/* -*- C++ -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library

  *

  * Copyright (C) 2003-2007

  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, EGRES).

  *

  * Permission to use, modify and distribute this software is granted

  * provided that this copyright notice appears in all copies. For

  * precise terms see the accompanying LICENSE file.

  *

  * This software is provided "AS IS" with no warranty of any kind,

  * express or implied, and with no claim as to its suitability for any

  * purpose.

  *

  */

 #include <lemon/arg_parser.h>

 namespace lemon {

   void ArgParser::_showHelp(void *p)

   {

     (static_cast<ArgParser*>(p))->showHelp();

     exit(1);

   }

   ArgParser::ArgParser(int argc, char **argv) :_argc(argc), _argv(argv),

 					       _command_name(argv[0]) {

     option("-help","Print a short help message",_showHelp,this);

     synonym("help","-help");

     synonym("h","-help");

   }

   ArgParser &ArgParser::option(const std::string &name,

 			       const std::string &help,

 			       int &value, bool obl)

   {

     ParData p;

     p.int_p=&value;

     p.help=help;

     p.type=INTEGER;

     p.mandatory=obl;

     _opts[name]=p;

     return *this;

   }

   ArgParser &ArgParser::option(const std::string &name,

 			       const std::string &help,

 			       double &value, bool obl)

   {

     ParData p;

     p.double_p=&value;

     p.help=help;

     p.type=DOUBLE;

     p.mandatory=obl;

     _opts[name]=p;

     return *this;

   }

   ArgParser &ArgParser::option(const std::string &name,

 			       const std::string &help,

 			       bool &value, bool obl)

   {

     ParData p;

     p.bool_p=&value;

     p.help=help;

     p.type=BOOL;

     p.mandatory=obl;

     _opts[name]=p;

     value = false;

     return *this;

   }

   ArgParser &ArgParser::option(const std::string &name,

 			       const std::string &help,

 			       std::string &value, bool obl)

   {

     ParData p;

     p.string_p=&value;

     p.help=help;

     p.type=STRING;

     p.mandatory=obl;

     _opts[name]=p;

     return *this;

   }

   ArgParser &ArgParser::option(const std::string &name,

 			       const std::string &help,

 			       void (*func)(void *),void *data)

   {

     ParData p;

     p.func_p.p=func;

     p.func_p.data=data;

     p.help=help;

     p.type=FUNC;

     p.mandatory=false;

     _opts[name]=p;

     return *this;

   }

   ArgParser &ArgParser::optionGroup(const std::string &group,

 				    const std::string &opt)

   {

     Opts::iterator i = _opts.find(opt);

     if(i==_opts.end()) exit(3); ///\todo throw exception instead

     else if(i->second.ingroup) exit(3); ///\todo throw exception instead

     else {

       GroupData &g=_groups[group];

       g.opts.push_back(opt);

       i->second.ingroup=true;

     }

     return *this;

   }

   ArgParser &ArgParser::onlyOneGroup(const std::string &group)

   {

     GroupData &g=_groups[group];

     g.only_one=true;

     return *this;

   }

   ArgParser &ArgParser::synonym(const std::string &syn,

 				const std::string &opt)

   {

     Opts::iterator o = _opts.find(opt);

     Opts::iterator s = _opts.find(syn);

     if(o==_opts.end()||s!=_opts.end())

       exit(3); ///\todo throw exception instead

     else {

       ParData p;

       p.help=opt;

       p.mandatory=false;

       p.syn=true;

       _opts[syn]=p;

       o->second.has_syn=true;

     }

     return *this;

   }

   ArgParser &ArgParser::mandatoryGroup(const std::string &group)

   {

     GroupData &g=_groups[group];

     g.mandatory=true;

     return *this;

   }

   ArgParser &ArgParser::other(const std::string &name,

 			      const std::string &help)

   {

     _others_help.push_back(OtherArg(name,help));

     return *this;

   }

   void ArgParser::show(std::ostream &os,Opts::iterator i)

   {

     os << "-" << i->first;

     if(i->second.has_syn)

       for(Opts::iterator j=_opts.begin();j!=_opts.end();++j)

 	if(j->second.syn&&j->second.help==i->first)

 	  os << "|-" << j->first;

     switch(i->second.type) {

     case STRING:

       os << " str";

       break;

     case INTEGER:

       os << " int";

       break;

     case DOUBLE:

       os << " num";

       break;

     default:

       break;

     }

   }

   void ArgParser::show(std::ostream &os,Groups::iterator i)

   {

     GroupData::Opts::iterator o=i->second.opts.begin();

     while(o!=i->second.opts.end()) {

       show(os,_opts.find(*o));

       ++o;

       if(o!=i->second.opts.end()) os<<'|';

     }

   }

   void ArgParser::showHelp(Opts::iterator i)

   {

     if(i->second.help.size()==0||i->second.syn) return;

     std::cerr << "  ";

     show(std::cerr,i);

     std::cerr << std::endl;

     std::cerr << "     " << i->second.help << std::endl;

   }

   void ArgParser::showHelp(std::vector<ArgParser::OtherArg>::iterator i)

   {

     if(i->help.size()==0) return;

     std::cerr << "  " << i->name << std::endl

 	      << "     " << i->help << std::endl;

   }

   void ArgParser::shortHelp()

   {

     const unsigned int LINE_LEN=77;

     const std::string indent("    ");

     std::cerr << "Usage:\n  " << _command_name;

     int pos=_command_name.size()+2;

     for(Groups::iterator g=_groups.begin();g!=_groups.end();++g) {

       std::ostringstream cstr;

       cstr << ' ';

       if(!g->second.mandatory) cstr << '[';

       show(cstr,g);

       if(!g->second.mandatory) cstr << ']';

       if(pos+cstr.str().size()>LINE_LEN) {

 	std::cerr << std::endl << indent;

 	pos=indent.size();

       }

       std::cerr << cstr.str();

       pos+=cstr.str().size();

     }

     for(Opts::iterator i=_opts.begin();i!=_opts.end();++i)

       if(!i->second.ingroup&&!i->second.syn) {

 	std::ostringstream cstr;

 	cstr << ' ';

 	if(!i->second.mandatory) cstr << '[';

 	show(cstr,i);

 	if(!i->second.mandatory) cstr << ']';

 	if(pos+cstr.str().size()>LINE_LEN) {

 	  std::cerr << std::endl << indent;

 	  pos=indent.size();

 	}

 	std::cerr << cstr.str();

 	pos+=cstr.str().size();

       }

     for(std::vector<OtherArg>::iterator i=_others_help.begin();

 	i!=_others_help.end();++i)

       {

 	std::ostringstream cstr;

 	cstr << ' ' << i->name;

 	if(pos+cstr.str().size()>LINE_LEN) {

 	  std::cerr << std::endl << indent;

 	  pos=indent.size();

 	}

 	std::cerr << cstr.str();

 	pos+=cstr.str().size();

       }

     std::cerr << std::endl;

   }

   void ArgParser::showHelp()

   {

     shortHelp();

     std::cerr << "Where:\n";

     for(std::vector<OtherArg>::iterator i=_others_help.begin();

 	i!=_others_help.end();++i) showHelp(i);

     for(Opts::iterator i=_opts.begin();i!=_opts.end();++i) showHelp(i);

     exit(1);

   }

   void ArgParser::unknownOpt(std::string arg) 

   {

     std::cerr << "\nUnknown option: " << arg << "\n";

     std::cerr << "\nType '" << _command_name <<

       " --help' to obtain a short summary on the usage.\n\n";

     exit(1);

   }

   void ArgParser::requiresValue(std::string arg, OptType t) 

   {

     std::cerr << "Argument '" << arg << "' requires a";

     switch(t) {

     case STRING:

       std::cerr << " string";

       break;

     case INTEGER:

       std::cerr << "n integer";

       break;

     case DOUBLE:

       std::cerr << " floating point";

       break;

     default:

       break;

     }

     std::cerr << " value\n\n";

     showHelp();

   }

   void ArgParser::checkMandatories()

   {

     bool ok=true;

     for(Opts::iterator i=_opts.begin();i!=_opts.end();++i)

       if(i->second.mandatory&&!i->second.set) 

 	{

 	  if(ok)

 	    std::cerr << _command_name 

 		      << ": The following mandatory arguments are missing.\n";

 	  ok=false;

 	  showHelp(i);

 	}

     for(Groups::iterator i=_groups.begin();i!=_groups.end();++i)

       if(i->second.mandatory||i->second.only_one)

 	{

 	  int set=0;

 	  for(GroupData::Opts::iterator o=i->second.opts.begin();

 	      o!=i->second.opts.end();++o)

 	    if(_opts.find(*o)->second.set) ++set;

 	  if(i->second.mandatory&&!set) {

 	    std::cerr << _command_name 

 		      << ": At least one of the following arguments is mandatory.\n";

 	    ok=false;

 	    for(GroupData::Opts::iterator o=i->second.opts.begin();

 		o!=i->second.opts.end();++o)

 	      showHelp(_opts.find(*o));

 	  }

 	  if(i->second.only_one&&set>1) {

 	    std::cerr << _command_name 

 		      << ": At most one of the following arguments can be given.\n";

 	    ok=false;

 	    for(GroupData::Opts::iterator o=i->second.opts.begin();

 		o!=i->second.opts.end();++o)

 	      showHelp(_opts.find(*o));

 	  }

 	}

     if(!ok) {

       std::cerr << "\nType '" << _command_name <<

 	" --help' to obtain a short summary on the usage.\n\n";

       exit(1);

     }

   }

   ArgParser &ArgParser::parse()

   {

     for(int ar=1; ar<_argc; ++ar) {

       std::string arg(_argv[ar]);

       if (arg[0] != '-' || arg.size() == 1) {

 	_file_args.push_back(arg);

       }

       else {

 	Opts::iterator i = _opts.find(arg.substr(1));

 	if(i==_opts.end()) unknownOpt(arg);

 	else {

 	  if(i->second.syn) i=_opts.find(i->second.help);

 	  ParData &p(i->second);

 	  if (p.type==BOOL) *p.bool_p=true;

 	  else if (p.type==FUNC) p.func_p.p(p.func_p.data);

 	  else if(++ar==_argc) requiresValue(arg, p.type);

 	  else {

 	    std::string val(_argv[ar]);

 	    std::istringstream vals(val);

 	    switch(p.type) {

 	    case STRING:

 	      *p.string_p=val;

 	      break;

 	    case INTEGER:

 	      vals >> *p.int_p;

 	      break;

 	    case DOUBLE:

 	      vals >> *p.double_p;

 	      break;

 	    default:

 	      break;

 	    }

 	    if(p.type!=STRING&&(!vals||!vals.eof()))

 	      requiresValue(arg, p.type);

 	  }

 	  p.set = true;

 	}

       }

     }

     checkMandatories();

     return *this;

   }  

 }