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#include <utils/time.hpp>
#include <ctime>
#include <sstream>
#include <iomanip>
#include <locale>
#include "biboumi.h"
namespace utils
{
std::string to_string(const std::time_t& timestamp)
{
constexpr std::size_t stamp_size = 21;
char date_buf[stamp_size];
if (std::strftime(date_buf, stamp_size, "%FT%TZ", std::gmtime(×tamp)) != stamp_size - 1)
return "";
return {std::begin(date_buf), std::end(date_buf) - 1};
}
std::time_t parse_datetime(const std::string& stamp)
{
static const char* format = "%Y-%m-%dT%H:%M:%S";
std::tm t = {};
#ifdef HAS_GET_TIME
std::istringstream ss(stamp);
ss.imbue(std::locale("C"));
std::string remainings;
ss >> std::get_time(&t, format) >> remainings;
if (ss.fail())
return -1;
#else
/* Y - m - d T H : M : S */
constexpr std::size_t stamp_size_without_tz = 4 + 1 + 2 + 1 + 2 + 1 + 2 + 1 + 2 + 1 + 2;
if (!strptime(stamp.data(), format, &t)) {
return -1;
}
const std::string remainings(stamp.data() + stamp_size_without_tz);
#endif
if (remainings.empty())
return -1;
std::string timezone;
// Skip optional fractions of seconds
if (remainings[0] == '.')
{
const auto pos = remainings.find_first_not_of(".0123456789");
timezone = remainings.substr(pos);
}
else
timezone = std::move(remainings);
if (timezone.compare(0, 1, "Z") != 0)
{
std::stringstream tz_ss;
tz_ss << timezone;
int multiplier = -1;
char prefix;
int hours;
char sep;
int minutes;
tz_ss >> prefix >> hours >> sep >> minutes;
if (tz_ss.fail())
return -1;
if (prefix == '-')
multiplier = +1;
else if (prefix != '+')
return -1;
t.tm_hour += multiplier * hours;
t.tm_min += multiplier * minutes;
}
return ::timegm(&t);
}
}