#include <WiFi.h>
#include "time.h"
#include <Wire.h>         // for I2C with RTC module
#include "RTClib.h"       //to show time

RTC_DS1307 RTC;

const char* ssid = "Wokwi-GUEST";
const char* password = "";
int hou, minu, sec, wkday, yea = 0;
byte d, wk;
byte mont;

const char* ntpServer = "hu.pool.ntp.org";
const long  gmtOffset_sec = 3600;
const int   daylightOffset_sec = 3600;
int count = 0;

uint32_t autorestart_debounce_counter = 20;
uint8_t timeSyncNeeded = 1;
uint32_t timeSyncFailedDebounceCounter = 0;
uint8_t timeValidFlag = 0;




unsigned long getTime(void)
{
  time_t now;
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    //Serial.println("Failed to obtain time");
    return(0);
  }
  time(&now);

  return now;
}
void setTimezone(String timezone)
{
  Serial.printf("  Setting Timezone to %s\n",timezone.c_str());
  setenv("TZ",timezone.c_str(),1);  //  Now adjust the TZ.  Clock settings are adjusted to show the new local time
  tzset();
}
void printLocalTime()
{
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    Serial.println("Failed to obtain time");
    while (1);
  }
  Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
  hou = timeinfo.tm_hour;
  minu = timeinfo.tm_min;
  sec = timeinfo.tm_sec;
  d = timeinfo.tm_mday;
  mont = timeinfo.tm_mon + 1;
  yea = timeinfo.tm_year + 1900;

}
void SyncTime_NTPtoESP(void)
{
  configTime(3600, 3600, "hu.pool.ntp.org");
  setTimezone("CET-1CEST,M3.5.0,M10.5.0/3");
}
void SyncTime_ESPtoDS1307(void)
{
  DS1307_RTC.adjust(getTime());
}
void SyncTime_DS1307toESP(void)
{
  ESP32Time rtc(0);
  DateTime now = DS1307_RTC.now();  //Get DS1307 time
  rtc.setTime(now.unixtime());
}
void ConnectLastWifi(void)
{
  Serial.print("Connecting to ");
  Serial.print(ssid);
  WiFi.begin(ssid, password);
  
  for (size_t i = 0; i < 5; i++)
  {
    if(WiFi.status() != WL_CONNECTED)
    {
      Serial.print(".");
      //AutoRestartHandler();
      delay(500);
    }
  }
  
  

  //AutoRestartTimerReset();
  if(WiFi.status() == WL_CONNECTED)
  {
    Serial.println(" ");
    Serial.print("WiFi connected. IP address: ");
    Serial.println(WiFi.localIP());
  }
}

void setup()
{
  Serial.begin(115200);


  //connect to WiFi
  Serial.printf("Connecting to %s ", ssid);
  wfbegin:
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" CONNECTED");

  //init and get the time
  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
  printLocalTime();

  //disconnect WiFi as it's no longer needed
  WiFi.disconnect(true);
  WiFi.mode(WIFI_OFF);
  // if (RTC.lostPower())
  // {
  //   Serial.println("RTC power failure, resetting the time!");
  //   //rtc.adjust(DateTime(F(_DATE), F(TIME_)));
  if(count<5)
  {
    count++;
    goto wfbegin;
  }
  if (! RTC.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }
  RTC.begin();
  // The following lines can be uncommented to set the date and time
  RTC.adjust(DateTime(yea, mont, d, hou, minu, sec)); // Set Day-of-Week to SUNDAY
  // rtc.setTime(12, 0, 0);     // Set the time to 12:00:00 (24hr format)
  //rtc.setDate(1, 1, 2014);   // Set the date to January 1st, 2014
  //rtc.adjust(DateTime(_DATE, __TIME_));
}

void loop()
{
  delay(1000);
  // printLocalTime();
  DateTime now = RTC.now();
  
  Serial.print(now.year());
  Serial.print(".");
  Serial.print(now.month());
  Serial.print(".");
  Serial.print(now.day());
  Serial.print(".");
  
  Serial.print(now.hour() -1);
  Serial.print(":");
  Serial.print(now.minute());
  Serial.print(":");
  Serial.print(now.second());
  Serial.println();

  if (1 == timeSyncNeeded)
  {
    ConnectLastWifi();
    if(WiFi.status() == WL_CONNECTED)
    {
      SyncTime_NTPtoESP();
      SyncTime_ESPtoDS1307();
      timeSyncNeeded = 0;
      timeSyncFailedDebounceCounter = TIME_SYNC_DEBOUNCE_COUNTER;
      timeValidFlag = 1;
      Serial.println(" ");
      Serial.println("NTP -> ESP -> DS1307 time sync finished!");
    }
    else
    {
      Serial.println(" ");
      Serial.println("NTP -> ESP -> DS1307 time sync failed!");
      if(timeSyncFailedDebounceCounter > 0)
      {
        timeSyncFailedDebounceCounter--;
      }
      else if (0 == timeSyncFailedDebounceCounter)
      {
        timeValidFlag = 0;
      }
      SyncTime_DS1307toESP();
      Serial.println("No WiFi -> Offline mode!");
    }
    timeSyncNeeded = 0;
  }


}