/*
  This file is part of CDO. CDO is a collection of Operators to
  manipulate and analyse Climate model Data.

  Copyright (C) 2006 Brockmann Consult
  See COPYING file for copying and redistribution conditions.

  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; version 2 of the License.

  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.
*/

#include <assert.h>
#include <string.h>

#include <cdi.h>
#include "cdo.h"
#include "cdo_int.h"
#include "grid.h"
#include "pstream.h"
#include "ecacore.h"
#include "ecautil.h"

#define FIRST_VAR_ID 0

#define IS_NOT_SET(x) (x == NULL)
#define IS_SET(x)     (x != NULL)


void eca1(const ECA_REQUEST_1 *request)
{
  const int operatorID = cdoOperatorID();
  
  int cmplen;
  char indate1[DATE_LEN+1], indate2[DATE_LEN+1];
  int gridsize;
  int ivdate = 0, ivtime = 0;
  int ovdate = 0, ovtime = 0;
  int nrecs, nrecords;
  int gridID, zaxisID, varID, levelID, recID;
  int itsID;
  int otsID;
  long nsets;
  int i;
  int istreamID, ostreamID;
  int ivlistID, ovlistID, itaxisID, otaxisID;
  int nlevels;
  int *recVarID, *recLevelID;
  double missval;
  field_t *var12 = NULL, *samp1 = NULL, *samp2 = NULL, *var13 = NULL, *var21 = NULL, *var23 = NULL, *var;
  field_t field1, field2;
  
  cmplen = DATE_LEN - cdoOperatorF2(operatorID);

  istreamID = streamOpenRead(cdoStreamName(0));

  ivlistID = streamInqVlist(istreamID);
  ovlistID = vlistCreate();
  
  gridID  = vlistInqVarGrid(ivlistID, FIRST_VAR_ID);
  zaxisID = vlistInqVarZaxis(ivlistID, FIRST_VAR_ID);
  missval = vlistInqVarMissval(ivlistID, FIRST_VAR_ID);

  varID   = vlistDefVar(ovlistID, gridID, zaxisID, TSTEP_INSTANT);

  vlistDefVarMissval(ovlistID, varID, missval);
  
  if ( IS_SET(request->var1.name) )
    vlistDefVarName(ovlistID, varID, request->var1.name);
  if ( IS_SET(request->var1.longname) ) 
    vlistDefVarLongname(ovlistID, varID, request->var1.longname);
  if ( IS_SET(request->var1.units) ) 
    vlistDefVarUnits(ovlistID, varID, request->var1.units);

  if ( IS_SET(request->var2.h2) || IS_SET(request->var2.h3) )
    {
      varID = vlistDefVar(ovlistID, gridID, zaxisID, TSTEP_INSTANT);
  
      vlistDefVarMissval(ovlistID, varID, missval);

      if ( IS_SET(request->var2.name) ) 
        vlistDefVarName(ovlistID, varID, request->var2.name);
      if ( IS_SET(request->var2.longname) ) 
        vlistDefVarLongname(ovlistID, varID, request->var2.longname);
      if ( IS_SET(request->var2.units) ) 
        vlistDefVarUnits(ovlistID, varID, request->var2.units);
    }
    
  if ( cdoOperatorF2(operatorID) == 16 ) vlistDefNtsteps(ovlistID, 1);

  itaxisID = vlistInqTaxis(ivlistID);
  otaxisID = taxisCreate(TAXIS_RELATIVE);
  taxisDefTunit(otaxisID, TUNIT_MINUTE);
  //  taxisDefCalendar(otaxisID, CALENDAR_PROLEPTIC);
  taxisDefCalendar(otaxisID, taxisInqCalendar(itaxisID));
  taxisDefRdate(otaxisID, 19550101);
  taxisDefRtime(otaxisID, 0);
  vlistDefTaxis(ovlistID, otaxisID);

  ostreamID = streamOpenWrite(cdoStreamName(1), cdoFiletype());

  streamDefVlist(ostreamID, ovlistID);

  nrecords   = vlistNrecs(ivlistID);
  recVarID   = (int*) Malloc(nrecords*sizeof(int));
  recLevelID = (int*) Malloc(nrecords*sizeof(int));

  gridsize = gridInqSize(gridID);

  field_init(&field1);
  field_init(&field2);

  field1.ptr = (double*) Malloc(gridsize*sizeof(double));
  if ( IS_SET(request->var2.h2) || IS_SET(request->var2.h3) ) 
    field2.ptr = (double*) Malloc(gridsize*sizeof(double));
  else
    field2.ptr = NULL;

  nlevels = zaxisInqSize(zaxisID);

  var12 = (field_t*) Malloc(nlevels*sizeof(field_t));
  samp1 = (field_t*) Malloc(nlevels*sizeof(field_t));
  samp2 = (field_t*) Malloc(nlevels*sizeof(field_t));
  if ( IS_SET(request->var1.f3) ) 
    var13 = (field_t*) Malloc(nlevels*sizeof(field_t));
    
  if ( IS_SET(request->var2.h2) ) 
    var21 = (field_t*) Malloc(nlevels*sizeof(field_t));
  if ( IS_SET(request->var2.h3) ) 
    var23 = (field_t*) Malloc(nlevels*sizeof(field_t));
      
  for ( levelID = 0; levelID < nlevels; levelID++ )
    {
      field_init(&var12[levelID]);
      var12[levelID].grid    = gridID;
      var12[levelID].nmiss   = 0;
      var12[levelID].missval = missval;
      var12[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));

      field_init(&samp1[levelID]);
      samp1[levelID].grid    = gridID;
      samp1[levelID].nmiss   = 0;
      samp1[levelID].missval = missval;
      samp1[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));

      field_init(&samp2[levelID]);
      samp2[levelID].grid    = gridID;
      samp2[levelID].nmiss   = 0;
      samp2[levelID].missval = missval;
      samp2[levelID].ptr     = NULL;

      if ( IS_SET(request->var1.f3) )
        {
	  field_init(&var13[levelID]);
          var13[levelID].grid    = gridID;
          var13[levelID].nmiss   = 0;
          var13[levelID].missval = missval;
          var13[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));
        }
      if ( IS_SET(request->var2.h2) )
        {
	  field_init(&var21[levelID]);
          var21[levelID].grid    = gridID;
          var21[levelID].nmiss   = 0;
          var21[levelID].missval = missval;
          var21[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));
        }
      if ( IS_SET(request->var2.h3) )
        {
	  field_init(&var23[levelID]);
          var23[levelID].grid    = gridID;
          var23[levelID].nmiss   = 0;
          var23[levelID].missval = missval;
          var23[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));
        }
    }

  itsID   = 0;
  otsID   = 0;
  while ( TRUE )
    {
      nsets = 0;
      while ( (nrecs = streamInqTimestep(istreamID, itsID)) > 0 )
        {
          ivdate = taxisInqVdate(itaxisID);
          ivtime = taxisInqVtime(itaxisID);

	  if ( nsets == 0 ) SET_DATE(indate2, ivdate, ivtime);
	  SET_DATE(indate1, ivdate, ivtime);

	  if ( DATE_IS_NEQ(indate1, indate2, cmplen) ) break;

          for ( recID = 0; recID < nrecs; recID++ )
            {
              streamInqRecord(istreamID, &varID, &levelID);

              if ( itsID == 0 )
                {
                  recVarID[recID]   = varID;
                  recLevelID[recID] = levelID;
                }
              if ( varID != FIRST_VAR_ID ) continue;

              if ( nsets == 0 )
                {
                  for ( i = 0; i < gridsize; i++ )
                    {
                      var12[levelID].ptr[i] = missval;
                      samp1[levelID].ptr[i] = missval;
                      if ( IS_SET(samp2[levelID].ptr) ) samp2[levelID].ptr[i] = 0.0;
                      if ( IS_SET(request->var1.f3) ) var13[levelID].ptr[i] = missval;
                      if ( IS_SET(request->var2.h2) ) var21[levelID].ptr[i] = missval;
                      if ( IS_SET(request->var2.h3) ) var23[levelID].ptr[i] = missval;
                    }
                  var12[levelID].nmiss = gridsize;
                  samp1[levelID].nmiss = gridsize;
                  if ( IS_SET(request->var1.f3) ) var13[levelID].nmiss = gridsize;
                  if ( IS_SET(request->var2.h2) ) var21[levelID].nmiss = gridsize; 
                  if ( IS_SET(request->var2.h3) ) var23[levelID].nmiss = gridsize; 
                }

              streamReadRecord(istreamID, field1.ptr, &field1.nmiss);
              field1.grid    = var12[levelID].grid;
              field1.missval = var12[levelID].missval;
              
              farnum(&samp1[levelID], field1);

              if ( IS_SET(request->var2.h2) )
                {
                  memcpy(field2.ptr, field1.ptr, gridsize*sizeof(double));
                  field2.nmiss   = field1.nmiss;
                  field2.grid    = field1.grid;
                  field2.missval = field1.missval;
                }
		
              if ( IS_SET(request->var1.f1) ) 
                request->var1.f1(&field1, request->var1.f1arg);

              if ( field1.nmiss > 0 || IS_SET(samp2[levelID].ptr) )
                {
                  if ( IS_NOT_SET(samp2[levelID].ptr) )
                    {
                      samp2[levelID].ptr = (double*) Malloc(gridsize*sizeof(double));
                      for ( i = 0; i < gridsize; i++ )
                        samp2[levelID].ptr[i] = nsets;
                    }
                  for ( i = 0; i < gridsize; i++ )
                    {
                      if ( DBL_IS_EQUAL(field1.ptr[i], field1.missval) )
                        continue;
                      samp2[levelID].ptr[i]++;
                    }
                }
              
              if ( IS_NOT_EQUAL(request->var1.mulc, 0.0) )
                farcmul(&field1, request->var1.mulc);
              if ( IS_NOT_EQUAL(request->var1.addc, 0.0) )
                farcadd(&field1, request->var1.addc);
                
              request->var1.f2(&var12[levelID], field1);
              
              if ( IS_SET(request->var2.h2) || IS_SET(request->var2.h3) )
                { 
                  /* if h2 is null, use the output of f2 as input for h1 */
                  if ( IS_NOT_SET(request->var2.h2) )
                    {
                      memcpy(field2.ptr, var12[levelID].ptr, gridsize*sizeof(double));
                      field2.nmiss   = var12[levelID].nmiss;
                      field2.grid    = var12[levelID].grid;
                      field2.missval = var12[levelID].missval;
                    }
                  
                  if ( IS_SET(request->var2.h1) ) 
                    request->var2.h1(&field2, request->var2.h1arg);
                        
                  if ( IS_NOT_SET(request->var2.h2) )    
                    request->var2.h3(&var23[levelID], field2);
                  else
                    {
                      request->var2.h2(&var21[levelID], field2);
                      if ( IS_SET(request->var2.h3) )
                        request->var2.h3(&var23[levelID], var21[levelID]);
                    }
                }

              if ( IS_SET(request->var1.f3) )
                request->var1.f3(&var13[levelID], var12[levelID]);
            }

          ovdate = ivdate;
          ovtime = ivtime;
          nsets++;
          itsID++;
        }

      if ( nrecs == 0 && nsets == 0 ) break;
      
      if ( request->var1.epilog == MEAN || request->var1.epilog == PERCENT_OF_TIME )
        for ( levelID = 0; levelID < nlevels; levelID++ )
          {
            if ( IS_SET(request->var1.f3) )
              var = &var13[levelID];
            else 
              var = &var12[levelID];
              
            if ( IS_NOT_SET(samp2[levelID].ptr) )
              farcdiv(var, nsets);
            else
              fardiv(var, samp2[levelID]);
              
            if ( request->var1.epilog == PERCENT_OF_TIME )
              farcmul(var, 100.0);
          }

      taxisDefVdate(otaxisID, ovdate);
      taxisDefVtime(otaxisID, ovtime);
      streamDefTimestep(ostreamID, otsID);

      if ( otsID && vlistInqVarTsteptype(ivlistID, FIRST_VAR_ID) == TSTEP_CONSTANT ) continue;

      varID = 0;
      for ( levelID = 0; levelID < nlevels; levelID++ )
	{
	  if ( IS_SET(request->var1.f3) )
	    var = &var13[levelID];
	  else 
	    var = &var12[levelID];

	  farsel(var, samp1[levelID]);

	  streamDefRecord(ostreamID, varID, levelID);
	  streamWriteRecord(ostreamID, var->ptr, var->nmiss);
	}

      if ( IS_SET(request->var2.h2) || IS_SET(request->var2.h3) )
	{
	  varID = 1;
	  for ( levelID = 0; levelID < nlevels; levelID++ )
	    {
	      if ( IS_SET(request->var2.h3) )
		var = &var23[levelID];
	      else 
		var = &var21[levelID];
                  
	      farsel(var, samp1[levelID]);
                  
	      streamDefRecord(ostreamID, varID, levelID);
	      streamWriteRecord(ostreamID, var->ptr, var->nmiss);
	    }
        }

      if ( nrecs == 0 ) break;
      otsID++;
    }

  for ( levelID = 0; levelID < nlevels; levelID++ )
    {
      Free(var12[levelID].ptr);
      Free(samp1[levelID].ptr);
      if ( IS_SET(samp2[levelID].ptr) ) Free(samp2[levelID].ptr);
    }  
  Free(var12);
  Free(samp1);
  Free(samp2);
  
  if ( IS_SET(var13) ) 
    {
      for ( levelID = 0; levelID < nlevels; levelID++ )
        Free(var13[levelID].ptr);
      Free(var13);
    }
  if ( IS_SET(var21) ) 
    {
      for ( levelID = 0; levelID < nlevels; levelID++ )
        Free(var21[levelID].ptr);
      Free(var21);
    }
  if ( IS_SET(var23) ) 
    {
      for ( levelID = 0; levelID < nlevels; levelID++ )
        Free(var23[levelID].ptr);
      Free(var23);
    }
    
  if ( IS_SET(field1.ptr) ) Free(field1.ptr);
  if ( IS_SET(field2.ptr) ) Free(field2.ptr);

  if ( IS_SET(recVarID) )   Free(recVarID);
  if ( IS_SET(recLevelID) ) Free(recLevelID);

  streamClose(ostreamID);
  streamClose(istreamID);
}


void eca2(const ECA_REQUEST_2 *request)
{
  const int operatorID = cdoOperatorID();
  
  int cmplen;
  char indate1[DATE_LEN+1], indate2[DATE_LEN+1];
  int gridsize;
  int ivdate = 0, ivtime = 0;
  int ovdate = 0, ovtime = 0;
  int nrecs, nrecords;
  int gridID, zaxisID, varID, levelID, recID;
  int itsID;
  int otsID;
  long nsets;
  int i;
  int istreamID1, istreamID2, ostreamID;
  int ivlistID1, ivlistID2, ovlistID, itaxisID1, otaxisID;
  int nlevels;
  int *recVarID, *recLevelID;
  double missval1, missval2;
  field_t *var14 = NULL, *samp1 = NULL, *samp2 = NULL, *samp3 = NULL, *total = NULL, *var15 = NULL, *var22 = NULL, *var;
  field_t field1, field2;
  
  cmplen = DATE_LEN - cdoOperatorF2(operatorID);

  istreamID1 = streamOpenRead(cdoStreamName(0));
  istreamID2 = streamOpenRead(cdoStreamName(1));

  ivlistID1 = streamInqVlist(istreamID1);
  ivlistID2 = streamInqVlist(istreamID2);
  ovlistID  = vlistCreate();
  
  vlistCompare(ivlistID1, ivlistID2, CMP_ALL);
  
  gridID  = vlistInqVarGrid(ivlistID1, FIRST_VAR_ID);
  zaxisID = vlistInqVarZaxis(ivlistID1, FIRST_VAR_ID);
  missval1 = vlistInqVarMissval(ivlistID1, FIRST_VAR_ID);
  missval2 = vlistInqVarMissval(ivlistID2, FIRST_VAR_ID);

  varID   = vlistDefVar(ovlistID, gridID, zaxisID, TSTEP_INSTANT);
  
  vlistDefVarMissval(ovlistID, varID, missval1);

  if ( IS_SET(request->var1.name) ) 
    vlistDefVarName(ovlistID, varID, request->var1.name);
  if ( IS_SET(request->var1.longname) ) 
    vlistDefVarLongname(ovlistID, varID, request->var1.longname);
  if ( IS_SET(request->var1.units) ) 
    vlistDefVarUnits(ovlistID, varID, request->var1.units);

  if ( IS_SET(request->var2.h2) )
    {
      varID = vlistDefVar(ovlistID, gridID, zaxisID, TSTEP_INSTANT);
  
      vlistDefVarMissval(ovlistID, varID, missval1);

      if ( IS_SET(request->var2.name) ) 
        vlistDefVarName(ovlistID, varID, request->var2.name);
      if ( IS_SET(request->var2.longname) ) 
        vlistDefVarLongname(ovlistID, varID, request->var2.longname);
      if ( IS_SET(request->var2.units) ) 
        vlistDefVarUnits(ovlistID, varID, request->var2.units);
    }

  if ( cdoOperatorF2(operatorID) == 16 ) vlistDefNtsteps(ovlistID, 1);

  itaxisID1 = vlistInqTaxis(ivlistID1);
  otaxisID = taxisCreate(TAXIS_RELATIVE);
  taxisDefTunit(otaxisID, TUNIT_MINUTE);
  //  taxisDefCalendar(otaxisID, CALENDAR_PROLEPTIC);
  taxisDefCalendar(otaxisID, taxisInqCalendar(itaxisID1));
  taxisDefRdate(otaxisID, 19550101);
  taxisDefRtime(otaxisID, 0);
  vlistDefTaxis(ovlistID, otaxisID);

  ostreamID = streamOpenWrite(cdoStreamName(2), cdoFiletype());

  streamDefVlist(ostreamID, ovlistID);

  nrecords   = vlistNrecs(ivlistID1);
  recVarID   = (int*) Malloc(nrecords*sizeof(int));
  recLevelID = (int*) Malloc(nrecords*sizeof(int));

  gridsize = gridInqSize(gridID);

  field_init(&field1);
  field_init(&field2);
  field1.ptr = (double*) Malloc(gridsize*sizeof(double));
  field2.ptr = (double*) Malloc(gridsize*sizeof(double));

  nlevels = zaxisInqSize(zaxisID);
  
  var14 = (field_t*) Malloc(nlevels*sizeof(field_t));
  samp1 = (field_t*) Malloc(nlevels*sizeof(field_t));
  samp2 = (field_t*) Malloc(nlevels*sizeof(field_t));
  samp3 = (field_t*) Malloc(nlevels*sizeof(field_t));
  
  if ( request->var1.epilog == PERCENT_OF_TOTAL_AMOUNT )
    total = (field_t*) Malloc(nlevels*sizeof(field_t));
  if ( IS_SET(request->var1.f5) )
    var15 = (field_t*) Malloc(nlevels*sizeof(field_t));
  if ( IS_SET(request->var2.h2) )
    var22 = (field_t*) Malloc(nlevels*sizeof(field_t));
      
  for ( levelID = 0; levelID < nlevels; levelID++ )
    {
      field_init(&var14[levelID]);
      var14[levelID].grid    = gridID;
      var14[levelID].nmiss   = 0;
      var14[levelID].missval = missval1;
      var14[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));
      
      field_init(&samp1[levelID]);
      samp1[levelID].grid    = gridID;
      samp1[levelID].nmiss   = 0;
      samp1[levelID].missval = missval1;
      samp1[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));

      field_init(&samp2[levelID]);
      samp2[levelID].grid    = gridID;
      samp2[levelID].nmiss   = 0;
      samp2[levelID].missval = missval1;
      samp2[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));

      field_init(&samp3[levelID]);
      samp3[levelID].grid    = gridID;
      samp3[levelID].nmiss   = 0;
      samp3[levelID].missval = missval1;
      samp3[levelID].ptr     = NULL;
      
      if ( request->var1.epilog == PERCENT_OF_TOTAL_AMOUNT )
        {
	  field_init(&total[levelID]);
          total[levelID].grid    = gridID;
          total[levelID].nmiss   = 0;
          total[levelID].missval = missval1;
          total[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));
        }
      if ( IS_SET(request->var1.f5) )
        {
	  field_init(&var15[levelID]);
          var15[levelID].grid    = gridID;
          var15[levelID].nmiss   = 0;
          var15[levelID].missval = missval1;
          var15[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));
        }
      if ( IS_SET(request->var2.h2) )
        {
	  field_init(&var22[levelID]);
          var22[levelID].grid    = gridID;
          var22[levelID].nmiss   = 0;
          var22[levelID].missval = missval1;
          var22[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));
        }
    }

  itsID   = 0;
  otsID   = 0;
  while ( TRUE )
    {
      nsets = 0;
      while ( (nrecs = streamInqTimestep(istreamID1, itsID)) > 0 )
        {
	  if ( !streamInqTimestep(istreamID2, itsID) )
	    cdoAbort("Input streams have different number of time steps!");

          ivdate = taxisInqVdate(itaxisID1);
          ivtime = taxisInqVtime(itaxisID1);
          
	  if ( nsets == 0 ) SET_DATE(indate2, ivdate, ivtime);
	  SET_DATE(indate1, ivdate, ivtime);

	  if ( DATE_IS_NEQ(indate1, indate2, cmplen) ) break;

          for ( recID = 0; recID < nrecs; recID++ )
            {
              streamInqRecord(istreamID1, &varID, &levelID);
              streamInqRecord(istreamID2, &varID, &levelID);

              if ( itsID == 0 )
                {
                  recVarID[recID]   = varID;
                  recLevelID[recID] = levelID;
                }
              if ( varID != FIRST_VAR_ID ) continue;

              if ( nsets == 0 )
                {
                  for ( i = 0; i < gridsize; i++ )
                    {
                      var14[levelID].ptr[i] = missval1;
                      samp1[levelID].ptr[i] = missval1;
                      samp2[levelID].ptr[i] = missval1;
                      if ( IS_SET(samp3[levelID].ptr) )
                        samp3[levelID].ptr[i] = 0.0;
                      if ( request->var1.epilog == PERCENT_OF_TOTAL_AMOUNT )
                        total[levelID].ptr[i] = 0.0;
                      if ( IS_SET(request->var1.f5) ) 
                        var15[levelID].ptr[i] = missval1;
                      if ( IS_SET(request->var2.h2) ) 
                        var22[levelID].ptr[i] = missval1;
                    }
                  var14[levelID].nmiss = gridsize;
                  samp1[levelID].nmiss = gridsize;
                  samp2[levelID].nmiss = gridsize;
                  if ( request->var1.epilog == PERCENT_OF_TOTAL_AMOUNT )
                    total[levelID].nmiss = gridsize;
                  if ( IS_SET(request->var1.f5) )
                    var15[levelID].nmiss = gridsize;
                  if ( IS_SET(request->var2.h2) )
                    var22[levelID].nmiss = gridsize;
                }

              streamReadRecord(istreamID1, field1.ptr, &field1.nmiss);
              field1.grid    = gridID;
              field1.missval = missval1;
              
              streamReadRecord(istreamID2, field2.ptr, &field2.nmiss);
              field2.grid    = gridID;
              field2.missval = missval2;

              farnum(&samp1[levelID], field1);
              farnum(&samp2[levelID], field2);

              if ( request->var1.epilog == PERCENT_OF_TOTAL_AMOUNT )
                farsum(&total[levelID], field1);
                             
              if ( IS_SET(request->var1.f1) ) 
                request->var1.f1(&field1, request->var1.f1arg);
              
              if ( IS_SET(request->var1.f2) )
                request->var1.f2(&field2, request->var1.f2arg);

              if ( field1.nmiss > 0 || IS_SET(samp3[levelID].ptr) )
                {
                  if ( IS_NOT_SET(samp3[levelID].ptr) )
                    {
                      samp3[levelID].ptr = (double*) Malloc(gridsize*sizeof(double));
                      for ( i = 0; i < gridsize; i++ )
                        samp3[levelID].ptr[i] = nsets;
                    }
                  for ( i = 0; i < gridsize; i++ )
                    {
                      if ( DBL_IS_EQUAL(field1.ptr[i], field1.missval) )
                        continue;
                      samp3[levelID].ptr[i]++;
                    }
                }
              
              request->var1.f3(&field1, field2);
              request->var1.f4(&var14[levelID], field1);

              if ( IS_SET(request->var2.h2) )
                {
                  memcpy(field2.ptr, var14[levelID].ptr, gridsize*sizeof(double));
                  field2.nmiss   = var14[levelID].nmiss;
                  field2.grid    = var14[levelID].grid;
                  field2.missval = var14[levelID].missval;

                  if ( IS_SET(request->var2.h1) )
                    request->var2.h1(&field2, request->var2.h1arg);
                    
                  request->var2.h2(&var22[levelID], field2);
                }

              if ( IS_SET(request->var1.f5) )
                request->var1.f5(&var15[levelID], var14[levelID], request->var1.f5arg);              
            }

          ovdate = ivdate;
          ovtime = ivtime;
          nsets++;
          itsID++;
        }

      if ( nrecs == 0 && nsets == 0 ) break;
      
      if ( request->var1.epilog == MEAN || request->var1.epilog == PERCENT_OF_TIME )
        for ( levelID = 0; levelID < nlevels; levelID++ )
          {
	    if ( IS_SET(request->var1.f5) )
	      var = &var15[levelID];
	    else
	      var = &var14[levelID];
	  
            if ( IS_NOT_SET(samp3[levelID].ptr) )
              farcdiv(var, nsets);
            else
              fardiv(var, samp3[levelID]);

	    if ( request->var1.epilog == PERCENT_OF_TIME )
	      farcmul(var, 100.0);
          }
      else if ( request->var1.epilog == PERCENT_OF_TOTAL_AMOUNT )
        for ( levelID = 0; levelID < nlevels; levelID++ )
          {
	    if ( IS_SET(request->var1.f5) )
	      var = &var15[levelID];
	    else
	      var = &var14[levelID];
	  
            fardiv(var, total[levelID]);
	    farcmul(var, 100.0);
          }

      taxisDefVdate(otaxisID, ovdate);
      taxisDefVtime(otaxisID, ovtime);
      streamDefTimestep(ostreamID, otsID);

      if ( otsID && vlistInqVarTsteptype(ivlistID1, FIRST_VAR_ID) == TSTEP_CONSTANT ) continue;

      varID = 0;
      for ( levelID = 0; levelID < nlevels; levelID++ )
	{
	  if ( IS_SET(request->var1.f5) )
	    var = &var15[levelID];
	  else 
	    var = &var14[levelID];
              
	  farsel(var, samp1[levelID]);
	  farsel(var, samp2[levelID]);
              
	  streamDefRecord(ostreamID, varID, levelID);
	  streamWriteRecord(ostreamID, var->ptr, var->nmiss);
	}
      if ( IS_SET(request->var2.h2) )
	{
	  varID = 1;
	  for ( levelID = 0; levelID < nlevels; levelID++ )
	    {
	      var = &var22[levelID];
              
	      farsel(var, samp1[levelID]);
	      farsel(var, samp2[levelID]);
                  
	      streamDefRecord(ostreamID, varID, levelID);
	      streamWriteRecord(ostreamID, var->ptr, var->nmiss);
	    }
        }

      if ( nrecs == 0 ) break;
      otsID++;
    }

  for ( levelID = 0; levelID < nlevels; levelID++ )
    {
      Free(var14[levelID].ptr);
      Free(samp1[levelID].ptr);
      Free(samp2[levelID].ptr);
      if ( IS_SET(samp3[levelID].ptr) ) Free(samp3[levelID].ptr);
    }
  Free(var14);
  Free(samp1);
  Free(samp2);
  Free(samp3);
  
  if ( IS_SET(total) ) 
    {
      for ( levelID = 0; levelID < nlevels; levelID++ )
        Free(total[levelID].ptr);
      Free(total);
    }
  if ( IS_SET(var15) ) 
    {
      for ( levelID = 0; levelID < nlevels; levelID++ )
        Free(var15[levelID].ptr);
      Free(var15);
    }
  if ( IS_SET(var22) ) 
    {
      for ( levelID = 0; levelID < nlevels; levelID++ )
        Free(var22[levelID].ptr);
      Free(var22);
    }
  
  if ( IS_SET(field1.ptr) ) Free(field1.ptr);
  if ( IS_SET(field2.ptr) ) Free(field2.ptr);

  if ( IS_SET(recVarID) )   Free(recVarID);
  if ( IS_SET(recLevelID) ) Free(recLevelID);

  streamClose(ostreamID);
  streamClose(istreamID2);
  streamClose(istreamID1);
}


void eca3(const ECA_REQUEST_3 *request)
{
  const int operatorID = cdoOperatorID();

  int cmplen;
  char indate1[DATE_LEN+1], indate2[DATE_LEN+1];
  int gridsize;
  int ivdate1 = 0, ivtime1 = 0;
  int ivdate2 = 0, ivtime2 = 0;
  int ovdate = 0, ovtime = 0;
  int nrecs, nrecords;
  int gridID, zaxisID, varID, levelID, recID;
  int itsID;
  int otsID;
  long nsets;
  int i;
  int istreamID1, istreamID2, ostreamID;
  int ivlistID1, ivlistID2, ovlistID, itaxisID1, itaxisID2, otaxisID;
  int nlevels;
  int *recVarID, *recLevelID;
  double missval;
  field_t *var1 = NULL, *var2 = NULL;
  field_t field1, field2;
  
  cmplen = DATE_LEN - cdoOperatorF2(operatorID);

  istreamID1 = streamOpenRead(cdoStreamName(0));
  istreamID2 = streamOpenRead(cdoStreamName(1));

  ivlistID1 = streamInqVlist(istreamID1);
  ivlistID2 = streamInqVlist(istreamID2);
  ovlistID  = vlistCreate();
  
  vlistCompare(ivlistID1, ivlistID2, CMP_ALL);
  
  gridID  = vlistInqVarGrid(ivlistID1, FIRST_VAR_ID);
  zaxisID = vlistInqVarZaxis(ivlistID1, FIRST_VAR_ID);
  missval = vlistInqVarMissval(ivlistID1, FIRST_VAR_ID);

  varID   = vlistDefVar(ovlistID, gridID, zaxisID, TSTEP_INSTANT);

  vlistDefVarMissval(ovlistID, varID, missval);
  
  if ( IS_SET(request->name) ) 
    vlistDefVarName(ovlistID, varID, request->name);
  if ( IS_SET(request->longname) ) 
    vlistDefVarLongname(ovlistID, varID, request->longname);
  if ( IS_SET(request->units) ) 
    vlistDefVarUnits(ovlistID, varID, request->units);

  if ( cdoOperatorF2(operatorID) == 16 ) vlistDefNtsteps(ovlistID, 1);

  itaxisID1 = vlistInqTaxis(ivlistID1);
  itaxisID2 = vlistInqTaxis(ivlistID2);
  otaxisID = taxisCreate(TAXIS_RELATIVE);
  taxisDefTunit(otaxisID, TUNIT_MINUTE);
  //  taxisDefCalendar(otaxisID, CALENDAR_PROLEPTIC);
  taxisDefCalendar(otaxisID, taxisInqCalendar(itaxisID1));
  taxisDefRdate(otaxisID, 19550101);
  taxisDefRtime(otaxisID, 0);
  vlistDefTaxis(ovlistID, otaxisID);

  ostreamID = streamOpenWrite(cdoStreamName(2), cdoFiletype());

  streamDefVlist(ostreamID, ovlistID);

  nrecords   = vlistNrecs(ivlistID1);
  recVarID   = (int*) Malloc(nrecords*sizeof(int));
  recLevelID = (int*) Malloc(nrecords*sizeof(int));

  gridsize = gridInqSize(gridID);

  field_init(&field1);
  field_init(&field2);
  field1.ptr = (double*) Malloc(gridsize*sizeof(double));
  field2.ptr = (double*) Malloc(gridsize*sizeof(double));

  nlevels = zaxisInqSize(zaxisID);

  var1 = (field_t*) Malloc(nlevels*sizeof(field_t));
  var2 = (field_t*) Malloc(nlevels*sizeof(field_t));
        
  for ( levelID = 0; levelID < nlevels; levelID++ )
    {
      field_init(&var1[levelID]);
      var1[levelID].grid    = gridID;
      var1[levelID].nmiss   = 0;
      var1[levelID].missval = missval;
      var1[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));
            
      field_init(&var2[levelID]);
      var2[levelID].grid    = gridID;
      var2[levelID].nmiss   = 0;
      var2[levelID].missval = missval;
      var2[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));
    }

  itsID   = 0;
  otsID   = 0;
  while ( TRUE )
    {
      nsets = 0;
      while ( (nrecs = streamInqTimestep(istreamID1, itsID)) > 0 )
        {
	  if ( !streamInqTimestep(istreamID2, itsID) )
	    cdoAbort("Input streams have different number of time steps!");
            
          ivdate1 = taxisInqVdate(itaxisID1);
          ivdate2 = taxisInqVdate(itaxisID2);
          if ( ivdate1 != ivdate2 )
            cdoAbort("Input streams have different verification dates at time step %d!", itsID+1);
            
          ivtime1 = taxisInqVtime(itaxisID1);
          ivtime2 = taxisInqVtime(itaxisID2);
          if ( ivtime1 != ivtime2 )
            cdoAbort("Input streams have different verification times at time step %d!", itsID+1);
   
	  if ( nsets == 0 ) SET_DATE(indate2, ivdate1, ivtime1);
	  SET_DATE(indate1, ivdate1, ivtime1);

	  if ( DATE_IS_NEQ(indate1, indate2, cmplen) ) break;

          for ( recID = 0; recID < nrecs; recID++ )
            {
              streamInqRecord(istreamID1, &varID, &levelID);
              streamInqRecord(istreamID2, &varID, &levelID);

              if ( itsID == 0 )
                {
                  recVarID[recID]   = varID;
                  recLevelID[recID] = levelID;
                }
              if ( varID != FIRST_VAR_ID ) continue;

              if ( nsets == 0 )
                {
                  for ( i = 0; i < gridsize; i++ )
                    {
                      var1[levelID].ptr[i] = missval;
                      var2[levelID].ptr[i] = missval;
                    }
                  var1[levelID].nmiss = gridsize;
                  var2[levelID].nmiss = gridsize;
                }

              streamReadRecord(istreamID1, field1.ptr, &field1.nmiss);
              field1.grid    = var1[levelID].grid;
              field1.missval = var1[levelID].missval;

              streamReadRecord(istreamID2, field2.ptr, &field2.nmiss);
              field2.grid    = var1[levelID].grid;
              field2.missval = var1[levelID].missval;

              request->f1(&var1[levelID], field1);
              request->f2(&var2[levelID], field2);
            }

          ovdate = ivdate1;
          ovtime = ivtime1;
          nsets++;
          itsID++;
        }

      if ( nrecs == 0 && nsets == 0 ) break;
      
      for ( levelID = 0; levelID < nlevels; levelID++ )
        request->f3(&var1[levelID], var2[levelID]);

      taxisDefVdate(otaxisID, ovdate);
      taxisDefVtime(otaxisID, ovtime);
      streamDefTimestep(ostreamID, otsID);

      if ( otsID && vlistInqVarTsteptype(ivlistID1, FIRST_VAR_ID) == TSTEP_CONSTANT ) continue;

      varID = 0;
      for ( levelID = 0; levelID < nlevels; levelID++ )
	{
	  streamDefRecord(ostreamID, varID, levelID);
	  streamWriteRecord(ostreamID, var1[levelID].ptr, var1[levelID].nmiss);
	}

      if ( nrecs == 0 ) break;
      otsID++;
    }

  for ( levelID = 0; levelID < nlevels; levelID++ )
    {
      Free(var1[levelID].ptr);
      Free(var2[levelID].ptr);
    }
  Free(var1);
  Free(var2);
    
  if ( IS_SET(field1.ptr) ) Free(field1.ptr);
  if ( IS_SET(field2.ptr) ) Free(field2.ptr);

  if ( IS_SET(recVarID) )   Free(recVarID);
  if ( IS_SET(recLevelID) ) Free(recLevelID);

  streamClose(ostreamID);
  streamClose(istreamID2);
  streamClose(istreamID1);
}


void eca4(const ECA_REQUEST_4 *request)
{
  const int operatorID = cdoOperatorID();

  int cmplen;
  char indate1[DATE_LEN+1], indate2[DATE_LEN+1];
  int gridsize, gridtype;
  double *yvals;
  int ivdate = 0, ivtime = 0;
  int ovdate = 0, ovtime = 0;
  int month, yearcnt = 0;
  int nrecs, nrecords;
  int gridID, zaxisID, varID, ovarID1, ovarID2, levelID, recID;
  int itsID;
  int otsID;
  long nsets;
  int i;
  int istreamID1, istreamID2, ostreamID;
  int ivlistID1, ivlistID2, ovlistID, itaxisID, otaxisID;
  int nlevels;
  int *recVarID, *recLevelID;
  double missval;
  field_t *startCount          , *endCount;
  field_t *startDateWithHist[2], *endDateWithHist[2];
  field_t *gslDuration, *gslFirstDay;
  field_t fieldGt, fieldLt, mask;
  int resetAtJan = FALSE, resetAtJul = FALSE;
  int isFirstYear = TRUE;

  cmplen = DATE_LEN - cdoOperatorF2(operatorID);

  istreamID1 = streamOpenRead(cdoStreamName(0));
  istreamID2 = streamOpenRead(cdoStreamName(1));

  ivlistID1 = streamInqVlist(istreamID1);
  ivlistID2 = streamInqVlist(istreamID2);
  ovlistID = vlistCreate();

  gridID = vlistInqVarGrid(ivlistID1, FIRST_VAR_ID);
  if ( gridID != vlistInqVarGrid(ivlistID2, FIRST_VAR_ID) ) cdoAbort("Grid sizes of the input fields do not match!");

  zaxisID = vlistInqVarZaxis(ivlistID1, FIRST_VAR_ID);
  missval = vlistInqVarMissval(ivlistID1, FIRST_VAR_ID);

  ovarID1 = vlistDefVar(ovlistID, gridID, zaxisID, TSTEP_INSTANT);

  vlistDefVarMissval(ovlistID, ovarID1, missval);

  if ( IS_SET(request->name) )
    vlistDefVarName(ovlistID, ovarID1, request->name);
  if ( IS_SET(request->longname) ) 
    vlistDefVarLongname(ovlistID, ovarID1, request->longname);
  if ( IS_SET(request->units) ) 
    vlistDefVarUnits(ovlistID, ovarID1, request->units);

  ovarID2 = vlistDefVar(ovlistID, gridID, zaxisID, TSTEP_INSTANT);
  
  vlistDefVarMissval(ovlistID, ovarID2, missval);

  if ( IS_SET(request->name2) ) 
    vlistDefVarName(ovlistID, ovarID2, request->name2);
  if ( IS_SET(request->longname2) ) 
    vlistDefVarLongname(ovlistID, ovarID2, request->longname2);
  if ( IS_SET(request->units2) ) 
    vlistDefVarUnits(ovlistID, ovarID2, request->units2);

  if ( cdoOperatorF2(operatorID) == 16 ) vlistDefNtsteps(ovlistID, 1);

  itaxisID = vlistInqTaxis(ivlistID1);
  otaxisID = taxisCreate(TAXIS_RELATIVE);
  taxisDefTunit(otaxisID, TUNIT_MINUTE);
  //  taxisDefCalendar(otaxisID, CALENDAR_PROLEPTIC);
  taxisDefCalendar(otaxisID, taxisInqCalendar(itaxisID));
  taxisDefRdate(otaxisID, 19550101);
  taxisDefRtime(otaxisID, 0);
  vlistDefTaxis(ovlistID, otaxisID);

  ostreamID = streamOpenWrite(cdoStreamName(2), cdoFiletype());

  streamDefVlist(ostreamID, ovlistID);

  nrecords    = vlistNrecs(ivlistID1);
  recVarID    = (int*) Malloc(nrecords*sizeof(int));
  recLevelID  = (int*) Malloc(nrecords*sizeof(int));

  gridtype = gridInqType(gridID);
  if ( gridtype != GRID_UNSTRUCTURED && gridtype != GRID_CURVILINEAR ) 
    {
      if ( gridtype == GRID_GME )
        gridID = gridToUnstructured(gridID, 1);
      else
        gridID = gridToCurvilinear(gridID, 1);
    }
  gridsize    = gridInqSize(gridID);
  /* for later check on northern\southern hemisphere */
  yvals   = (double*) Malloc(gridsize*sizeof(double));
  gridInqYvals(gridID,yvals);

  /* Two fields are needed because of the definition of gsl for northern and
  * southern hemisphere                                                      */
  field_init(&fieldGt);
  field_init(&fieldLt);
  fieldGt.ptr = (double*) Malloc(gridsize*sizeof(double));
  fieldLt.ptr = (double*) Malloc(gridsize*sizeof(double));

  /* field for the land-water-distribution */
  field_init(&mask);
  mask.ptr    = (double*) Malloc(gridsize*sizeof(double));

  nlevels     = zaxisInqSize(zaxisID);

  startCount  = (field_t*) Malloc(nlevels*sizeof(field_t));
  endCount    = (field_t*) Malloc(nlevels*sizeof(field_t));
  gslDuration = (field_t*) Malloc(nlevels*sizeof(field_t));
  gslFirstDay = (field_t*) Malloc(nlevels*sizeof(field_t));

  /* because of the different definitions for northern and southern hemisphere,
   * the values of the last year have to be present
   * THE LAST YEAR HAS THE INDEX 1 */
  for ( int h = 0; h < 2; h++ )
  {
    startDateWithHist[h] = (field_t*) Malloc(nlevels*sizeof(field_t));
    endDateWithHist[h]   = (field_t*) Malloc(nlevels*sizeof(field_t));
  }

  for ( levelID = 0; levelID < nlevels; levelID++ )
  {
    field_init(&startCount[levelID]);
    startCount[levelID].grid     = gridID;
    startCount[levelID].size     = gridsize;
    startCount[levelID].nmiss    = 0;
    startCount[levelID].missval  = missval;
    startCount[levelID].ptr      = (double*) Malloc(gridsize*sizeof(double));
    memset(startCount[levelID].ptr, 0, gridsize*sizeof(double));

    field_init(&endCount[levelID]);
    endCount[levelID].grid       = gridID;
    endCount[levelID].size       = gridsize;
    endCount[levelID].nmiss      = 0;
    endCount[levelID].missval    = missval;
    endCount[levelID].ptr        = (double*) Malloc(gridsize*sizeof(double));
    memset(endCount[levelID].ptr, 0, gridsize*sizeof(double));

    field_init(&gslDuration[levelID]);
    gslDuration[levelID].grid    = gridID;
    gslDuration[levelID].size    = gridsize;
    gslDuration[levelID].nmiss   = 0;
    gslDuration[levelID].missval = missval;
    gslDuration[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));

    field_init(&gslFirstDay[levelID]);
    gslFirstDay[levelID].grid    = gridID;
    gslFirstDay[levelID].size    = gridsize;
    gslFirstDay[levelID].nmiss   = 0;
    gslFirstDay[levelID].missval = missval;
    gslFirstDay[levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));

    for ( int h = 0; h < 2; h++ )
    {
      field_init(&startDateWithHist[h][levelID]);
      startDateWithHist[h][levelID].grid    = gridID;
      startDateWithHist[h][levelID].size    = gridsize;
      startDateWithHist[h][levelID].nmiss   = 0;
      startDateWithHist[h][levelID].missval = missval;
      startDateWithHist[h][levelID].ptr     = (double*) Malloc(gridsize*sizeof(double));

      field_init(&endDateWithHist[h][levelID]);
      endDateWithHist[h][levelID].grid      = gridID;
      endDateWithHist[h][levelID].size      = gridsize;
      endDateWithHist[h][levelID].nmiss     = 0;
      endDateWithHist[h][levelID].missval   = missval;
      endDateWithHist[h][levelID].ptr       = (double*) Malloc(gridsize*sizeof(double));
    }
  }

  itsID   = 0;
  otsID   = 0;

  if ( streamInqTimestep(istreamID2, itsID) )
    {
      streamInqRecord(istreamID2, &varID, &levelID);
      streamReadRecord(istreamID2, mask.ptr, &mask.nmiss);
      mask.grid    = gridID;
      mask.missval = vlistInqVarMissval(ivlistID2, 0);

      request->s3(&mask, request->s3arg);
    }
  else cdoAbort("Could not read land-water mask!");

  while ( TRUE )
    {
      nsets = 0;
      while ( (nrecs = streamInqTimestep(istreamID1, itsID)) > 0 )
        {
          ivdate = taxisInqVdate(itaxisID);
          ivtime = taxisInqVtime(itaxisID);

          month = (ivdate % 10000) / 100;
          if ( month < 1 || month > 12 ) cdoAbort("month %d out of range!", month);

          if ( nsets == 0 ) SET_DATE(indate2, ivdate, ivtime);
          SET_DATE(indate1, ivdate, ivtime);

          if ( DATE_IS_NEQ(indate1, indate2, cmplen) ) {
            resetAtJan = FALSE;
            resetAtJul = FALSE;
            break;
          }

          for ( recID = 0; recID < nrecs; recID++ )
            {
              streamInqRecord(istreamID1, &varID, &levelID);

              if ( itsID == 0 )
                {
                  recVarID[recID]   = varID;
                  recLevelID[recID] = levelID;
                }
              if ( varID != FIRST_VAR_ID ) continue;

              if ( nsets == 0 )
                {
                  for ( i = 0; i < gridsize; i++ )
                    {
                      gslDuration[levelID].ptr[i]          = missval;
                      gslFirstDay[levelID].ptr[i]          = missval;
                      /* reinitialize the current year */
                      startDateWithHist[0][levelID].ptr[i] = missval;
                      endDateWithHist[0][levelID].ptr[i]   = missval;
                    }
                  gslDuration[levelID].nmiss          = 0;
                  gslFirstDay[levelID].nmiss          = 0;
                  /* reinitialize the current year */
                  startDateWithHist[0][levelID].nmiss = gridsize;
                  endDateWithHist[0][levelID].nmiss   = gridsize;
                }
              /* init the history ONCE */
              if ( 0 == itsID )
                {
                  for ( i = 0; i < gridsize; i++ )
                    {
                      startDateWithHist[1][levelID].ptr[i] = missval;
                      endDateWithHist[1][levelID].ptr[i]   = missval;
                    }
                  startDateWithHist[1][levelID].nmiss = gridsize;
                  endDateWithHist[1][levelID].nmiss   = gridsize;
                }

              streamReadRecord(istreamID1, fieldGt.ptr, &fieldGt.nmiss);
              memcpy(fieldLt.ptr, fieldGt.ptr, gridsize*sizeof(double));
              fieldLt.nmiss = fieldGt.nmiss;
              fieldGt.grid    = startCount[levelID].grid;
              fieldGt.missval = startCount[levelID].missval;
              fieldLt.grid    = startCount[levelID].grid;
              fieldLt.missval = startCount[levelID].missval;

              /* Reinitialization of (start|end)Count variables has to be done
               * different for norther and southern hemisphere */
              if ( 1 == month && !resetAtJan )
              {
                /* reset northern startCount */
                for ( i = 0; i < gridsize; i++ )
                  {
                    if ( yvals[i] >= 0.0 )
                      if ( !DBL_IS_EQUAL(startCount[levelID].ptr[i], missval) )
                      {
                        startCount[levelID].ptr[i] = missval;
                        startCount[levelID].nmiss++;
                      }
                  }
                /* reset southern endCount */
                for ( i = 0; i < gridsize; i++ )
                  {
                    if ( yvals[i] < 0.0 )
                      if ( !DBL_IS_EQUAL(endCount[levelID].ptr[i], missval) )
                        {
                          endCount[levelID].ptr[i] = missval;
                          endCount[levelID].nmiss++;
                        }
                  }

                resetAtJan = TRUE;
              }
              if ( 7 == month && !resetAtJul )
              {
#if defined(_OPENMP)
#pragma omp sections
#endif
                {
#if defined(_OPENMP)
#pragma omp section
#endif
                  {
                    /* reset northern endCount  */
                    for ( i = 0; i < gridsize; i++ )
                      {
                        if ( yvals[i] >= 0.0 )
                          {
                            if ( !DBL_IS_EQUAL(endCount[levelID].ptr[i], missval) )
                              {
                                endCount[levelID].ptr[i] = missval;
                                endCount[levelID].nmiss++;
                              }
                          }
                      }
                  }
#if defined(_OPENMP)
#pragma omp section
#endif
                  {
                    /* reset southern startCount */
                    for ( i = 0; i < gridsize; i++ )
                    {
                      if ( yvals[i] < 0.0 )
                      {
                        if ( !DBL_IS_EQUAL(startCount[levelID].ptr[i], missval) )
                          {
                            startCount[levelID].ptr[i] = missval;
                            startCount[levelID].nmiss++;
                          }
                      }
                    }
                  }
                }
                resetAtJul = TRUE;
              }

              /* count the day with temperature larger/smaller than the given limit */
#if defined(_OPENMP)
#pragma omp sections
#endif
              {
#if defined(_OPENMP)
#pragma omp section
#endif
                {
                  farsel(&fieldGt             , mask);
                  request->s1(&fieldGt        , request->s1arg);
                  farnum2(&startCount[levelID], fieldGt);
                }
#if defined(_OPENMP)
#pragma omp section
#endif
                {
                  farsel(&fieldLt           , mask);
                  request->s2(&fieldLt      , request->s1arg);
                  farnum2(&endCount[levelID], fieldLt);
                }
              }

              if ( month < 7 )
                {
                  for ( i = 0; i < gridsize; i++ )
                    /* dictinct between northern and southern sphere */
                    /* start with south */
                    if ( yvals[i] < 0 )
                    {
                      /* south: periods can also start in the first half of the
                       * year, but this date has already gone into the history */
                      if ( DBL_IS_EQUAL(startDateWithHist[1][levelID].ptr[i], missval) &&
                           IS_EQUAL(startCount[levelID].ptr[i], request->consecutiveDays) )
                      {
                        startDateWithHist[1][levelID].ptr[i] = ivdate;
                        /* reset the endCount, because we are only interessted
                         * in the end of the eriod, if a start was found */
                        endCount[levelID].ptr[i]           = missval;
                        endDateWithHist[0][levelID].ptr[i] = missval;
                      }
                      if ( DBL_IS_EQUAL(endDateWithHist[0][levelID].ptr[i], missval) &&
                          IS_EQUAL(endCount[levelID].ptr[i], request->consecutiveDays) )
                      {
                        endDateWithHist[0][levelID].ptr[i] = ivdate;
                      }
                    }
                    else
                    {
                      if ( DBL_IS_EQUAL(startDateWithHist[0][levelID].ptr[i], missval) && 
                           IS_EQUAL(startCount[levelID].ptr[i], request->consecutiveDays) )
                      {
                        startDateWithHist[0][levelID].ptr[i] = ivdate;
                      }
                    }
                }
              else
                {
                  for ( i = 0; i < gridsize; i++ )
                  {
                    if ( yvals[i] < 0 )
                    {
                      if ( DBL_IS_EQUAL(startDateWithHist[0][levelID].ptr[i], missval) &&
                           IS_EQUAL(startCount[levelID].ptr[i], request->consecutiveDays) )
                      {
                        startDateWithHist[0][levelID].ptr[i] = ivdate;
                      }
                    }
                    else
                    {
                      /* north: periods can also start in the second half of the year */
                      if ( DBL_IS_EQUAL(startDateWithHist[0][levelID].ptr[i], missval) &&
                           IS_EQUAL(startCount[levelID].ptr[i], request->consecutiveDays) )
                      {
                        startDateWithHist[0][levelID].ptr[i] = ivdate;
                        /* reset the endCount, because we are only interessted
                         * in the end of the eriod, if a start was found */
                        endCount[levelID].ptr[i]           = missval;
                        endDateWithHist[0][levelID].ptr[i] = missval;
                      }
                      if ( DBL_IS_EQUAL(endDateWithHist[0][levelID].ptr[i], missval) && 
                          IS_EQUAL(endCount[levelID].ptr[i], request->consecutiveDays) )
                      {
                        endDateWithHist[0][levelID].ptr[i] = ivdate;
                      }
                    }
                  }
                }
              /* update nmiss for saving data in GRIB */
              fldunm(&startCount[levelID]);
              fldunm(  &endCount[levelID]);
              fldunm(&startDateWithHist[1][levelID]);
              fldunm(&startDateWithHist[0][levelID]);
              fldunm(  &endDateWithHist[1][levelID]);
              fldunm(  &endDateWithHist[0][levelID]);

            }

          ovdate = ivdate;
          ovtime = ivtime;
          nsets++;
          itsID++;
        }

      if ( nrecs == 0 && nsets == 0 ) break;

      adjustEndDate(nlevels, gridsize, yvals, missval, ovdate,
                    startDateWithHist, endDateWithHist);

      /*  compute and write GSL for the previous year
       *  AND
       *  write the current start/end dates into the history
       *
       *  this is the default action if more than a year is available */
      if (yearcnt != 0)
        {
          computeGsl(nlevels, gridsize, yvals, missval,
                     startDateWithHist, endDateWithHist,
                     gslDuration, gslFirstDay,
                     FALSE);

          /* values of the privous year */
          {writeGslStream(ostreamID, otaxisID, otsID,
                          ovarID1, ovarID2,ivlistID1,
                          FIRST_VAR_ID,
                          gslDuration, gslFirstDay,
                          cdiEncodeDate(ovdate/10000 - 1, 12, 31), ovtime,  nlevels); otsID++;}
        }

      /*  if there is a previous year */
      if (ovdate != ivdate)
      {
        /*  if the first year of data was processed, the history has to
         *  be checked befor it get's updated. This is necessary, if a
         *  growing period on the southern hemisphere was found. Otherwise,
         *  it would get overwritten. */
        if ( isFirstYear )
          {
            /*  Check for non missing values, i.e. is there any data for the
             *  previous year? */
            if ( fldhvs(startDateWithHist[1], nlevels) )
              {
                computeGsl(nlevels, gridsize, yvals, missval,
                          startDateWithHist, endDateWithHist,
                          gslDuration, gslFirstDay,
                          FALSE);
                {writeGslStream(ostreamID, otaxisID, otsID,
                                ovarID1, ovarID2,ivlistID1,
                                FIRST_VAR_ID,
                                gslDuration, gslFirstDay,
                                cdiEncodeDate(ovdate/10000 - 1,12,31), ovtime, nlevels); otsID++;}
              }
            isFirstYear = FALSE;
          }
#if defined(_OPENMP)
#pragma omp sections
#endif
          {
            updateHist(startDateWithHist, nlevels, gridsize, yvals, FALSE);
#if defined(_OPENMP)
#pragma omp section
#endif
            updateHist(endDateWithHist,   nlevels, gridsize, yvals, TRUE);
          }
        }
      else /* process the current year, this only happens, if the last timestep
              is reached OR if data for only one year is present */
        {
          computeGsl(nlevels, gridsize, yvals, missval,
                     startDateWithHist, endDateWithHist,
                     gslDuration, gslFirstDay,
                     TRUE);
          {writeGslStream(ostreamID, otaxisID, otsID,
                          ovarID1, ovarID2,ivlistID1,
                          FIRST_VAR_ID,
                          gslDuration, gslFirstDay,
                          ovdate, ovtime, nlevels); otsID++;}
        }
      yearcnt++;

      if ( nrecs == 0 ) break;
    }

  for ( levelID = 0; levelID < nlevels; levelID++ )
    {
      Free(startCount[levelID].ptr);
      Free(endCount[levelID].ptr);
      Free(gslDuration[levelID].ptr);
      Free(gslFirstDay[levelID].ptr);
      for (int h = 0; h < 2; h++)
        {
          Free(startDateWithHist[h][levelID].ptr);
          Free(endDateWithHist[h][levelID].ptr);
        }
    }
  for (int h = 0; h < 2; h++)
    {
      Free(startDateWithHist[h]);
      Free(endDateWithHist[h]);
    }
  Free(startCount);
  Free(endCount);
  Free(gslDuration);
  Free(gslFirstDay);

  if ( IS_SET(fieldGt.ptr) ) Free(fieldGt.ptr);
  if ( IS_SET(fieldLt.ptr) ) Free(fieldLt.ptr);

  if ( IS_SET(recVarID) )   Free(recVarID);
  if ( IS_SET(recLevelID) ) Free(recLevelID);

  streamClose(ostreamID);
  streamClose(istreamID1);

}
