#include "fud_assert.hpp"

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

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

namespace fud {

void assertFormat(
    const char* assertion,
    const std::source_location sourceLocation,
    Span<char, ASSERT_MSG_SIZE> buffer)
{
    auto lengthResult = cStringLength(sourceLocation.file_name());
    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 = sourceLocation.file_name() + filenameLength - MAX_LINE_CHARS;
        filenameLength = MAX_FILE_CHARS;
    }

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

[[noreturn]] void assertFail(const char* assertion, const std::source_location sourceLocation)
{
    Array<char, ASSERT_MSG_SIZE> buffer{};
    assertFormat(assertion, sourceLocation, Span<char, ASSERT_MSG_SIZE>::make(buffer));
    buffer[buffer.size() - 1] = '\0';
    fputs(buffer.data(), stderr);
    std::abort();
}

} // namespace fud