//  
//  Copyright (c) 1994, 1995, 1997 by Mike Romberg ( romberg@fsl.noaa.gov )
//
//  This file may be distributed under terms of the GPL
//

#include "loadmeter.h"
#include "xosview.h"
#include <stdlib.h>
#include <sys/pstat.h>

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

LoadMeter::~LoadMeter( void ){
}

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

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

  setfieldcolor( 0, procloadcol_ );
  setfieldcolor( 1, parent_->getResource( "loadIdleColor" ) );
  priority_ = atoi (parent_->getResource( "loadPriority" ) );
  dodecay_ = parent_->isResourceTrue( "loadDecay" );
  SetUsedFormat( parent_->getResource( "loadUsedFormat" ));

  alarmThreshold = atoi (parent_->getResource("loadAlarmThreshold"));

  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 ){

  struct pst_dynamic pstd; 

  pstat_getdynamic(&pstd, sizeof(pstd), 1, 0);

  fields_[0] = pstd.psd_avg_1_min;

  if ( fields_[0] > alarmThreshold ) {
    if (total_ == alarmThreshold ) {
      setfieldcolor( 0, warnloadcol_ );
      drawlegend();
    }
    total_ = fields_[1] = 20;
  } else {
    if (total_ == 20 ) {
      setfieldcolor( 0, procloadcol_ );
      drawlegend();
    }
    total_ = fields_[1] = alarmThreshold;
  }

  setUsed( fields_[0], total_ );
}