/* -*- mode: C++; indent-tabs-mode: nil; -*-

 *

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

 *

 * Copyright (C) 2003-2010

 * 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::_terminate(ArgParserException::Reason reason) const

  {

    if(_exit_on_problems)

      exit(1);

    else throw(ArgParserException(reason));

  }

  void ArgParser::_showHelp(void *p)

  {

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

    (static_cast<ArgParser*>(p))->_terminate(ArgParserException::HELP);

  }

  ArgParser::ArgParser(int argc, const char * const *argv)

    :_argc(argc), _argv(argv), _command_name(argv[0]),

    _exit_on_problems(true) {

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

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

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

  }

  ArgParser::~ArgParser()

  {

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

      if(i->second.self_delete)

        switch(i->second.type) {

        case BOOL:

          delete i->second.bool_p;

          break;

        case STRING:

          delete i->second.string_p;

          break;

        case DOUBLE:

          delete i->second.double_p;

          break;

        case INTEGER:

          delete i->second.int_p;

          break;

        case UNKNOWN:

          break;

        case FUNC:

          break;

        }

  }

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

                               const std::string &help,

                               int value, bool obl)

  {

    ParData p;

    p.int_p=new int(value);

    p.self_delete=true;

    p.help=help;

    p.type=INTEGER;

    p.mandatory=obl;

    _opts[name]=p;

    return *this;

  }

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

                               const std::string &help,

                               double value, bool obl)

  {

    ParData p;

    p.double_p=new double(value);

    p.self_delete=true;

    p.help=help;

    p.type=DOUBLE;

    p.mandatory=obl;

    _opts[name]=p;

    return *this;

  }

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

                               const std::string &help,

                               bool value, bool obl)

  {

    ParData p;

    p.bool_p=new bool(value);

    p.self_delete=true;

    p.help=help;

    p.type=BOOL;

    p.mandatory=obl;

    _opts[name]=p;

    return *this;

  }

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

                               const std::string &help,

                               std::string value, bool obl)

  {

    ParData p;

    p.string_p=new std::string(value);

    p.self_delete=true;

    p.help=help;

    p.type=STRING;

    p.mandatory=obl;

    _opts[name]=p;

    return *this;

  }

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

                               const std::string &help,

                               int &ref, bool obl)

  {

    ParData p;

    p.int_p=&ref;

    p.self_delete=false;

    p.help=help;

    p.type=INTEGER;

    p.mandatory=obl;

    _opts[name]=p;

    return *this;

  }

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

                                  const std::string &help,

                                  double &ref, bool obl)

  {

    ParData p;

    p.double_p=&ref;

    p.self_delete=false;

    p.help=help;

    p.type=DOUBLE;

    p.mandatory=obl;

    _opts[name]=p;

    return *this;

  }

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

                                  const std::string &help,

                                  bool &ref, bool obl)

  {

    ParData p;

    p.bool_p=&ref;

    p.self_delete=false;

    p.help=help;

    p.type=BOOL;

    p.mandatory=obl;

    _opts[name]=p;

    ref = false;

    return *this;

  }

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

                               const std::string &help,

                               std::string &ref, bool obl)

  {

    ParData p;

    p.string_p=&ref;

    p.self_delete=false;

    p.help=help;

    p.type=STRING;

    p.mandatory=obl;

    _opts[name]=p;

    return *this;

  }

  ArgParser &ArgParser::funcOption(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.self_delete=false;

    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);

    LEMON_ASSERT(i!=_opts.end(), "Unknown option: '"+opt+"'");

    LEMON_ASSERT(!(i->second.ingroup),

                 "Option already in option group: '"+opt+"'");

    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);

    LEMON_ASSERT(o!=_opts.end(), "Unknown option: '"+opt+"'");

    LEMON_ASSERT(_opts.find(syn)==_opts.end(),

                 "Option already used: '"+syn+"'");

    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::const_iterator i) const

  {

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

    if(i->second.has_syn)

      for(Opts::const_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::const_iterator i) const

  {

    GroupData::Opts::const_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::const_iterator i) const

  {

    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>::const_iterator i)

    const

  {

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

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

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

  }

  void ArgParser::shortHelp() const

  {

    const unsigned int LINE_LEN=77;

    const std::string indent("    ");

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

    int pos=_command_name.size()+2;

    for(Groups::const_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::const_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>::const_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() const

  {

    shortHelp();

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

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

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

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

    _terminate(ArgParserException::HELP);

  }

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

  {

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

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

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

    _terminate(ArgParserException::UNKNOWN_OPT);

  }

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

  {

    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() const

  {

    bool ok=true;

    for(Opts::const_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::const_iterator i=_groups.begin();i!=_groups.end();++i)

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

        {

          int set=0;

          for(GroupData::Opts::const_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::const_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::const_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";

      _terminate(ArgParserException::INVALID_OPT);

    }

  }

  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;

  }

}