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

#ifndef tools_fmanip
#define tools_fmanip

#include "file"
#include "sep"
#include "sout"
#include <ostream>

namespace tools {

inline bool find_with_dirs(std::ostream& a_out,
                           const std::vector<std::string>& a_dirs,
                           const std::string& a_file,
                           std::string& a_path,
                           bool a_verbose = false ) {
  std::vector<std::string>::const_iterator it;
  for(it=a_dirs.begin();it!=a_dirs.end();++it) {
    if((*it).empty()) {
      // with a "" in dirs, this case could solve :
      // - a_file in the current directory.
      // - a_file with an absolute path name.
      a_path = a_file; //may be an absolute file name.
    } else {
      a_path = *it;
      a_path += sep();
      a_path += a_file;
    }

    if(a_verbose) {
      a_out << "find_with_dirs :"
            << " look for " << sout(a_path) << " ..."
            << std::endl;
    }

    if(file::exists(a_path)) {
      if(a_verbose) {
        a_out << "find_with_dirs :"
              << " found " << sout(a_path) << "."
              << std::endl;
      }
      return true;
    }
  }
  a_path.clear();

  if(a_verbose) {
    a_out << "find_with_dirs :"
          << " " << sout(a_file) << " not found."
          << std::endl;
  }

  return false;   
}

}

#include "system"

namespace tools {

inline bool find_with_env(std::ostream& a_out,
                          const std::string& a_env,
                          const std::string& a_file,
                          std::string& a_path,
                          bool a_verbose = false ) {
  std::string PATH;
  if(!get_env(a_env,PATH)) {
    //look for a a_file in current directory.
    a_path = a_file;
    if(file::exists(a_path)) return true;
    a_out << "tools::find_with_path :"
          << " env variable " << sout(a_env) << " not defined."
          << std::endl;
    a_path.clear();
    return false;
  }
  if(a_verbose) {
    a_out << "find_with_path :"
          << " PATH is " << sout(PATH)
          << std::endl;
  }

  std::vector<std::string> dirs;
  words(PATH,psep(),false,dirs); //or true ?

  return find_with_dirs(a_out,dirs,a_file,a_path,a_verbose);
}

}

#endif