#include "rdp_worker/common/time.hpp"

#include <ctime>
#include <iomanip>
#include <sstream>
#include <stdexcept>

namespace rdp_worker::common {

Clock::time_point NowUtc() {
    return Clock::now();
}

std::string ToRfc3339(Clock::time_point time_point) {
    const std::time_t raw = Clock::to_time_t(time_point);
    std::tm utc_tm{};
#if defined(_WIN32)
    gmtime_s(&utc_tm, &raw);
#else
    gmtime_r(&raw, &utc_tm);
#endif
    std::ostringstream output;
    output << std::put_time(&utc_tm, "%Y-%m-%dT%H:%M:%SZ");
    return output.str();
}

Clock::time_point ParseRfc3339(const std::string& value) {
    std::tm utc_tm{};
    std::istringstream input(value);
    input >> std::get_time(&utc_tm, "%Y-%m-%dT%H:%M:%SZ");
    if (input.fail()) {
        throw std::runtime_error("failed to parse RFC3339 timestamp: " + value);
    }
#if defined(_WIN32)
    const std::time_t raw = _mkgmtime(&utc_tm);
#else
    const std::time_t raw = timegm(&utc_tm);
#endif
    return Clock::from_time_t(raw);
}

}  // namespace rdp_worker::common