBoxes();
    }

    virtual void objectDestroyed(Ogre::MovableObject* object)
    {
      handler_->removeTrackedObject(object);
    }

    SelectionHandler* handler_;
  };
  typedef boost::shared_ptr<Listener> ListenerPtr;
  ListenerPtr listener_;

  InteractiveObjectWPtr interactive_object_;

private:
  // pick_handle_ must never be changed, otherwise the destructor will
  // call removeObject() with the wrong handle.  Use getHandle() to
  // access the value.
  CollObjectHandle pick_handle_;

  friend class SelectionManager;
};

typedef boost::shared_ptr<SelectionHandler> SelectionHandlerPtr;
typedef std::vector<SelectionHandlerPtr> V_SelectionHandler;
typedef std::set<SelectionHandlerPtr> S_SelectionHandler;

}

#endif
