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

#ifndef tools_path
#define tools_path

#include <string>

namespace tools {

inline std::string suffix(const std::string& a_string,bool a_back = true) {
  // If a_string = dir0/dir1/dir2/dir3/name.xxx
  //   return xxx
  std::string::size_type pos = a_back?a_string.rfind('.'):a_string.find('.');
  if(pos==std::string::npos) return "";
  pos++;
  return a_string.substr(pos,a_string.size()-pos);
}

inline std::string nosuffix(const std::string& a_string,bool a_back = true){
  // If a_string = dir0/dir1/dir2/dir3/name.xxx
  //   return name
  // Start searching after the last / (or last \ for Windows).
  std::string::size_type pos = a_string.rfind('/');
  if(pos==std::string::npos) pos = a_string.rfind('\\');
  if(pos==std::string::npos) pos = 0;
  else pos++;
  std::string s = a_string.substr(pos,a_string.size()-pos);
  std::string::size_type dot_pos = a_back?s.rfind('.'):s.find('.');
  if(dot_pos==std::string::npos) return s;
  return s.substr(0,dot_pos);
}

inline std::string base_name(const std::string& a_path) {
  std::string::size_type pos_slash = a_path.rfind('/');
  std::string::size_type pos_bslash = a_path.rfind('\\');
  std::string::size_type pos = 0;
  if(pos_slash==std::string::npos) {
    if(pos_bslash==std::string::npos) {
      pos = std::string::npos;
    } else {
      pos = pos_bslash;
    }
  } else {
    if(pos_bslash==std::string::npos) {
      pos = pos_slash;
    } else {
      if(pos_slash<=pos_bslash) {
        pos = pos_bslash;
      } else {
        pos = pos_slash;
      }
    }
  }
  if(pos==std::string::npos) return a_path;
  pos++;
  return a_path.substr(pos,a_path.size()-pos);
}

inline bool is_absolute_path(const std::string& a_path) {
  if(a_path.find('\\')!=std::string::npos) { //Windows path.
    if(a_path.find(':')!=std::string::npos) return true;
    return (a_path.size()&&(a_path[0]=='\\')?true:false);
  } else { //UNIX path
    return (a_path.size()&&(a_path[0]=='/')?true:false);
  }
}

inline bool path_name_suffix(
 const std::string& a_string
,std::string& a_path
,std::string& a_name
,std::string& a_suffix
){
  // If a_string = dir0/dir1/dir2/dir3/name.xxx
  //   a_path = dir0/dir1/dir2/dir3
  //   a_name = name.xxx
  //   a_suffix = xxx
  // If a_string = dir0/name.xxx
  //   a_path = dir0
  //   a_name = name.xxx
  //   a_suffix = xxx
  // If a_string = name.xxx
  //   a_path.clear()
  //   a_name = name.xxx
  //   a_suffix = xxx
  // If a_string = /name.xxx
  //   a_path = "/"
  //   a_name = name.xxx
  //   a_suffix = xxx
  // If a_string = .
  //   a_path = "."
  //   a_name.clear()
  //   a_suffix.clear()
  // If a_string = ..
  //   a_path = ".."
  //   a_name.clear()
  //   a_suffix.clear()
  if(a_string==".") {
    a_path = ".";
    a_name.clear();
    a_suffix.clear();
    return true;
  } else if(a_string=="..") {
    a_path = "..";
    a_name.clear();
    a_suffix.clear();
    return true;
  }

  std::string::size_type pos_slash = a_string.rfind('/');
  std::string::size_type pos_bslash = a_string.rfind('\\');
  std::string::size_type pos = 0;
  if(pos_slash==std::string::npos) {
    if(pos_bslash==std::string::npos) {
      pos = std::string::npos;
    } else {
      pos = pos_bslash;
    }
  } else {
    if(pos_bslash==std::string::npos) {
      pos = pos_slash;
    } else {
      if(pos_slash<=pos_bslash) {
        pos = pos_bslash;
      } else {
        pos = pos_slash;
      }
    }
  }

  if(pos==std::string::npos) {
    a_path.clear();
    pos = 0;
  } else if(pos==0) {
    a_path = "/";
    pos++;
  } else {
    a_path = a_string.substr(0,pos);
    pos++;
  }
  std::string s = a_string.substr(pos,a_string.size()-pos);
  pos = s.rfind('.');
  if(pos==std::string::npos) {
    a_name = s;
    a_suffix.clear();
  } else {
    a_name = s;
    pos++;
    a_suffix = s.substr(pos,s.size()-pos);
  }
  return true;
}

inline std::string dir_name(const std::string& a_path,unsigned int a_num = 1){
  std::string path = a_path;
  for(unsigned int index=0;index<a_num;index++) {
    std::string p,n,s;
    path_name_suffix(path,p,n,s);
    path = p;
  }
  return path;
}

}

#endif