/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   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, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Christian Meyer
   co-programmer: Benjamin Grauer
*/
#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_WORLD_ENTITY

#include "camera.h"
#include "key_mapper.h"
#include "glincl.h"
//#include "util/loading/load_param.h"
#include "world_entity.h"

ObjectListDefinition(Camera);

/**
 *  creates a Camera
*/
Camera::Camera()
{
  this->registerObject(this, Camera::_objectList);
  this->init();
}

/*
Camera::Camera(const TiXmlElement* root)
{
  this->registerObject(this, Camera::_objectList);
  this->init();
  this->loadParams(root);
}
*/

/**
 *  default destructor
*/
Camera::~Camera()
{}

void Camera::init()
{
  this->setName("camera");
  this->target = new CameraTarget();

  this->subscribeEvent(ES_GAME, KeyMapper::PEV_VIEW0);
  this->subscribeEvent(ES_GAME, KeyMapper::PEV_VIEW1);
  this->subscribeEvent(ES_GAME, KeyMapper::PEV_VIEW2);
  this->subscribeEvent(ES_GAME, KeyMapper::PEV_VIEW3);
  this->subscribeEvent(ES_GAME, KeyMapper::PEV_VIEW4);
  this->subscribeEvent(ES_GAME, KeyMapper::PEV_VIEW5);

  //this->setFovy(90);
  this->setAspectRatio(1.33f);
  this->setClipRegion(.1, 10000);
  
  this->viewTopFovy = 60;
  this->viewNormalFovy = 90;
  this->viewFrontFovy = 120;
  this->viewRightFovy = 90;
  this->viewLeftFovy = 90;

  this->viewTopDistance = 70;
  this->viewNormalDistance = 10;
  this->viewFrontDistance = 4;
  this->viewRightDistance = 10;
  this->viewLeftDistance = 10;

  //this->loadParams(doc.RootElement());

  this->setViewMode(Camera::ViewNormal);

  this->setParentMode(PNODE_ALL);
  this->eventHandling = true;
}

/**
 *  focuses the Camera onto a Target
 * @param target the new PNode the Camera should look at.
*/
void Camera::lookAt(PNode* target)
{
  this->target->setParent(target);
}

/**
 * @returns The PNode of the Target (from there you can get position and so on
*/
PNode* Camera::getTargetNode() const
{
  return (PNode*)this->target;
}

/**
 *  sets a new AspectRatio
 * @param aspectRatio the new aspect ratio to set (width / height)
*/
void Camera::setAspectRatio(float aspectRatio)
{
  this->aspectRatio = aspectRatio;
}

/**
 * Sets a new clipping region
 * @param nearClip The near clip plane
 * @param farClip The far clip plane
*/
void Camera::setClipRegion(float nearClip, float farClip)
{
  this->nearClip = nearClip;
  this->farClip = farClip;
}

/**
 *  sets the new VideoMode and initializes iteration to it.
 * @param mode the mode to change to.
*/
void Camera::setViewMode(ViewMode mode)
{
  currentMode = mode;
  switch (mode)
  {
    default:
    case Camera::ViewNormal:
    {
      this->fovy = viewNormalFovy;
      this->toFovy = viewNormalFovy;
      //this->fovy = 60;
      //this->toFovy = 60;
      this->setRelCoorSoft(-2.0/3.0 * this->viewNormalDistance, 1.0/3.0 * this->viewNormalDistance, 0);
      this->target->setRelCoorSoft(0,0,0);
      break;
    }
    case Camera::ViewBehind:
      break;
    case Camera::ViewFront:
    {
      this->fovy = viewFrontFovy;
      this->toFovy = viewFrontFovy;
      this->setRelCoorSoft(this->viewFrontDistance, 0, 0, 5);
      this->target->setRelCoorSoft(Vector(10,0,0), 5);
      break;
    }
    case Camera::ViewLeft:
    {
      this->fovy = viewLeftFovy;
      this->toFovy = viewLeftFovy;
      this->setRelCoorSoft(0, 1, -viewLeftDistance, .5);
      this->target->setRelCoorSoft(0,0,0);
      break;
    }
    case Camera::ViewRight:
    {
      this->fovy = viewRightFovy;
      this->toFovy = viewRightFovy;
      this->setRelCoorSoft(Vector(0, 1, viewRightDistance), 0.5);
      this->target->setRelCoorSoft(0,0,0);
      break;
    }
    case Camera::ViewTop:
    {
      this->fovy= viewTopFovy;
      this->toFovy = viewTopFovy;
      this->setRelCoor(Vector(-0.05, this->viewTopDistance , 0));
      this->target->setRelCoor(0,0,0);
    }
  }
}


/**
 *  Updates the position of the camera.
 * @param dt: The time that elapsed.
*/
void Camera::tick(float dt)
{
  //update frustum plane
  this->viewVector = (this->target->getAbsCoor() - this->getAbsCoor()).getNormalized();
  this->frustumPlane = Plane(this->viewVector, this->getAbsCoor() + this->viewVector * 0.1);

  this->upVector =  this->getAbsDirV();


  float tmpFovy = (this->toFovy - this->fovy);
  if (fabsf(tmpFovy) > 0.01)
    this->fovy += tmpFovy * fabsf(dt);
}


/**
 *  initialize rendering perspective according to this camera
 *
 * This is called immediately before the rendering cycle starts, it sets all global
 * rendering options as well as the GL_PROJECTION matrix according to the camera.
 */
void Camera::apply ()
{
  // switching to Projection Matrix
  glMatrixMode (GL_PROJECTION);
  glLoadIdentity ();

  gluPerspective(this->fovy,
                 this->aspectRatio,
                 this->nearClip,
                 this->farClip);


    // setting up the perspective
  // speed-up feature
  glMatrixMode (GL_MODELVIEW);
  glLoadIdentity();


}

void Camera::project()
{
  Vector cameraPosition = this->getAbsCoor();
  Vector targetPosition = this->target->getAbsCoor();

       // Setting the Camera Eye, lookAt and up Vectors
  gluLookAt(cameraPosition.x, cameraPosition.y, cameraPosition.z,
            targetPosition.x, targetPosition.y, targetPosition.z,
            this->upVector.x, this->upVector.y, this->upVector.z);
}


/**
 *  processes an event
 * @param event: the event to process
*/
void Camera::process(const Event &event)
{
  if (eventHandling == true)
  {
    if( event.type == KeyMapper::PEV_VIEW0)
    {
      this->setViewMode(Camera::ViewNormal);
    }
    else if( event.type == KeyMapper::PEV_VIEW1)
    {
      this->setViewMode(Camera::ViewBehind);
    }
    else if( event.type == KeyMapper::PEV_VIEW2)
    {
      this->setViewMode(Camera::ViewFront);
    }
    else if( event.type == KeyMapper::PEV_VIEW3)
    {
      this->setViewMode(Camera::ViewLeft);
    }
    else if( event.type == KeyMapper::PEV_VIEW4)
    {
      this->setViewMode(Camera::ViewRight);
    }
    else if( event.type == KeyMapper::PEV_VIEW5)
    {
      this->setViewMode(Camera::ViewTop);
    }
  }
}

/*
void Camera::loadParams(const TiXmlElement* root)
{
  // Do the PNode loading stuff
  PNode::loadParams(root);

  LoadParam(root, "viewTopFovy", this, Camera, setViewTopFovy);
  LoadParam(root, "viewFrontFovy", this, Camera, setViewFrontFovy);
  LoadParam(root, "viewLeftFovy", this, Camera, setViewLeftFovy);
  LoadParam(root, "viewRightFovy", this, Camera, setViewRightFovy);
  LoadParam(root, "viewBehindFovy", this, Camera, setViewBehindFovy);
  LoadParam(root, "viewNormalFovy", this, Camera, setViewNormalFovy);

  LoadParam(root, "viewTopDistance", this, Camera, setViewTopDistance);
  LoadParam(root, "viewFrontDistance", this, Camera, setViewFrontDistance);
  LoadParam(root, "viewLeftDistance", this, Camera, setViewLeftDistance);
  LoadParam(root, "viewRightDistance", this, Camera, setViewRightDistance);
  LoadParam(root, "viewBehindDistance", this, Camera, setViewBehindDistance);
  LoadParam(root, "viewNormalDistance", this, Camera, setViewNormalDistance);
}
*/

void Camera::setViewTopFovy(float fovy)
{
  this->viewTopFovy = fovy;
}

void Camera::setViewFrontFovy(float fovy)
{
  this->viewFrontFovy = fovy;
}

void Camera::setViewLeftFovy(float fovy)
{
  this->viewLeftFovy = fovy;
}

void Camera::setViewRightFovy(float fovy)
{
  this->viewRightFovy = fovy;
}

void Camera::setViewBehindFovy(float fovy)
{
  this->viewBehindFovy = fovy;
}

void Camera::setViewNormalFovy(float fovy)
{
  this->viewNormalFovy = fovy;
}

void Camera::setViewTopDistance(float Distance)
{
  this->viewTopDistance = Distance;
}

void Camera::setViewFrontDistance(float Distance)
{
  this->viewFrontDistance = Distance;
}

void Camera::setViewLeftDistance(float Distance)
{
  this->viewLeftDistance = Distance;
}

void Camera::setViewRightDistance(float Distance)
{
  this->viewRightDistance = Distance;
}

void Camera::setViewBehindDistance(float Distance)
{
  this->viewBehindDistance = Distance;
}

void Camera::setViewNormalDistance(float Distance)
{
  this->viewNormalDistance = Distance;
}


///////////////////
// CAMERA-TARGET //
///////////////////

ObjectListDefinition(CameraTarget);
CameraTarget::CameraTarget()
{
  this->registerObject(this, CameraTarget::_objectList);
  //  this->setParentMode(PNODE_MOVEMENT);
}