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

#ifndef tools_wroot_ntuple
#define tools_wroot_ntuple

// An ntuple class to write at the ROOT format.
// It inherits wroot::tree and each column is mapped
// on a wroot::branch. Each add_row() does a tree::fill().

#include "tree"

#include "../vfind"
#include "../vmanip"

namespace tools {
namespace wroot {

class ntuple : public tree {
protected:
  class icol {
  public:
    virtual ~icol(){}
  public:
    virtual void add() = 0;
    virtual const std::string& name() const = 0;
    virtual void set_basket_size(uint32) = 0;
  };
  
public:
  template <class T>
  class column : public virtual icol {
  public: //icol
    virtual void add() {m_leaf->fill(m_tmp);m_tmp = m_def;}
    virtual const std::string& name() const {return m_leaf->name();}
    virtual void set_basket_size(uint32 a_size) {
      m_leaf->branch().set_basket_size(a_size);
    }
  public:
    column(tree& a_tree,
                  const std::string& a_name,
                  const T& a_def)
    :m_tree(a_tree),m_leaf(0)
    ,m_def(a_def),m_tmp(a_def)
    {
      branch* br = m_tree.create_branch(a_name);
      m_leaf = br->create_leaf<T>(a_name,a_name);
    }
    virtual ~column(){}
  protected:
    column(const column& a_from)
    :icol(a_from)
    ,m_tree(a_from.m_tree) 
    ,m_leaf(0)
    ,m_def(a_from.m_def)
    ,m_tmp(a_from.m_tmp)    
    {}
    column& operator=(const column& a_from){
      m_leaf = 0;
      m_def = a_from.m_def;
      m_tmp = a_from.m_tmp;
      return *this;
    }
  public:
    bool fill(const T& a_value) {m_tmp = a_value;return true;}
  protected:
    tree& m_tree;
    leaf<T>* m_leaf;
    T m_def;
    T m_tmp;
  };

public:
  ntuple(idir& a_dir,
                const std::string& a_name,const std::string& a_title)
  : tree(a_dir,a_name,a_title){}
  virtual ~ntuple() {}
protected:
  ntuple(const ntuple& a_from)
  :iobject(a_from),itree(a_from),tree(a_from)
  {}
  ntuple& operator=(const ntuple&){return *this;}
public:
  const std::vector<icol*>& columns() const {return m_cols;}

  template <class T>
  column<T>* create_column(const std::string& a_name,
                                  const T& a_def = T()) {
    if(find_named<icol>(m_cols,a_name)) return 0;
    column<T>* col = new column<T>(*this,a_name,a_def);
    if(!col) return 0;
    m_cols.push_back(col);
    return col;
  }

  bool add_row() {
    if(m_cols.empty()) return false;
   {std::vector<icol*>::iterator it;
    for(it=m_cols.begin();it!=m_cols.end();++it) (*it)->add();}
    uint32 n;
    return tree::fill(n);
  }
  void set_basket_size(uint32 a_size) {
    std::vector<icol*>::iterator it;
    for(it=m_cols.begin();it!=m_cols.end();++it) {
      (*it)->set_basket_size(a_size);
    }
  }
protected:
  std::vector<icol*> m_cols;
};

}}

#endif