// $Id$
// splitted from AliHLTConfiguration.cxx,v 1.25 2007/10/12 13:24:47
/**************************************************************************
 * This file is property of and copyright by the ALICE HLT Project        * 
 * ALICE Experiment at CERN, All rights reserved.                         *
 *                                                                        *
 * Primary Authors: Matthias Richter <Matthias.Richter@ift.uib.no>        *
 *                  for The ALICE HLT Project.                            *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/** @file   AliHLTConfigurationHandler.cxx
    @author Matthias Richter
    @date   
    @brief  Implementation of HLT tasks.
*/

// see header file for class documentation
// or
// refer to README to build package
// or
// visit http://web.ift.uib.no/~kjeks/doc/alice-hlt

#if __GNUC__>= 3
using namespace std;
#endif

#include <cerrno>
#include <iostream>
#include <string>
#include "AliHLTConfigurationHandler.h"
#include "AliHLTConfiguration.h"

/** ROOT macro for the implementation of ROOT specific class methods */
ClassImp(AliHLTConfigurationHandler)

AliHLTConfigurationHandler::AliHLTConfigurationHandler()
  :
  fgListConfigurations()
{
  // see header file for class documentation
  // or
  // refer to README to build package
  // or
  // visit http://web.ift.uib.no/~kjeks/doc/alice-hlt
  SetLocalLoggingLevel(kHLTLogInfo);
}

AliHLTConfigurationHandler::~AliHLTConfigurationHandler()
{
  // see header file for function documentation
  TObjLink* lnk=NULL;
  while ((lnk=fgListConfigurations.FirstLink())!=NULL) {
    AliHLTConfiguration* pConf=(AliHLTConfiguration*)lnk->GetObject();
    HLTDebug("delete configuration \"%s\"", pConf->GetName());
    fgListConfigurations.Remove(lnk);
    delete pConf;
  }
}

int AliHLTConfigurationHandler::RegisterConfiguration(AliHLTConfiguration* pConf)
{
  // see header file for function documentation
  int iResult=0;
  if (pConf) {
    if (FindConfiguration(pConf->GetName()) == NULL) {
      AliHLTConfiguration* pClone=new AliHLTConfiguration(*pConf);
      fgListConfigurations.Add(pClone);
      HLTDebug("configuration \"%s\" (%p) registered from %p", pClone->GetName(), pClone, pConf);

      // mark all configurations with unresolved dependencies for re-evaluation
      TObjLink* lnk=fgListConfigurations.FirstLink();
      while (lnk) {
	AliHLTConfiguration* pSrc=(AliHLTConfiguration*)lnk->GetObject();
	if (pSrc && pSrc!=pClone && pSrc->SourcesResolved()!=1) {
	  pSrc->InvalidateSources();
	}
	lnk=lnk->Next();
      }
    } else {
      iResult=-EEXIST;
      HLTWarning("configuration \"%s\" already registered", pConf->GetName());
    }
  } else {
    iResult=-EINVAL;
  }
  return iResult;
}

int AliHLTConfigurationHandler::CreateConfiguration(const char* id, const char* component, const char* sources, const char* arguments)
{
  // see header file for function documentation
  int iResult=0;
  AliHLTConfiguration* pConf= new AliHLTConfiguration(id, component, sources, arguments);
  if (pConf) {
    // the configuration will be registered automatically, if this failes the configuration
    // is missing -> delete it
    if (FindConfiguration(id)==NULL) {
      delete pConf;
      pConf=NULL;
      iResult=-EEXIST;
    }
  } else {
    HLTError("system error: object allocation failed");
    iResult=-ENOMEM;
  }
  return iResult;
}

void AliHLTConfigurationHandler::PrintConfigurations()
{
  // see header file for function documentation
  HLTLogKeyword("configuration listing");
  HLTMessage("registered configurations:");
  TObjLink *lnk = fgListConfigurations.FirstLink();
  while (lnk) {
    TObject *obj = lnk->GetObject();
    HLTMessage("  %s", obj->GetName());
    lnk = lnk->Next();
  }
}

int AliHLTConfigurationHandler::RemoveConfiguration(const char* id)
{
  // see header file for function documentation
  int iResult=0;
  if (id) {
    AliHLTConfiguration* pConf=NULL;
    if ((pConf=FindConfiguration(id))!=NULL) {
      iResult=RemoveConfiguration(pConf);
      delete pConf;
      pConf=NULL;
    } else {
      HLTWarning("can not find configuration \"%s\"", id);
      iResult=-ENOENT;
    }
  } else {
    iResult=-EINVAL;
  }
  return iResult;
}

int AliHLTConfigurationHandler::RemoveConfiguration(AliHLTConfiguration* pConf)
{
  // see header file for function documentation
  int iResult=0;
  if (pConf) {
    // remove the configuration from the list
    HLTDebug("remove configuration \"%s\"", pConf->GetName());
    fgListConfigurations.Remove(pConf);
    // remove cross links in the remaining configurations
    TObjLink* lnk=fgListConfigurations.FirstLink();
    while (lnk && iResult>=0) {
      AliHLTConfiguration* pRem=(AliHLTConfiguration*)lnk->GetObject();
      if (pRem) {
	pRem->InvalidateSource(pConf);
      } else {
	iResult=-EFAULT;
      }
      lnk=lnk->Next();
    }
  }
  return iResult;
}

AliHLTConfiguration* AliHLTConfigurationHandler::FindConfiguration(const char* id)
{
  // see header file for function documentation
  AliHLTConfiguration* pConf=NULL;
  if (id) {
    pConf=(AliHLTConfiguration*)fgListConfigurations.FindObject(id); 
  }
  return pConf;
}