#include "fud_assert.hpp"

#include "fud_array.hpp"
#include "fud_string_view.hpp"

#include <climits>
#include <cstdio>
#include <format>
#include <stdexcept>

namespace fud {

void assertFail(const char* assertion, const char* file, unsigned int line, const char* function) noexcept(false)
{
    constexpr size_t MAX_FILE_CHARS = 256;
    constexpr size_t MAX_FUNCTION_CHARS = 256;
    constexpr size_t BITS_PER_OCTAL = 3;
    constexpr auto MAX_LINE_CHARS = BITS_PER_OCTAL * sizeof(decltype(line)) + 3;
    constexpr size_t MAX_ASSERT_CHARS = 512 - MAX_LINE_CHARS;
    constexpr size_t ASSERT_MSG_SIZE = MAX_FILE_CHARS + MAX_LINE_CHARS + MAX_FUNCTION_CHARS + MAX_ASSERT_CHARS;

    auto lengthResult = cStringLength(file);
    size_t filenameLength = 0;
    auto badLength = lengthResult < 1 || lengthResult > SSIZE_MAX;
    if (!badLength) {
        filenameLength = static_cast<size_t>(lengthResult);
    }
    const char* filename = nullptr;
    if (badLength) {
        constexpr const char invalidFile[] = "INVALID FILE";
        static_assert(sizeof(invalidFile) < MAX_FILE_CHARS);
        filenameLength = sizeof(invalidFile);
        filename = invalidFile;
    } else if (filenameLength > MAX_LINE_CHARS) {
        filename = file + filenameLength - MAX_LINE_CHARS;
        filenameLength = MAX_FILE_CHARS;
    }

    Array<char, ASSERT_MSG_SIZE> buffer{};
    // clang-format off
    static_cast<void>(std::format_to_n(
        buffer.data(), buffer.size() - 1U,
        "{:.{}s}:{}: {:.{}s}: Assertion `{:.{}s}` failed",
        filename, filenameLength,
        line,
        function, MAX_FUNCTION_CHARS,
        assertion, MAX_ASSERT_CHARS));
    // clang-format on

    throw std::runtime_error(buffer.data());
}

} // namespace fud