#include "log.hpp"

#include <share.h>
#include <windows.h>

#include <cstdio>
#include <filesystem>
#include <mutex>

namespace t5de::log {

namespace {

std::FILE* open()
{
    wchar_t temp[MAX_PATH + 1];
    const DWORD length = GetTempPathW(MAX_PATH + 1, temp);
    if (length == 0 || length > MAX_PATH) {
        return nullptr;
    }
    // Shared, so it can be read while the client runs.
    return _wfsopen((std::filesystem::path(temp) / L"t5de-renderer.log").c_str(), L"w", _SH_DENYNO);
}

} // namespace

void write(std::string_view line)
{
    static std::mutex mutex;
    static std::FILE* file = open();
    const std::scoped_lock lock(mutex);
    if (file != nullptr) {
        std::fwrite(line.data(), 1, line.size(), file);
        std::fputc('\n', file);
        std::fflush(file);
    }
}

} // namespace t5de::log