#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
#include <vector>
#include <set>
#include <map>

#include "JLang/JEquationParameters.hh"
#include "JLang/JEquation.hh"
#include "JLang/JToken.hh"
#include "JSupport/JMeta.hh"

#include "Jeep/JComment.hh"
#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"

/**
 * \file
 *
 * General purpose program to edit or create properties file.
 * \author mdejong
 */
int main(int argc, char **argv)
{
  using namespace std;
  using namespace JPP;

  typedef JToken<';'>  token_type;

  string              inputFile;
  string              outputFile;
  vector<token_type>  modifier;
  set<string>         rm;
  int                 width;
  bool                squash;
  int                 debug;

  try {
 
    JParser<> zap("General purpose program to edit or create properties file.");
    
    zap['f'] = make_field(inputFile)   = "";
    zap['o'] = make_field(outputFile)  = "";
    zap['@'] = make_field(modifier,    "modifier; syntax \"<key> = <value>[" << token_type::SEPARATOR << "..]\"")  =  JPARSER::initialised();
    zap['r'] = make_field(rm,          "remove key")                                                               =  JPARSER::initialised();
    zap['w'] = make_field(width,       "format width of key")                                                      =  12;
    zap['q'] = make_field(squash,      "squash meta data");
    zap['d'] = make_field(debug,       "debug level")                                                              = 2;

    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }


  JComment             comment;
  map<string, string>  data;

  const JEquationFacet facet(JEquationParameters("=", ";\n", "", "#"));

  // input

  if (inputFile != "") {

    ifstream in(inputFile.c_str());

    in >> comment;
  
    in.imbue(locale(in.getloc(), facet.clone()));

    for (JEquation equation; in >> equation; ) {
      data[equation.getKey()] = equation.getValue();
    }

    in.close();
  }

  if (squash) {
    comment.clear();
  }

  comment.add(JMeta(argc, argv));

  // edit or create
  
  if (!modifier.empty()) {

    istringstream is;

    is.imbue(locale(is.getloc(), facet.clone()));

    for (const token_type& token : modifier) {

      is.clear();
      is.str(token);

      JEquation equation;

      if (is >> equation && facet.isSeparator(equation.getSeparator()))
	data[equation.getKey()] = equation.getValue();
      else
	ERROR("Invalid modifier: " << token << endl);
    }
  }

  if (!rm.empty()) {

    for (const string& key : rm) {

      map<string, string>::iterator i = data.find(key);

      if (i != data.end()) {
	data.erase(i);
      }
    }
  }

  // output

  filebuf buffer;

  if (outputFile != "") {
    buffer.open(outputFile.c_str(), ios::out);
  }

  ostream os(buffer.is_open() ? &buffer : cout.rdbuf());

  os << comment;

  os.imbue(locale(cout.getloc(), facet.clone()));

  for (const auto& item : data) {
    os << setw(width) << left << item.first << right << facet.getDefaultWhiteSpace() 
       << facet.getSeparator()                       << facet.getDefaultWhiteSpace() 
       << item.second                                << facet.getEndOfLine();
  }

  buffer.close();
}