#include <iostream>
#include <cassert>
#include <sstream>
#include <cfloat>
#include <algorithm>
#include <memory>

#include "CondTools/Hcal/interface/visualizeHFPhase1PMTParams.h"
#include "CondTools/Hcal/interface/parseHcalDetId.h"

#include "TCanvas.h"
#include "TPad.h"
#include "TGraph.h"
#include "TAxis.h"
#include "TH1F.h"

typedef std::vector<std::shared_ptr<TGraph> > Garbage;

//
// Return a usable root name (without spaces) for the given detector id
//
static std::string rootDetectorName(const HcalDetId& id) {
  using namespace std;
  ostringstream os;
  os << hcalSubdetectorName(id.subdet()) << '_' << id.ieta() << '_' << id.iphi() << '_' << id.depth();
  return os.str();
}

static TH1F* plotFunctors(TVirtualPad* pad,
                          const char* plotTitle,
                          const char* yAxisTitle,
                          const double cut,
                          const double ymin,
                          const double ymax,
                          const AbsHcalFunctor& f1,
                          const AbsHcalFunctor& f2,
                          const VisualizationOptions& opts,
                          Garbage& garbage,
                          const bool isReference,
                          TH1F* frame) {
  const int lineWidth = 2;
  const int refLineWidth = 4;

  assert(opts.plotPoints > 1);
  const unsigned nDraw = opts.plotPoints + 1;
  std::vector<double> xvec(nDraw);
  std::vector<double> y1(nDraw);
  std::vector<double> y2(nDraw);
  const double xrange = opts.maxCharge - cut;
  const double yrange = ymax - ymin;
  xvec[0] = cut;
  y1[0] = ymin + 0.05 * yrange;
  y2[0] = ymax - 0.05 * yrange;
  const double h = xrange / (opts.plotPoints - 1);
  for (unsigned i = 1; i <= opts.plotPoints; ++i) {
    const double x = cut + h * (i - 1);
    xvec[i] = x;
    y1[i] = f1(x);
    y2[i] = f2(x);
  }

  // Root was designed by (insert your favorite explective here),
  // so the plot frame on the pad is of type TH1F (a histogram!)
  //
  if (frame == nullptr) {
    frame = pad->DrawFrame(opts.minCharge, ymin, opts.maxCharge + 0.1 * xrange, ymax);
    frame->GetXaxis()->SetTitle("Q [fC]");
    frame->GetYaxis()->SetTitle(yAxisTitle);
    frame->SetTitle(plotTitle);
  }

  std::shared_ptr<TGraph> gr1(new TGraph(nDraw, &xvec[0], &y1[0]));
  gr1->SetLineWidth(isReference ? refLineWidth : lineWidth);
  gr1->SetLineColor(isReference ? kGreen : kBlue);
  gr1->Draw("L");
  garbage.push_back(gr1);

  std::shared_ptr<TGraph> gr2(new TGraph(nDraw, &xvec[0], &y2[0]));
  gr2->SetLineWidth(isReference ? refLineWidth : lineWidth);
  gr2->SetLineColor(isReference ? kGreen : kRed);
  gr2->Draw("L");
  garbage.push_back(gr2);

  return frame;
}

static void plotConfig(const HcalDetId& id,
                       const unsigned tableIndex,
                       const HFPhase1PMTData& cut,
                       const VisualizationOptions& opts,
                       const HFPhase1PMTData* ref) {
  using namespace std;

  const double canvasWidth = 1000;
  const double canvasHeight = 300;

  // Root was designed by idiots oblivious to smart pointers and unable
  // to carry their objects around. Because of this, most plottable
  // object in "Root" must have a unique name, even if it makes no sense
  // whatsoever to name such an object. Keep it in mind that idiots are
  // incapable of handling spaces inside the names.
  //
  const bool isDefault = tableIndex == HcalIndexLookup::InvalidIndex;
  const std::string& detName = rootDetectorName(id);
  const std::string& canvName = isDefault ? std::string("Default") : detName;
  ostringstream ostitle;
  if (isDefault)
    ostitle << "Default Cuts";
  else
    ostitle << "Cuts for " << detName;
  const std::string& canvTitle = ostitle.str();

  TCanvas* canv = new TCanvas(canvName.c_str(), canvTitle.c_str(), canvasWidth, canvasHeight);

  // Root was designed by idiots oblivious to the difference between
  // window size and canvas size. Because of this, the canvas size
  // has to be set explicitly again, despite the fact that the
  // constructor already had these arguments.
  //
  canv->SetCanvasSize(canvasWidth, canvasHeight);
  canv->Divide(3, 1);

  // Root was designed by idiots changing their minds too often.
  // Graphs are an exception from the naming scheme and ownership
  // convention. They are not managed by root, so graphs on all
  // pads must persist until the whole canvas is written out.
  // This is why we need a garbage bin -- to manage these things.
  //
  Garbage bin;

  TVirtualPad* pad = canv->cd(1);
  {
    TH1F* frame = nullptr;
    if (ref)
      frame = plotFunctors(pad,
                           "PMT Anode 0",
                           "Rise Time Cuts [ns]",
                           ref->minCharge0(),
                           opts.minTDC,
                           opts.maxTDC,
                           ref->cut(HFPhase1PMTData::T_0_MIN),
                           ref->cut(HFPhase1PMTData::T_0_MAX),
                           opts,
                           bin,
                           true,
                           frame);
    plotFunctors(pad,
                 "PMT Anode 0",
                 "Rise Time Cuts [ns]",
                 cut.minCharge0(),
                 opts.minTDC,
                 opts.maxTDC,
                 cut.cut(HFPhase1PMTData::T_0_MIN),
                 cut.cut(HFPhase1PMTData::T_0_MAX),
                 opts,
                 bin,
                 false,
                 frame);
  }
  pad->Draw();

  ostringstream midtitle;
  midtitle << "PMT Anode 1 ";
  if (isDefault)
    midtitle << "(Default Cuts)";
  else
    midtitle << '(' << detName << ", Index " << tableIndex << ')';
  const string& mtstr = midtitle.str();
  pad = canv->cd(2);
  {
    TH1F* frame = nullptr;
    if (ref)
      frame = plotFunctors(pad,
                           mtstr.c_str(),
                           "Rise Time Cuts [ns]",
                           ref->minCharge1(),
                           opts.minTDC,
                           opts.maxTDC,
                           ref->cut(HFPhase1PMTData::T_1_MIN),
                           ref->cut(HFPhase1PMTData::T_1_MAX),
                           opts,
                           bin,
                           true,
                           frame);
    plotFunctors(pad,
                 mtstr.c_str(),
                 "Rise Time Cuts [ns]",
                 cut.minCharge1(),
                 opts.minTDC,
                 opts.maxTDC,
                 cut.cut(HFPhase1PMTData::T_1_MIN),
                 cut.cut(HFPhase1PMTData::T_1_MAX),
                 opts,
                 bin,
                 false,
                 frame);
  }
  pad->Draw();

  pad = canv->cd(3);
  {
    TH1F* frame = nullptr;
    if (ref)
      frame = plotFunctors(pad,
                           "Charge Asymmetry",
                           "Asymmetry Cuts",
                           ref->minChargeAsymm(),
                           opts.minAsymm,
                           opts.maxAsymm,
                           ref->cut(HFPhase1PMTData::ASYMM_MIN),
                           ref->cut(HFPhase1PMTData::ASYMM_MAX),
                           opts,
                           bin,
                           true,
                           frame);
    plotFunctors(pad,
                 "Charge Asymmetry",
                 "Asymmetry Cuts",
                 cut.minChargeAsymm(),
                 opts.minAsymm,
                 opts.maxAsymm,
                 cut.cut(HFPhase1PMTData::ASYMM_MIN),
                 cut.cut(HFPhase1PMTData::ASYMM_MAX),
                 opts,
                 bin,
                 false,
                 frame);
  }
  pad->Draw();

  canv->Write();
}

void visualizeHFPhase1PMTParams(const std::vector<HcalDetId>& idVec,
                                const HFPhase1PMTParams& cuts,
                                const VisualizationOptions& options,
                                const HFPhase1PMTParams* reference) {
  using namespace std;

  const unsigned n = idVec.size();
  if (options.verbose) {
    cout << "Cut visualization is requested for the following PMTs:\n";
    for (unsigned i = 0; i < n; ++i)
      cout << idVec[i] << '\n';
    cout.flush();
  }

  // Plot the default cut
  const HFPhase1PMTData* defaultCut = cuts.getDefault();
  const HFPhase1PMTData* defaultRef = nullptr;
  if (reference)
    defaultRef = reference->getDefault();
  if (defaultCut)
    plotConfig(HcalDetId(), HcalIndexLookup::InvalidIndex, *defaultCut, options, defaultRef);

  // Plot all other cuts
  for (unsigned i = 0; i < n; ++i) {
    const HcalDetId& id = idVec[i];
    const unsigned tableIndex = cuts.getIndex(id);
    if (tableIndex == HcalIndexLookup::InvalidIndex) {
      if (defaultCut)
        cout << "PMT " << id << " is using default config" << endl;
      else
        cout << "ERROR! No configuration found for PMT " << id << endl;
    } else {
      cout << "PMT " << id << " is using config " << tableIndex << endl;
      const HFPhase1PMTData* cut = cuts.getByIndex(tableIndex);
      assert(cut);
      const HFPhase1PMTData* ref = nullptr;
      if (reference)
        ref = reference->getByIndex(tableIndex);
      plotConfig(id, tableIndex, *cut, options, ref);
    }
  }
}