/****************************************
*  Computer Algebra System SINGULAR     *
****************************************/
/***************************************************************
 *  File:    pDebug.h
 *  Purpose: implementation of debug related poly routines
 *  Author:  obachman (Olaf Bachmann)
 *  Created: 8/00
 *  Version: $Id: pDebug.cc,v 1.9 2008-01-31 13:22:02 Singular Exp $
 *******************************************************************/

#ifndef PDEBUG_CC
#define PDEBUG_CC
#include <stdarg.h>
#include <stdio.h>


#include "mod2.h"
#ifdef PDEBUG

// do the following to always enforce checking of pSetm
// #undef PDEBUG
// #define PDEBUG 2

#include "p_polys.h"
#include "febase.h"
#include "omalloc.h"
#include "ring.h"
#include "numbers.h"

/***************************************************************
 *
 * Error reporting
 *
 ***************************************************************/
// avoid recursive calls
static BOOLEAN d_poly_error_reporting = FALSE;
BOOLEAN dPolyReportError(poly p, ring r, const char* fmt, ...)
{
  if (d_poly_error_reporting) return FALSE;
  d_poly_error_reporting = TRUE;
  va_list ap;
  va_start(ap, fmt);

  fprintf(stderr, "\n// ***dPolyError: ");
  vfprintf(stderr, fmt, ap);
  fprintf(stderr, "\n occured at\n");
  omPrintCurrentBackTraceMax(stderr, 8);
  if (p != NULL)
  {
    if (r == currRing)
    {
      fprintf(stderr, " occured for poly: ");
      p_wrp(p, r);
      omPrintAddrInfo(stderr, p, " ");
    }
    else
    {
      omPrintAddrInfo(stderr, p, " occured for poly: ");
    }
  }
  dErrorBreak();
  d_poly_error_reporting = FALSE;
  return FALSE;
}

/***************************************************************
 *
 * checking for ring stuff
 *
 ***************************************************************/
BOOLEAN p_LmCheckIsFromRing(poly p, ring r)
{
  if (p != NULL)
  {
    void* custom = omGetCustomOfAddr(p);
    if (custom != NULL)
    {
      pPolyAssumeReturnMsg(custom == r ||
                           // be more sloppy for qrings
                           (r->qideal != NULL &&
                            omIsBinPageAddr(p) &&
                            omSizeWOfAddr(p)==r->PolyBin->sizeW) ||
                           rSamePolyRep((ring) custom, r),
                           "monomial not from specified ring");
      return TRUE;
    }
    else
    {
      pPolyAssumeReturn(omIsBinPageAddr(p) && omSizeWOfAddr(p)==r->PolyBin->sizeW);
      return TRUE;
    }
    return FALSE;
  }
  return TRUE;
}

BOOLEAN p_CheckIsFromRing(poly p, ring r)
{
  while (p!=NULL)
  {
    pFalseReturn(p_LmCheckIsFromRing(p, r));
    pIter(p);
  }
  return TRUE;
}

BOOLEAN p_CheckPolyRing(poly p, ring r)
{
  pAssumeReturn(r != NULL && r->PolyBin != NULL);
  return p_CheckIsFromRing(p, r);
}

BOOLEAN p_LmCheckPolyRing(poly p, ring r)
{
  pAssumeReturn(r != NULL && r->PolyBin != NULL);
  pAssumeReturn(p != NULL);
  return p_LmCheckIsFromRing(p, r);
}
BOOLEAN p_CheckRing(ring r)
{
  pAssumeReturn(r != NULL && r->PolyBin != NULL);
  return TRUE;
}

/***************************************************************
 *
 * Debugging/statistics of pDivisibleBy
 *
 ***************************************************************/
BOOLEAN p_DebugLmDivisibleByNoComp(poly a, poly b, ring r)
{
  int i=r->N;

  do
  {
    if (p_GetExp(a,i,r) > p_GetExp(b,i,r))
      return FALSE;
    i--;
  }
  while (i);
#ifdef HAVE_RINGS
  return nDivBy(pGetCoeff(b), pGetCoeff(a));
#else
  return TRUE;
#endif
     }


/***************************************************************
 *
 * Misc things helpful for debugging
 *
 ***************************************************************/
BOOLEAN pIsMonomOf(poly p, poly m)
{
  if (m == NULL) return TRUE;
  while (p != NULL)
  {
    if (p == m) return TRUE;
    pIter(p);
  }
  return FALSE;
}
BOOLEAN pHaveCommonMonoms(poly p, poly q)
{
  while (p != NULL)
  {
    if (pIsMonomOf(q, p))
    {
      return TRUE;
    }
    pIter(p);
  }
  return FALSE;
}

/***************************************************************
 *
 * Testing of polys
 *
 ***************************************************************/
extern void p_Setm_General(poly p, ring r);

static poly p_DebugInit(poly p, ring src_ring, ring dest_ring)
{
  poly d_p = p_Init(dest_ring);
  int i;
  assume(dest_ring->N == src_ring->N);

  for (i=1; i<= src_ring->N; i++)
  {
    p_SetExp(d_p, i, p_GetExp(p, i, src_ring), dest_ring);
  }
  if (rRing_has_Comp(dest_ring))
    p_SetComp(d_p, p_GetComp(p, src_ring), dest_ring);

  p_Setm_General(d_p, dest_ring);
  return d_p;
}

BOOLEAN _p_Test(poly p, ring r, int level)
{
  assume(r->cf !=NULL);

  if (PDEBUG > level) level = PDEBUG;
  if (level < 0 || p == NULL) return TRUE;

  poly p_prev = NULL;

  #ifndef OM_NDEBUG
  // check addr with level+1 so as to check bin/page of addr
  pPolyAssumeReturnMsg(omTestBinAddrSize(p, (r->PolyBin->sizeW)*SIZEOF_LONG, level+1)
                        == omError_NoError, "memory error");
  #endif

  pFalseReturn(p_CheckRing(r));

  // this checks that p does not contain a loop: rather expensive O(length^2)
  #ifndef OM_NDEBUG
  if (level > 1)
    pFalseReturn(omTestList(p, level) == omError_NoError);
  #endif

  int ismod = p_GetComp(p, r) > 0;

  while (p != NULL)
  {
    // ring check
    pFalseReturn(p_LmCheckIsFromRing(p, r));
    #ifndef OM_NDEBUG
    // omAddr check
    pPolyAssumeReturnMsg(omTestBinAddrSize(p, (r->PolyBin->sizeW)*SIZEOF_LONG, 1)
                     == omError_NoError, "memory error");
    #endif
    // number/coef check
    pPolyAssumeReturnMsg(p->coef != NULL || (n_GetChar(r) >= 2), "NULL coef");
    #ifdef LDEBUG
    r->cf->nDBTest(p->coef,__FILE__,__LINE__);
    #endif
    pPolyAssumeReturnMsg(!n_IsZero(p->coef, r), "Zero coef");

    // check for valid comp
    pPolyAssumeReturnMsg(p_GetComp(p, r) >= 0 && (p_GetComp(p, r)<65000), "component out of range ?");
    // check for mix poly/vec representation
    pPolyAssumeReturnMsg(ismod == (p_GetComp(p, r) > 0), "mixed poly/vector");

    // special check for ringorder_s/S
    if ((r->order!=NULL) &&(r->order[1] == ringorder_S))
    {
      long c1, cc1, ccc1, ec1;
      sro_ord* o = &(r->typ[1]);

      c1 = p_GetComp(p, r);
      cc1 = o->data.syzcomp.Components[c1];
      ccc1 = o->data.syzcomp.ShiftedComponents[cc1];
      pPolyAssumeReturnMsg(c1 == 0 || cc1 != 0, "Component <-> TrueComponent zero mismatch");
      pPolyAssumeReturnMsg(c1 == 0 || ccc1 != 0,"Component <-> ShiftedComponent zero mismatch");
      ec1 = p->exp[r->typ[1].data.syzcomp.place];
      pPolyAssumeReturnMsg(ec1 == ccc1, "Shifted comp out of sync. should %d, is %d");
    }

    // check that p_Setm works ok
    if (level > 0)
    {
      poly p_should_equal = p_DebugInit(p, r, r);
      pPolyAssumeReturnMsg(p_ExpVectorEqual(p, p_should_equal, r), "p_Setm field(s) out of sync");
      p_LmFree(p_should_equal, r);
    }

    // check order
    if (p_prev != NULL)
    {
      int cmp = p_LmCmp(p_prev, p, r);
      if (cmp == 0)
      {
        _pPolyAssumeReturnMsg(0, "monoms p and p->next are equal", p_prev, r);
      }
      else
        _pPolyAssumeReturnMsg(p_LmCmp(p_prev, p, r) == 1, "wrong order", p_prev, r);

      // check that compare worked sensibly
      if (level > 1 && p_GetComp(p_prev, r) == p_GetComp(p, r))
      {
        int i;
        for (i=r->N; i>0; i--)
        {
          if (p_GetExp(p_prev, i, r) != p_GetExp(p, i, r)) break;
        }
        _pPolyAssumeReturnMsg(i > 0, "Exponents equal but compare different", p_prev, r);
      }
    }
    p_prev = p;
    pIter(p);
  }
  return TRUE;
}

BOOLEAN _p_LmTest(poly p, ring r, int level)
{
  if (level < 0 || p == NULL) return TRUE;
  poly pnext = pNext(p);
  pNext(p) = NULL;
  BOOLEAN test_res = _p_Test(p, r, level);
  pNext(p) = pnext;
  return test_res;
}

BOOLEAN _pp_Test(poly p, ring lmRing, ring tailRing, int level)
{
  if (PDEBUG > level) level = PDEBUG;
  if (level < 0 || p == NULL) return TRUE;
  if (pNext(p) == NULL || lmRing == tailRing) return _p_Test(p, lmRing, level);

  pFalseReturn(_p_LmTest(p, lmRing, level));
  pFalseReturn(_p_Test(pNext(p), tailRing, level));

  // check that lm > Lm(tail)
  if (level > 1)
  {
    poly lm = p;
    poly tail = p_DebugInit(pNext(p), tailRing, lmRing);
    poly pnext = pNext(lm);
    pNext(lm) = tail;
    BOOLEAN cmp = p_LmCmp(lm, tail, lmRing);
    if (cmp != 1)
      dPolyReportError(lm, lmRing, "wrong order: lm <= Lm(tail)");
    p_LmFree(tail, lmRing);
    pNext(lm) = pnext;
    return (cmp == 1);
  }
  return TRUE;
}

#endif // PDEBUG

#include "pInline1.h"

#if defined(PDEBUG) || defined(PDIV_DEBUG)
static unsigned long pDivisibleBy_number = 1;
static unsigned long pDivisibleBy_FALSE = 1;
static unsigned long pDivisibleBy_ShortFalse = 1;
BOOLEAN pDebugLmShortDivisibleBy(poly p1, unsigned long sev_1, ring r_1,
                               poly p2, unsigned long not_sev_2, ring r_2)
{
  _pPolyAssume(p_GetShortExpVector(p1, r_1) == sev_1, p1, r_1);
  _pPolyAssume(p_GetShortExpVector(p2, r_2) == ~ not_sev_2, p2, r_2);

  pDivisibleBy_number++;
  BOOLEAN ret;
  if (r_1 == r_2)
    ret = p_LmDivisibleBy(p1, p2, r_1);
  else
    ret = p_LmDivisibleBy(p1, r_1, p2, r_2);

  if (! ret) pDivisibleBy_FALSE++;
  if (sev_1 & not_sev_2)
  {
    pDivisibleBy_ShortFalse++;
    if (ret)
      dReportError("p1 divides p2, but sev's are wrong");
  }
  return ret;
}

void pPrintDivisbleByStat()
{
  Print("#Tests: %d; #FALSE %d(%d); #SHORT %d(%d)\n",
        pDivisibleBy_number,
        pDivisibleBy_FALSE, (unsigned long) ((double)pDivisibleBy_FALSE*((double) 100)/(double)pDivisibleBy_number),
        pDivisibleBy_ShortFalse, (unsigned long) ((double)pDivisibleBy_ShortFalse*((double)100)/(double)pDivisibleBy_FALSE));
}

#endif // PDEBUG

#endif // PDEBUG_CC