//
//  Copyright (c) 1997, 2015 by Mike Romberg (mike-romberg@comcast.net)
//
//  This file may be distributed under terms of the GPL
//
#include "pagemeter.h"
#include "xosview.h"

#include <stdlib.h>
#include <sys/pstat.h>

PageMeter::PageMeter( XOSView *parent, float max )
    : FieldMeterDecay( parent, 3, "PAGE", "IN/OUT/IDLE" ){
    for ( int i = 0 ; i < 2 ; i++ )
        for ( int j = 0 ; j < 2 ; j++ )
            pageinfo_[j][i] = 0;

    maxspeed_ = max;
    pageindex_ = 0;
}

PageMeter::~PageMeter( void ){
}

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

    setfieldcolor( 0, parent_->getResource( "pageInColor" ) );
    setfieldcolor( 1, parent_->getResource( "pageOutColor" ) );
    setfieldcolor( 2, parent_->getResource( "pageIdleColor" ) );
    priority_ = util::stoi (parent_->getResource( "pagePriority" ) );
    maxspeed_ *= priority_ / 10.0;
    dodecay_ = parent_->isResourceTrue( "pageDecay" );
    setUsedFormat( parent_->getResource( "pageUsedFormat" ) );
}

void PageMeter::checkevent( void ){
    getpageinfo();
    drawfields(parent_->g());
}

void PageMeter::getpageinfo( void ){

    struct pst_vminfo vminfo;
    pstat_getvminfo(&vminfo, sizeof(vminfo), 1, 0);

    total_ = 0;

    pageinfo_[pageindex_][0] = vminfo.psv_spgin;
    pageinfo_[pageindex_][1] = vminfo.psv_spgout;

    int oldindex = (pageindex_+1)%2;

    for ( int i = 0; i < 2; i++ ) {
        if ( pageinfo_[oldindex][i] == 0 )
            pageinfo_[oldindex][i] = pageinfo_[pageindex_][i];

        fields_[i] = pageinfo_[pageindex_][i] - pageinfo_[oldindex][i];
        total_ += fields_[i];
    }

    if ( total_ > maxspeed_ )
        fields_[2] = 0.0;
    else {
        fields_[2] = maxspeed_ - total_;
        total_ = maxspeed_;
    }

    setUsed (total_ - fields_[2], maxspeed_ );
    pageindex_ = (pageindex_ + 1) % 2;
}
