/******************************************************************/
/* 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 "errorMessage.h"
#include "sceneIO_core.h"
#include "sceneIO_basis.h"
#include "sceneIO_cache.h"
#include "sceneIO_texture.h"
#include "sceneIO_transformation3d.h"

#include "raycasting.h"
#include "pathtracing.h"
#include "recursiveRaytracing.h"

#include "bvh_intersector.h"
#include "linear_intersector.h"

#include "environmentMap.h"

bool importCamera(const XMLNode& node, camera& cam)
{
  // sanity check
  assert(node.name() == "camera");

  // import camera
  cam = camera( getVec3d(node, "eye", vec3d(0.0f, 0.0f, 0.0f)),
		getVec3d(node, "view", vec3d(0.0f, 0.0f, -1.0f)),
		getVec3d(node, "up", vec3d(0.0f, 1.0f, 0.0f)),
		getFloat(node, "fov", 60),
		getInteger(node, "width", 256),
		getInteger(node, "height", 256) );

  // Done.
  return( getString(node, "auto", "false") == "true");
}


void importRenderEngine(const XMLNode& node, std::unique_ptr<const render_base>& renderer)
{
  // sanity check
  assert(node.name() == "renderer");

  // get render engine type
  std::string type = getString(node, "type", "raycasting");

  // create render type
  if(type == "raycasting") renderer = std::unique_ptr<const render_base>( new raycasting() );
  else if(type == "recursiveRaytracing") renderer = std::unique_ptr<const render_base>( new recursiveRaytracing( getInteger(node, "maxDepth", 1), getInteger(node, "samplesPerPixel", 1) ) );
  else if(type == "pathtracing") renderer = std::unique_ptr<const render_base>( new pathtracing( getInteger(node, "samplesPerPixel", 1), getString(node, "directOnly", "false") == "true") );
  else errorMessage("Unknown render engine type (%s)", type.c_str());

  // Done.
}


void importIntersector(const XMLNode& node, std::unique_ptr<const intersector_factory_base>& intersector)
{
  // sanity check
  assert(node.name() == "intersector");

  // get intersector type
  std::string type = getString(node, "type", "linear");

  // create intersector
  if(type == "linear") intersector = std::unique_ptr<const intersector_factory_base>( new linear_intersector_factory());
  else if(type == "bvh") intersector = std::unique_ptr<const intersector_factory_base>( new bvh_intersector_factory());
  else errorMessage("Unknown intersector type (%s)", type.c_str());

  // Done.  
}


void importEnvironmentMap(const XMLNode& node, nodeCache<texture_base>& texture_cache, const std::string& rootDir, std::unique_ptr<const environmentMap>& map)
{
  // sanity check
  assert(node.name() == "environmentMap");

  // node properties
  transformation3d transform;
  std::shared_ptr<const texture_base> texture;

  // check child nodes
  for(XMLNode child=node.firstChild(); child.isValid(); child++)
  {
    std::string name = child.name();
    if(name == "transformation") importTransformation(child, transform);
    else if(name == "texture") texture = importTexture(child, texture_cache, rootDir);
    else errorMessage("Unknown node (%s) in environmentMap.", name.c_str());
  }

  // Done.
  map = std::unique_ptr<const environmentMap>(new environmentMap(texture, transform));
}