/*
   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
*/

#include <iostream>

#include "world_entity.h"
#include "list.h"
#include "vector.h"
#include "obb_tree.h"

using namespace std;

/**
 *  Loads the WordEntity-specific Part of any derived Class
*/
WorldEntity::WorldEntity(const TiXmlElement* root)
{
  this->setClassID(CL_WORLD_ENTITY, "WorldEntity");

  this->model = NULL;
  this->obbTree = NULL;

  if (root)
    this->loadParams(root);

  this->setVisibiliy(true);
}

/**
 *  standard destructor
*/
WorldEntity::~WorldEntity ()
{
  // if( collisioncluster != NULL) delete collisioncluster;
  if (this->model)
    ResourceManager::getInstance()->unload(this->model);
  if( this->obbTree)
    delete this->obbTree;
}

void WorldEntity::loadParams(const TiXmlElement* root)
{
  static_cast<PNode*>(this)->loadParams(root);
  // Model Loading
  LoadParam<WorldEntity>(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)") ;
}

/**
 * loads a Model onto a WorldEntity
 * @param fileName the name of the model to load
 * @param scaling the Scaling of the model
*/
void WorldEntity::loadModelWithScale(const char* fileName, float scaling)
{
  if (this->model)
    ResourceManager::getInstance()->unload(this->model, RP_LEVEL);
  if (fileName != NULL)
  {
    PRINTF(4)("fetching %s\n", fileName);
    if (scaling == 1.0)
      this->model = (Model*)ResourceManager::getInstance()->load(fileName, OBJ, RP_CAMPAIGN);
    else
      this->model = (Model*)ResourceManager::getInstance()->load(fileName, OBJ, RP_CAMPAIGN, &scaling);

    this->buildObbTree(4);
  }
  else
    this->model = NULL;
}

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

  if (this->model)
  {
    PRINTF(4)("creating obb tree\n");
    this->obbTree = new OBBTree(depth, (sVec3D*)this->model->getVertexArray(), this->model->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)
{}


/**
 * gets the Character attributes of this worldentity
 * @returns character attributes
*/
CharacterAttributes* WorldEntity::getCharacterAttributes()
{}


/**
 *  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)
{
  PRINTF(3)("collision %s vs %s @ (%f,%f,%f)\n", this->getClassName(), entity->getClassName(), location.x, location.y, location.z);
}

/**
 *  this function is called, when the ship is hit by a waepon
 * @param weapon: the laser/rocket/shoot that hits.
 * @param loc: place where it is hit
 *
 * calculate the damage depending
*/
void WorldEntity::hit(WorldEntity* weapon, Vector* loc) {}


/**
 *  this is called immediately after the Entity has been constructed and initialized
 *
 * Put any initialisation code that requires knowledge of location (placement if the Entity is free) and owner of the entity here.
 * DO NOT place such code in the constructor, those variables are set AFTER the entity is constucted.
*/
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).
*/
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()
{
  glMatrixMode(GL_MODELVIEW);
  glPushMatrix();
  float matrix[4][4];

  /* translate */
  glTranslatef (this->getAbsCoor ().x,
                this->getAbsCoor ().y,
                this->getAbsCoor ().z);
  /* rotate */
  this->getAbsDir ().matrix (matrix);
  glMultMatrixf((float*)matrix);

  if (this->model)
    this->model->draw();
  glPopMatrix();
}


void WorldEntity::drawBVTree(int depth, int drawMode)
{
  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();
}