/*
   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: Patrick Boenzli
   co-programmer: Christian Meyer
*/
#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_WORLD_ENTITY

#include "world_entity.h"
#include "shell_command.h"

#include "model.h"
#include "resource_manager.h"
#include "load_param.h"
#include "list.h"
#include "vector.h"
#include "obb_tree.h"

using namespace std;

SHELL_COMMAND(model, WorldEntity, loadModel)
    ->describe("sets the Model of the WorldEntity")
    ->defaultValues(2, "models/ships/fighter.obj", 1.0);


/**
 *  Loads the WordEntity-specific Part of any derived Class
 *
 * @param root: Normally NULL, as the Derived Entities define a loadParams Function themeselves,
 *              that can calls WorldEntities loadParams for itself.
 */
WorldEntity::WorldEntity(const TiXmlElement* root)
  : Synchronizeable()
{
  this->setClassID(CL_WORLD_ENTITY, "WorldEntity");

  this->obbTree = NULL;

  if (root != NULL)
    this->loadParams(root);

  this->setVisibiliy(true);
}

/**
 *  standard destructor
*/
WorldEntity::~WorldEntity ()
{
  // Delete the obbTree
  if( this->obbTree != NULL)
    delete this->obbTree;

  // Delete the model (unregister it with the ResourceManager)
  this->setModel(NULL);
}

/**
 * loads the WorldEntity Specific Parameters.
 * @param root: the XML-Element to load the Data From
 */
void WorldEntity::loadParams(const TiXmlElement* root)
{
  // Do the PNode loading stuff
  static_cast<PNode*>(this)->loadParams(root);

  // Model Loading
  LoadParam(root, "model", this, WorldEntity, loadModel)
      .describe("the fileName of the model, that should be loaded onto this world-entity. (must be relative to the data-dir)")
      .defaultValues(3, NULL, 1.0f, 0);

}

/**
 * loads a Model onto a WorldEntity
 * @param fileName the name of the model to load
 * @param scaling the Scaling of the model
 *
 * @todo fix this, so it only has one loadModel-Function.
*/
void WorldEntity::loadModel(const char* fileName, float scaling, unsigned int modelNumber)
{
  if (fileName != NULL)
  {
    PRINTF(4)("fetching %s\n", fileName);
    if (scaling == 1.0)
      this->setModel((Model*)ResourceManager::getInstance()->load(fileName, OBJ, RP_CAMPAIGN));
    else
      this->setModel((Model*)ResourceManager::getInstance()->load(fileName, OBJ, RP_CAMPAIGN, &scaling));

    this->buildObbTree(4);
  }
  else
    this->setModel(NULL);
}

/**
 * sets a specific Model for the Object.
 * @param model The Model to set
 * @param modelNumber the n'th model in the List to get.
 */
void WorldEntity::setModel(Model* model, unsigned int modelNumber)
{
  if (this->models.size() <= modelNumber)
    this->models.resize(modelNumber+1, NULL);

  if (this->models[modelNumber] != NULL)
  { 
    Resource* resource = ResourceManager::getInstance()->locateResourceByPointer(this->models[modelNumber]);
    if (resource != NULL)
      ResourceManager::getInstance()->unload(resource, RP_LEVEL);
    else
      delete this->models[modelNumber];
  }
  this->models[modelNumber] = model;

//   if (this->model != NULL)  
//     this->buildObbTree(4);
}


/**
 * builds the obb-tree
 * @param depth the depth to calculate
 */
bool WorldEntity::buildObbTree(unsigned int depth)
{
  if (this->obbTree)
    delete this->obbTree;

  if (this->models[0] != NULL)
  {
    PRINTF(4)("creating obb tree\n");


    this->obbTree = new OBBTree(depth, (sVec3D*)this->models[0]->getVertexArray(), this->models[0]->getVertexCount());
    return true;
  }
  else
  {
    PRINTF(2)("could not create obb-tree, because no model was loaded yet\n");
    this->obbTree = NULL;
    return false;
  }
}


/**
 * sets the character attributes of a worldentity
 * @param character attributes
 *
 * these attributes don't have to be set, only use them, if you need them
*/
//void WorldEntity::setCharacterAttributes(CharacterAttributes* charAttr)
//{}


/**
 *  this function is called, when two entities collide
 * @param entity: the world entity with whom it collides
 *
 * Implement behaviour like damage application or other miscellaneous collision stuff in this function
 */
void WorldEntity::collidesWith(WorldEntity* entity, const Vector& location)
{
  /**
   * THIS IS A DEFAULT COLLISION-Effect.
   * IF YOU WANT TO CREATE A SPECIFIC COLLISION ON EACH OBJECT
   * USE::
   * if (entity->isA(CL_WHAT_YOU_ARE_LOOKING_FOR)) { printf "dothings"; };
   *
   * You can always define a default Action.... don't be affraid just test it :)
   */
//  PRINTF(3)("collision %s vs %s @ (%f,%f,%f)\n", this->getClassName(), entity->getClassName(), location.x, location.y, location.z);
}


/**
 *  this is called immediately after the Entity has been constructed, initialized and then Spawned into the World
 *
 */
void WorldEntity::postSpawn ()
{
}


/**
 *  this method is called by the world if the WorldEntity leaves valid gamespace
 *
 * For free entities this means it left the Track boundaries. With bound entities it means its Location adresses a
 * place that is not in the world anymore. In both cases you might have to take extreme measures (a.k.a. call destroy).
 *
 * NOT YET IMPLEMENTED
 */
void WorldEntity::leftWorld ()
{
}


/**
 *  this method is called every frame
 * @param time: the time in seconds that has passed since the last tick
 *
 * Handle all stuff that should update with time inside this method (movement, animation, etc.)
*/
void WorldEntity::tick(float time)
{
}


/**
 *  the entity is drawn onto the screen with this function
 *
 * This is a central function of an entity: call it to let the entity painted to the screen.
 * Just override this function with whatever you want to be drawn.
*/
void WorldEntity::draw() const
{
  glMatrixMode(GL_MODELVIEW);
  glPushMatrix();
  float matrix[4][4];

  /* translate */
  glTranslatef (this->getAbsCoor ().x,
                this->getAbsCoor ().y,
                this->getAbsCoor ().z);
  /* rotate */ // FIXME: devise a new Way to rotate this
  this->getAbsDir ().matrix (matrix);
  glMultMatrixf((float*)matrix);

  if (this->models[0])
    this->models[0]->draw();
  glPopMatrix();
}

/**
 * DEBUG-DRAW OF THE BV-Tree.
 * @param depth What depth to draw
 * @param drawMode the mode to draw this entity under
 */
void WorldEntity::drawBVTree(unsigned int depth, int drawMode) const
{
  glMatrixMode(GL_MODELVIEW);
  glPushMatrix();
  /* translate */
  glTranslatef (this->getAbsCoor ().x,
                this->getAbsCoor ().y,
                this->getAbsCoor ().z);
  /* rotate */
  Vector tmpRot = this->getAbsDir().getSpacialAxis();
  glRotatef (this->getAbsDir().getSpacialAxisAngle(), tmpRot.x, tmpRot.y, tmpRot.z );

  if (this->obbTree)
    this->obbTree->drawBV(depth, drawMode);
  glPopMatrix();
}