/*--------------------------------------------------------------------------

			S I M C O U N T E R
			
	As the Schluempfe fail to provide proper complete instruments for
	testing, we need a simulated counter. This is implemented here.
	

	Mark Koennecke,    January 1997

	Copyright:

	Labor fuer Neutronenstreuung
	Paul Scherrer Institut
	CH-5423 Villigen-PSI


        The authors hereby grant permission to use, copy, modify, distribute,
        and license this software and its documentation for any purpose, provided
        that existing copyright notices are retained in all copies and that this
        notice is included verbatim in any distributions. No written agreement,
        license, or royalty fee is required for any of the authorized uses.
        Modifications to this software may be copyrighted by their authors
        and need not follow the licensing terms described here, provided that
        the new terms are clearly indicated on the first page of each file where
        they apply.

        IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY
        FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
        ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY
        DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE
        POSSIBILITY OF SUCH DAMAGE.

        THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
        INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
        FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.  THIS SOFTWARE
        IS PROVIDED ON AN "AS IS" BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE
        NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
        MODIFICATIONS.
----------------------------------------------------------------------------*/
#include <stdlib.h>
#include <assert.h>
#include <math.h>
#include <time.h>
#include "fortify.h"
#include <string.h>
#include "sics.h"
#include "countdriv.h"
/*---------------------------------------------------------------------------
    A SIMCOUNTER HAS a BUILT IN FAILURE RATE OF 10% FOR TESTING ERROR HANDLING
    CODE. A negative failure rate means absolute success.
*/
static float FAILRATE;
/*----------------------------------------------------------------------------*/
static float SimRandom(void)
{
  float fVal;

  fVal = ((float) rand() / (float) RAND_MAX) * 100.0;
  return fVal;
}

/*---------------------------------------------------------------------------*/
typedef struct {
  long lEnd;
  int iPause;
  long tStart;
} SimSt;
/*---------------------------------------------------------------------------*/
static int SIMGetStatus(struct __COUNTER *self, float *fControl)
{
  SimSt *pSim = NULL;
  time_t tD, tDe;
  int iRun;

  assert(self);
  pSim = (SimSt *) self->pData;
  assert(pSim);

  /*
     no fail, no wait case
   */
  if (FAILRATE < .0) {
    return HWIdle;
  }

  if (pSim->iPause == 1) {
    return HWPause;
  }

  if (SimRandom() < FAILRATE) {
    return HWFault;
  }

  /* calculate time */
  self->fTime = (long) time(NULL) - pSim->tStart;

  iRun = 1;
  if (self->eMode == eTimer) {
    if ((long) time(&tD) > pSim->lEnd) {
      iRun = 0;
    }
    tDe = pSim->lEnd - tD;
    *fControl = (float) tDe;

  } else {
    pSim->lEnd += SimRandom();
    if (pSim->lEnd > (long) self->fPreset) {
      iRun = 0;
    }
    *fControl = (float) pSim->lEnd;
  }
  if (iRun) {
    return HWBusy;
  } else {
    return HWIdle;
  }
}

/*---------------------------------------------------------------------------*/
static int SIMStart(struct __COUNTER *self)
{
  SimSt *pSim = NULL;
  time_t tD;
  int iRun;

  assert(self);
  pSim = (SimSt *) self->pData;
  assert(pSim);

  pSim->iPause = 0;
  pSim->tStart = time(NULL);
  if (self->eMode == eTimer) {
    pSim->lEnd = (long) time(&tD) + (long) self->fPreset;
  } else {
    pSim->lEnd = 0;
  }

  if (FAILRATE < .0) {
    return OKOK;
  }

  if (SimRandom() < FAILRATE) {
    return HWFault;
  }

  return OKOK;
}

/*---------------------------------------------------------------------------*/
static int SIMPause(struct __COUNTER *self)
{
  SimSt *pSim = NULL;
  time_t tD;
  int iRun;

  assert(self);
  pSim = (SimSt *) self->pData;
  assert(pSim);

  pSim->iPause = 1;

  /*
     no fail, no wait case
   */
  if (FAILRATE < .0) {
    return OKOK;
  }

  if (SimRandom() < FAILRATE) {
    return HWFault;
  }

  return OKOK;
}

/*---------------------------------------------------------------------------*/
static int SIMContinue(struct __COUNTER *self)
{
  SimSt *pSim = NULL;
  time_t tD;
  int iRun;

  assert(self);
  pSim = (SimSt *) self->pData;
  assert(pSim);

  pSim->iPause = 0;

  if (FAILRATE < .0) {
    return OKOK;
  }

  if (SimRandom() < FAILRATE) {
    return HWFault;
  }

  return OKOK;
}

/*--------------------------------------------------------------------------*/
static int SIMHalt(struct __COUNTER *self)
{
  SimSt *pSim = NULL;
  int iRun;

  assert(self);
  pSim = (SimSt *) self->pData;
  assert(pSim);

  if (FAILRATE < .0) {
    return OKOK;
  }

  if (SimRandom() < FAILRATE) {
    return HWFault;
  }
  if (self->eMode == eTimer) {
    pSim->lEnd = 0;
  } else {
    pSim->lEnd = (long) self->fPreset + 10;
  }
  return OKOK;
}

/*-------------------------------------------------------------------------*/
static int SIMReadValues(struct __COUNTER *self)
{
  SimSt *pSim = NULL;
  int i;

  assert(self);
  pSim = (SimSt *) self->pData;
  assert(pSim);

  /*
     no fail, no wait case
   */
  if (FAILRATE < .0) {
    for (i = 0; i < MAXCOUNT; i++) {
      self->lCounts[i] = (long) (SimRandom() * 100);
    }
    self->lCounts[1] = self->fPreset;
    return OKOK;
  }

  if (SimRandom() < FAILRATE) {
    return HWFault;
  }

  for (i = 0; i < MAXCOUNT; i++) {
    self->lCounts[i] = (long) (SimRandom() * 100);
  }
  self->lCounts[1] = self->fPreset;
  return OKOK;
}

/*-------------------------------------------------------------------------*/
static int SIMGetError(struct __COUNTER *self, int *iCode, char *error,
                       int iErrLen)
{
  strlcpy(error, "Randomly simulated counter error", iErrLen);
  *iCode = 1;
  return 1;
}

/*--------------------------------------------------------------------------*/
static int SIMTryAndFixIt(struct __COUNTER *self, int iCode)
{
  if (SimRandom() < FAILRATE) {
    return COTERM;
  }
  return COREDO;
}

/*--------------------------------------------------------------------------*/
static int SIMSet(struct __COUNTER *self, char *name, int iCter,
                  float FVal)
{
  return 1;
}

/*--------------------------------------------------------------------------*/
static int SIMGet(struct __COUNTER *self, char *name, int iCter,
                  float *fVal)
{
  *fVal = 25.999;
  return 1;
}

/*---------------------------------------------------------------------------*/
static int SIMSend(struct __COUNTER *self, char *pText,
                   char *pReply, int iReplyLen)
{
  strlcpy(pReply, "Simulated response", iReplyLen);
  return 1;
}

/*---------------------------------------------------------------------------*/
pCounterDriver NewSIMCounter(char *name, float fFail)
{
  pCounterDriver pRes = NULL;
  SimSt *pData = NULL;
  int iRet;
  int iC1, iC2, iC3;
  char *pErr;
  char pBueffel[132];

  pRes = CreateCounterDriver(name, "SIM");
  if (!pRes) {
    return NULL;
  }

  pData = (SimSt *) malloc(sizeof(SimSt));
  if (!pData) {
    DeleteCounterDriver(pRes);
    return NULL;
  }
  pData->lEnd = 0;
  pData->iPause = 0;
  pRes->pData = (void *) pData;
  pRes->iNoOfMonitors = 8;
  pRes->fTime = 0;

  /* assign functions */
  pRes->GetStatus = SIMGetStatus;
  pRes->Start = SIMStart;
  pRes->Halt = SIMHalt;
  pRes->ReadValues = SIMReadValues;
  pRes->GetError = SIMGetError;
  pRes->TryAndFixIt = SIMTryAndFixIt;
  pRes->Pause = SIMPause;
  pRes->Continue = SIMContinue;
  pRes->Set = SIMSet;
  pRes->Get = SIMGet;
  pRes->Send = SIMSend;
  pRes->KillPrivate = NULL;

  FAILRATE = fFail;
  return pRes;
}