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/// \file utils/cmdline/parser.hpp
/// Routines and data types to parse command line options and arguments.

#if !defined(UTILS_CMDLINE_PARSER_HPP)
#define UTILS_CMDLINE_PARSER_HPP

#include <map>
#include <string>
#include <vector>

namespace utils {
namespace cmdline {


class base_option;


/// Replacement for argc and argv to represent a command line.
///
/// TODO(jmmv): This type should be somewhere else.  base_command.hpp should not
/// be including this file to just get this type.
typedef std::vector< std::string > args_vector;


/// Collection of options to be used during parsing.
///
/// TODO(jmmv): This type should be somewhere else.  base_command.hpp should not
/// be including this file to just get this type.
typedef std::vector< const base_option* > options_vector;


/// Representation of a parsed command line.
///
/// This class is returned by the command line parsing algorithm and provides
/// methods to query the values of the options and the value of the arguments.
/// All the values fed into this class can considered to be sane (i.e. the
/// arguments to the options and the arguments to the command are valid), as all
/// validation happens during parsing (before this class is instantiated).
class parsed_cmdline {
    /// Mapping of option names to all the values provided.
    std::map< std::string, std::vector< std::string > > _option_values;

    /// Collection of arguments with all options removed.
    args_vector _arguments;

    const std::vector< std::string >& get_option_raw(const std::string&) const;

public:
    parsed_cmdline(const std::map< std::string, std::vector< std::string > >&,
                   const args_vector&);

    bool has_option(const std::string&) const;

    template< typename Option >
    typename Option::option_type get_option(const std::string&) const;

    template< typename Option >
    std::vector< typename Option::option_type > get_multi_option(
        const std::string&) const;

    const args_vector& arguments(void) const;
};


parsed_cmdline parse(const args_vector&, const options_vector&);
parsed_cmdline parse(const int, const char* const*, const options_vector&);


}  // namespace cmdline
}  // namespace utils

#endif  // !defined(UTILS_CMDLINE_PARSER_HPP)