// $Id$
// Category: sector
//
// Class AliMpRowSegment
// ---------------------
// Class describing a row segment composed of the 
// the identic motifs.
//
// Authors: David Guez, Ivana Hrivnacova; IPN Orsay

#include <TError.h>
#include <TMath.h>

#include "AliMpRowSegment.h"
#include "AliMpRow.h"
#include "AliMpVMotif.h"
#include "AliMpMotifType.h"
#include "AliMpMotifTypePadIterator.h"
#include "AliMpMotifMap.h"
#include "AliMpMotifPosition.h"

ClassImp(AliMpRowSegment)

//_____________________________________________________________________________
AliMpRowSegment::AliMpRowSegment(AliMpRow* row, AliMpVMotif* motif, 
                                 AliMpIntPair padOffset, 
                                 Int_t nofMotifs,
                                 Int_t motifPositionId, Int_t motifPositionDId)
  : AliMpVRowSegment(),
    fNofMotifs(nofMotifs),
    fPadOffset(padOffset),
    fOffset(TVector2()),
    fRow(row),
    fMotif(motif),
    fMotifPositionId(motifPositionId),
    fMotifPositionDId(motifPositionDId)
{
// 
  // Keep pad offset in the low indices limits
  SetLowIndicesLimit(padOffset);
}

//_____________________________________________________________________________
AliMpRowSegment::AliMpRowSegment() 
  : AliMpVRowSegment(),
    fNofMotifs(0),
    fPadOffset(AliMpIntPair()),
    fOffset(TVector2()),
    fRow(0),
    fMotif(0),
    fMotifPositionId(0),
    fMotifPositionDId(0)
{
//
}

//_____________________________________________________________________________
AliMpRowSegment::~AliMpRowSegment() {
//  
}

//
// private methods  
//

//_____________________________________________________________________________
Double_t AliMpRowSegment::FirstMotifCenterX() const
{
// Returns the x coordinate of the first motif center
// in global coordinate system.
// ---

  return fOffset.X();
}  

//_____________________________________________________________________________
Double_t AliMpRowSegment::LastMotifCenterX() const
{
// Returns the x coordinate of the last motif center
// in global coordinate system.
// ---

  return fOffset.X() + 2.*(fNofMotifs-1)*fMotif->Dimensions().X();
}

//_____________________________________________________________________________
Double_t AliMpRowSegment::MotifCenterX(Int_t motifPositionId) const
{
// Returns the x coordinate of the motif specified with
// the given position identifier.
// ---

  // Check if x is in the row segment range
  if (! HasMotifPosition(motifPositionId)) {
    Error("MotifCenterX", "Outside row segment region");
    return 0;
  }
  
  // Find the position number in the segment  
  Int_t num = (motifPositionId - fMotifPositionId) *  fMotifPositionDId;

  return fOffset.X() + num*(fMotif->Dimensions().X() * 2.0);
}

//_____________________________________________________________________________
Double_t AliMpRowSegment::MotifCenterY(Int_t motifPositionId) const
{
// Returns the y coordinate of the motif specified with
// the given position identifier.
// ---

  // Check if x is in the row segment range
  if (! HasMotifPosition(motifPositionId)) {
    Error("MotifCenterY", "Outside row segment region");
    return 0;
  }
  
  return GetRow()->Position().Y() + fOffset.Y();
}

//_____________________________________________________________________________
Bool_t AliMpRowSegment::IsInside(const TVector2& position, Bool_t warn) const
{
// Checks if the position is inside some motif of this row segment.
// ---

  Double_t minY = GetRow()->Position().Y() + fOffset.Y() - fMotif->Dimensions().Y();
  Double_t maxY = GetRow()->Position().Y() + fOffset.Y() + fMotif->Dimensions().Y();

  if ( position.X() < LeftBorderX() || position.X() > RightBorderX() ||
       position.Y() < minY || position.Y() > maxY ) {

    if (warn) Error("MotifPositionId", "Outside row segment region");
    return false;
  }
  else
    return true;
}    

//
// public methods  
//

//_____________________________________________________________________________
Double_t  AliMpRowSegment::LeftBorderX() const
{
// Returns the x coordinate of the left row segment border
// in global coordinate system.
// ---

  return FirstMotifCenterX() - fMotif->Dimensions().X();
}

//_____________________________________________________________________________
Double_t  AliMpRowSegment::RightBorderX() const
{
// Returns the x coordinate of the right row segment border
// in global coordinate system.
// ---

  return LastMotifCenterX() + fMotif->Dimensions().X();
}

//_____________________________________________________________________________
Double_t  AliMpRowSegment::HalfSizeY() const
{
// Returns the size in y of this row segment.
// ---

  return fMotif->Dimensions().Y() + fOffset.Y();
}

//_____________________________________________________________________________
AliMpVMotif*  AliMpRowSegment::FindMotif(const TVector2& position) const
{
// Returns the motif of this row; 
// ---

  if (IsInside(position, false))
    return fMotif;
  else  
    return 0;
}  

//_____________________________________________________________________________
Int_t AliMpRowSegment::FindMotifPositionId(const TVector2& position) const
{
// Returns the motif position identified for the given
// geometric position.
// ---

  if (!IsInside(position, false)) return 0;

  // Find the position number in the segment  
  Int_t num 
    = Int_t((position.X() - LeftBorderX()) / (fMotif->Dimensions().X() * 2.0));

  // Calculate the position Id
  return fMotifPositionId + num*fMotifPositionDId;  
}

//_____________________________________________________________________________
Bool_t AliMpRowSegment::HasMotifPosition(Int_t motifPositionId) const
{
// Returns true if the motif specified with the given position identifier
// is in this segment.
// ---

  Int_t minId = TMath::Min(fMotifPositionId, 
                    fMotifPositionId + (fNofMotifs-1)*fMotifPositionDId);
  Int_t maxId = TMath::Max(fMotifPositionId, 
                    fMotifPositionId + (fNofMotifs-1)*fMotifPositionDId);

  if (motifPositionId >= minId && motifPositionId <= maxId) {
    return true;
  }
  else 
    return false;
}

//_____________________________________________________________________________
TVector2 AliMpRowSegment::MotifCenter(Int_t motifPositionId) const
{
// Returns the coordinates of the motif specified with
// the given position identifier.
// ---

  return TVector2(MotifCenterX(motifPositionId), MotifCenterY(motifPositionId));
}

//_____________________________________________________________________________
TVector2 AliMpRowSegment::Position() const
{
// Returns the position of the row segment centre.
// ---

  Double_t x = (LeftBorderX() + RightBorderX())/2.;		    
  Double_t y = GetRow()->Position().Y();  
    
  return TVector2(x, y);   
}


//_____________________________________________________________________________
TVector2 AliMpRowSegment::Dimensions() const
{
// Returns the halflengths of the row segment in x, y.
// ---

  Double_t x = (RightBorderX() - LeftBorderX())/2.;		    
  Double_t y = GetRow()->Dimensions().Y();  
    
  return TVector2(x, y);   
}

//_____________________________________________________________________________
void   AliMpRowSegment::SetOffset(const TVector2& offset)
{
// Calculates offset from given offset and 
// stored offset in pads.
// ---

  AliMpMotifTypePadIterator iter(fMotif->GetMotifType());
  iter.First();
  AliMpIntPair localPos = iter.CurrentItem().GetIndices();
     
  Double_t offsetX 
     = offset.X() 
       + 2.*fPadOffset.GetFirst() * fMotif->GetPadDimensions(localPos).X() 
       + fMotif->Dimensions().X(); 

  Double_t offsetY 
    = offset.Y()
      + fPadOffset.GetSecond() * fMotif->GetPadDimensions(localPos).Y(); 

  fOffset = TVector2(offsetX, offsetY);
}

//_____________________________________________________________________________
void AliMpRowSegment::SetGlobalIndices()
{
// Sets indices limits.
// ---

  AliMpMotifPosition* firstPos
    = GetRow()->GetMotifMap()
        ->FindMotifPosition(GetMotifPositionId(0));
  
  AliMpMotifPosition* lastPos
    = GetRow()->GetMotifMap()
        ->FindMotifPosition(GetMotifPositionId(GetNofMotifs()-1));
         
  // Check if the motif positions has the limits set
  if ( !firstPos->HasValidIndices() || !lastPos->HasValidIndices())
    Fatal("SetGlobalIndices", "Indices of motif positions have to be set first.");
            
  SetLowIndicesLimit(firstPos->GetLowIndicesLimit());
  SetHighIndicesLimit(lastPos->GetHighIndicesLimit());
}  

//_____________________________________________________________________________
Int_t AliMpRowSegment::SetIndicesToMotifPosition(Int_t i, 
                                 const AliMpIntPair& indices)
{
// Sets global indices to i-th motif position and returns next index
// in x.
// ---

  // Get motif position
  AliMpMotifPosition* motifPosition
    = GetRow()->GetMotifMap()->FindMotifPosition(GetMotifPositionId(i));

  // Low limit
  AliMpIntPair low = indices + AliMpIntPair(0, GetLowIndicesLimit().GetSecond());
  motifPosition->SetLowIndicesLimit(low);
	  
  // High limit
  AliMpMotifType* motifType = motifPosition->GetMotif()->GetMotifType();    
  AliMpIntPair high
    = motifPosition->GetLowIndicesLimit() 
      + AliMpIntPair(motifType->GetNofPadsX()-1, motifType->GetNofPadsY()-1);
  motifPosition->SetHighIndicesLimit(high);

  // Return next index in x
  return high.GetFirst()+1;
  // return motifType->GetNofPadsX();
}


//_____________________________________________________________________________
AliMpRow*  AliMpRowSegment::GetRow() const
{
// Returns the row.which this row segment belongs to.
// ---

  return fRow;
}  

//_____________________________________________________________________________
Int_t  AliMpRowSegment::GetNofMotifs() const
{
// Returns number of motifs in this this row segment.
// ---

  return fNofMotifs;
}  

//_____________________________________________________________________________
Int_t  AliMpRowSegment::GetMotifPositionId(Int_t i) const
{
// Returns number of motifs in this this row segment.
// ---

  return fMotifPositionId + i*fMotifPositionDId;
}  

//_____________________________________________________________________________
AliMpVMotif*  AliMpRowSegment::GetMotif(Int_t /*i*/) const
{
// Returns the motif of this row segment.
// ---

  return fMotif;
}