// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.

#ifndef tools_hbook_wntuple
#define tools_hbook_wntuple

// A class to write an HBOOK ntuple.

#include <tools/vmanip>
#include <tools/vfind>
#include <tools/srep>
#include <tools/sto>
#include <tools/scast>
#include <tools/stype>

#include "CHBOOK"

#ifdef WIN32
extern "C" int NTUC[1];
#else
extern "C" int ntuc_[1];
#endif

namespace tools {
namespace hbook {

class wntuple {

protected:
  class icol {
  public:
    virtual ~icol(){}
  public:
    virtual void* cast(const std::string&) const = 0;
    virtual const std::string& s_cls() const = 0;
  public:
    virtual const std::string& name() const = 0; //for find_named
  };
  
public:
  template <class T>
  class column : public virtual icol {
  public:
    static const std::string& s_class() {
      static const std::string s_v
        ("tools::hbook::wntuple::column<"+tools::stype(T())+">");
      return s_v;
    }
  public: //icol
    virtual void* cast(const std::string& a_class) const {
      if(void* p = tools::cmp_cast< column<T> >(this,a_class)) return p;
      else return 0;
    }
    virtual const std::string& s_cls() const {return s_class();}
    virtual const std::string& name() const {return m_name;}
  public:
    column(const std::string& a_name)
    :m_name(a_name),m_tmp(0)
    {}
    virtual ~column(){}
  protected:
    column(const column& a_from)
    :icol(a_from),m_name(a_from.m_name),m_tmp(a_from.m_tmp)
    {}
    column& operator=(const column& a_from){
      m_name = a_from.m_name;
      m_tmp = a_from.m_tmp;
      return *this;
    }
  public:
    void set_address(T* a_pos) {m_tmp = a_pos;}
    bool fill(const T& a_value) {*m_tmp = a_value;return true;}
  protected:
    std::string m_name;
    T* m_tmp;
  };
  
public:
  wntuple(int a_id,const std::string& a_title)
  :m_path(CHPWD()),m_id(a_id),m_path_file(CHPWD())
  {
    // WARNING : the below assumes that we are under //PAWC/<something>
    //           and that a //<something> exists and is attached to a file.
    tools::replace(m_path_file,"//PAWC","/");
    cd_beg();
    CHBNT(m_id,a_title," ");
    cd_end();
  }
  virtual ~wntuple(){
    cd_beg();
    CHDELET(m_id);
    cd_end();
    tools::clear<icol>(m_cols);
  }
protected:
  //Can we copy the HBOOK object ?
  wntuple(const wntuple& a_from)
  :m_path(a_from.m_path),m_id(a_from.m_id)
  {}
  wntuple& operator=(const wntuple& a_from){
    m_path = a_from.m_path;
    m_id = a_from.m_id;
    return *this;
  }
public:
  template <class T>
  column<T>* create_column(const std::string& a_name) {
    if(tools::find_named<icol>(m_cols,a_name)) return 0;

    std::string block("blk"); //8 chars max.
    block += tools::to<unsigned int>(m_cols.size());
    if(block.size()>8) return 0;

    column<T>* col = new column<T>(a_name);

#ifdef WIN32
    int nvar = NTUC[0];
    char* pos = ((char*)NTUC)+8+8*nvar;
    NTUC[0]++;
#else
    int nvar = ntuc_[0];
    char* pos = ((char*)ntuc_)+8+8*nvar;
    ntuc_[0]++;
#endif

    col->set_address((T*)pos);

    cd_beg();
    CHBNAME(m_id,block,pos,a_name+":"+h_type(T()));
    cd_end();

    m_cols.push_back(col);

    return col;
  }

  bool add_row() {
    cd_beg();
    CHFNT(m_id);
    cd_end();
    return true;
  }

  // optimization :
  void add_row_beg() const {cd_beg();}
  bool add_row_fast() {CHFNT(m_id);return true;}
  void add_row_end() const {cd_end();}


  template <class T>
  column<T>* find_column(const std::string& a_name) {
    icol* col = tools::find_named<icol>(m_cols,a_name);
    if(!col) return 0;
    return tools::cast<icol, column<T> >(*col);
  }

  //std::string title() const {
  //  std::string title;
  //  int ncx,ncy;
  //  rarg xmin,xmax,ymin,ymax;
  //  cd_beg();
  //  CHGIVE(m_id,title,ncx,xmin,xmax,ncy,ymin,ymax);
  //  cd_end();
  //  return title;
  //}

  const std::vector<icol*>& columns() const {return m_cols;}

protected:
  static const std::string& h_type(int) {
    static const std::string s_v("I*4");
    return s_v;
  }
  static const std::string& h_type(float) {
    static const std::string s_v("R*4");
    return s_v;
  }
  static const std::string& h_type(double) {
    static const std::string s_v("R*8");
    return s_v;
  }

protected:
  void cd_beg() const{
    wntuple& self = const_cast<wntuple&>(*this);
    CHPWDF(self.m_tmp);
    CHCDIR(m_path," ");
    CHCDIR(m_path_file," "); // cd on file.
  }
  void cd_end() const {CHCDIR(m_tmp," ");}
protected:
  std::string m_path;
  int m_id;
  std::string m_path_file;
  char m_tmp[1024];
  std::vector<icol*> m_cols;
};

}}

#endif