/*
 *   ORXONOX - the hottest 3D action shooter ever to exist
 *                    > www.orxonox.net <
 *
 *
 *   License notice:
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation; either version 2
 *   of the License, or (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 *   Author:
 *      jostoffe
 *   Co-authors:
 *      ...
 *
 */

#include "ArrowController.h"
#include "HumanController.h"
#include "worldentities/ControllableEntity.h"

#include "core/CoreIncludes.h"
#include "util/Math.h"

namespace orxonox
{

    RegisterClass(ArrowController);

    ArrowController::ArrowController(Context* context) : Controller(context)
    {

        RegisterObject(ArrowController);

        this->currentGPSPoint_ = 0;
        this->accuracy_ = 1000.0f;
    }

    ArrowController::~ArrowController()
    {
      for (WorldEntity* gpspoint : this->gpspoints_)
        {
            if(gpspoint)
                gpspoint->destroy();
        }

    }

    //Set the distance you need to reach before the next waypoint will be selected
    void ArrowController::setAccuracy(float accuracy){
      this->accuracy_ = accuracy;
    }

    float ArrowController::getAccuracy(){
      return this->accuracy_;
    };
    
    void ArrowController::addGPSPoint(WorldEntity* gpspoint)
    {
        this->gpspoints_.push_back(gpspoint);
    }

    WorldEntity* ArrowController::getGPSPoint(unsigned int index) const
    {
        if (index < this->gpspoints_.size())
            return this->gpspoints_[index];
        else
            return nullptr;
    }

    void ArrowController::XMLPort(Element& xmlelement, XMLPort::Mode mode)
    {
        SUPER(ArrowController, XMLPort, xmlelement, mode);

        XMLPortObject(ArrowController, WorldEntity, "gpspoints", addGPSPoint, getGPSPoint,  xmlelement, mode);
        XMLPortParam(ArrowController, "accuracy", setAccuracy, getAccuracy, xmlelement, mode);
    }

    void ArrowController::tick(float dt)
    {
        if (!this->isActive())
            return;

        if (this->gpspoints_.size() == 0 || !this->getControllableEntity())
            return;
        //Set all waypoint to invisible at the beginning  
        if (this->currentGPSPoint_ == 0){
          for(unsigned int i = 0; i < this->gpspoints_.size(); i++ )
            this->gpspoints_[i]->setVisible(false);
        }
        //Make the arrow inivisible as soon as you reached the last Waypoint, otherwise make the next waypoint visible 
        if(currentGPSPoint_ >= gpspoints_.size()){
          this->getControllableEntity()->setVisible(false);
          return;
        }
        else this->gpspoints_[this->currentGPSPoint_]->setVisible(true);

        //Set the next waypoint as target as soon as you reached the previous one
        if (this->gpspoints_[this->currentGPSPoint_]->getWorldPosition().squaredDistance(this->getControllableEntity()->getPosition()) <= this->accuracy_){
            this->gpspoints_[this->currentGPSPoint_]->setVisible(false);
            this->currentGPSPoint_ = (this->currentGPSPoint_ + 1);
            return;
          }
  
        Vector3 target = gpspoints_[currentGPSPoint_]->getWorldPosition();
        WorldEntity::TransformSpace trans = WorldEntity::TransformSpace::World;

        //Get the position and orientation of the Spaceship
        Vector3 spaceShipPosition = HumanController::getLocalControllerSingleton()->getControllableEntity()->getWorldPosition();
        Quaternion spaceShipOrientation = HumanController::getLocalControllerSingleton()->getControllableEntity()->getOrientation();
        
        //Calculate the new arrow position
        Vector3 ss_y = spaceShipOrientation.yAxis();
        spaceShipPosition.x += 20 * ss_y.x;
        spaceShipPosition.y += 20 * ss_y.y;
        spaceShipPosition.z += 20 * ss_y.z;
        
        //Update Arrow position and orientation  
        this->getControllableEntity()->setPosition(spaceShipPosition);
        this->getControllableEntity()->lookAt(target, trans, Vector3(0,0,1));
        
        
    }
}