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// File: DDTIDRingAlgo.cc
// Description: Position n copies of detectors in alternate positions and
//              also associated ICC's 
// Em 17Sep07: Cool inserts moved to DDTIDModulePosAlgo.h 

#include <cmath>
#include <algorithm>

#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "DetectorDescription/Base/interface/DDutils.h"
#include "DetectorDescription/Core/interface/DDCurrentNamespace.h"
#include "DetectorDescription/Core/interface/DDSplit.h"
#include "Geometry/TrackerCommonData/interface/DDTIDRingAlgo.h"
#include "CLHEP/Units/GlobalPhysicalConstants.h"
#include "CLHEP/Units/GlobalSystemOfUnits.h"


DDTIDRingAlgo::DDTIDRingAlgo() {
  LogDebug("TIDGeom") << "DDTIDRingAlgo info: Creating an instance";
}

DDTIDRingAlgo::~DDTIDRingAlgo() {}

void DDTIDRingAlgo::initialize(const DDNumericArguments & nArgs,
                               const DDVectorArguments & vArgs,
                               const DDMapArguments & ,
                               const DDStringArguments & sArgs,
                               const DDStringVectorArguments & vsArgs) {

  idNameSpace        = DDCurrentNamespace::ns();
  moduleName         = vsArgs["ModuleName"]; 
  iccName            = sArgs["ICCName"]; 
  DDName parentName = parent().name();
  LogDebug("TIDGeom") << "DDTIDRingAlgo debug: Parent " << parentName 
                      << "\tModule " << moduleName[0] << ", "
                      << moduleName[1] << "\tICC " << iccName 
                      << "\tNameSpace " << idNameSpace;

  number            = int (nArgs["Number"]);
  startAngle        = nArgs["StartAngle"];
  rModule           = nArgs["ModuleR"];
  zModule           = vArgs["ModuleZ"];
  rICC              = nArgs["ICCR"];
  sICC              = nArgs["ICCShift"];
  zICC              = vArgs["ICCZ"];

  LogDebug("TIDGeom") <<"DDTIDRingAlgo debug: Parameters for positioning--"
                      << " StartAngle " << startAngle/CLHEP::deg
                      << " Copy Numbers " << number << " Modules at R " 
                      << rModule << " Z " << zModule[0] << ", " << zModule[1] 
                      << " ICCs at R " << rICC << " Z " << zICC[0] << ", " 
                      << zICC[1]; 
}

void DDTIDRingAlgo::execute(DDCompactView& cpv) {

  double theta = 90.*CLHEP::deg;
  double phiy  = 0.*CLHEP::deg;
  double dphi  = CLHEP::twopi/number;

  DDName mother = parent().name();
  DDName module;
  DDName icc(DDSplit(iccName).first, DDSplit(iccName).second);

  //Loop over modules
  for (int i=0; i<number; i++) {

    //First the module
    double phiz = startAngle + i*dphi;
    double xpos = rModule*cos(phiz);
    double ypos = rModule*sin(phiz);
    double zpos, thetay, phix;
    if (i%2 == 0) {
      phix   = phiz + 90.*CLHEP::deg;
      thetay = 0*CLHEP::deg;
      zpos   = zModule[0];
      module = DDName(DDSplit(moduleName[0]).first, 
                      DDSplit(moduleName[0]).second);
    } else {
      phix   = phiz - 90.*CLHEP::deg;
      thetay = 180*CLHEP::deg;
      zpos   = zModule[1];
      module = DDName(DDSplit(moduleName[1]).first, 
                      DDSplit(moduleName[1]).second);
    }
    
    // stereo face inside toward structure, rphi face outside
    phix   = phix   - 180.*CLHEP::deg;
    thetay = thetay + 180.*CLHEP::deg;
    //
    
    DDTranslation trmod(xpos, ypos, zpos);
    double phideg = phiz/CLHEP::deg;
    DDRotation rotation;
    std::string rotstr = mother.name() + dbl_to_string(phideg*10.);
    rotation = DDRotation(DDName(rotstr, idNameSpace));
    if (!rotation) {
      LogDebug("TIDGeom") << "DDTIDRingAlgo test: Creating a new rotation "
                          << rotstr << "\t" << theta/CLHEP::deg << ", " 
                          << phix/CLHEP::deg << ", " << thetay/CLHEP::deg 
                          << ", " << phiy/CLHEP::deg << ", "
                          << theta/CLHEP::deg << ", " << phiz/CLHEP::deg;
      rotation = DDrot(DDName(rotstr, idNameSpace), theta, phix, thetay, phiy,
                       theta, phiz);
    }
  
   cpv.position(module, mother, i+1, trmod, rotation);
    LogDebug("TIDGeom") << "DDTIDRingAlgo test: " << module << " number "
                        << i+1 << " positioned in " << mother << " at "
                        << trmod << " with " << rotation;

    //Now the ICC
    if (i%2 == 0 ) {
      zpos = zICC[0];
      xpos = rICC*cos(phiz) + sICC*sin(phiz);
      ypos = rICC*sin(phiz) - sICC*cos(phiz);
    } else {
      zpos = zICC[1];
      xpos = rICC*cos(phiz) - sICC*sin(phiz);
      ypos = rICC*sin(phiz) + sICC*cos(phiz);
    }
    DDTranslation tricc(xpos, ypos, zpos);
   cpv.position(icc, mother, i+1, tricc, rotation);
    LogDebug("TIDGeom") << "DDTIDRingAlgo test: " << icc << " number " 
                        << i+1 << " positioned in " << mother << " at "
                        << tricc << " with " << rotation;

  }
}