/******************************************************************************
 * This program illustrates conversion of numbers to different bases.
 * 
 * Copyright © 2020 Richard Lesh.  All rights reserved.
 *****************************************************************************/

#undef NDEBUG

#include "Utils.hpp"
#include <clocale>
#include <codecvt>
#include <fmt/format.h>
#include <fmt/xchar.h>
#include <iostream>
#include <string>
#include <vector>

std::locale utf8loc(std::locale(), new std::codecvt_utf8<wchar_t>);
using namespace Utils;
using namespace std;

static const vector<wstring> SYMBOLS = {L"0", L"1", L"2", L"3", L"4", L"5", L"6", L"7", L"8", L"9", L"A", L"B", L"C", L"D", L"E", L"F"};

wstring convert_to_base(int i, int base) noexcept {
    wstring result = L"";
    if (i == 0) {
        return L"0";
    }
    int x = i;
    while (x > 0) {
        int const DIGIT = x % base;
        result = SYMBOLS[DIGIT] + result;
        x = x / base;
    }
    return result;
}

static int const SUBSCRIPT0 = 0x2080;

wstring compose_subscript(int base) noexcept {
    wstring result = L"";
    int x = base;
    while (x > 0) {
        result = wstring(1, wchar_t(SUBSCRIPT0 + (x % 10))) + result;
        x = x / 10;
    }
    return result;
}

int main(int argc, char **argv) {
    setlocale(LC_ALL, "en_US.UTF-8");
    wcout.imbue(utf8loc);
    wcin.imbue(utf8loc);

    if (argc != 3) {
        wcout << fmt::format(L"Syntax: {0:s} max base", Utils::UTF8_to_wstring(argv[0])) << endl;
        exit(1);
    }
    int const MAX = Utils::stoiWithDefault(Utils::UTF8_to_wstring(argv[1]), 64);
    int const BASE = Utils::stoiWithDefault(Utils::UTF8_to_wstring(argv[2]), 16);

    for (int i = 0; i <= MAX; ++i) {
        wcout << fmt::format(L"{0:d} = {2:s}{1:s}", i, compose_subscript(BASE), convert_to_base(i, BASE)) << endl;
    }
    return 0;
}