/* ======================================================================== *\
!
! *
! * This file is part of MARS, the MAGIC Analysis and Reconstruction
! * Software. It is distributed to you in the hope that it can be a useful
! * and timesaving tool in analysing Data of imaging Cerenkov telescopes.
! * It is distributed WITHOUT ANY WARRANTY.
! *
! * Permission to use, copy, modify and distribute this software and its
! * documentation for any purpose is hereby granted without fee,
! * provided that the above copyright notice appear in all copies and
! * that both that copyright notice and this permission notice appear
! * in supporting documentation. It is provided "as is" without express
! * or implied warranty.
! *
!
!
!   Author(s): Thomas Bretz  2002 <mailto:tbretz@astro.uni-wuerzburg.de>
!
!   Copyright: MAGIC Software Development, 2000-2002
!
!
\* ======================================================================== */

/////////////////////////////////////////////////////////////////////////////
//
// MH3
//
// With this histogram you can fill a histogram with up to three
// variables from Mars parameter containers in an eventloop.
//
// In the constructor you can give up to three variables which should be
// filled in the histogram. Dependend on the number of given variables
// (data members) a TH1F, TH2F or TH3F is created.
// Specify the data mamber like the following:
//   "MHillas.fLength"
// Where MHillas is the name of the parameter container in the parameter
// list and fLength is the name of the data member which should be filled
// in the histogram. Assuming that your MHillas container has a different
// name (MyHillas) the name to give would be:
//   "MyHillas.fLength"
//
// The axis binning is retrieved from the parameter list, too. Create a
// MBinning with the name "Binning" plus the name of your MH3 container
// plus the axis name ("X", "Y" or "Z") and add it to the parameter list.
//
// If you want to use a different unit for histogramming use SetScaleX,
// SetScaleY and SetScaleZ.
//
//
// Axis titles
// ===========
//
// 1) If no other title is given the rule for this axis is used.
// 2) If the MBinning used for this axis has a non-default Title
//    (MBinning::HasTitle) this title is used for the corresponding axis
// 3) If the MH3 has a non-default title (MH3::SetTitle called)
//    this title is set as the histogram title. It can be used to overwrite
//    the axis titles. For more information see TH1::SetTitle, eg.
//       SetTitle("MyHist;x[mm];y[cm];Counts");
//
// For example:
//   MH3 myhist("MHillas.fLength");
//   myhist.SetName("MyHist");
//   myhist.SetScaleX(geomcam.GetConvMm2Deg()); //convert length to degree
//   MBinning bins("BinningMyHistX");
//   bins.SetEdges(10, 0, 150);
//   plist.AddToList(&myhist);
//   plist.AddToList(&bins);
//
/////////////////////////////////////////////////////////////////////////////
#include "MH3.h"

#include <ctype.h>   // tolower
#include <fstream>

#include <TPad.h>
#include <TStyle.h>
#include <TCanvas.h>

#include <TH2.h>
#include <TH3.h>
#include <TProfile.h>
#include <TProfile2D.h>

#include "MLog.h"
#include "MLogManip.h"

#include "MParList.h"
#include "MBinning.h"
#include "MDataChain.h"

ClassImp(MH3);

using namespace std;

const TString MH3::gsDefName  = "MH3";
const TString MH3::gsDefTitle = "Container for a n-D Mars Histogram";

// --------------------------------------------------------------------------
//
// Default constructor.
//
MH3::MH3(const unsigned int dim)
    : fDimension(dim>3?3:dim), fHist(NULL),
    fNameProfX(Form("ProfX_%p", this)),
    fNameProfY(Form("ProfY_%p", this))
{  
    switch (fDimension)
    {
    case 1:
        fHist = new TH1F;
        fHist->SetYTitle("Counts");
        break;
    case 2:
        fHist = new TH2F;
        fHist->SetZTitle("Counts");
        break;
    case 3:
        fHist = new TH3F;
        break;
    }

    fData[0] = NULL;
    fData[1] = NULL;
    fData[2] = NULL;

    fName  = gsDefName;
    fTitle = gsDefTitle;

    if (fHist)
    {
        fHist->SetDirectory(NULL);
        fHist->UseCurrentStyle();
    }

    fScale[0] = 1;
    fScale[1] = 1;
    fScale[2] = 1;
}

// --------------------------------------------------------------------------
//
// Creates an TH1F. memberx is filled into the X-bins. For a more detailed
// description see the class description above.
//
MH3::MH3(const char *memberx)
    : fDimension(1)
{
    fHist = new TH1F;

    fData[0] = new MDataChain(memberx);
    fData[1] = NULL;
    fData[2] = NULL;

    fName  = gsDefName;
    fTitle = gsDefTitle;

    fHist->UseCurrentStyle();
    fHist->SetDirectory(NULL);
    fHist->SetYTitle("Counts");

    fScale[0] = 1;
    fScale[1] = 1;
    fScale[2] = 1;
}

// --------------------------------------------------------------------------
//
// Creates an TH2F. memberx is filled into the X-bins. membery is filled
// into the Y-bins. For a more detailed description see the class
// description above.
//
MH3::MH3(const char *memberx, const char *membery)
    : fDimension(2), fNameProfX(Form("ProjX_%p", this)), fNameProfY(Form("ProjY_%p", this))
{
    fHist = new TH2F;

    fData[0] = new MDataChain(memberx);
    fData[1] = new MDataChain(membery);
    fData[2] = NULL;

    fName  = gsDefName;
    fTitle = gsDefTitle;

    fHist->UseCurrentStyle();
    fHist->SetDirectory(NULL);
    fHist->SetZTitle("Counts");

    fScale[0] = 1;
    fScale[1] = 1;
    fScale[2] = 1;
}

// --------------------------------------------------------------------------
//
// Creates an TH3F. memberx is filled into the X-bins. membery is filled
// into the Y-bins. membery is filled into the Z-bins. For a more detailed
// description see the class description above.
//
MH3::MH3(const char *memberx, const char *membery, const char *memberz)
    : fDimension(3)
{
    fHist = new TH3F;

    fData[0] = new MDataChain(memberx);
    fData[1] = new MDataChain(membery);
    fData[2] = new MDataChain(memberz);

    fName  = gsDefName;
    fTitle = gsDefTitle;

    fHist->UseCurrentStyle();
    fHist->SetDirectory(NULL);

    fScale[0] = 1;
    fScale[1] = 1;
    fScale[2] = 1;
}

// --------------------------------------------------------------------------
//
// Deletes the histogram
//
MH3::~MH3()
{
    delete fHist;

    for (int i=0; i<3; i++)
        if (fData[i])
            delete fData[i];
}

// --------------------------------------------------------------------------
//
// Return the data members used by the data chain to be used in
// MTask::AddBranchToList
//
TString MH3::GetDataMember() const
{
    TString str=fData[0]->GetDataMember();
    if (fData[1])
    {
        str += ";";
        str += fData[1]->GetDataMember();
    }
    if (fData[2])
    {
        str += ";";
        str += fData[2]->GetDataMember();
    }
    return str;
}

// --------------------------------------------------------------------------
//
// Setup the Binning for the histograms automatically if the correct
// instances of MBinning are found in the parameter list
// For a more detailed description see class description above.
//
Bool_t MH3::SetupFill(const MParList *plist)
{
    // reset histogram (necessary if the same eventloop is run more than once) 
    fHist->Reset();

    TString bname("Binning");
    bname += fName;

    MBinning *binsx = NULL;
    MBinning *binsy = NULL;
    MBinning *binsz = NULL;

    switch (fDimension)
    {
    case 3:
        binsz = (MBinning*)plist->FindObject(bname+"Z", "MBinning");
        if (!binsz)
        {
            *fLog << err << dbginf << "MBinning '" << bname << "X' not found... aborting." << endl;
            return kFALSE;
        }
        if (fData[2] && !fData[2]->PreProcess(plist))
            return kFALSE;
        if (fData[2])
            fHist->SetZTitle(fData[2]->GetTitle());
        if (binsz->HasTitle())
            fHist->SetZTitle(binsz->GetTitle());
        if (binsz->IsLogarithmic())
            fHist->SetBit(kIsLogz);
    case 2:
        binsy = (MBinning*)plist->FindObject(bname+"Y", "MBinning");
        if (!binsy)
        {
            *fLog << err << dbginf << "MBinning '" << bname << "Y' not found... aborting." << endl;
            return kFALSE;
        }
        if (fData[1] && !fData[1]->PreProcess(plist))
            return kFALSE;
        if (fData[1])
            fHist->SetYTitle(fData[1]->GetTitle());
        if (binsy->HasTitle())
            fHist->SetYTitle(binsy->GetTitle());
        if (binsy->IsLogarithmic())
            fHist->SetBit(kIsLogy);
    case 1:
        binsx = (MBinning*)plist->FindObject(bname+"X", "MBinning");
        if (!binsx)
        {
            if (fDimension==1)
                binsx = (MBinning*)plist->FindObject(bname, "MBinning");

            if (!binsx)
            {
                *fLog << err << dbginf << "Neither MBinning '" << bname << "X' nor '" << bname << "' found... aborting." << endl;
                return kFALSE;
            }
        }
        if (fData[0] && !fData[0]->PreProcess(plist))
            return kFALSE;
        if (fData[0]!=NULL)
            fHist->SetXTitle(fData[0]->GetTitle());
        if (binsx->HasTitle())
            fHist->SetXTitle(binsx->GetTitle());
        if (binsx->IsLogarithmic())
            fHist->SetBit(kIsLogx);
    }

    TString title("Histogram for ");
    title += fName;
    title += Form(" (%dD)", fDimension);

    fHist->SetName(fName);
    fHist->SetTitle(fTitle==gsDefTitle ? title : fTitle);
    fHist->SetDirectory(0);

    switch (fDimension)
    {
    case 1:
        SetBinning(fHist, binsx);
        return kTRUE;
    case 2:
        SetBinning((TH2*)fHist, binsx, binsy);
        return kTRUE;
    case 3:
        SetBinning((TH3*)fHist, binsx, binsy, binsz);
        return kTRUE;
    }

    *fLog << err << "ERROR - MH3 has " << fDimension << " dimensions!" << endl;
    return kFALSE;
}

// --------------------------------------------------------------------------
//
// Set the name of the histogram ant the MH3 container
//
void MH3::SetName(const char *name)
{
    if (fHist)
    {
        fHist->SetName(name);
        fHist->SetDirectory(0);
    }
    MParContainer::SetName(name);
}

// --------------------------------------------------------------------------
//
// Set the title of the histogram ant the MH3 container
//
void MH3::SetTitle(const char *title)
{
    if (fHist)
        fHist->SetTitle(title);
    MParContainer::SetTitle(title);
}

// --------------------------------------------------------------------------
//
// Fills the one, two or three data members into our histogram
//
Bool_t MH3::Fill(const MParContainer *par, const Stat_t w)
{
    Double_t x=0;
    Double_t y=0;
    Double_t z=0;

    switch (fDimension)
    {
    case 3:
        z = fData[2]->GetValue()*fScale[2];
    case 2:
        y = fData[1]->GetValue()*fScale[1];
    case 1:
        x = fData[0]->GetValue()*fScale[0];
    }

    switch (fDimension)
    {
    case 3:
        ((TH3*)fHist)->Fill(x, y, z, w);
        return kTRUE;
    case 2:
        ((TH2*)fHist)->Fill(x, y, w);
        return kTRUE;
    case 1:
        fHist->Fill(x, w);
        return kTRUE;
    }

    return kFALSE;
}
/*
// --------------------------------------------------------------------------
//
// Set the palette you wanna use:
//  - you could set the root "Pretty Palette Violet->Red" by
//    gStyle->SetPalette(1, 0), but in some cases this may look
//    confusing
//  - The maximum colors root allowes us to set by ourself
//    is 50 (idx: 51-100). This colors are set to a grayscaled
//    palette
//  - the number of contours must be two less than the number
//    of palette entries
//
void MHStarMap::PrepareDrawing() const
{
    const Int_t numg = 32; // number of gray scaled colors
    const Int_t numw = 32; // number of white

    Int_t palette[numg+numw];

    //
    // The first half of the colors are white.
    // This is some kind of optical background supression
    //
    gROOT->GetColor(51)->SetRGB(1, 1, 1);

    Int_t i;
    for (i=0; i<numw; i++)
        palette[i] = 51;

    //
    // now the (gray) scaled part is coming
    //
    for (;i<numw+numg; i++)
    {
        const Float_t gray = 1.0-(float)(i-numw)/(numg-1.0);

        gROOT->GetColor(52+i)->SetRGB(gray, gray, gray);
        palette[i] = 52+i;
    }

    //
    // Set the palette and the number of contour levels
    //
    gStyle->SetPalette(numg+numw, palette);
    fStarMap->SetContour(numg+numw-2);
}
*/
// --------------------------------------------------------------------------
//
// Setup a inversed deep blue sea palette for the fCenter histogram.
//
void MH3::SetColors() const
{
    // FIXME: This must be redone each time the canvas is repainted....
    gStyle->SetPalette(51, NULL);
    Int_t c[50];
    for (int i=0; i<50; i++)
        c[49-i] = gStyle->GetColorPalette(i);
    gStyle->SetPalette(50, c);
}

void MH3::Paint(Option_t *o)
{
    TString str(o);

    // FIXME: Do it in Paint()
    if (str.Contains("COL", TString::kIgnoreCase))
        SetColors();

    if (fHist->TestBit(kIsLogx) && fHist->GetEntries()>0) gPad->SetLogx();
    if (fHist->TestBit(kIsLogy) && fHist->GetEntries()>0) gPad->SetLogy();
    if (fHist->TestBit(kIsLogz) && fHist->GetEntries()>0) gPad->SetLogz();

    // Set pretty color palette
    gStyle->SetPalette(1, 0);

    TVirtualPad *padsave = gPad;

    TProfile* h0;
    if ((h0 = (TProfile*)gPad->FindObject(fNameProfX)))
    {
        // Get projection for range
        TProfile *p = ((TH2*)fHist)->ProfileX(fNameProfX, -1, 9999, "s");

        // Move contents from projection to h3
        h0->Reset();
        h0->Add(p);
        delete p;

        // Set Minimum as minimum value Greater Than 0
        //h0->SetMinimum(GetMinimumGT(*h0));
    }
    if ((h0 = (TProfile*)gPad->FindObject(fNameProfY)))
    {
        // Get projection for range
        TProfile *p = ((TH2*)fHist)->ProfileY(fNameProfY, -1, 9999, "s");

        // Move contents from projection to h3
        h0->Reset();
        h0->Add(p);
        delete p;

        // Set Minimum as minimum value Greater Than 0
        //h0->SetMinimum(GetMinimumGT(*h0));
    }

    gPad = padsave;
}

// --------------------------------------------------------------------------
//
// Creates a new canvas and draws the histogram into it.
//
// Possible options are:
//   PROFX: Draw a x-profile into the histogram (for 2D histograms only)
//   PROFY: Draw a y-profile into the histogram (for 2D histograms only)
//   ONLY:  Draw the profile histogram only (for 2D histograms only)
//
// If the kIsLog?-Bit is set the axis is displayed lkogarithmically.
// eg this is set when applying a logarithmic MBinning
//
// Be careful: The histogram belongs to this object and won't get deleted
// together with the canvas.
//
void MH3::Draw(Option_t *opt)
{
    TVirtualPad *pad = gPad ? gPad : MakeDefCanvas(fHist);
    pad->SetBorderMode(0);

    fHist->SetFillStyle(4000);

    TString str(opt);
    str = str.Strip(TString::kBoth);

    Bool_t only = str.Contains("ONLY", TString::kIgnoreCase) && fDimension==2;
    // FIXME: We may have to remove all our own options from str!
    if (!only)
        fHist->Draw(str);

    if (str.Contains("PROFX", TString::kIgnoreCase) && fDimension==2)
    {
        TProfile *p = ((TH2*)fHist)->ProfileX(fNameProfX, -1, 9999, "s");
        p->SetLineColor(kBlue);
        p->Draw(only?"":"same");
        p->SetBit(kCanDelete);
        p->SetDirectory(NULL);
    }
    if (str.Contains("PROFY", TString::kIgnoreCase) && fDimension==2)
    {
        TProfile *p = ((TH2*)fHist)->ProfileY(fNameProfY, -1, 9999, "s");
        p->SetLineColor(kBlue);
        p->Draw(only?"":"same");
        p->SetBit(kCanDelete);
        p->SetDirectory(NULL);
    }

    AppendPad("");
}

// --------------------------------------------------------------------------
//
// Implementation of SavePrimitive. Used to write the call to a constructor
// to a macro. In the original root implementation it is used to write
// gui elements to a macro-file.
//
void MH3::StreamPrimitive(ofstream &out) const
{
    TString name = GetUniqueName();

    out << "   MH3 " << name << "(\"";
    out << fData[0]->GetRule() << "\"";
    if (fDimension>1)
        out << ", \"" << fData[1]->GetRule() << "\"";
    if (fDimension>2)
        out << ", \"" << fData[2]->GetRule() << "\"";

    out << ");" << endl;

    if (fName!=gsDefName)
        out << "   " << name << ".SetName(\"" << fName << "\");" << endl;

    if (fTitle!=gsDefTitle)
        out << "   " << name << ".SetTitle(\"" << fTitle << "\");" << endl;

    switch (fDimension)
    {
    case 3:
        if (fScale[2]!=1)
            out << "   " << name << ".SetScaleZ(" << fScale[2] << ");" << endl;
    case 2:
        if (fScale[1]!=1)
            out << "   " << name << ".SetScaleY(" << fScale[1] << ");" << endl;
    case 1:
        if (fScale[0]!=1)
            out << "   " << name << ".SetScaleX(" << fScale[0] << ");" << endl;
    }
}

// --------------------------------------------------------------------------
//
// Used to rebuild a MH3 object of the same type (data members,
// dimension, ...)
//
MParContainer *MH3::New() const
{
    MH3 *h = NULL;

    if (fData[0] == NULL)
        h=new MH3(fDimension);
    else
        switch (fDimension)
        {
        case 1:
            h=new MH3(fData[0]->GetRule());
            break;
        case 2:
            h=new MH3(fData[0]->GetRule(), fData[1]->GetRule());
            break;
        case 3:
            h=new MH3(fData[0]->GetRule(), fData[1]->GetRule(), fData[2]->GetRule());
            break;
        }
    switch (fDimension)
    {
    case 3:
        h->SetScaleZ(fScale[2]);
    case 2:
        h->SetScaleY(fScale[1]);
    case 1:
        h->SetScaleX(fScale[0]);
    }
    return h;
}

TString MH3::GetRule(const Char_t axis) const
{
    switch (tolower(axis))
    {
    case 'x':
        return fData[0] ? fData[0]->GetRule() : TString("");
    case 'y':
        return fData[1] ? fData[1]->GetRule() : TString("");
    case 'z':
        return fData[2] ? fData[2]->GetRule() : TString("");
    default:
        return "<n/a>";
    }
}

// --------------------------------------------------------------------------
//
// Returns the total number of bins in a histogram (excluding under- and
// overflow bins)
//
Int_t MH3::GetNbins() const
{
    Int_t num = 1;

    switch (fDimension)
    {
    case 3:
        num *= fHist->GetNbinsZ()+2;
    case 2:
        num *= fHist->GetNbinsY()+2;
    case 1:
        num *= fHist->GetNbinsX()+2;
    }

    return num;
}

// --------------------------------------------------------------------------
//
// Returns the total number of bins in a histogram (excluding under- and
// overflow bins) Return -1 if bin is underflow or overflow
//
Int_t MH3::FindFixBin(Double_t x, Double_t y, Double_t z) const
{
    const TAxis &axex = *fHist->GetXaxis();
    const TAxis &axey = *fHist->GetYaxis();
    const TAxis &axez = *fHist->GetZaxis();

    Int_t binz = 0;
    Int_t biny = 0;
    Int_t binx = 0;

    switch (fDimension)
    {
    case 3:
        binz = axez.FindFixBin(z);
        if (binz>axez.GetLast() || binz<axez.GetFirst())
            return -1;
    case 2:
        biny = axey.FindFixBin(y);
        if (biny>axey.GetLast() || biny<axey.GetFirst())
            return -1;
    case 1:
        binx = axex.FindFixBin(x);
        if (binx<axex.GetFirst() || binx>axex.GetLast())
            return -1;
    }

    const Int_t nx = fHist->GetNbinsX()+2;
    const Int_t ny = fHist->GetNbinsY()+2;

    return binx + nx*(biny +ny*binz);
}