// debugLevel.cc -- Illustration of using the debugVerbosityLevel features of
//			ErrorLogger mechanism.
//
// Based on basicUsage.cc
//
// This example program is in two logical pieces:
//
//	First we show the user code -- many physicist users could contribute
//	code of this nature, using errlog in the manner shown.
//
//	Then we show the framework code that would support this.  One
//	programmer sets up this framework to coordinate all code.  The
//	framework controls things like which output destinations exist and
//	what sort of messages to pass to each destination -- and in this
//	case, debug verbosity levels.
//

// -----------------
// Physicsists' Code
// -----------------

#include "debugLevel.h"
#include "ErrorLogger/ErrorLog.h"

void DoPhysics::operator()( Event & event )  {

  static int v;
  // THIS METHOD IS WHERE ALL THE PHYSICS CALCULATION WOULD GO.

  errlog( ELsuccess, "An Event" ) << "data = " << event.data << endmsg;

  if ( (event.data&1)==0 ) {
    v = event.data/2;
    errlog.setDebugVerbosity (v);
    // Note -- this is good for the test program. 
    // But normally, the framework should take care of all setting of
    // verbosity etc. for the errlog -- not the physicist code.
  } 

  if ( ( event.data==11) ) {
    errlog.setDebugMessages (ELwarning, "fixit");
  }

  for (int i = 0; i <= 10; i++) {
    errlog (i) << "verbosity level is " << v << " debug level is " << i << 
									endmsg;
  }

  errlog (ELsuccess, "Event Finished") << "event # " << event.data << endmsg;

} // DoPhysics::operator()(event)

// ---------------
// Framework Code
// ---------------

#include "ErrorLogger/ELadministrator.h"
#include "ErrorLogger/ELdestControl.h"
#include "ErrorLogger/ELoutput.h"
#include "ErrorLogger/ELstatistics.h"

#include "ZMutility/iostream"
USING( std::cout )

Module::Module( const std::string & name )  {
  errlog.setModule( name );	
}

int main()  {

  ELadministrator * logger = ELadministrator::instance();
    // instantiate a logger object

  ELoutput      outputD( cout );                      
  ELdestControl output ( logger->attach(outputD) );   
  output.setThreshold  ( ELzeroSeverity );     	      

  ELstatistics  statsD( cout );			      // a statistics dest
  ELdestControl stats ( logger->attach(statsD) );     // tell logger about it

  // The following is a list of the modules in this program:
  DoPhysics  doPhysics(  "PHYSICS CODE" );
	// There is only one module in this illustration.

  int n;
  for ( n = 1;  n < 20;  ++n )  {
    Event event( n );
    doPhysics( event );
    if (n%8 == 0) {
      stats.summary( output, "Error Statistics So Far" );
    }
  }

  return 0;

}  // main()