/*
   MIT License

  Copyright (c) 2021 Felix Biego

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/

#include "ESP32Time.h"
#include "time.h"
#include <sys/time.h>
#include "esp_attr.h"

RTC_DATA_ATTR static bool overflow;

/*!
    @brief  set the internal RTC time
    @param  epoch
            epoch time in seconds
    @param  ms
            microseconds (optional)
*/
void ESP32Time::setTime(unsigned long epoch, int ms) const {
  struct timeval tv;
  if (epoch > 2082758399){
	  overflow = true;
	  tv.tv_sec = epoch - 2082758399;  // epoch time (seconds)
  } else {
	  overflow = false;
	  tv.tv_sec = epoch;  // epoch time (seconds)
  }
  tv.tv_usec = ms;    // microseconds
  settimeofday(&tv, NULL);
}

/*!
    @brief  get the internal RTC time as a tm struct
*/
tm ESP32Time::getTimeStruct() const {
  struct tm timeinfo;
  time_t now;
  time(&now);
  localtime_r(&now, &timeinfo);
  time_t tt = mktime (&timeinfo);
    
  if (overflow) tt += 63071999;
  struct tm * tn = localtime(&tt);
  if (overflow){
	  tn->tm_year += 64;
  }
  return *tn;
}

/*!
    @brief  get the current epoch seconds as unsigned long
*/
unsigned long ESP32Time::getEpoch() const {
	struct tm timeinfo = getTimeStruct();
	return mktime(&timeinfo);
}