#include <RTClib.h>
#include <time.h>
#include <ESP8266WiFi.h>
#include "config.h"
#include "rtc_time.h"

static RTC_DS3231 rtc;

bool rtcBegin()      { return rtc.begin(); }
bool rtcLostPower()  { return rtc.lostPower(); }

RtcTime rtcNow() {
  DateTime n = rtc.now();
  return RtcTime{ n.year(), n.month(), n.day(), n.hour(), n.minute(), n.second() };
}

void rtcSet(const RtcTime& t) {
  rtc.adjust(DateTime(t.year, t.month, t.day, t.hour, t.minute, t.second));
}

uint32_t rtcEpoch() {
  return rtc.now().unixtime();
}

bool ntpSync(int tzOffsetMin) {
  // NTP servers by IP to bypass DNS (this network doesn't resolve names reliably).
  // Cloudflare (162.159.200.123) and Google (216.239.35.0/.4) are stable anycast.
  configTime(tzOffsetMin * 60, 0, "162.159.200.123", "216.239.35.0", "216.239.35.4");
  time_t now = time(nullptr);
  int tries = 0;
  while (now < 1700000000 && tries < 120) {        // up to ~30 s
    delay(250);
    now = time(nullptr);
    tries++;
  }
  if (now < 1700000000) return false;
  struct tm* lt = localtime(&now);
  rtcSet(RtcTime{ (uint16_t)(lt->tm_year + 1900), (uint8_t)(lt->tm_mon + 1),
                  (uint8_t)lt->tm_mday, (uint8_t)lt->tm_hour,
                  (uint8_t)lt->tm_min, (uint8_t)lt->tm_sec });
  return true;
}