// passwdgen.cpp
#include "passwdgen.h"
#include <iostream>
#include <random>

std::string random_string(std::size_t length, bool punc) {
    std::string CHARACTERS;
    std::string ALPHANUM = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    const std::string SPECIALS = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~";

    if (punc) {
        CHARACTERS = ALPHANUM.append(SPECIALS);
    } else {
        CHARACTERS = ALPHANUM;
    }

    std::random_device random_device;
    std::mt19937 generator(random_device());
    std::uniform_int_distribution<> distribution(0, static_cast<int>(CHARACTERS.size() - 1));

    std::string random_string;
    for (std::size_t i = 0; i < length; ++i) {
        random_string += CHARACTERS[distribution(generator)];
    }
    return random_string;
}

void show_usage(const std::string& name) {
    std::cerr << "Usage: " << name << " [OPTIONS] " << std::endl
              << "Options:" << std::endl
              << "\t-h, --help          \t\tShow this help message" << std::endl
              << "\t-l, --length [n]    \t\tThe length of the password (default: 32)" << std::endl
              << "\t-p, --punctuation \t\tToggle special characters (default: false)"
              << std::endl;
}