//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
//
// SprayParticleGun
//
// Implementation of test particle gun
//

#include "SprayParticleGun.hh"
#include "SprayParticleGunMessenger.hh"

#include "G4PrimaryParticle.hh"
#include "G4ParticleTypes.hh"
#include "G4Event.hh"

//
// Constructor (no arguments)
//
SprayParticleGun::SprayParticleGun()
{
	SetDefaults();
}

//
// Constructor (position specified)
//
SprayParticleGun::SprayParticleGun( G4ThreeVector inStart )
{
	SetDefaults();
	start = inStart;
}

//
// Destructor
//
SprayParticleGun::~SprayParticleGun() {
	delete messenger;
}

//
// SetDefaults
//
// Set default parameters
//
void SprayParticleGun::SetDefaults()
{
	start = G4ThreeVector(0,0,0);
	spray[0] = 7;
	spray[1] = 7;
	spray[2] = 2;
	
	particleType = G4Geantino::GeantinoDefinition();
	
  	messenger = new SprayParticleGunMessenger(this);
}

//
// GeneratePrimaryVertex
//
// Make the event
//
void SprayParticleGun::GeneratePrimaryVertex( G4Event *evt )
{
	//
	// Create a new vertex
	//
	G4PrimaryVertex *vertex = new G4PrimaryVertex( start, 0.0 );
	
	//
	// Loop over the three dimensions, creating particles
	// as specified
	//
	G4double px = -1.0;
	G4int    ix = 1;
	do {
		if (!(spray[0]&ix)) continue;
		
		G4double py = -1.0;
		G4int    iy = 1;
		do {
			if (!(spray[1]&iy)) continue;
		
			G4double pz = -1.0;
			G4int    iz = 1; 
			do {
				if (!(spray[2]&iz)) continue;
			
				if (ix==2 && iy==2 && iz==2) continue;
				
				G4PrimaryParticle *particle = new G4PrimaryParticle( particleType, px, py, pz );
				vertex->SetPrimary( particle );
			} while( pz += 1.0, iz <<= 1, iz < 8 );
		} while( py += 1.0, iy <<= 1, iy < 8 );
	} while( px += 1.0, ix <<= 1, ix < 8 );

	//
	// Give this sucker to the event
	//
	evt->AddPrimaryVertex( vertex );
}