//---------------------------------------------------------------------------//
//  1100101 |_ mov #0, r4         __                                         //
//     11   |_ <0xb380 %5c4>     / _|_ _____ ___                             //
//     0110 |_ 3.50 -> 3.60     |  _\ \ / _ (_-<                             //
//          |_ base# + offset   |_| /_\_\___/__/                             //
//---------------------------------------------------------------------------//
// fxos/util/format: printf()-style format for std::string
//
// This header provides the format() function which is essentially sprintf()
// returning std::string and converting std::string arguments to char *.
//---

#ifndef FXOS_UTIL_FORMAT_H
#define FXOS_UTIL_FORMAT_H

#include <memory>
#include <iostream>
#include <string>
#include <memory>
#include <cstdio>

/* Format a string with printf() syntax */
template<typename... Args>
std::string _format_do(std::string const &format, Args &&...args)
{
    /* Reserve space for snprintf() to put its NUL */
    size_t size = snprintf(nullptr, 0, format.c_str(), args...) + 1;

    std::unique_ptr<char[]> buf(new char[size]);
    snprintf(buf.get(), size, format.c_str(), args...);

    /* Remove the NUL from the string */
    return std::string(buf.get(), buf.get() + size - 1);
}

/* Convert std::string to char * when printing (by @Zitrax on Github) */
template<typename T>
auto _format_convert(T &&t)
{
    if constexpr(std::is_same<std::remove_cv_t<std::remove_reference_t<T>>,
                     std::string>::value)
        return std::forward<T>(t).c_str();
    else
        return std::forward<T>(t);
}

/* String formatting with std::string support in %s */
template<typename... Args>
std::string format(std::string const &format, Args &&...args)
{
    return _format_do(format, _format_convert(std::forward<Args>(args))...);
}

#endif /* FXOS_UTIL_FORMAT_H */