/******************************************************************/
/* This file is part of the homework assignments for CSCI-427/527 */
/* at The College of William & Mary and authored by Pieter Peers. */
/* No part of this file, whether altered or in original form, can */
/* be distributed or used outside the context of CSCI-427/527     */
/* without consent of either the College of William & Mary or     */
/* Pieter Peers.                                                  */
/******************************************************************/
#include <cassert>
#include "sceneIO_core.h"
#include "sceneIO_transformation3d.h"

#include "rotationX3d.h"
#include "rotationY3d.h"
#include "rotationZ3d.h"
#include "rotation3d.h"
#include "translation3d.h"
#include "scale3d.h"

#include "errorMessage.h"

static transformation3d importRotationX(const XMLNode& node)
{
  return rotationX3d(getFloat(node, "angle", 0.0f));
}

static transformation3d importRotationY(const XMLNode& node)
{
  return rotationY3d(getFloat(node, "angle", 0.0f));
}

static transformation3d importRotationZ(const XMLNode& node)
{
  return rotationZ3d(getFloat(node, "angle", 0.0f));
}

static transformation3d importRotationAxis(const XMLNode& node)
{
  return rotation3d(getFloat(node, "angle", 0.0f), 
                    getVec3d(node, "axis", vec3d(0.0f, 0.0f, 1.0f)));
}

static transformation3d importTranslation(const XMLNode& node)
{
  return translation3d(getVec3d(node, "offset", vec3d(0.0f)));
}

static transformation3d importScale(const XMLNode& node)
{
  vec3d scale = getVec3d(node, "scale", vec3d(1.0f));
  return scale3d(scale.x, scale.y, scale.z);
}



void importTransformation(const XMLNode& node, transformation3d& transform)
{
  // sanity check
  assert(node.name() == "transformation");

  // accumulate all child nodes
  for(XMLNode childNode = node.firstChild(); childNode.isValid(); childNode++)
  {
    // get transformation type:
    std::string type = childNode.name();

    // parse
    if(type == "rotationX") transform *= importRotationX(childNode);
    else if(type == "rotationY") transform *= importRotationY(childNode);
    else if(type == "rotationZ") transform *= importRotationZ(childNode);
    else if(type == "rotation") transform *= importRotationAxis(childNode);
    else if(type == "translation") transform *= importTranslation(childNode);
    else if(type == "scale") transform *= importScale(childNode);
    else errorMessage("Unknown transformation (%s)", type.c_str());
  }

  // Done.
}