#ifndef MARS_MHMatrix
#define MARS_MHMatrix

#ifdef MARS_MLogManip
#error Please make ensure that MLogManip.h are included _after_ MHMatrix.h
#endif

#ifndef ROOT_TMatrix
#include <TMatrix.h>
#endif
#ifndef MARS_MH
#include "MH.h"
#endif

class TArrayI;

class MTask;
class MParList;
class MDataArray;

class MHMatrix : public MH
{
private:
    static const TString gsDefName;  //! Default Name
    static const TString gsDefTitle; //! Default Title

    Int_t   fNumRow;    //! Number of dimensions of histogram
    Int_t   fRow;       //! Present row
    TMatrix fM;         // Matrix to be filled

    TMatrix fM2;        //! Covariance Matrix

    MDataArray *fData;  // List of data members (columns)

    enum {
        kIsOwner  = BIT(14),
        kIsLocked = BIT(16)
    };

    void AddRow();

    Bool_t SetupFill(const MParList *pList);
    Bool_t Fill(const MParContainer *par);
    Bool_t Finalize();

    void StreamPrimitive(ofstream &out) const;

public:
    MHMatrix(const char *name=NULL, const char *title=NULL);
    MHMatrix(MDataArray *mat, const char *name=NULL, const char *title=NULL);
    ~MHMatrix();

    void Lock()   { SetBit(kIsLocked); }
    void Unlock() { ResetBit(kIsLocked); }

    Int_t AddColumn(const char *name);
    void AddColumns(MDataArray *mat);

    MDataArray *GetColumns() { return fData; }

    const TMatrix &GetM() const { return fM; }

    Bool_t IsValid() const { return fM.IsValid(); }
    Int_t  GetNumRows() const { return fNumRow; }

    //void Draw(Option_t *opt=NULL);
    //TObject *DrawClone(Option_t *opt=NULL) const;

    void Print(Option_t *) const;

    const TMatrix *InvertPosDef();

    Double_t CalcDist(const TMatrix &m, const TVector &v, Int_t num = 25) const;
    Double_t CalcDist(const TVector &v, Int_t num = 25);

    void SetOwner(Bool_t b=kTRUE) { b ? SetBit(kIsOwner) : ResetBit(kIsOwner); }

    void Reassign();

    const TArrayI GetIndexOfSortedColumn(Int_t ncol=0, Bool_t desc=kTRUE) const;
    void SortMatrixByColumn(Int_t ncol=0, Bool_t desc=kTRUE);

    Bool_t SetNumRow(Int_t row) { if (row>=fNumRow || row<0) return kFALSE; fRow = row; return kTRUE; }
    Int_t GetNumRow() const { return fRow; };
    Double_t operator[](Int_t col) { return fM(fRow, col); }

    Bool_t Fill(MParList *plist, MTask *read);

    TString GetDataMember() const;

    void ReduceNumberOfRows(UInt_t numrows, const TString opt);

    ClassDef(MHMatrix, 1) // Multidimensional Matrix to store events
};

#endif