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

#ifndef tools_wroot_tree
#define tools_wroot_tree

#include "itree"
#include "iobject"

#include "branch"

namespace tools {
namespace wroot {

class tree : public virtual iobject, public virtual itree {
#ifdef TOOLS_MEM
  static const std::string& s_class() {
    static const std::string s_v("tools::wroot::tree");
    return s_v;
  }
#endif
public: //iobject
  virtual const std::string& name() const {return m_name;}
  virtual const std::string& title() const {return m_title;}
  virtual const std::string& store_class_name() const {
    static const std::string s_v("TTree");
    return s_v;
  }
  virtual bool stream(buffer& a_buffer) const {
    unsigned int c;
    if(!a_buffer.write_version(5,c)) return false;

    if(!Named_stream(a_buffer,m_name,m_title)) return false;

    // Beurk.
    if(!AttLine_stream(a_buffer)) return false;
    if(!AttFill_stream(a_buffer)) return false;
    if(!AttMarker_stream(a_buffer)) return false;

    double fEntries = (double)m_entries;
    if(!a_buffer.write(fEntries)) return false;

    double fTotBytes = (double)m_tot_bytes;
    double fZipBytes = (double)m_zip_bytes;
    if(!a_buffer.write(fTotBytes)) return false;
    if(!a_buffer.write(fZipBytes)) return false;
    if(!a_buffer.write((double)0)) return false; //fSavedBytes
    if(!a_buffer.write((int)0)) return false;    //fTimerInterval
    if(!a_buffer.write((int)25)) return false;   //fScanField (25)
    if(!a_buffer.write((int)0)) return false;    //fUpdate
    if(!a_buffer.write((int)1000000000)) return false; //fMaxEntryLoop
    int fMaxVirtualSize = 0;
    int fAutoSave = 100000000;
    if(!a_buffer.write(fMaxVirtualSize)) return false;
    if(!a_buffer.write(fAutoSave)) return false;
    if(!a_buffer.write((int)1000000)) return false;    //fEstimate;

    if(!m_branches.stream(a_buffer)) return false;

   {ObjArray<base_leaf> m_leaves;
    tools_vforcit(branch*,m_branches,itb) {
      const std::vector<base_leaf*>& leaves = (*itb)->leaves();
      tools_vforcit(base_leaf*,leaves,itl) {
        m_leaves.push_back(*itl); //WARNING : ownership touchy.
      }
    }
    if(!m_leaves.stream(a_buffer)) return false;
    m_leaves.clear();} //WARNING : important.

    // fIndexValues (TArrayD).
    if(!a_buffer.write_array(std::vector<double>())) return false; //TArrayD
    // fIndex (TArrayI).
    if(!a_buffer.write_array(std::vector<int>())) return false; //TArrayI

    if(!a_buffer.set_byte_count(c)) return false;
    return true;
  }    
public: //itree
  virtual void add_tot_bytes(uint32 a_n) {m_tot_bytes += a_n;}
  virtual void add_zip_bytes(uint32 a_n) {m_zip_bytes += a_n;}
  virtual idir& dir() {return m_dir;}
  virtual const idir& dir() const {return m_dir;}
public:
  tree(idir& a_dir, //for branch/baskets(which are keys)
              const std::string& a_name,
              const std::string& a_title)
  :m_dir(a_dir)
  ,m_out(a_dir.file().out())
  ,m_name(a_name)
  ,m_title(a_title)
  ,m_entries(0)
  ,m_tot_bytes(0)
  ,m_zip_bytes(0)
  {
#ifdef TOOLS_MEM
    mem::increment(s_class().c_str());
#endif
    a_dir.append_object(this); //a_dir takes ownership of tree.
  }
  virtual ~tree(){
#ifdef TOOLS_MEM
    mem::decrement(s_class().c_str());
#endif
  }
protected:
  tree(const tree& a_from)
  : iobject(a_from),itree(a_from)
  ,m_dir(a_from.m_dir)
  ,m_out(a_from.m_out)
  {}
  tree& operator=(const tree&){return *this;}
public:
  //const std::vector<branch*>& branches() const {return m_branches;}

  branch* create_branch(const std::string& a_name){
    branch* br = new branch(*this,a_name,m_name);
    m_branches.push_back(br);
    return br;
  }

  bool fill(uint32& a_nbytes) {
    // Fill all branches of a Tree :
    //   This function loops on all the branches of this tree.
    //   For each branch, it copies to the branch buffer (basket) the current
    //   values of the leaves data types.
    //   If a leaf is a simple data type, a simple conversion to a machine
    //   independent format has to be done.
    a_nbytes = 0;
    tools_vforcit(branch*,m_branches,it) {
      //FIXME if ((*it)->testBit(kDoNotProcess)) continue;
      uint32 n;
      if(!(*it)->fill(n)) {a_nbytes = 0;return false;}
      a_nbytes += n;
    } 

    m_entries++;

    //if (fTotBytes - fSavedBytes > fAutoSave) {
    //  if(!autoSave()) return false;
    //}

    return true;
  }

protected:
  idir& m_dir;
  std::ostream& m_out;
  //Named
  std::string m_name;
  std::string m_title;

  ObjArray<branch> m_branches;
  uint64 m_entries;   // Number of entries
  uint64 m_tot_bytes; // Total number of bytes in branches before compression
  uint64 m_zip_bytes; // Total number of bytes in branches after compression
};

}}

#endif