/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file eggPrimitive.I
 * @author drose
 * @date 1999-01-16
 */

/**
 *
 */
INLINE EggPrimitive::
EggPrimitive(const std::string &name): EggNode(name) {
  _bface = false;
  _connected_shading = S_unknown;
}

/**
 *
 */
INLINE EggPrimitive::
EggPrimitive(const EggPrimitive &copy) :
  EggNode(copy),
  EggAttributes(copy),
  EggRenderMode(copy),
  _textures(copy._textures),
  _material(copy._material),
  _bface(copy._bface)
{
  copy_vertices(copy);
  _connected_shading = S_unknown;
}

/**
 *
 */
INLINE EggPrimitive &EggPrimitive::
operator = (const EggPrimitive &copy) {
  EggNode::operator = (copy);
  EggAttributes::operator = (copy);
  EggRenderMode::operator = (copy);
  copy_vertices(copy);
  _textures = copy._textures;
  _material = copy._material;
  _bface = copy._bface;
  _connected_shading = S_unknown;
  return *this;
}

/**
 *
 */
INLINE EggPrimitive::
~EggPrimitive() {
  clear();
}

/**
 * Returns the name of the primitive for the purposes of sorting primitives
 * into different groups, if there is one.
 *
 * Presently, this is defined as the primitive name itself, unless it begins
 * with a digit.
 */
INLINE std::string EggPrimitive::
get_sort_name() const {
  const std::string &name = get_name();
  if (!name.empty() && !isdigit(name[0])) {
    return name;
  }
  return std::string();
}

/**
 * Resets the connected_shading member in this primitive, so that
 * get_connected_shading() will recompute a new value.
 */
INLINE void EggPrimitive::
clear_connected_shading() {
  _connected_shading = S_unknown;
}

/**
 * Determines what sort of shading properties this primitive's connected
 * neighbors have.
 *
 * To get the most accurate results, you should first call
 * clear_connected_shading() on all connected primitives (or on all primitives
 * in the egg file). It might also be a good idea to call
 * remove_unused_vertices() to ensure proper connectivity.
 *
 * You may find it easiest to call these other methods on the EggData root
 * node (they are defined on EggGroupNode).
 */
INLINE EggPrimitive::Shading EggPrimitive::
get_connected_shading() const {
  if (_connected_shading == S_unknown) {
    ((EggPrimitive *)this)->set_connected_shading(S_unknown, this);
  }

  return _connected_shading;
}

/**
 * Replaces the current list of textures with the indicated texture.
 *
 * This method is deprecated and is used in support of single-texturing only.
 * Please use the multitexture variant add_texture instead.
 */
INLINE void EggPrimitive::
set_texture(EggTexture *texture) {
  clear_texture();
  add_texture(texture);
}

/**
 * Returns true if the primitive has any textures specified, false otherwise.
 *
 * This method is deprecated and is used in support of single-texturing only.
 * New code should be written to use the multitexture variants instead.
 */
INLINE bool EggPrimitive::
has_texture() const {
  return get_num_textures() > 0;
}

/**
 * Returns true if the primitive has the particular indicated texture, false
 * otherwise.
 */
INLINE bool EggPrimitive::
has_texture(EggTexture *texture) const {
  PT_EggTexture t = texture;
  return (std::find(_textures.begin(), _textures.end(), t) != _textures.end());
}

/**
 * Returns the first texture on the primitive, if any, or NULL if there are no
 * textures on the primitive.
 *
 * This method is deprecated and is used in support of single-texturing only.
 * New code should be written to use the multitexture variants instead.
 */
INLINE EggTexture *EggPrimitive::
get_texture() const {
  return has_texture() ? get_texture(0) : nullptr;
}

/**
 * Applies the indicated texture to the primitive.
 *
 * Note that, in the case of multiple textures being applied to a single
 * primitive, the order in which the textures are applied does not affect the
 * rendering order; use EggTexture::set_sort() to specify that.
 */
INLINE void EggPrimitive::
add_texture(EggTexture *texture) {
  _textures.push_back(texture);
}

/**
 * Removes any texturing from the primitive.
 */
INLINE void EggPrimitive::
clear_texture() {
  _textures.clear();
}

/**
 * Returns the number of textures applied to the primitive.
 */
INLINE int EggPrimitive::
get_num_textures() const {
  return _textures.size();
}

/**
 * Returns the nth texture that has been applied to the primitive.
 */
INLINE EggTexture *EggPrimitive::
get_texture(int n) const {
  nassertr(n >= 0 && n < (int)_textures.size(), nullptr);
  return _textures[n];
}


/**
 * Applies the indicated material to the primitive.
 */
INLINE void EggPrimitive::
set_material(EggMaterial *material) {
  _material = material;
}

/**
 * Removes any material from the primitive.
 */
INLINE void EggPrimitive::
clear_material() {
  _material = nullptr;
}

/**
 * Returns a pointer to the applied material, or NULL if there is no material
 * applied.
 */
INLINE EggMaterial *EggPrimitive::
get_material() const {
  return _material;
}


/**
 * Returns true if the primitive is materiald (and get_material() will return
 * a real pointer), false otherwise (and get_material() will return NULL).
 */
INLINE bool EggPrimitive::
has_material() const {
  return _material != nullptr;
}


/**
 * Sets the backfacing flag of the polygon.  If this is true, the polygon will
 * be rendered so that both faces are visible; if it is false, only the front
 * face of the polygon will be visible.
 */
INLINE void EggPrimitive::
set_bface_flag(bool flag) {
  _bface = flag;
}


/**
 * Retrieves the backfacing flag of the polygon.  See set_bface_flag().
 */
INLINE bool EggPrimitive::
get_bface_flag() const {
  return _bface;
}


/**
 *
 */
INLINE EggPrimitive::iterator EggPrimitive::
begin() const {
  return _vertices.begin();
}

/**
 *
 */
INLINE EggPrimitive::iterator EggPrimitive::
end() const {
  return _vertices.end();
}

/**
 *
 */
INLINE EggPrimitive::reverse_iterator EggPrimitive::
rbegin() const {
  return _vertices.rbegin();
}

/**
 *
 */
INLINE EggPrimitive::reverse_iterator EggPrimitive::
rend() const {
  return _vertices.rend();
}

/**
 *
 */
INLINE bool EggPrimitive::
empty() const {
  return _vertices.empty();
}

/**
 *
 */
INLINE EggPrimitive::size_type EggPrimitive::
size() const {
  return _vertices.size();
}

/**
 * This is read-only: you can't assign directly to an indexed vertex.  See
 * set_vertex() instead.
 */
INLINE EggVertex *EggPrimitive::
operator [] (int index) const {
  nassertr(index >= 0 && index < (int)size(), nullptr);
  return *(begin() + index);
}

/**
 *
 */
INLINE EggPrimitive::iterator EggPrimitive::
insert(iterator position, EggVertex *x) {
  prepare_add_vertex(x, position - _vertices.begin(), _vertices.size() + 1);
  iterator i = _vertices.insert((Vertices::iterator &)position, x);
  x->test_pref_integrity();
  test_vref_integrity();
  return i;
}

/**
 *
 */
INLINE EggPrimitive::iterator EggPrimitive::
erase(iterator position) {
  prepare_remove_vertex(*position, position - _vertices.begin(), _vertices.size());
  iterator i = _vertices.erase((Vertices::iterator &)position);
  test_vref_integrity();
  return i;
}

/**
 * Replaces the vertex at the indicated position with the indicated vertex.
 * It is an error to call this with an invalid position iterator (e.g.
 * end()).
 */
INLINE void EggPrimitive::
replace(iterator position, EggVertex *x) {
  nassertv(position != end());

  // We pass -1 for i and n so that EggCompositePrimitive won't try to adjust
  // its _components list.
  prepare_remove_vertex(*position, -1, -1);
  prepare_add_vertex(x, -1, -1);
  *(Vertices::iterator &)position = x;

  x->test_pref_integrity();
  test_vref_integrity();
}

/**
 * Removes all of the vertices from the primitive.
 */
INLINE void EggPrimitive::
clear() {
  erase(begin(), end());
}

/**
 *
 */
INLINE size_t EggPrimitive::
get_num_vertices() const {
  return size();
}

/**
 * Replaces a particular vertex based on its index number in the list of
 * vertices.  This is just a convenience function for people who don't want to
 * mess with the iterators.
 */
INLINE void EggPrimitive::
set_vertex(size_t index, EggVertex *vertex) {
  nassertv(index < size());
  replace(begin() + index, vertex);
}

/**
 * Inserts a vertex at the given position.
 */
INLINE void EggPrimitive::
insert_vertex(size_t index, EggVertex *vertex) {
  if (index > _vertices.size()) {
    index = _vertices.size();
  }
  _vertices.insert(_vertices.begin() + index, vertex);
}

/**
 * Returns a particular index based on its index number.
 */
INLINE EggVertex *EggPrimitive::
get_vertex(size_t index) const {
  nassertr(index < size(), nullptr);
  return *(begin() + index);
}

/**
 * Returns the vertex pool associated with the vertices of the primitive, or
 * NULL if the primitive has no vertices.
 */
INLINE EggVertexPool *EggPrimitive::
get_pool() const {
  return empty() ? nullptr : _vertices.front()->get_pool();
}