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

#ifndef tools_hbook_wfile
#define tools_hbook_wfile

#include <sstream>
#include <ostream>

#include "CHBOOK"
#include <tools/srep>
#include <tools/sout>

#ifdef WIN32
extern "C" void __stdcall OCLOSE(int*);
#else
extern "C" void oclose_(int*);
#endif

namespace tools {
namespace hbook {

class wfile {
public:
  wfile(std::ostream& a_out,const std::string& a_file,
               unsigned int a_unit = 1,bool a_verbose = false)
  :m_out(a_out)
  ,m_verbose(a_verbose)
  ,m_file_name(a_file)
  ,m_is_valid(false)
  ,m_unit(0)
  {
    std::string opts("NQ");
    // maximum number of records
    get_quest()[9] = 65000;
    int record_size = 1024;

    m_dir = "LUN";
   {std::ostringstream strm;
    strm << a_unit;
    m_dir += strm.str();}

    //FIXME : we should check if m_dir already exists.
  
    int ier = CHROPEN(a_unit,m_dir,m_file_name,opts,record_size);
    if(ier) {
      m_out << "tools::hbook::wfile :"
            << " error on hropen, code " << ier 
            << std::endl;
      return;
    }

    if(get_quest()[0]) {
      m_out << "tools::hbook::wfile :"
            << " error, cannot open file " << a_file
            << std::endl;
      return;
    } 

    if(m_verbose) {
      m_out << "tools::hbook::wfile :"
            << " file " << a_file << " opened."
            << std::endl;
    }

    CHCDIR("//PAWC"," ");
    if(CHEDIR(m_dir,true)) CHDDIR(m_dir);
    CHMDIR(m_dir," ");
 
    CHCDIR("//PAWC/"+m_dir," ");

    m_unit = a_unit;
    m_is_valid = true;
  }
  virtual ~wfile() {
    if(m_verbose) {
      m_out << "tools::hbook::wfile::~wfile : cleanup..." << std::endl;
    }

    //rootFolder().clear();
  
    if(m_is_valid) {

      //CHDELET(0);
      if(m_verbose) {
        m_out << "tools::hbook::wfile::~wfile : hrend..." << std::endl;
      }
      CHREND(m_dir);
#ifdef WIN32
      OCLOSE(&m_unit);
#else
      oclose_(&m_unit);
#endif
      m_unit = 0;

      CHCDIR("//PAWC"," ");
      if(CHEDIR(m_dir,true)) CHDDIR(m_dir);

    }  

    if(m_verbose) {
      m_out << "tools::hbook::wfile::~wfile : end." << std::endl;
    }
  }
private:
  wfile(const wfile& a_from):m_out(a_from.m_out){}
  wfile& operator=(const wfile&){return *this;}
public:
  const std::string& store_name() const {return m_file_name;}
  bool is_valid() const {return m_is_valid;}
  bool write() {
    if(!m_is_valid) return false;

    std::string pwd = CHPWD();

    CHCDIR("//PAWC/"+m_dir," ");
    CHCDIR("//"+m_dir," ");
    CHROUT(0,0,"T");

    //CHLDIR("//PAWC/"+m_dir,"T");
    //CHLDIR("//"+m_dir,"T");

    CHCDIR(pwd," ");

    return true;
  }
  bool close() {
    if(!m_is_valid) return true; //done or not opened.
    CHREND(m_dir);
#ifdef WIN32
    OCLOSE(&m_unit);
#else
    oclose_(&m_unit);
#endif
    m_unit = 0;
    m_is_valid = false;
    return true;
  }

  bool cd_home(){
    if(!m_is_valid) return false;
    CHCDIR("//PAWC/"+m_dir," ");
    return true;
  }
  bool cd_up(){
    if(!m_is_valid) return false;

    std::string pwd = CHPWD();  // pwd should be //PAWC/LUN<unit>/<something>
    if(pwd.substr(0,10)!="//PAWC/LUN") {
      m_out << "tools::hbook::wfile::cd_up :"
            << " current directory " << tools::sout(pwd)
            << " is not under //PAWC/LUN."
            << std::endl;
      return false;
    }

    // look if not under //PAWC/LUN<unit> :
   {std::string s = pwd;
    tools::replace(s,"//PAWC/LUN",""); 
    if(s.find('/')==std::string::npos) return true;} //Can't cd. But it is ok.

    CHCDIR("\\"," "); //cd up under //PAWC/LUN<unit>/<something>
    std::string pwd2 = CHPWD();

    std::string s = pwd;
    tools::replace(s,"//PAWC","/"); 
    // s should be //LUN<unit>/<something>

    CHCDIR(s," ");
    CHCDIR("\\"," "); //cd up under //LUN<unit>/<something>

    CHCDIR(pwd2," ");

    return true;
  }

  bool mkdir(const std::string& a_name){
    // create a directory under
    //   //LUN<unit>/<something>
    // and 
    //   //PAWC/LUN<unit>/<something>

    if(!m_is_valid) return false;

    // a_name should not be a path.
    if(a_name.find('/')!=std::string::npos) {
      m_out << "tools::hbook::wfile::mkdir :"
            << " " << tools::sout(a_name) << " should not be a path."
            << std::endl;
      return false;
    }

    if(a_name.find('.')!=std::string::npos) {
      m_out << "tools::hbook::wfile::mkdir :"
            << " " << tools::sout(a_name) << " should not be a path."
            << std::endl;
      return false;
    }

    if(a_name.empty()) return true;

    std::string pwd = CHPWD();  // pwd should be //PAWC/LUN<unit>/<something>
    if(pwd.substr(0,10)!="//PAWC/LUN") {
      m_out << "tools::hbook::wfile::mkdir :"
            << " current directory " << tools::sout(pwd)
            << " is not under //PAWC/LUN."
            << std::endl;
      return false;
    }

    if(CHEDIR(a_name,true)) {
      //we assume that a_name is also here under //LUN<unit>/<something>
      return true;
    }

    CHMDIR(a_name," ");

    std::string s = pwd;
    tools::replace(s,"//PAWC","/"); 
    // s should be //LUN<unit>/<something>

    CHCDIR(s," ");
    CHMDIR(a_name," ");

    CHCDIR(pwd," ");

    return true;
  }
  bool mkcd(const std::string& a_name){
    if(!mkdir(a_name)) return false;
    CHCDIR(a_name," ");
    return true;
  }
  bool cd(const std::string& a_name){
    CHCDIR(a_name," ");
    return true;
  }

private:
  std::ostream& m_out;
  bool m_verbose;
  std::string m_file_name;
  bool m_is_valid;
  std::string m_dir;
  int m_unit;
};

}}

#endif

// NOTE :
//   For doing RZ write : 
//   - A //LUN<unit> has to be open.
//   - We create a //PAWC/LUN<unit> under //PAWC.
//   - The hierarchy is done in //PAWC/LUN<unit> and histos 
//     are booked here. (A HBOOK1 books anyway in a directory under //PAWC).
//   - The //PAWC/LUN<unit> structure has to be duplicated under //LUN<unit>.
//   - Then a global CHROUT(0,0,"T") can be done after doing :
//        CHCDIR("//PAWC/LUN<unit>"," ")
//        CHCDIR("//LUN<unit>"," ")

//exlib_build_use inlib