#ifndef TAPE_CONFIG_H
#define TAPE_CONFIG_H

#include "tapelib/filetape.h"
#include <cstddef>
#include <string>

// stringizing opearator to convert macro into string literal
#define xstr(s) str(s)
#define str(s) #s

const static std::string HELP_MSG =
    "Usage: ftsort [OPTIONS...] INPUT_FILE OUTPUT_FILE\n"
    "Sorts a Tape provided by the INPUT_FILE into the OUTPUT_FILE\n\n"
    "Options:\n"
    "-w, --write-delay VALUE\t\t\t"
    "Sets the delay of write operations to VALUE milliseconds\n"
    "-r, --read-delay VALUE\t\t\t"
    "Sets the delay of read operations to VALUE milliseconds\n"
    "-f, --seek-forward-delay VALUE\t\t"
    "Sets the delay of seeking forward operations to VALUE milliseconds\n"
    "-b, --seek-backwards-delay VALUE\t"
    "Sets the delay of seeking backwards operations to VALUE milliseconds\n"
    "-m, --memory-limit VALUE\t\t"
    "Sets the amount of cells that the program can store in its memory during "
    "sorting to VALUE\n"
    "-c, --config-file FILE\t\t\t"
    "Applies options from the FILE, config shoud be a simple KEY=VALUE list\n"
    "-v, --version\t\t\t\t"
    "Print out version of the program\n"
    "-h, --help\t\t\t\t"
    "Print help message\n\n"
    "Exmaple of valid input Tape file with values 1, 1234 and 2222222222:\n\n"
    "0000000001\n"
    "0000001234\n"
    "2222222222\n\n"
    "Example of a valid config file:\n\n"
    "write-delay=100\n"
    "read-delay=100\n"
    "seek-forward-delay=100\n"
    "seek-backwards-delay=100\n"
    "memory-limit=1024\n";

const static std::string VERSION_MSG = "ftsort ver. " xstr(VERSION);

struct AppSettings {
    std::string config_file_path;
    std::string input_file_name;
    std::string output_file_name;
    size_t memory_limit;
    bool version;
    bool help;
    tape::FileTapeSettings ft_settings;
};

/**
 * Parses command line arguments (from main) and creates an instance of
 * AppSettings from them
 *
 * @param argc Args count from main
 * @param argv Args array from main
 * @return Instance of AppSettings filled with values from command line
 */
AppSettings parse_command_line(int argc, char **argv);

/**
 * Accepts AppSettings prefilled with settings from command line, tries to open
 * the file specified in the config_file_path field and reads values from the
 * supplied config files into provided AppSettings, overwriting the settings.
 *
 * @param settings AppSettings, values of which will be overwritten by configs
 * values
 * @return true, if config file was opened and read successfully, otherwise
 * false
 */
bool read_settings_from_file(AppSettings &settings);

#endif // !TAPE_CONFIG_H