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

#ifndef tools_waxml_ntuple
#define tools_waxml_ntuple

// A ntuple class to write at the aida tuple format.
// Each add_row() write a row at the aida tuple format.

#include "../vfind"
#include "../vmanip"
#include "../sout"
#include "../tos"

#include <ostream>

// for sub_ntuple :
#include "../scast"
#include <sstream>

namespace tools {
namespace waxml {

class ntuple {
protected:
  static cid _cid(int)    {return 1;}
  static cid _cid(float)  {return 2;}
  static cid _cid(double) {return 3;}

  class iobj {
  public:
    virtual ~iobj(){}
  public:
    virtual void* cast(cid) const = 0;
    virtual const std::string& name() const = 0;
    virtual std::string aida_type() const = 0;
  };

  class leaf : public virtual iobj {
  public:
    static cid id_class() {return 100;}
  public: //iobj
    virtual void* cast(cid a_class) const {
      if(void* p = cmp_cast<leaf>(this,a_class)) {return p;}
      return 0;
    }
  public:
    virtual std::string s_def() const = 0;
    virtual std::string s_value() const = 0;
  public:
    leaf(){}
    virtual ~leaf(){}
    leaf(const leaf& a_from):iobj(a_from){}
    leaf& operator=(const leaf&){return *this;}
  };
  
  static const std::string& s_aida_type(int) {
    static const std::string s_v("int");
    return s_v;
  }
  static const std::string& s_aida_type(float) {
    static const std::string s_v("float");
    return s_v;
  }
  static const std::string& s_aida_type(double) {
    static const std::string s_v("double");
    return s_v;
  }

public:
  template <class T>
  class column : public leaf {
  public:
    static cid id_class() {return 200+_cid(T());}
  public: //iobj
    virtual void* cast(cid a_class) const {
      if(void* p = cmp_cast< column<T> >(this,a_class)) {return p;}
      return leaf::cast(a_class);
    }
    virtual const std::string& name() const {return m_name;}
    virtual std::string aida_type() const {return s_aida_type(T());}
  public: //leaf
    virtual std::string s_def() const {return tos(m_def);}
    virtual std::string s_value() const {return tos(m_tmp);}
  public:
    column(const std::string& a_name,const T& a_def)
    :m_name(a_name),m_def(a_def),m_tmp(a_def)
    {}
    virtual ~column(){}
  protected:
    column(const column& a_from)
    :leaf(a_from)
    ,m_name(a_from.m_name) 
    ,m_def(a_from.m_def)
    ,m_tmp(a_from.m_tmp)
    {}
    column& operator=(const column& a_from){
      m_name = a_from.m_name;
      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:
    std::string m_name;
    T m_def;
    T m_tmp;
  };


  class sub_ntuple : public virtual iobj {
  public:
    static cid id_class() {return 300;}
  public: //iobj
    virtual void* cast(cid a_class) const {
      if(void* p = cmp_cast<sub_ntuple>(this,a_class)) {return p;}
      return 0;
    }
    virtual const std::string& name() const {return m_name;}
    virtual std::string aida_type() const {return "ITuple";}
  public:
    sub_ntuple(const std::string& a_name,
                      const std::string& a_spaces)
    :m_name(a_name),m_spaces(a_spaces){}
    virtual ~sub_ntuple(){}
  protected:
    sub_ntuple(const sub_ntuple& a_from)
    :iobj(a_from),m_name(a_from.m_name){}
    sub_ntuple& operator=(const sub_ntuple&){return *this;}
  public:
    template <class T>
    column<T>* create_column(const std::string& a_name,
                                    const T& a_def = T()) {
      if(find_named<iobj>(m_cols,a_name)) return 0;
      column<T>* col = new column<T>(a_name,a_def);
      if(!col) return 0;
      m_cols.push_back(col);
      return col;
    }

    sub_ntuple* create_sub_ntuple(const std::string& a_name){
      if(find_named<iobj>(m_cols,a_name)) return 0;
      std::string spaces;
      for(unsigned int i=0;i<4;i++) spaces += " ";
      sub_ntuple* col = new sub_ntuple(a_name,m_spaces+spaces);
      if(!col) return 0;
      m_cols.push_back(col);
      return col;
    }


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

    std::string booking() const {
      std::string s;
      get_booking(m_cols,s);
      return s;
    }
    void reset() {m_tmp.clear();}
    const std::string& value() const {return m_tmp;}

    bool add_row() {
      if(m_cols.empty()) return false;
      std::ostringstream sout;
      sout << m_spaces << "<row>" << std::endl;
      std::vector<iobj*>::const_iterator it;
      for(it=m_cols.begin();it!=m_cols.end();++it) {
        if(sub_ntuple* sub = id_cast<iobj,sub_ntuple>(*(*it))) {
          sout << m_spaces << "  <entryITuple>" << std::endl;
          sout << sub->value();
          sout << m_spaces << "  </entryITuple>" << std::endl;
          sub->reset();
        } else if(leaf* lf = id_cast<iobj,leaf>(*(*it))){
          sout << m_spaces << "  <entry" 
               << " value=\"" << lf->s_value().c_str()
               << "\"/>" << std::endl;
        }
      }
      sout << m_spaces << "</row>" << std::endl;

      m_tmp += sout.str();

      return true;
    }
  protected:
    std::string m_name;
    std::string m_spaces;
    std::vector<iobj*> m_cols;
    std::string m_tmp;
  };

public:
  ntuple(std::ostream& a_writer,
                unsigned int a_spaces = 0)
  :m_writer(a_writer){
    for(unsigned int i=0;i<a_spaces;i++) m_spaces += " ";
  }
  virtual ~ntuple() {
    tools::clear<iobj>(m_cols);
  }
protected:
  ntuple(const ntuple& a_from)
  :m_writer(a_from.m_writer)
  ,m_spaces(a_from.m_spaces)
  {}
  ntuple& operator=(const ntuple& a_from){
    m_spaces = a_from.m_spaces;
    return *this;
  }
public:
  const std::vector<iobj*>& 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<iobj>(m_cols,a_name)) return 0;
    column<T>* col = new column<T>(a_name,a_def);
    if(!col) return 0;
    m_cols.push_back(col);
    return col;
  }

  sub_ntuple* create_sub_ntuple(const std::string& a_name){
    if(find_named<iobj>(m_cols,a_name)) return 0;
    std::string spaces;
    for(unsigned int i=0;i<10;i++) spaces += " ";
    sub_ntuple* col = new sub_ntuple(a_name,m_spaces+spaces);
    if(!col) return 0;
    m_cols.push_back(col);
    return col;
  }

  void write_header(const std::string& a_path,
                           const std::string& a_name,
                           const std::string& a_title){

    // <tuple> :
    m_writer << m_spaces << "  <tuple"
             << " path=" << sout(a_path)
             << " name=" << sout(a_name)
             << " title=" << sout(a_title)
             << ">" << std::endl;

    // <columns> :
    m_writer << m_spaces << "    <columns>" << std::endl;

    std::vector<iobj*>::iterator it;
    for(it=m_cols.begin();it!=m_cols.end();++it) {
      if(sub_ntuple* sub = id_cast<iobj,sub_ntuple>(*(*it))){
        m_writer << m_spaces << "      <column"
                 << " name=" << sout((*it)->name()) 
                 << " type=" << sout("ITuple")
                 << " booking=" << sout(sub->booking())
                 << "/>" << std::endl;
      } else if(leaf* lf = id_cast<iobj,leaf>(*(*it))){
        m_writer << m_spaces << "      <column"
                 << " name=" << sout((*it)->name()) 
                 << " type=" << sout((*it)->aida_type())
                 << " default=" << sout(lf->s_def())
                 << "/>" << std::endl;
      }
    }

    m_writer << m_spaces << "    </columns>" << std::endl;
  
    // rows :
    m_writer << m_spaces << "    <rows>" << std::endl;
  }

  bool add_row() {
    if(m_cols.empty()) return false;
    m_writer << m_spaces << "      <row>" << std::endl;
    std::vector<iobj*>::const_iterator it;
    for(it=m_cols.begin();it!=m_cols.end();++it) {
      if(sub_ntuple* sub = id_cast<iobj,sub_ntuple>(*(*it))){
        m_writer << m_spaces << "        <entryITuple>" << std::endl;
        m_writer << sub->value();
        m_writer << m_spaces << "        </entryITuple>" << std::endl;
        sub->reset();
      } else if(leaf* lf = id_cast<iobj,leaf>(*(*it))){
        m_writer << m_spaces << "        <entry" 
                 << " value=" << sout(lf->s_value())
                 << "/>" << std::endl;
      }
    }
    m_writer << m_spaces << "      </row>" << std::endl;
    return true;
  }

  void write_trailer() {
    m_writer << m_spaces << "    </rows>" << std::endl;
    m_writer << m_spaces << "  </tuple>" << std::endl;
  }

protected:
  static void get_booking(const std::vector<iobj*>& a_cols,
                                 std::string& a_string) {
    a_string += "{"; //we need the + because of the tuple in tuple.

    std::vector<iobj*>::const_iterator it;
    for(it=a_cols.begin();it!=a_cols.end();++it) {
      if(it!=a_cols.begin()) a_string += ",";

      std::string type = (*it)->aida_type();
      a_string += type + " ";
      std::string name = (*it)->name();
      a_string += name + " = ";

      if(sub_ntuple* sub = id_cast<iobj,sub_ntuple>(*(*it))){
        get_booking(sub->columns(),a_string);
      } else if(leaf* lf = id_cast<iobj,leaf>(*(*it))){
        a_string += lf->s_def();
      }  
    }  
    a_string += "}";
  }

protected:
  std::ostream& m_writer;
  std::string m_path;
  std::string m_name;
  std::string m_title;
  std::string m_spaces;
  std::vector<iobj*> m_cols;
};

}}

#endif