#include "re/log.h"

#include <cstdarg>
#include <cstdio>
#include <mutex>

#include <windows.h>

namespace re {
namespace {

std::mutex g_mutex;
FILE* g_file = nullptr;

} // namespace

void OpenLog(const wchar_t* path) {
    std::lock_guard lock(g_mutex);
    if (!g_file) {
        g_file = _wfsopen(path, L"w", _SH_DENYWR);
    }
}

void Log(const char* fmt, ...) {
    char message[1024];
    va_list args;
    va_start(args, fmt);
    vsnprintf(message, sizeof(message), fmt, args);
    va_end(args);

    SYSTEMTIME t;
    GetLocalTime(&t);
    char line[1100];
    snprintf(line, sizeof(line), "%02d:%02d:%02d.%03d %s\n", t.wHour, t.wMinute, t.wSecond, t.wMilliseconds,
             message);

    OutputDebugStringA(line);
    std::lock_guard lock(g_mutex);
    if (g_file) {
        fputs(line, g_file);
        fflush(g_file);
    }
}

} // namespace re