/**
 * 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 collisionHandlerEvent.I
 * @author drose
 * @date 2002-03-16
 */

/**
 * Orders the CollisionEntries in the set so that there is one entry for each
 * node/node intersection detected.
 */
INLINE bool CollisionHandlerEvent::SortEntries::
operator () (const PT(CollisionEntry) &a,
             const PT(CollisionEntry) &b) const {
  int compare_from = a->get_from_node_path().compare_to(b->get_from_node_path());
  if (compare_from != 0) {
    return compare_from < 0;
  }
  return a->get_into_node_path() < b->get_into_node_path();
}

/**
 * The assignment operator does absolutely nothing, since this is just a
 * function object class that stores no data.  We define it just to quiet up
 * g++ in -Wall mode.
 */
INLINE void CollisionHandlerEvent::SortEntries::
operator = (const CollisionHandlerEvent::SortEntries &) {
}

/**
 * Removes all of the previously-added in patterns.  See add_in_pattern.
 */
INLINE void CollisionHandlerEvent::
clear_in_patterns() {
  _in_patterns.clear();
}

/**
 * Adds a pattern string to the list of events that will be generated in
 * response to a collision.  The pattern string describes how the event name
 * will be composed.  It is a string that may contain any of the following:
 *
 * %fn  - the name of the "from" object's node %in  - the name of the "into"
 * object's node %fs  - 't' if "from" is tangible, 'i' if intangible %is  -
 * 't' if "into" is tangible, 'i' if intangible %ig  - 'c' if the collision is
 * into a CollisionNode, 'g' if it is a geom.
 *
 * %(tag)fh - generate event only if "from" node has the indicated net tag.
 * %(tag)fx - generate event only if "from" node does not have the indicated
 * net tag.  %(tag)ih - generate event only if "into" node has the indicated
 * net tag.  %(tag)ix - generate event only if "into" node does not have the
 * indicated net tag.  %(tag)ft - the indicated net tag value of the "from"
 * node.  %(tag)it - the indicated net tag value of the "into" node.
 *
 * Parentheses in the above are literal and should be included in the actual
 * pattern.
 *
 * The event name will be based on the in_pattern string specified here, with
 * all occurrences of the above strings replaced with the corresponding
 * values.
 *
 * In general, the in_pattern event is thrown on the first detection of a
 * collision between two particular nodes.  In subsequent passes, as long as a
 * collision between those two nodes continues to be detected each frame, the
 * again_pattern is thrown.  The first frame in which the collision is no
 * longer detected, the out_pattern event is thrown.
 */
INLINE void CollisionHandlerEvent::
add_in_pattern(const std::string &in_pattern) {
  _in_patterns.push_back(in_pattern);
}

/**
 * This method is deprecated; it completely replaces all the in patterns that
 * have previously been set with the indicated pattern.
 */
INLINE void CollisionHandlerEvent::
set_in_pattern(const std::string &in_pattern) {
  clear_in_patterns();
  add_in_pattern(in_pattern);
}

/**
 * Returns the number of in pattern strings that have been added.
 */
INLINE int CollisionHandlerEvent::
get_num_in_patterns() const {
  return _in_patterns.size();
}

/**
 * Returns the nth pattern string that indicates how the event names are
 * generated for each collision detected.  See add_in_pattern().
 */
INLINE std::string CollisionHandlerEvent::
get_in_pattern(int n) const {
  nassertr(n >= 0 && n < (int)_in_patterns.size(), std::string());
  return _in_patterns[n];
}

/**
 * Removes all of the previously-added in patterns.  See add_again_pattern.
 */
INLINE void CollisionHandlerEvent::
clear_again_patterns() {
  _again_patterns.clear();
}

/**
 * Adds the pattern string that indicates how the event names are generated
 * when a collision between two particular nodes is *still* detected.  This
 * event is thrown each consecutive time a collision between two particular
 * nodes is detected, starting with the second time.
 *
 * In general, the in_pattern event is thrown on the first detection of a
 * collision between two particular nodes.  In subsequent passes, as long as a
 * collision between those two nodes continues to be detected each frame, the
 * again_pattern is thrown.  The first frame in which the collision is no
 * longer detected, the out_pattern event is thrown.
 */
INLINE void CollisionHandlerEvent::
add_again_pattern(const std::string &again_pattern) {
  _again_patterns.push_back(again_pattern);
}

/**
 * This method is deprecated; it completely replaces all the in patterns that
 * have previously been set with the indicated pattern.
 */
INLINE void CollisionHandlerEvent::
set_again_pattern(const std::string &again_pattern) {
  clear_again_patterns();
  add_again_pattern(again_pattern);
}

/**
 * Returns the number of in pattern strings that have been added.
 */
INLINE int CollisionHandlerEvent::
get_num_again_patterns() const {
  return _again_patterns.size();
}

/**
 * Returns the nth pattern string that indicates how the event names are
 * generated for each collision detected.  See add_again_pattern().
 */
INLINE std::string CollisionHandlerEvent::
get_again_pattern(int n) const {
  nassertr(n >= 0 && n < (int)_again_patterns.size(), std::string());
  return _again_patterns[n];
}

/**
 * Removes all of the previously-added in patterns.  See add_out_pattern.
 */
INLINE void CollisionHandlerEvent::
clear_out_patterns() {
  _out_patterns.clear();
}

/**
 * Adds the pattern string that indicates how the event names are generated
 * when a collision between two particular nodes is *no longer* detected.
 *
 * In general, the in_pattern event is thrown on the first detection of a
 * collision between two particular nodes.  In subsequent passes, as long as a
 * collision between those two nodes continues to be detected each frame, the
 * again_pattern is thrown.  The first frame in which the collision is no
 * longer detected, the out_pattern event is thrown.
 */
INLINE void CollisionHandlerEvent::
add_out_pattern(const std::string &out_pattern) {
  _out_patterns.push_back(out_pattern);
}

/**
 * This method is deprecated; it completely replaces all the in patterns that
 * have previously been set with the indicated pattern.
 */
INLINE void CollisionHandlerEvent::
set_out_pattern(const std::string &out_pattern) {
  clear_out_patterns();
  add_out_pattern(out_pattern);
}

/**
 * Returns the number of in pattern strings that have been added.
 */
INLINE int CollisionHandlerEvent::
get_num_out_patterns() const {
  return _out_patterns.size();
}

/**
 * Returns the nth pattern string that indicates how the event names are
 * generated for each collision detected.  See add_out_pattern().
 */
INLINE std::string CollisionHandlerEvent::
get_out_pattern(int n) const {
  nassertr(n >= 0 && n < (int)_out_patterns.size(), std::string());
  return _out_patterns[n];
}