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

#ifndef tools_file
#define tools_file

#include "gzip"
#include "forit"
#include "words" //is_hippo
#include "path" //suffix
#include "S_STRING"

#include <cstdlib>
#include <cstring>

#ifdef TOOLS_MEM
#include "mem"
#endif

namespace tools {
namespace file {

inline bool exists(const std::string& a_string) {
  FILE* file = ::fopen(a_string.c_str(),"rb");
  if(!file) return false;
  ::fclose(file);
  return true;
}

inline bool write(const std::string& a_file,const std::string& a_string) {
  // a_string could contain \n separated lines.
  FILE* file = ::fopen(a_file.c_str(),"wb");
  if(!file) return false;
  if(::fprintf(file,"%s",a_string.c_str())<0) {
    ::fclose(file);
    return false;
  }
  ::fclose(file);
  return true;
}

inline bool write(const std::string& a_file,const std::vector<std::string>& a_text){
  FILE* file = ::fopen(a_file.c_str(),"wb");
  if(!file) return false;
  tools_vforcit(std::string,a_text,it) {
    if(::fprintf(file,"%s\n",(*it).c_str())<0) {
      ::fclose(file);
      return false;
    }
  }
  ::fclose(file);
  return true;
}

inline bool read_buff(FILE* a_file,char* a_buff,unsigned int a_lbuf,size_t& a_length) {
  a_length = ::fread(a_buff,1,a_lbuf,a_file);
  return true;
}

inline bool read_cstring(FILE* a_file,char* a_buff,unsigned int a_lbuf,size_t& a_length) {
  if(::fgets(a_buff,a_lbuf,a_file)==NULL) {
    a_length = 0;
    return false; //EOF
  }

  size_t l = ::strlen(a_buff);
  //  On Windows, editors when saving binary files,
  // put \r\n at place of \n ; we then look for \r\n.
  if( (l>=2) && (a_buff[l-2]=='\r') && (a_buff[l-1]=='\n') ) {
    a_buff[l-2] = '\0';
    l -= 2;
  } else if( (l>=1) && (a_buff[l-1]=='\n') ) {
    a_buff[l-1] = '\0';
    l -= 1;
  }

  a_length = l;
  return true;
}


inline bool read(const std::string& a_file,std::vector<std::string>& a_text){
  a_text.clear();
  FILE* file = ::fopen(a_file.c_str(),"rb");
  if(!file) return false;
  unsigned int BUFSIZE = 65536;
  char* buffer = new char[BUFSIZE+1];
  if(!buffer) {::fclose(file);return false;}
  while(true) {
    size_t l;
    if(!read_cstring(file,buffer,BUFSIZE,l)) break; // EOF.
    a_text.push_back(buffer);
  }
  delete [] buffer;
  ::fclose(file);
  return true;
}

inline bool read_num(const std::string& a_file,std::vector<std::string>::size_type a_num,std::vector<std::string>& a_text,const std::string& a_cmt = ""){
  a_text.clear();
  FILE* file = ::fopen(a_file.c_str(),"rb");
  if(!file) return false;
  unsigned int BUFSIZE = 65536;
  char* buffer = new char[BUFSIZE+1];
  if(!buffer) {::fclose(file);return false;}
  while(true) {
    size_t l;
    if(!read_cstring(file,buffer,BUFSIZE,l)) break; // EOF.
    if(a_cmt.size()&&(!strncmp(a_cmt.c_str(),buffer,a_cmt.size()))) continue;
    if(a_text.size()<a_num) {
      a_text.push_back(buffer);
    } else {
      break;
    }
  }
  delete [] buffer;
  ::fclose(file);
  return true;
}

inline bool read_bytes(const std::string& a_file,char*& a_buffer,long& a_length){
  // Returned buffer should be deleted with delete [].
  FILE* file = ::fopen(a_file.c_str(),"rb");
  if(!file) {
    a_buffer = 0;
    a_length = 0L;
    return false;
  }
  // Get file size :
  ::fseek(file,0L,SEEK_END);
  long filesize = ::ftell(file);
  if(!filesize) {
    ::fclose(file);
    a_buffer = new char[1];
#ifdef TOOLS_MEM
    mem::increment(s_new().c_str());
#endif
    a_length = 0L;
    return true; //empty file.
  }
  // Add one byte to be able to add \n if file contain lines.
  a_buffer = new char[filesize+1];
  if(!a_buffer) {
    ::fclose(file);
    a_buffer = 0;
    a_length = 0L;
    return false;
  }
#ifdef TOOLS_MEM
  mem::increment(s_new().c_str());
#endif
  ::rewind(file);
  size_t nitem = ::fread(a_buffer,(size_t)filesize,(size_t)1,file);
  if(nitem!=1){
    ::fclose(file);
    delete [] a_buffer;
#ifdef TOOLS_MEM
    mem::decrement(s_new().c_str());
#endif
    a_buffer = 0;
    a_length = 0L;
    return false;
  }
  ::fclose(file);
  a_buffer[filesize] = 0;
  a_length = filesize;
  return true;
}  

inline bool write_bytes(const std::string& a_file,const char* a_buffer,size_t a_length){
  FILE* file = ::fopen(a_file.c_str(),"wb");
  if(!file) return false;
  if(!a_length) {
    ::fclose(file);
    return true;
  }
  size_t nitem = ::fwrite((char*)a_buffer,a_length,(size_t)1,file);
  ::fclose(file);
  return (nitem!=1?false:true);
}  

inline bool num_csv_doubles(const std::string& a_string,char& a_sep,unsigned int& a_number){
  if(a_string.empty()) {a_sep=0;a_number=0;return true;} //it is ok.

  //guess sep :
  char sep = 0;
 {const char* buffer = a_string.c_str();
  //::printf("debug : |%s|\n",buffer);
  const char* pos = buffer;
  const char* mx = buffer+a_string.size();
  char* end;
 {double d = ::strtod(pos,&end);(void)d;}
  //::printf("debug : d first %g\n",d);
  if(end==pos) {a_sep=0;a_number=0;return false;} //not starting with a number.
  if(end==mx) {a_sep=0;a_number=1;return true;} //is ok, one number only.
  sep = *end;}

  //::printf("debug : %d\n",sep);

  unsigned int number = 0;

  const char* buffer = a_string.c_str();
  //::printf("debug : |%s|\n",buffer);
  const char* pos = buffer;
  const char* mx = buffer+a_string.size();
  while(true) {
    char* end;
   {double d = ::strtod(pos,&end);(void)d;}
    if(end==pos) {
      if(end>=mx) break;
      a_sep = sep;
      a_number = number;
      return false; //since a number expected.
    }
    //::printf("debug : d %g\n",d);
    number++;
    if(*end!=sep) {
      if(end>=mx) break;
      a_sep = sep;
      a_number = number;
      return false; //since a sep is expected.
    }
    pos = end+1;
    if(pos>mx) break;
  }
  
  a_sep = sep;
  a_number = number;
  return true;
}

// NOTE : take care of the open in exlib/app/tntnet/main_cpp which can't work by using suffix.

inline bool is_hippo(const std::string& a_file,bool& a_is){
  //if((suffix(a_file)=="hiptxt")||(suffix(a_file)=="tnt")) {
  //  a_is = true;
  //  return true;
  //}
  // An hippo file as :
  //  one line for title.
  //  one line with n labels separated by \t
  //  data lines with n numbers separated by a char sep (not necessary \t) (at least one data line expected).
  std::vector<std::string> txt;
  if(!file::read_num(a_file,3,txt)) {a_is=false;return false;}
  if(txt.size()<3) {a_is=false;return true;}
  char csep;
  unsigned int number;
  if(!num_csv_doubles(txt[2],csep,number)) {a_is=false;return true;}
  std::vector<std::string> ws;
  words(txt[1],"\t",false,ws);
  if(ws.size()!=number) {a_is=false;return true;}
  bool all_doubles = true;
  tools_vforcit(std::string,ws,it) {
    const char* pos = (*it).c_str();
    char* end;
    double d = ::strtod(pos,&end);(void)d;
    if(end==pos) {all_doubles=false;break;}
  }
  a_is = all_doubles?false:true; //all_double=false then we assume the second line is labels of columns.
  return true;  
}

// NOTE : the below is_csv() does not take into account a column with strings.

inline bool is_csv(const std::vector<std::string>& a_txt,bool& a_is){
  //a_sep = 0;
  a_is = false;
  if(a_txt.empty()) return true;

  //guess sep from first data line :
  char sep = 0;
 {const char* buffer = a_txt[0].c_str();
  //::printf("debug : |%s|\n",buffer);
  const char* pos = buffer;
  char* end;
 {double d = ::strtod(pos,&end);(void)d;}
  //::printf("debug : d first %g\n",d);
  if(end==pos) return true; //not starting with a number.
  //end==mx is ok, one column only.
  sep = *end;}

  //::printf("debug : %d\n",sep);

  unsigned int first_coln = 0;

  tools_vforcit(std::string,a_txt,it) {
    const char* buffer = (*it).c_str();
    //::printf("debug : |%s|\n",buffer);
    const char* pos = buffer;
    const char* mx = buffer+(*it).size();
    unsigned int coln = 0;
    while(true) {
      char* end;
     {double d = ::strtod(pos,&end);(void)d;}
      if(end==pos) break;
      //::printf("debug : d %g\n",d);
      if(*end!=sep) return true;
      coln++;
      pos = end+1;
      if(pos>mx) break;
    }
    //::printf("debug : coln %d\n",coln);
    if(it==a_txt.begin()) {
      first_coln = coln;
    } else {
      if(coln!=first_coln) return true;      
    }
  }
  
  //a_sep = sep;
  a_is = true;
  return true;
}

inline bool is_csv(const std::string& a_file,bool& a_is){
  // look at suffix. Some file can't be guessed.
  if(suffix(a_file)=="csv") {a_is = true;return true;}
  //try to guess :
  std::vector<std::string> txt;
  if(!file::read_num(a_file,3,txt,"#")) {a_is=false;return false;}
  return is_csv(txt,a_is);
}

inline bool is_lua(const std::string& a_file,bool& a_is){
  // look at suffix. Some file can't be guessed.
  if(suffix(a_file)=="lua") {a_is = true;return true;}
  //try to guess ?
  a_is = false;
  return true;
}

inline bool is_py(const std::string& a_file,bool& a_is){
  // look at suffix. Some file can't be guessed.
  if(suffix(a_file)=="py") {a_is = true;return true;}
  //try to guess ?
  a_is = false;
  return true;
}

}}

#include "fileis"

namespace tools {
namespace file {

inline bool mime_type(const std::string& a_file,std::string& a_mime){
  ////////////////
  // binaries :
  ////////////////
 {bool is;
  if(is_jpeg(a_file,is)&&is) {
    a_mime = "image/jpeg";
    return true;
  }}

 {bool is;
  if(is_png(a_file,is)&&is) {
    a_mime = "image/png";
    return true;
  }}

 {bool is;
  if(is_ico(a_file,is)&&is) {
    a_mime = "image/vnd.microsoft.icon";
    return true;
  }}

 {bool is;
  if(is_fits(a_file,is)&&is) {
    a_mime = "image/fits";
    return true;
  }}

 {bool is;
  if(is_gzip(a_file,is)&&is) {
    a_mime = "application/gzip";
    return true;
  }}

 {bool is;
  if(is_zip(a_file,is)&&is) {
    a_mime = "application/zip";
    return true;
  }}

 {bool is;
  if(is_root(a_file,is)&&is) {
    a_mime = "application/octet-stream";
    return true;
  }}

  ////////////////
  // text :
  ////////////////
 {bool is;
  if(is_aida(a_file,is)&&is) {
    a_mime = "text/xml";
    return true;
  }}
 {bool is;
  if(is_exsg(a_file,is)&&is) {
    a_mime = "text/xml";
    return true;
  }}
 {bool is;
  if(is_scenarios(a_file,is)&&is) {
    a_mime = "text/xml";
    return true;
  }}
 {bool is;
  if(is_slides(a_file,is)&&is) {
    a_mime = "text/xml";
    return true;
  }}
 {bool is;
  if(is_gdml(a_file,is)&&is) {
    a_mime = "text/xml";
    return true;
  }}

 {bool is;
  if(is_ps(a_file,is)&&is) {
    a_mime = "application/postscript";
    return true;
  }}

 {bool is;
  if(is_fog(a_file,is)&&is) {
    a_mime = "text/plain";
    return true;
  }}

 {bool is;
  if(is_csv(a_file,is)&&is) {
    a_mime = "text/csv";
    return true;
  }}

 {bool is;
  if(is_hippo(a_file,is)&&is) {
    a_mime = "text/plain";
    return true;
  }}

 {bool is;
  if(is_dot(a_file,is)&&is) {
    a_mime = "text/plain";
    return true;
  }}

 {bool is;
  if(is_iv(a_file,is)&&is) {
    a_mime = "application/octet-stream";
    return true;
  }}

  a_mime = "application/octet-stream";
  return false;
}

/*
inline bool copy(const std::string& a_from,const std::string& a_to){
  if(a_to==a_from) return true; //done
  std::vector<std::string> text;
  if(!file::read(a_from,text)) return false;
  return file::write(a_to,text);
}
*/

inline bool found(const std::string& a_file,const std::string& a_what,std::vector<std::string>& a_found){
  a_found.clear();
  std::vector<std::string> text;
  if(!file::read(a_file,text)) return false;
  tools_vforcit(std::string,text,it) {
    if((*it).find(a_what)!=std::string::npos) {
      a_found.push_back(*it);
    }
  }
  return true;
}

inline bool std_remove(const std::string& a_file) {
  if(a_file.empty()) return true;
  return (::remove(a_file.c_str()) ==0 ? true : false);
}

inline bool std_remove(std::vector<std::string>& a_files) {
  bool status = true;
  tools_vforit(std::string,a_files,it) {
    if(!std_remove(*it)) status = false;
  }
  a_files.clear();
  return status;
}

inline bool std_rename(const std::string& a_from,const std::string& a_to) {
  //NOTE : a_from must not be a path !
  //       Darwin is ok with a path but not Linux !
  //       For example : 
  //         ::rename("/tmp/tmp01"."x");
  //       return -1 on Linux.
  //       To do the upper then someone must use move. 
  //       But there is no move in the standard lib C !
  return (::rename(a_from.c_str(),a_to.c_str()) == 0 ? true : false);
}

inline bool copy_bytes(const std::string& a_from,const std::string& a_to) {
  if(a_to==a_from) return true;
  char* buffer;
  long length;
  if(!read_bytes(a_from,buffer,length)) return false;
  bool status = write_bytes(a_to,buffer,(size_t)length);
  delete [] buffer;
#ifdef TOOLS_MEM
  mem::decrement(s_new().c_str());
#endif
  return status;
}

/*
class holder {
public:
  TOOLS_SCLASS(tools::file::holder)
public:
  holder(const std::string& a_path):m_path(a_path){
#ifdef TOOLS_MEM
    mem::increment(s_class().c_str());
#endif
  }
  virtual ~holder() {
    std_remove(m_path);
#ifdef TOOLS_MEM
    mem::decrement(s_class().c_str());
#endif
  }
public:
  holder(const holder& a_from):m_path(a_from.m_path){
#ifdef TOOLS_MEM
    mem::increment(s_class().c_str());
#endif
  }
  holder& operator=(const holder& a_from){
    m_path = a_from.m_path;
    return *this;
  }
protected:
  std::string m_path;
};
*/

}}

#include "file_reader"

namespace tools {

class FILE_reader : public virtual file::reader {
public: //file_reader
  virtual bool open(const std::string& a_file) {
    if(m_FILE) return false;
    m_FILE = ::fopen(a_file.c_str(),"rb");
    if(!m_FILE) return false;
    return true;
  }
  virtual void close() {
    if(!m_FILE) return;
    ::fclose(m_FILE);
    m_FILE = 0;
  }
  virtual bool is_open() const {return m_FILE?true:false;}
  virtual bool read(char* a_buff,unsigned int a_lbuf,size_t& a_length) {
    a_length = ::fread(a_buff,1,a_lbuf,m_FILE);
    return true;
  }
  virtual bool get_line(char* a_buff,unsigned int a_lbuf) {
    return ::fgets(a_buff,a_lbuf,m_FILE)==NULL?false:true;
  }
  virtual bool eof() const {
#if defined(_MSC_VER) && _MSC_VER <= 1400
    return feof(m_FILE)?true:false;
#else
    return ::feof(m_FILE)?true:false;
#endif
  }
public:
  FILE_reader():m_FILE(0){}
  virtual ~FILE_reader() {if(m_FILE) ::fclose(m_FILE);}
protected:
  FILE_reader(const FILE_reader& a_from)
  :file::reader(a_from)
  ,m_FILE(0)
  {}
  FILE_reader& operator=(const FILE_reader&){return *this;}
protected:
  FILE* m_FILE;
};

}

#include "file_format" //backcomp
#include "fsize"       //backcomp

#endif