#pragma once
#include <algorithm>
#include <string_view>
#include <cstddef>

namespace kpn {

template<std::size_t N>
struct fixed_string {
    char data[N]{};

    constexpr fixed_string(const char (&s)[N]) { std::copy_n(s, N, data); }
    constexpr bool operator==(const fixed_string&) const = default;

    template<std::size_t M>
    constexpr bool operator==(const fixed_string<M>&) const { return false; }
    constexpr std::string_view view() const { return {data, N - 1}; }
};

template<std::size_t N>
fixed_string(const char (&)[N]) -> fixed_string<N>;

// ── Port name pack lookup ─────────────────────────────────────────────────────

inline constexpr std::size_t npos = std::size_t(-1);

template<fixed_string Name, fixed_string... Names>
constexpr std::size_t index_of() {
    std::size_t i = 0;
    bool found = false;
    auto check = [&](auto n) {
        if (!found) {
            if (Name == n) found = true;
            else           ++i;
        }
    };
    (check(Names), ...);
    return found ? i : npos;
}

// ── in<> / out<> name tag structs ─────────────────────────────────────────────

template<fixed_string... Names> struct in  {};
template<fixed_string... Names> struct out {};

} // namespace kpn