#ifndef __COMMAND_LINE_HPP__
#define __COMMAND_LINE_HPP__

#include <vector>
#include <string>
#include <assert.h>
#include "optionparser/optionparser.h"
#include "optionparser/optionparser_ext.hpp"



namespace fail {
    /**
     * @class CommandLine
     * @brief Implements a command line interface, that filters the
     * simulators command line. It is a Singleton.
     */
    class CommandLine {
    public:
        typedef int argument_count;
        typedef char **argument_value;
    private:
        static CommandLine m_instance;

        std::vector<std::string> argv;
        std::vector<option::Descriptor> options;
        option::Option *parsed_options, *parsed_buffer;
    public:
        /// Handle for accessing the parsed data of an option
        typedef int option_handle;

        /**
         * Singleton accessor
         *
         * @return reference to the CommandLine singleton object
         */
        static CommandLine &Inst() { return m_instance; }

        /**
         * Called by the simulator to filter all fail arguments from
         * argc, argv
         */
        void collect_args(argument_count &, argument_value &);

        /**
         * Add a argument manually
         */
        void add_args(char *value) { argv.push_back(value); }

        /**
         * Add a option to the command line interface of the fail-client
         *
         * @param shortopt e.g "m" for -m
         * @param longopt e.g. "memory-region" for --memory-region=
         * @param check_arg argument is required.
         * @param help help text to be printed for -h
         *
         * @return return handle to option
         */
        option_handle addOption(const std::string &shortopt,
                                const std::string &longopt,
                                const option::CheckArg & check_arg,
                                const std::string &help);

        /**
         *
         * do the actual parsing, called by the experiment
         *
         * @return true on success
         */
        bool parse();

        /**
         * Accessor for the command line option objects
         *
         * @param handle option handle
         *
         * @return reference to the option parser object
         */
        option::Option &operator[](option_handle handle) {
            assert(parsed_options != 0);
            assert(handle >= 0 && handle < (int)options.size());
            return parsed_options[handle];
        }
        /**
         * Print help message.
         */
        void printUsage() {
            int columns = getenv("COLUMNS")? atoi(getenv("COLUMNS")) : 80;
            option::printUsage(fwrite, stdout, options.data(), columns);
        }
    };

} // end of namespace

#endif