/* SPDX-License-Identifier: GPL-2.0-or-later
 * Copyright 2020 Blender Foundation. All rights reserved. */

/** \file
 * \ingroup intern_rigidbody
 */

#include "LinearMath/btConvexHullComputer.h"
#include "RBI_hull_api.h"

plConvexHull plConvexHullCompute(float (*coords)[3], int count)
{
  btConvexHullComputer *computer = new btConvexHullComputer;
  computer->compute(reinterpret_cast<float *>(coords), sizeof(*coords), count, 0, 0);
  return reinterpret_cast<plConvexHull>(computer);
}

void plConvexHullDelete(plConvexHull hull)
{
  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
  delete computer;
}

int plConvexHullNumVertices(plConvexHull hull)
{
  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
  return computer->vertices.size();
}

int plConvexHullNumLoops(plConvexHull hull)
{
  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
  return computer->edges.size();
}

int plConvexHullNumFaces(plConvexHull hull)
{
  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
  return computer->faces.size();
}

void plConvexHullGetVertex(plConvexHull hull, int n, float coords[3], int *original_index)
{
  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
  const btVector3 &v(computer->vertices[n]);
  coords[0] = v[0];
  coords[1] = v[1];
  coords[2] = v[2];
  (*original_index) = computer->original_vertex_index[n];
}

void plConvexHullGetLoop(plConvexHull hull, int n, int *v_from, int *v_to)
{
  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
  (*v_from) = computer->edges[n].getSourceVertex();
  (*v_to) = computer->edges[n].getTargetVertex();
}

int plConvexHullGetReversedLoopIndex(plConvexHull hull, int n)
{
  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
  return computer->edges[n].getReverseEdge() - &computer->edges[0];
}

int plConvexHullGetFaceSize(plConvexHull hull, int n)
{
  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
  const btConvexHullComputer::Edge *e_orig, *e;
  int count;

  for (e_orig = &computer->edges[computer->faces[n]], e = e_orig, count = 0;
       count == 0 || e != e_orig;
       e = e->getNextEdgeOfFace(), count++) {
    ;
  }
  return count;
}

void plConvexHullGetFaceLoops(plConvexHull hull, int n, int *loops)
{
  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
  const btConvexHullComputer::Edge *e_orig, *e;
  int count;

  for (e_orig = &computer->edges[computer->faces[n]], e = e_orig, count = 0;
       count == 0 || e != e_orig;
       e = e->getNextEdgeOfFace(), count++) {
    loops[count] = e - &computer->edges[0];
  }
}

void plConvexHullGetFaceVertices(plConvexHull hull, int n, int *vertices)
{
  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
  const btConvexHullComputer::Edge *e_orig, *e;
  int count;

  for (e_orig = &computer->edges[computer->faces[n]], e = e_orig, count = 0;
       count == 0 || e != e_orig;
       e = e->getNextEdgeOfFace(), count++) {
    vertices[count] = e->getTargetVertex();
  }
}