#include "AliHBTEvent.h"
#include "AliHBTParticle.h"

ClassImp(AliHBTEvent)

const UInt_t AliHBTEvent::fgkInitEventSize = 10000;



/**************************************************************************/ 
 
AliHBTEvent::AliHBTEvent()
 {
    if(fgkInitEventSize<1) 
     {
      Fatal("AliHBTEvent::AliHBTEvent()",
            "fgkInitEventSize has a stiupid value (%d). Change it to positive number and recompile",
             fgkInitEventSize);
      
     }
    fSize=fgkInitEventSize;
    fParticles = new AliHBTParticle* [fSize];
    fNParticles = 0;
    fOwner = kTRUE;
 }
/**************************************************************************/ 

AliHBTEvent::~AliHBTEvent()
 {
   this->Reset();//delete all particles
   if(fParticles)
    { 
     delete [] fParticles; //and delete array itself
    }
   fParticles = 0x0;
 }
/**************************************************************************/ 
void  AliHBTEvent::Reset()
{
  //deletes all particles from the event
  if(fParticles && fOwner)
    {
      for(Int_t i =0; i<fNParticles; i++)
        delete fParticles[i];
    }
   fNParticles = 0;
} 

AliHBTParticle* AliHBTEvent::GetParticleSafely(Int_t n)
 {
   if( (n<0) || (fNParticles<=n) ) return 0x0;
   else return fParticles[n];
   
 }
/**************************************************************************/ 

void  AliHBTEvent:: AddParticle(AliHBTParticle* hbtpart)
 {
   //Adds new perticle to the event
   if ( fNParticles+1 >= fSize) Expand(); //if there is no space in array, expand it
   fParticles[fNParticles++] = hbtpart; //add a pointer
 }

/**************************************************************************/ 
void  AliHBTEvent::AddParticle(TParticle* part)
 {
   AddParticle( new AliHBTParticle(*part) );
 }
/**************************************************************************/ 
void  AliHBTEvent::
AddParticle(Int_t pdg, Double_t px, Double_t py, Double_t pz, Double_t etot,
            Double_t vx, Double_t vy, Double_t vz, Double_t time)
 {
   AddParticle(new  AliHBTParticle(pdg,px,py,pz,etot,vx,vy,vz,time) );
 }
/**************************************************************************/ 

void AliHBTEvent::Expand()
 {
 //expands the array with pointers to particles
 //about the size defined in fgkInitEventSize
 
  fSize+=fgkInitEventSize;
  AliHBTParticle** tmpParticles = new AliHBTParticle* [fSize]; //create new array of pointers
  //check if we got memory / if not Abort
  if (!tmpParticles) Fatal("AliHBTEvent::Expand()","No more space in memory");
  
  
  for(Int_t i = 0; i<fNParticles ;i++)
   //copy pointers to the new array
   {
     tmpParticles[i] = fParticles[i];
   }
  delete [] fParticles; //delete old array
   fParticles = tmpParticles; //copy new pointer to the array of pointers to particles
  
 }