/* -*- 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;

  }  

}