/*
 * 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
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

/** \file
 * \ingroup collada
 */

/* COLLADABU_ASSERT, may be able to remove later */
#include "COLLADABUPlatform.h"
#include "collada_utils.h"

#include "BLI_linklist.h"
#include "ED_armature.h"

UnitConverter::UnitConverter() : unit(), up_axis(COLLADAFW::FileInfo::Z_UP)
{
  axis_angle_to_mat4_single(x_up_mat4, 'Y', -0.5 * M_PI);
  axis_angle_to_mat4_single(y_up_mat4, 'X', 0.5 * M_PI);

  unit_m4(z_up_mat4);
  unit_m4(scale_mat4);
}

void UnitConverter::read_asset(const COLLADAFW::FileInfo *asset)
{
  unit = asset->getUnit();
  up_axis = asset->getUpAxisType();
}

UnitConverter::UnitSystem UnitConverter::isMetricSystem()
{
  switch (unit.getLinearUnitUnit()) {
    case COLLADAFW::FileInfo::Unit::MILLIMETER:
    case COLLADAFW::FileInfo::Unit::CENTIMETER:
    case COLLADAFW::FileInfo::Unit::DECIMETER:
    case COLLADAFW::FileInfo::Unit::METER:
    case COLLADAFW::FileInfo::Unit::KILOMETER:
      return UnitConverter::Metric;
    case COLLADAFW::FileInfo::Unit::INCH:
    case COLLADAFW::FileInfo::Unit::FOOT:
    case COLLADAFW::FileInfo::Unit::YARD:
      return UnitConverter::Imperial;
    default:
      return UnitConverter::None;
  }
}

float UnitConverter::getLinearMeter()
{
  return (float)unit.getLinearUnitMeter();
}

void UnitConverter::convertVector3(COLLADABU::Math::Vector3 &vec, float *v)
{
  v[0] = vec.x;
  v[1] = vec.y;
  v[2] = vec.z;
}

// TODO need also for angle conversion, time conversion...

void UnitConverter::dae_matrix_to_mat4_(float out[4][4], const COLLADABU::Math::Matrix4 &in)
{
  // in DAE, matrices use columns vectors, (see comments in COLLADABUMathMatrix4.h)
  // so here, to make a blender matrix, we swap columns and rows
  for (int i = 0; i < 4; i++) {
    for (int j = 0; j < 4; j++) {
      out[i][j] = in[j][i];
    }
  }
}

void UnitConverter::mat4_to_dae(float out[4][4], float in[4][4])
{
  transpose_m4_m4(out, in);
}

void UnitConverter::mat4_to_dae_double(double out[4][4], float in[4][4])
{
  float mat[4][4];

  mat4_to_dae(mat, in);

  for (int i = 0; i < 4; i++) {
    for (int j = 0; j < 4; j++) {
      out[i][j] = mat[i][j];
    }
  }
}

float (&UnitConverter::get_rotation())[4][4]
{
  switch (up_axis) {
    case COLLADAFW::FileInfo::X_UP:
      return x_up_mat4;
      break;
    case COLLADAFW::FileInfo::Y_UP:
      return y_up_mat4;
      break;
    default:
      return z_up_mat4;
      break;
  }
}

float (&UnitConverter::get_scale())[4][4]
{
  return scale_mat4;
}

void UnitConverter::calculate_scale(Scene &sce)
{
  PointerRNA scene_ptr, unit_settings;
  PropertyRNA *system_ptr, *scale_ptr;
  RNA_id_pointer_create(&sce.id, &scene_ptr);

  unit_settings = RNA_pointer_get(&scene_ptr, "unit_settings");
  system_ptr = RNA_struct_find_property(&unit_settings, "system");
  scale_ptr = RNA_struct_find_property(&unit_settings, "scale_length");

  int type = RNA_property_enum_get(&unit_settings, system_ptr);

  float bl_scale;

  switch (type) {
    case USER_UNIT_NONE:
      bl_scale = 1.0;  // map 1 Blender unit to 1 Meter
      break;

    case USER_UNIT_METRIC:
      bl_scale = RNA_property_float_get(&unit_settings, scale_ptr);
      break;

    default:
      bl_scale = RNA_property_float_get(&unit_settings, scale_ptr);
      // it looks like the conversion to Imperial is done implicitly.
      // So nothing to do here.
      break;
  }

  float rescale[3];
  rescale[0] = rescale[1] = rescale[2] = getLinearMeter() / bl_scale;

  size_to_mat4(scale_mat4, rescale);
}

/**
 * Translation map.
 * Used to translate every COLLADA id to a valid id, no matter what "wrong" letters may be
 * included. Look at the IDREF XSD declaration for more.
 * Follows strictly the COLLADA XSD declaration which explicitly allows non-english chars,
 * like special chars (e.g. micro sign), umlauts and so on.
 * The COLLADA spec also allows additional chars for member access ('.'), these
 * must obviously be removed too, otherwise they would be heavily misinterpreted.
 */
const unsigned char translate_start_name_map[256] = {

    95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,
    95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,
    95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,
    95,  95,  95,  95,  95,  95,  95,  95,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,
    76,  77,  78,  79,  80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  95,  95,  95,  95,
    95,  95,  97,  98,  99,  100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113,
    114, 115, 116, 117, 118, 119, 120, 121, 122, 95,  95,  95,  95,  95,

    128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146,
    147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165,
    166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184,
    185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203,
    204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222,
    223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241,
    242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255,
};

const unsigned char translate_name_map[256] = {

    95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,
    95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,  95,
    95,  95,  95,  95,  95,  95,  95,  45,  95,  95,  48,  49,  50,  51,  52,  53,  54,  55,  56,
    57,  95,  95,  95,  95,  95,  95,  95,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,
    76,  77,  78,  79,  80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  95,  95,  95,  95,
    95,  95,  97,  98,  99,  100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113,
    114, 115, 116, 117, 118, 119, 120, 121, 122, 95,  95,  95,  95,  95,

    128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146,
    147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165,
    166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184,
    185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203,
    204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222,
    223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241,
    242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255,
};

typedef std::map<std::string, std::vector<std::string>> map_string_list;
map_string_list global_id_map;

void clear_global_id_map()
{
  global_id_map.clear();
}

/** Look at documentation of translate_map */
std::string translate_id(const char *idString)
{
  std::string id = std::string(idString);
  return translate_id(id);
}

std::string translate_id(const std::string &id)
{
  if (id.size() == 0) {
    return id;
  }

  std::string id_translated = id;
  id_translated[0] = translate_start_name_map[(unsigned int)id_translated[0]];
  for (unsigned int i = 1; i < id_translated.size(); i++) {
    id_translated[i] = translate_name_map[(unsigned int)id_translated[i]];
  }
  // It's so much workload now, the if () should speed up things.
  if (id_translated != id) {
    // Search duplicates
    map_string_list::iterator iter = global_id_map.find(id_translated);
    if (iter != global_id_map.end()) {
      unsigned int i = 0;
      bool found = false;
      for (i = 0; i < iter->second.size(); i++) {
        if (id == iter->second[i]) {
          found = true;
          break;
        }
      }
      bool convert = false;
      if (found) {
        if (i > 0) {
          convert = true;
        }
      }
      else {
        convert = true;
        global_id_map[id_translated].push_back(id);
      }
      if (convert) {
        std::stringstream out;
        out << ++i;
        id_translated += out.str();
      }
    }
    else {
      global_id_map[id_translated].push_back(id);
    }
  }
  return id_translated;
}

std::string id_name(void *id)
{
  return ((ID *)id)->name + 2;
}

std::string encode_xml(std::string xml)
{
  const std::map<char, std::string> escape{
      {'<', "&lt;"}, {'>', "&gt;"}, {'"', "&quot;"}, {'\'', "&apos;"}, {'&', "&amp;"}};

  std::map<char, std::string>::const_iterator it;
  std::string encoded_xml = "";

  for (unsigned int i = 0; i < xml.size(); i++) {
    char c = xml.at(i);
    it = escape.find(c);

    if (it == escape.end()) {
      encoded_xml += c;
    }
    else {
      encoded_xml += it->second;
    }
  }
  return encoded_xml;
}

std::string get_geometry_id(Object *ob)
{
  return translate_id(id_name(ob->data)) + "-mesh";
}

std::string get_geometry_id(Object *ob, bool use_instantiation)
{
  std::string geom_name = (use_instantiation) ? id_name(ob->data) : id_name(ob);

  return translate_id(geom_name) + "-mesh";
}

std::string get_light_id(Object *ob)
{
  return translate_id(id_name(ob)) + "-light";
}

std::string get_joint_sid(Bone *bone)
{
  return translate_id(bone->name);
}
static std::string get_joint_sid(EditBone *bone)
{
  return translate_id(bone->name);
}

std::string get_camera_id(Object *ob)
{
  return translate_id(id_name(ob)) + "-camera";
}

std::string get_effect_id(Material *mat)
{
  return translate_id(id_name(mat)) + "-effect";
}

std::string get_material_id(Material *mat)
{
  return translate_id(id_name(mat)) + "-material";
}

std::string get_morph_id(Object *ob)
{
  return translate_id(id_name(ob)) + "-morph";
}
