/* 
A* -------------------------------------------------------------------
B* This file contains source code for the PyMOL computer program
C* copyright 1998-2000 by Warren Lyford Delano of DeLano Scientific. 
D* -------------------------------------------------------------------
E* It is unlawful to modify or remove this copyright notice.
F* -------------------------------------------------------------------
G* Please see the accompanying LICENSE file for further information. 
H* -------------------------------------------------------------------
I* Additional authors of this source file include:
-* 
-* 
-*
Z* -------------------------------------------------------------------
*/
#include"os_python.h"

#include"os_predef.h"
#include"os_std.h"

#include"Base.h"
#include"OOMac.h"
#include"Vector.h"
#include"MemoryDebug.h"
#include"Err.h"
#include"Setting.h"
#include"Scene.h"
#include"Ray.h"
#include"ObjectDist.h"
#include"Selector.h"
#include"PConv.h"
#include"ObjectMolecule.h"
#include"Feedback.h"
#include"DistSet.h"
#include"ListMacros.h"

void ObjectDistFree(ObjectDist * I);
void ObjectDistUpdate(ObjectDist * I);
int ObjectDistGetNFrames(ObjectDist * I);
void ObjectDistUpdateExtents(ObjectDist * I);

int ObjectDistGetLabelTxfVertex(ObjectDist * I, int state, int index, float *v)
{
  int result = 0;
  if(I->DSet) {
    if(state < 0)
      state = SettingGet_i(I->Obj.G, NULL, I->Obj.Setting, cSetting_state) - 1;
    if(state < 0)
      state = SceneGetState(I->Obj.G);
    if(I->NDSet == 1)
      state = 0;                /* static singletons always active here it seems */
    state = state % I->NDSet;
    {
      DistSet *ds = I->DSet[state];
      if((!ds) && (SettingGet_b(I->Obj.G, I->Obj.Setting, NULL, cSetting_all_states))) {
        state = 0;
        ds = I->DSet[state];
      }
      if(ds) {
        result = DistSetGetLabelVertex(ds, index, v);
      }
    }
  }
  return (result);
}

int ObjectDistMoveLabel(ObjectDist * I, int state, int index, float *v, int mode, int log)
{
  int result = 0;
  DistSet *ds;
  /* determine which state we're using */
  if(state < 0)
    state = 0;
  if(I->NDSet == 1)
    state = 0;
  state = state % I->NDSet;
  if((!I->DSet[state])
     && (SettingGet_b(I->Obj.G, I->Obj.Setting, NULL, cSetting_all_states)))
    state = 0;
  /* find the corresponding distance set, for this state */
  ds = I->DSet[state];
  if(ds) {
    result = DistSetMoveLabel(I->DSet[state], index, v, mode);
    /* force this object to redraw itself; invalidate the Label's coordinates
     * with the new data set, ds */
    ds->fInvalidateRep(ds, cRepLabel, cRepInvCoord);
    /*      ExecutiveUpdateCoordDepends(I->Obj.G,I); */
  }
  return (result);
}


/* ObjectDistMoveWithObject -- updates the vertex positions of a distance measure
 *
 * PARAMS
 *   (ObjectDist*) I
 *     the object to update
 *   (ObjectMolecule*) O
 *     the object that moved, causing this function to be called
 * RETURNS
 *   (integer) 0=nothing moved; 1=something moved
 */
int ObjectDistMoveWithObject(ObjectDist * I, struct ObjectMolecule * O) {
  int result = 0, curResult = 0;
  int i;
  DistSet* ds;

  /* bail if the distance object is empty, or it doesn't have any distances */
  if (!I || !I->NDSet || !I->DSet ) {
    return 0;
  }

  /* ask each DistSet to move itself, if required */
  for (i=0; i<I->NDSet; i++) {
    ds = I->DSet[i];
    if (ds) {
      curResult = DistSetMoveWithObject(ds, O);
      result |= curResult;
    }
  }
	
  PRINTFD(I->Obj.G, FB_ObjectDist) " ObjectDist-Move: Out of Move\n" ENDFD;
  return result;
}
/* -- JV end */



		
static DistSet *ObjectDistGetDistSetFromM4XBond(PyMOLGlobals * G,
                                                ObjectMolecule * obj,
                                                M4XBondType * hb, int n_hb,
                                                int state, int nbr_sele)
{
  int min_id, max_id, range, *lookup = NULL;
  int nv = 0;
  float *vv = NULL;
  DistSet *ds;
  ds = DistSetNew(G);
  vv = VLAlloc(float, 10);

  /* this routine only works if IDs cover a reasonable range --
     should rewrite using a hash table */

  if(obj->NAtom) {

    /* determine range */

    {
      int a, cur_id;
      cur_id = obj->AtomInfo[0].id;
      min_id = cur_id;
      max_id = cur_id;
      for(a = 1; a < obj->NAtom; a++) {
        cur_id = obj->AtomInfo[a].id;
        if(min_id > cur_id)
          min_id = cur_id;
        if(max_id < cur_id)
          max_id = cur_id;
      }
    }

    /* create cross-reference table */

    {
      int a, offset;

      range = max_id - min_id + 1;
      lookup = Calloc(int, range);
      for(a = 0; a < obj->NAtom; a++) {
        offset = obj->AtomInfo[a].id - min_id;
        if(lookup[offset])
          lookup[offset] = -1;
        else {
          lookup[offset] = a + 1;
        }
      }
    }

    /* iterate through IDs and get pairs */
    {
      AtomInfoType *ai1, *ai2;
      int at1, at2;
      CoordSet *cs;

      float *vv0, *vv1, dist;
      int idx1, idx2;

      int i, offset1, offset2;
      int sele_flag = false;

      for(i = 0; i < n_hb; i++) {
        offset1 = hb[i].atom1 - min_id;
        offset2 = hb[i].atom2 - min_id;
        if((offset1 >= 0) && (offset1 < range) && (offset2 >= 0) && (offset2 < range)) {
          at1 = lookup[offset1] - 1;
          at2 = lookup[offset2] - 1;
          if((at1 >= 0) && (at2 >= 0) && (at1 != at2) && (state < obj->NCSet)) {
            cs = obj->CSet[state];

            if(cs) {
              ai1 = obj->AtomInfo + at1;
              ai2 = obj->AtomInfo + at2;

              sele_flag = false;

              if(nbr_sele >= 0) {
                if(SelectorIsMember(G, ai1->selEntry, nbr_sele))
                  sele_flag = true;
                if(SelectorIsMember(G, ai2->selEntry, nbr_sele))
                  sele_flag = true;
              } else {
                sele_flag = true;
              }

              if(sele_flag) {
                if(obj->DiscreteFlag) {
                  if(cs == obj->DiscreteCSet[at1]) {
                    idx1 = obj->DiscreteAtmToIdx[at1];
                  } else {
                    idx1 = -1;
                  }
                } else {
                  idx1 = cs->AtmToIdx[at1];
                }

                if(obj->DiscreteFlag) {
                  if(cs == obj->DiscreteCSet[at2]) {
                    idx2 = obj->DiscreteAtmToIdx[at2];
                  } else {
                    idx2 = -1;
                  }

                } else {
                  idx2 = cs->AtmToIdx[at2];
                }

                if((idx1 >= 0) && (idx2 >= 0)) {
                  dist = (float) diff3f(cs->Coord + 3 * idx1, cs->Coord + 3 * idx2);
                  VLACheck(vv, float, (nv * 3) + 5);
                  vv0 = vv + (nv * 3);
                  vv1 = cs->Coord + 3 * idx1;
                  *(vv0++) = *(vv1++);
                  *(vv0++) = *(vv1++);
                  *(vv0++) = *(vv1++);
                  vv1 = cs->Coord + 3 * idx2;
                  *(vv0++) = *(vv1++);
                  *(vv0++) = *(vv1++);
                  *(vv0++) = *(vv1++);
                  nv += 2;
                }
              }
            }
          }
        }
      }
    }
  }

  FreeP(lookup);
  ds->NIndex = nv;
  ds->Coord = vv;
  return (ds);

}

ObjectDist *ObjectDistNewFromM4XBond(PyMOLGlobals * G, ObjectDist * oldObj,
                                     struct ObjectMolecule * objMol,
                                     struct M4XBondType * hbond,
                                     int n_hbond, int nbr_sele)
{
  int a;
  ObjectDist *I;
  int n_state;
  if(!oldObj)
    I = ObjectDistNew(G);
  else {
    I = oldObj;
    for(a = 0; a < I->NDSet; a++)
      if(I->DSet[a]) {
        if(I->DSet[a]->fFree)
          I->DSet[a]->fFree(I->DSet[a]);
        I->DSet[a] = NULL;
      }
    I->NDSet = 0;
  }
  n_state = objMol->NCSet;
  for(a = 0; a < n_state; a++) {
    VLACheck(I->DSet, DistSet *, a);

    I->DSet[a] = ObjectDistGetDistSetFromM4XBond(G, objMol, hbond, n_hbond, a, nbr_sele);

    if(I->DSet[a]) {
      I->DSet[a]->Obj = I;
      I->NDSet = a + 1;
    }
  }
  ObjectDistUpdateExtents(I);

  SceneChanged(G);
  return (I);
}


/*========================================================================*/

void ObjectDistUpdateExtents(ObjectDist * I)
{
  float maxv[3] = { FLT_MAX, FLT_MAX, FLT_MAX };
  float minv[3] = { -FLT_MAX, -FLT_MAX, -FLT_MAX };
  int a;
  DistSet *ds;

  /* update extents */
  copy3f(maxv, I->Obj.ExtentMin);
  copy3f(minv, I->Obj.ExtentMax);
  I->Obj.ExtentFlag = false;
  for(a = 0; a < I->NDSet; a++) {
    ds = I->DSet[a];
    if(ds) {
      if(DistSetGetExtent(ds, I->Obj.ExtentMin, I->Obj.ExtentMax))
        I->Obj.ExtentFlag = true;
    }
  }
}

#ifndef _PYMOL_NOPY
static PyObject *ObjectDistDSetAsPyList(ObjectDist * I)
{
  PyObject *result = NULL;
  int a;
  result = PyList_New(I->NDSet);
  for(a = 0; a < I->NDSet; a++) {
    if(I->DSet[a]) {
      PyList_SetItem(result, a, DistSetAsPyList(I->DSet[a]));
    } else {
      PyList_SetItem(result, a, PConvAutoNone(Py_None));
    }
  }
  return (PConvAutoNone(result));
}
#endif
#ifndef _PYMOL_NOPY
static int ObjectDistDSetFromPyList(ObjectDist * I, PyObject * list)
{
  int ok = true;
  int a;
  if(ok)
    ok = PyList_Check(list);
  if(ok) {
    VLACheck(I->DSet, DistSet *, I->NDSet);
    for(a = 0; a < I->NDSet; a++) {
      if(ok)
        ok = DistSetFromPyList(I->Obj.G, PyList_GetItem(list, a), &I->DSet[a]);
      if(ok)
        I->DSet[a]->Obj = I;
    }
  }
  return (ok);
}
#endif

/*========================================================================*/
PyObject *ObjectDistAsPyList(ObjectDist * I)
{
#ifdef _PYMOL_NOPY
  return NULL;
#else

  PyObject *result = NULL;

  /* first, dump the atoms */

  result = PyList_New(4);
  PyList_SetItem(result, 0, ObjectAsPyList(&I->Obj));
  PyList_SetItem(result, 1, PyInt_FromLong(I->NDSet));
  PyList_SetItem(result, 2, ObjectDistDSetAsPyList(I));
  PyList_SetItem(result, 3, PyInt_FromLong(I->CurDSet));

  return (PConvAutoNone(result));
#endif
}

int ObjectDistNewFromPyList(PyMOLGlobals * G, PyObject * list, ObjectDist ** result)
{
#ifdef _PYMOL_NOPY
  return 0;
#else

  int ok = true;
  ObjectDist *I = NULL;
  (*result) = NULL;

  if(ok)
    ok = PyList_Check(list);

  I = ObjectDistNew(G);
  if(ok)
    ok = (I != NULL);

  if(ok)
    ok = ObjectFromPyList(G, PyList_GetItem(list, 0), &I->Obj);
  if(ok)
    ok = PConvPyIntToInt(PyList_GetItem(list, 1), &I->NDSet);
  if(ok)
    ok = ObjectDistDSetFromPyList(I, PyList_GetItem(list, 2));
  if(ok)
    ok = PConvPyIntToInt(PyList_GetItem(list, 3), &I->CurDSet);

  ObjectDistInvalidateRep(I, cRepAll);
  if(ok) {
    (*result) = I;
    ObjectDistUpdateExtents(I);
  } else {
    /* cleanup? */
  }

  return (ok);
#endif
}


/*========================================================================*/
int ObjectDistGetNFrames(ObjectDist * I)
{
  return I->NDSet;
}


/*========================================================================*/
void ObjectDistUpdate(ObjectDist * I)
{
  int a;
  OrthoBusyPrime(I->Obj.G);
  for(a = 0; a < I->NDSet; a++)
    if(I->DSet[a]) {
      OrthoBusySlow(I->Obj.G, a, I->NDSet);
      /*           printf(" ObjectDist: updating state %d of \"%s\".\n" , a+1, I->Obj.Name); */
      if(I->DSet[a]->fUpdate)
        I->DSet[a]->fUpdate(I->DSet[a], a);
    }
}


/*========================================================================*/
void ObjectDistInvalidateRep(ObjectDist * I, int rep)
{
  int a;
  PRINTFD(I->Obj.G, FB_ObjectDist)
    " ObjectDistInvalidateRep: entered.\n" ENDFD;

  for(a = 0; a < I->NDSet; a++)
    if(I->DSet[a]) {
      if(I->DSet[a]->fInvalidateRep)
        I->DSet[a]->fInvalidateRep(I->DSet[a], rep, cRepInvAll);
    }
}


/*========================================================================*/
static void ObjectDistRender(ObjectDist * I, RenderInfo * info)
{
  int a;
  int state = info->state;
  int pass = info->pass;
  CRay *ray = info->ray;

  if((pass == 0) || (pass == -1)) {
    ObjectPrepareContext(&I->Obj, ray);
    /* render all states */
    if(state < 0) {
      for(a = 0; a < I->NDSet; a++)
        if(I->DSet[a])
          if(I->DSet[a]->fRender)
            I->DSet[a]->fRender(I->DSet[a], info);
    } else if(state < I->NDSet) {
      /* if a specific state to render */
      I->CurDSet = state % I->NDSet;
      if(I->DSet[I->CurDSet]) {
        if(I->DSet[I->CurDSet]->fRender)
          I->DSet[I->CurDSet]->fRender(I->DSet[I->CurDSet], info);
      }
    } else if(I->NDSet == 1) {  /* if only one coordinate set, assume static */
      if(I->DSet[0]->fRender) {
        if(SettingGet_b(I->Obj.G, I->Obj.Setting, NULL, cSetting_static_singletons)) {
          I->DSet[0]->fRender(I->DSet[0], info);
        }
      }
    }
  }
}

static CSetting **ObjectDistGetSettingHandle(ObjectDist * I, int state)
{
  if(state < 0) {
    return (&I->Obj.Setting);
  } else if(state < I->NDSet) {
    if(I->DSet[state]) {
      return (&I->DSet[state]->Setting);
    } else {
      return (NULL);
    }
  } else {
    return (NULL);
  }
}

void ObjectDistInvalidate(CObject * Iarg, int rep, int level, int state){
  int a;
  ObjectDist * I = (ObjectDist*)Iarg;
  if(state < 0) {
    for(a = 0; a < I->NDSet; a++)
      if(I->DSet[a])
	if(I->DSet[a]->fInvalidateRep)
	  I->DSet[a]->fInvalidateRep(I->DSet[a], rep, level);
  } else if(state < I->NDSet) {
    /* if a specific state to render */
    I->CurDSet = state % I->NDSet;
    if(I->DSet[I->CurDSet]) {
      if(I->DSet[I->CurDSet]->fInvalidateRep)
	I->DSet[I->CurDSet]->fInvalidateRep(I->DSet[I->CurDSet], rep, level);
    }
  } else if(I->NDSet == 1) {  /* if only one coordinate set, assume static */
    if(I->DSet[0]->fInvalidateRep) {
      if(SettingGet_b(I->Obj.G, I->Obj.Setting, NULL, cSetting_static_singletons)) {
	I->DSet[0]->fInvalidateRep(I->DSet[0], rep, level);
      }
    }
  }
}

/*========================================================================*/
ObjectDist *ObjectDistNew(PyMOLGlobals * G)
{
  OOAlloc(G, ObjectDist);
  ObjectInit(G, (CObject *) I);
  I->Obj.type = cObjectMeasurement;
  I->DSet = VLACalloc(DistSet *, 10);  /* auto-zero */
  I->NDSet = 0;
  I->Obj.fRender = (void (*)(CObject *, RenderInfo * info)) ObjectDistRender;
  I->Obj.fFree = (void (*)(CObject *)) ObjectDistFree;
  I->Obj.fUpdate = (void (*)(CObject *)) ObjectDistUpdate;
  I->Obj.fInvalidate = (void (*)(CObject *, int, int, int)) ObjectDistInvalidate;
  I->Obj.fGetNFrame = (int (*)(CObject *)) ObjectDistGetNFrames;
  I->Obj.fGetSettingHandle = (CSetting ** (*)(CObject *, int state))
    ObjectDistGetSettingHandle;
  I->Obj.fDescribeElement = NULL;
  I->CurDSet = 0;
  I->Obj.Color = ColorGetIndex(G, "dash");
  return (I);
}


/*========================================================================*/
static void ObjectDistReset(PyMOLGlobals * G, ObjectDist * I)
{
	/* This wipes out all the distance sets and clears the state */
  int a;
  for(a = 0; a < I->NDSet; a++)
    if(I->DSet[a]) {
      if(I->DSet[a]->fFree)
        I->DSet[a]->fFree(I->DSet[a]);
      I->DSet[a] = NULL;
    }
  I->NDSet = 0;
  I->CurDSet = 0; /* -- JV */
}


/*========================================================================*/
ObjectDist *ObjectDistNewFromSele(PyMOLGlobals * G, ObjectDist * oldObj,
                                  int sele1, int sele2, int mode, float cutoff,
                                  int labels, int reset, float *result, int state)
{
  int a, mn;
  float dist_sum = 0.0, dist;
  int dist_cnt = 0;
  int n_state1, n_state2, state1 = 0, state2 = 0;
  int frozen1 = -1, frozen2 = -1;
  ObjectDist *I;
  
  CObject * query_obj = NULL;

  /* if the distance name we presented exists and is an object, just
   * overwrite it by resetting it; otherwise intialize the
   * objectDistance and its base class */
  if(!oldObj)
    I = ObjectDistNew(G);
  else {
    I = oldObj;
    if(reset)
      ObjectDistReset(G, I);
  }

  *result = 0.0;

  /* max number of states */
  mn = 0;
  SelectorUpdateTable(G, state, -1);

  /* here we determine the highest number of states with which we need to concern ourselves */
  n_state1 = SelectorGetSeleNCSet(G, sele1);
  n_state2 = SelectorGetSeleNCSet(G, sele2);
  /* take the larger state count */
  mn = (n_state2>n_state1) ? n_state2 : n_state1;

  /* updated state handling */
  /* determine the selected object */
  if(sele1 >= 0)
    query_obj = (CObject*) SelectorGetSingleObjectMolecule(G, sele1);
  if(query_obj) {
    frozen1 = SettingGetIfDefined_i(query_obj->G, query_obj->Setting, cSetting_state, &state1);
    if(frozen1) {
      state1--;
    }
  }

  if(sele2 >= 0)
    query_obj = (CObject*) SelectorGetSingleObjectMolecule(G, sele2);
  if(query_obj) {
    frozen2 = SettingGetIfDefined_i(query_obj->G, query_obj->Setting, cSetting_state, &state2);
    if(frozen2) {
      state2--;
    }
  }
  
  /* FIX for incorrectly handling state=-1 for multi-molecule selections */
  if(state1<0) state1=0;
  if(state2<0) state2=0;

  if(mn) {
    /* loop over the max number of states */
    for(a = 0; a < mn; a++) {

      /* the state param is valid, set it */
      if(state >= 0) {
        if(state >= mn)  /* bail */
          break;
        a = state;  /* otherwise, set a to state */
      }

      PRINTFB(G, FB_ObjectDist, FB_Blather)
	" ObjectDistNewFromSele: obj1 is frozen = %d into state %d+1\n", frozen1, state1 
	ENDFB(G);
      PRINTFB(G, FB_ObjectDist, FB_Blather) 
	" ObjectDistNewFromSele: obj1 is frozen = %d into state %d+1\n", frozen2, state2 
	ENDFB(G);

      VLACheck(I->DSet, DistSet *, a);
      if(!frozen1)
	state1 = (n_state1>1) ? a : 0;
      if(!frozen2)
	state2 = (n_state2>1) ? a : 0;

      /* this does the actual work of creating the distances for this state */
      /* I->DSet[a] = new DistSet(G, selections, states, etc) -- created this new DistSet */
      I->DSet[a] = SelectorGetDistSet(G, I->DSet[a], sele1, state1, sele2, state2, mode, cutoff, &dist);


      /* if the distances are valid, then tally the total and set the ObjectMolecule pointer as necessary */
      if(I->DSet[a]) {
        dist_sum += dist;	/* average distance over N states */
        dist_cnt++;
        I->DSet[a]->Obj = I;	/* point to the ObjectMolecule for this state's DistanceSet */
        I->NDSet = a + 1;
      }

      if(state >= 0 || (frozen1 && frozen2))
	break;
    }
  }
  /* set the object's bounds and redraw */
  ObjectDistUpdateExtents(I);
  ObjectDistInvalidateRep(I, cRepAll);

  /* return the avg dist */
  if(dist_cnt)
    (*result) = dist_sum / dist_cnt;

  SceneChanged(G);
  return (I);
}

ObjectDist *ObjectDistNewFromAngleSele(PyMOLGlobals * G, ObjectDist * oldObj,
                                       int sele1, int sele2, int sele3, int mode,
                                       int labels, float *result, int reset, int state)
{
  int a, mn;
  float angle_sum = 0.0;
  int angle_cnt = 0;
  int n_state1, n_state2, n_state3, state1, state2, state3;
  ObjectDist *I;

  int frozen1=-1, frozen2=-1, frozen3=-1;
  CObject * query_obj = NULL;
  if(!oldObj)                   /* create object if new */
    I = ObjectDistNew(G);
  else {                        /* otherwise, use existing object */
    I = oldObj;
    if(reset) {                 /* if reseting, then clear out all existing coordinate sets */
      ObjectDistReset(G, I);
    }
  }
  *result = 0.0;

  /* count number of states in each selection */

  SelectorUpdateTable(G, state, -1);
  n_state1 = SelectorGetSeleNCSet(G, sele1);
  n_state2 = SelectorGetSeleNCSet(G, sele2);
  n_state3 = SelectorGetSeleNCSet(G, sele3);

  /* figure out the total number of states */

  mn = n_state1;
  if(n_state2 > mn)
    mn = n_state2;
  if(n_state3 > mn)
    mn = n_state3;

  /* updated state handling */
  /* determine the selected object */
  if(sele1 >= 0)
    query_obj = (CObject*) SelectorGetSingleObjectMolecule(G, sele1);
  if(query_obj) {
    frozen1 = SettingGetIfDefined_i(query_obj->G, query_obj->Setting, cSetting_state, &state1);
    state1--;
  }
  /* updated state handling */
  /* determine the selected object */
  if(sele2 >= 0)
    query_obj = (CObject*) SelectorGetSingleObjectMolecule(G, sele2);
  if(query_obj) {
    frozen2 = SettingGetIfDefined_i(query_obj->G, query_obj->Setting, cSetting_state, &state2);
    state2--;
  }
  /* updated state handling */
  /* determine the selected object */
  if(sele3 >= 0)
    query_obj = (CObject*) SelectorGetSingleObjectMolecule(G, sele3);
  if(query_obj) {
    frozen3 = SettingGetIfDefined_i(query_obj->G, query_obj->Setting, cSetting_state, &state3);
    state3--;
  }

  if(mn) {
    for(a = 0; a < mn; a++) {
      if(state >= 0) {
        if(state > mn)
          break;
        a = state;
      }
      /* treat selections with one state as static singletons */

      PRINTFB(G, FB_ObjectDist, FB_Blather)
	" ObjectDistNewFromAngleSele: obj1 is frozen = %d into state %d+1\n", frozen1, state1 
	ENDFD;
      PRINTFB(G, FB_ObjectDist, FB_Blather) 
	" ObjectDistNewFromAngleSele: obj2 is frozen = %d into state %d+1\n", frozen2, state2 
	ENDFD;
      PRINTFB(G, FB_ObjectDist, FB_Blather) 
	" ObjectDistNewFromAngleSele: obj3 is frozen = %d into state %d+1\n", frozen3, state3
	ENDFD;

      if(!frozen1)
	state1 = (n_state1>1) ? a : 0;
      if(!frozen2)
	state2 = (n_state2>1) ? a : 0;
      if(!frozen3)
	state3 = (n_state3>1) ? a : 0;

      VLACheck(I->DSet, DistSet *, a+1);
      I->DSet[a] = SelectorGetAngleSet(G, I->DSet[a], sele1, state1, sele2,
                                       state2, sele3, state3, mode, &angle_sum,
                                       &angle_cnt);

      if(I->DSet[a]) {
        I->DSet[a]->Obj = I;
        if(I->NDSet <= a)
          I->NDSet = a + 1;
      }
      if(state >= 0 || (frozen1 && frozen2 && frozen3))
        break;
    }
  }
  /* else {
     VLAFreeP(I->DSet);
     OOFreeP(I);
     }
   */
  ObjectDistUpdateExtents(I);
  ObjectDistInvalidateRep(I, cRepAll);
  if(angle_cnt)
    (*result) = angle_sum / angle_cnt;

  SceneChanged(G);
  return (I);
}

ObjectDist *ObjectDistNewFromDihedralSele(PyMOLGlobals * G, ObjectDist * oldObj,
                                          int sele1, int sele2, int sele3, int sele4,
                                          int mode, int labels, float *result,
                                          int reset, int state)
{
  int a, mn;
  float angle_sum = 0.0;
  int angle_cnt = 0;
  int n_state1, n_state2, n_state3, n_state4, state1, state2, state3, state4;
  ObjectDist *I;

  int frozen1=-1, frozen2=-1, frozen3=-1, frozen4=-1;
  CObject * query_obj = NULL;

  if(!oldObj)                   /* create object if new */
    I = ObjectDistNew(G);
  else {                        /* otherwise, use existing object */
    I = oldObj;
    if(reset) {                 /* if reseting, then clear out all existing coordinate sets */
      ObjectDistReset(G, I);
    }
  }
  *result = 0.0;

  /* count number of states in each selection */

  SelectorUpdateTable(G, state, -1);

  n_state1 = SelectorGetSeleNCSet(G, sele1);
  n_state2 = SelectorGetSeleNCSet(G, sele2);
  n_state3 = SelectorGetSeleNCSet(G, sele3);
  n_state4 = SelectorGetSeleNCSet(G, sele4);

  /* figure out the total number of states */

  mn = n_state1;
  if(n_state2 > mn)
    mn = n_state2;
  if(n_state3 > mn)
    mn = n_state3;
  if(n_state4 > mn)
    mn = n_state4;

  /* updated state handling */
  /* determine the selected object */
  if(sele1 >= 0)
    query_obj = (CObject*) SelectorGetSingleObjectMolecule(G, sele1);
  if(query_obj) {
    frozen1 = SettingGetIfDefined_i(query_obj->G, query_obj->Setting, cSetting_state, &state1);
    state1--;
  }
  /* updated state handling */
  /* determine the selected object */
  if(sele2 >= 0)
    query_obj = (CObject*) SelectorGetSingleObjectMolecule(G, sele2);
  if(query_obj) {
    frozen2 = SettingGetIfDefined_i(query_obj->G, query_obj->Setting, cSetting_state, &state2);
    state2--;
  }
  /* updated state handling */
  /* determine the selected object */
  if(sele3 >= 0)
    query_obj = (CObject*) SelectorGetSingleObjectMolecule(G, sele3);
  if(query_obj) {
    frozen3 = SettingGetIfDefined_i(query_obj->G, query_obj->Setting, cSetting_state, &state3);
    state3--;
  }
  /* updated state handling */
  /* determine the selected object */
  if(sele4 >= 0)
    query_obj = (CObject*) SelectorGetSingleObjectMolecule(G, sele4);
  if(query_obj) {
    frozen4 = SettingGetIfDefined_i(query_obj->G, query_obj->Setting, cSetting_state, &state4);
    state4--;
  }

  if(mn) {
    for(a = 0; a < mn; a++) {
      if(state >= 0) {
        if(state > mn)
          break;
        a = state;
      }
      /* treat selections with one state as static singletons */

      if(!frozen1)
	state1 = (n_state1>1) ? a : 0;
      if(!frozen2)
	state2 = (n_state2>1) ? a : 0;
      if(!frozen3)
	state3 = (n_state3>1) ? a : 0;
      if(!frozen4)
	state4 = (n_state4>1) ? a : 0;

      VLACheck(I->DSet, DistSet *, a);
      I->DSet[a] = SelectorGetDihedralSet(G, I->DSet[a], sele1, state1, sele2,
                                          state2, sele3, state3, sele4, state4,
                                          mode, &angle_sum, &angle_cnt);

      if(I->DSet[a]) {
        I->DSet[a]->Obj = I;
        if(I->NDSet <= a)
          I->NDSet = a + 1;
      }

      if(state >= 0 || (frozen1 && frozen2 && frozen3 && frozen4))
        break;
    }
  }
  /* else {
     VLAFreeP(I->DSet);
     OOFreeP(I);
     }
   */
  ObjectDistUpdateExtents(I);
  ObjectDistInvalidateRep(I, cRepAll);

  if(angle_cnt)
    (*result) = angle_sum / angle_cnt;

  SceneChanged(G);
  return (I);
}


/*========================================================================*/
void ObjectDistFree(ObjectDist * I)
{
  int a;
  SceneObjectDel(I->Obj.G, (CObject *) I, false);
  for(a = 0; a < I->NDSet; a++)
    if(I->DSet[a]) {
      if(I->DSet[a]->fFree)
        I->DSet[a]->fFree(I->DSet[a]);
      I->DSet[a] = NULL;
    }
  VLAFreeP(I->DSet);
  ObjectPurge(&I->Obj);
  OOFreeP(I); /* from OOAlloc */
}