//  
//  Copyright (c) 1994, 1995 by Mike Romberg ( romberg@fsl.noaa.gov )
//  Copyright (c) 1995, 1996, 1997-2002 by Brian Grayson (bgrayson@netbsd.org)
//
//  Most of this code was written by Werner Fink <werner@suse.de>.
//  Only small changes were made on my part (M.R.)
//  And the near-trivial port to NetBSD was done by Brian Grayson
//
//  This file may be distributed under terms of the GPL or of the BSD
//    license, whichever you choose.  The full license notices are
//    contained in the files COPYING.GPL and COPYING.BSD, which you
//    should have received.  If not, contact one of the xosview
//    authors for a copy.
//
//
// $Id$
//
#include <stdlib.h>  //  for getloadavg()
#include "general.h"
#include "loadmeter.h"
#include "xosview.h"

CVSID("$Id$");
CVSID_DOT_H(LOADMETER_H_CVSID);

LoadMeter::LoadMeter( XOSView *parent )
  : FieldMeterGraph( parent, 2, "LOAD", "PROCS per MIN/IDLE", 1, 1, 0 ){
}

LoadMeter::~LoadMeter( void ){
}

void LoadMeter::checkResources( void ){
  FieldMeterGraph::checkResources();

  procloadcol_ = parent_->allocColor(parent_->getResource( "loadProcColor" ));
  warnloadcol_ = parent_->allocColor(parent_->getResource( "loadWarnColor" ));
  critloadcol_ = parent_->allocColor(parent_->getResource( "loadCritColor" ));

  setfieldcolor( 0, procloadcol_ );
  setfieldcolor( 1, parent_->getResource( "loadIdleColor" ) );

  priority_ = atoi (parent_->getResource("loadPriority"));
  dodecay_ = parent_->isResourceTrue("loadDecay");
  useGraph_ = parent_->isResourceTrue("loadGraph");
  SetUsedFormat (parent_->getResource("loadUsedFormat"));
  warnThreshold = atoi (parent_->getResource("loadWarnThreshold"));
  critThreshold = atoi (parent_->getResource("loadCritThreshold"));

  alarmstate = lastalarmstate = 0;

  if (dodecay_){
    //  Warning:  Since the loadmeter changes scale occasionally, old
    //  decay values need to be rescaled.  However, if they are rescaled,
    //  they could go off the edge of the screen.  Thus, for now, to
    //  prevent this whole problem, the load meter can not be a decay
    //  meter.  The load is a decaying average kind of thing anyway,
    //  so having a decaying load average is redundant.
    std::cerr << "Warning:  The loadmeter can not be configured as a decay\n"
         << "  meter.  See the source code (" << __FILE__ << ") for further\n"
         << "  details.\n";
    dodecay_ = 0;
  }
}

void LoadMeter::checkevent( void ){
  getloadinfo();
  drawfields();
}

void LoadMeter::getloadinfo( void ){
  double oneMinLoad;

  getloadavg (&oneMinLoad, 1);  //  Only get the 1-minute-average sample.
  fields_[0] = oneMinLoad;  //  Convert from double to float.

  if ( fields_[0] <  warnThreshold ) alarmstate = 0;
  else
  if ( fields_[0] >= critThreshold ) alarmstate = 2;
  else
  /* if fields_[0] >= warnThreshold */ alarmstate = 1;

  if (alarmstate != lastalarmstate) {
    if ( alarmstate == 0 ) setfieldcolor( 0, procloadcol_ );
    else
    if ( alarmstate == 1 ) setfieldcolor( 0, warnloadcol_ );
    else
    /* if alarmstate == 2 */ setfieldcolor( 0, critloadcol_ );
    if (dolegends_) drawlegend();
    lastalarmstate = alarmstate;
  }
    

  //  This method of auto-adjust is better than the old way.
  //  If fields[0] is less than 20% of display, shrink display to be
  //  full-width.  Then, if full-width < 1.0, set it to be 1.0.
  if ( fields_[0]*5.0<total_ )
    total_ = fields_[0];
  else
  //  If fields[0] is larger, then set it to be 1/5th of full.
  if ( fields_[0]>total_ )
    total_ = fields_[0]*5.0;
      
  if ( total_ < 1.0)
    total_ = 1.0;
    
  fields_[1] = (float) (total_ - fields_[0]);

  /*  I don't see why anyone would want to use any format besides
   *  float, but just in case.... */
  setUsed (fields_[0], total_);
}