/*********
  Rui Santos
  Complete project details at https://randomnerdtutorials.com
  Based on the NTP Client library example
*********/

#include "WiFi.h"
//#include "NTPClient.h"
#include <WiFiUdp.h>

#include "Arduino.h"

#include <Udp.h>

#define SEVENZYYEARS 2208988800UL
#define NTP_PACKET_SIZE 48
#define NTP_DEFAULT_LOCAL_PORT 1337

class NTPClient {
  private:
    UDP*          _udp;
    bool          _udpSetup       = false;

    const char*   _poolServerName = "pool.ntp.org"; // Default time server
    IPAddress     _poolServerIP;
    int           _port           = NTP_DEFAULT_LOCAL_PORT;
    long          _timeOffset     = 0;

//    unsigned long _updateInterval = 60000;  // In ms

    unsigned long _currentEpoc    = 0;      // In s
    unsigned long _lastUpdate     = 0;      // In ms

    byte          _packetBuffer[NTP_PACKET_SIZE];

    void          sendNTPPacket();

  public:
    NTPClient(UDP& udp);
    NTPClient(UDP& udp, long timeOffset);
    NTPClient(UDP& udp, const char* poolServerName);
    NTPClient(UDP& udp, const char* poolServerName, long timeOffset);
    NTPClient(UDP& udp, const char* poolServerName, long timeOffset, unsigned long updateInterval);
    NTPClient(UDP& udp, IPAddress poolServerIP);
    NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset);
    NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset, unsigned long updateInterval);
    unsigned long _updateInterval = 60000; 
    /**
     * Set time server name
     *
     * @param poolServerName
     */
    void setPoolServerName(const char* poolServerName);

    /**
     * Starts the underlying UDP client with the default local port
     */
    void begin();

    /**
     * Starts the underlying UDP client with the specified local port
     */
    void begin(int port);

    /**
     * This should be called in the main loop of your application. By default an update from the NTP Server is only
     * made every 60 seconds. This can be configured in the NTPClient constructor.
     *
     * @return true on success, false on failure
     */
    bool update();

    /**
     * This will force the update from the NTP Server.
     *
     * @return true on success, false on failure
     */
    bool forceUpdate();

    int getDay() const;
    int getHours() const;
    int getMinutes() const;
    int getSeconds() const;

    /**
     * Changes the time offset. Useful for changing timezones dynamically
     */
    void setTimeOffset(int timeOffset);

    /**
     * Set the update interval to another frequency. E.g. useful when the
     * timeOffset should not be set in the constructor
     */
    void setUpdateInterval(unsigned long updateInterval);

    /**
     * @return time formatted like `hh:mm:ss`
     */
    String getFormattedTime() const;
    String getFormattedDate();
    String getFullFormattedTime() ;
    /**
     * @return time in seconds since Jan. 1, 1970
     */
    unsigned long getEpochTime() const;

    /**
     * Stops the underlying UDP client
     */
    void end();
};


NTPClient::NTPClient(UDP& udp) {
  this->_udp            = &udp;
}

NTPClient::NTPClient(UDP& udp, long timeOffset) {
  this->_udp            = &udp;
  this->_timeOffset     = timeOffset;
}

NTPClient::NTPClient(UDP& udp, const char* poolServerName) {
  this->_udp            = &udp;
  this->_poolServerName = poolServerName;
}

NTPClient::NTPClient(UDP& udp, IPAddress poolServerIP) {
  this->_udp            = &udp;
  this->_poolServerIP   = poolServerIP;
  this->_poolServerName = NULL;
}

NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset) {
  this->_udp            = &udp;
  this->_timeOffset     = timeOffset;
  this->_poolServerName = poolServerName;
}

NTPClient::NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset){
  this->_udp            = &udp;
  this->_timeOffset     = timeOffset;
  this->_poolServerIP   = poolServerIP;
  this->_poolServerName = NULL;
}

NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset, unsigned long updateInterval) {
  this->_udp            = &udp;
  this->_timeOffset     = timeOffset;
  this->_poolServerName = poolServerName;
  this->_updateInterval = updateInterval;
}

NTPClient::NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset, unsigned long updateInterval) {
  this->_udp            = &udp;
  this->_timeOffset     = timeOffset;
  this->_poolServerIP   = poolServerIP;
  this->_poolServerName = NULL;
  this->_updateInterval = updateInterval;
}

void NTPClient::begin() {
  this->begin(NTP_DEFAULT_LOCAL_PORT);
}

void NTPClient::begin(int port) {
  this->_port = port;

  this->_udp->begin(this->_port);

  this->_udpSetup = true;
}

bool NTPClient::forceUpdate() {
  #ifdef DEBUG_NTPClient
    Serial.println("Update from NTP Server");
  #endif

  // flush any existing packets
  while(this->_udp->parsePacket() != 0)
    this->_udp->flush();

  this->sendNTPPacket();

  // Wait till data is there or timeout...
  byte timeout = 0;
  int cb = 0;
  do {
    delay ( 10 );
    cb = this->_udp->parsePacket();
    if (timeout > 100) return false; // timeout after 1000 ms
    timeout++;
  } while (cb == 0);

  this->_lastUpdate = millis() - (10 * (timeout + 1)); // Account for delay in reading the time

  this->_udp->read(this->_packetBuffer, NTP_PACKET_SIZE);

  unsigned long highWord = word(this->_packetBuffer[40], this->_packetBuffer[41]);
  unsigned long lowWord = word(this->_packetBuffer[42], this->_packetBuffer[43]);
  // combine the four bytes (two words) into a long integer
  // this is NTP time (seconds since Jan 1 1900):
  unsigned long secsSince1900 = highWord << 16 | lowWord;

  this->_currentEpoc = secsSince1900 - SEVENZYYEARS;

  return true;  // return true after successful update
}

bool NTPClient::update() {
  if ((millis() - this->_lastUpdate >= this->_updateInterval)     // Update after _updateInterval
    || this->_lastUpdate == 0) {                                // Update if there was no update yet.
    if (!this->_udpSetup) this->begin();                         // setup the UDP client if needed
    return this->forceUpdate();
  }
  return false;   // return false if update does not occur
}

unsigned long NTPClient::getEpochTime() const {
  return this->_timeOffset + // User offset
         this->_currentEpoc + // Epoc returned by the NTP server
         ((millis() - this->_lastUpdate) / 1000); // Time since last update
}

int NTPClient::getDay() const {
  return (((this->getEpochTime()  / 86400L) + 4 ) % 7); //0 is Sunday
}
int NTPClient::getHours() const {
  return ((this->getEpochTime()  % 86400L) / 3600);
}
int NTPClient::getMinutes() const {
  return ((this->getEpochTime() % 3600) / 60);
}
int NTPClient::getSeconds() const {
  return (this->getEpochTime() % 60);
}

String NTPClient::getFormattedTime() const {
  unsigned long rawTime = this->getEpochTime();
  unsigned long hours = (rawTime % 86400L) / 3600;
  String hoursStr = hours < 10 ? "0" + String(hours) : String(hours);

  unsigned long minutes = (rawTime % 3600) / 60;
  String minuteStr = minutes < 10 ? "0" + String(minutes) : String(minutes);

  unsigned long seconds = rawTime % 60;
  String secondStr = seconds < 10 ? "0" + String(seconds) : String(seconds);

  return hoursStr + ":" + minuteStr + ":" + secondStr;
}

void NTPClient::end() {
  this->_udp->stop();

  this->_udpSetup = false;
}

void NTPClient::setTimeOffset(int timeOffset) {
  this->_timeOffset     = timeOffset;
}

void NTPClient::setUpdateInterval(unsigned long updateInterval) {
  this->_updateInterval = updateInterval;
}

void NTPClient::setPoolServerName(const char* poolServerName) {
    this->_poolServerName = poolServerName;
}

void NTPClient::sendNTPPacket() {
  // set all bytes in the buffer to 0
  memset(this->_packetBuffer, 0, NTP_PACKET_SIZE);
  // Initialize values needed to form NTP request
  // (see URL above for details on the packets)
  this->_packetBuffer[0] = 0b11100011;   // LI, Version, Mode
  this->_packetBuffer[1] = 0;     // Stratum, or type of clock
  this->_packetBuffer[2] = 6;     // Polling Interval
  this->_packetBuffer[3] = 0xEC;  // Peer Clock Precision
  // 8 bytes of zero for Root Delay & Root Dispersion
  this->_packetBuffer[12]  = 49;
  this->_packetBuffer[13]  = 0x4E;
  this->_packetBuffer[14]  = 49;
  this->_packetBuffer[15]  = 52;

  // all NTP fields have been given values, now
  // you can send a packet requesting a timestamp:
  if  (this->_poolServerName) {
    this->_udp->beginPacket(this->_poolServerName, 123);
  } else {
    this->_udp->beginPacket(this->_poolServerIP, 123);
  }
  this->_udp->write(this->_packetBuffer, NTP_PACKET_SIZE);
  this->_udp->endPacket();
}
String NTPClient::getFormattedDate() {
   time_t rawtime = this->getEpochTime();
   struct tm * ti;
   ti = localtime (&rawtime);

   uint16_t year = ti->tm_year + 1900;
   String yearStr = String(year);

   uint8_t month = ti->tm_mon + 1;
   String monthStr = month < 10 ? "0" + String(month) : String(month);

   uint8_t day = ti->tm_mday;
   String dayStr = day < 10 ? "0" + String(day) : String(day);

   
   return yearStr + "-" + monthStr + "-" + dayStr;
}
String NTPClient::getFullFormattedTime() {
  
   time_t rawtime = this->getEpochTime();
   struct tm * ti;
   ti = localtime (&rawtime);

   uint16_t year = ti->tm_year + 1900;
   String yearStr = String(year);

   uint8_t month = ti->tm_mon + 1;
   String monthStr = month < 10 ? "0" + String(month) : String(month);

   uint8_t day = ti->tm_mday;
   String dayStr = day < 10 ? "0" + String(day) : String(day);

   uint8_t hours = ti->tm_hour;
   String hoursStr = hours < 10 ? "0" + String(hours) : String(hours);

   uint8_t minutes = ti->tm_min;
   String minuteStr = minutes < 10 ? "0" + String(minutes) : String(minutes);

   uint8_t seconds = ti->tm_sec;
   String secondStr = seconds < 10 ? "0" + String(seconds) : String(seconds);

   return yearStr + "-" + monthStr + "-" + dayStr + " " +
          hoursStr + ":" + minuteStr + ":" + secondStr;
}



// Replace with your network credentials
const char ssid[] = "Wokwi-GUEST";  //  your network SSID (name)
const char pass[] = "";       // your network password

// Define NTP Client to get time
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP);
bool LED=1;
int indY;
int indM;
int indD;
int indH;
int indS;
int indm;
// Variables to save date and time
String formattedDate;
String dayStamp;
String YearStamp;
String MonthStamp;
String HourStamp;
String MinStamp;
String SecStamp;
String timeStamp;
String formattedFullTime;
void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);
  Serial.print("Connecting to ");
  pinMode(2,OUTPUT);
  Serial.println(ssid);
  WiFi.begin(ssid,pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  // Print local IP address and start web server
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

// Initialize a NTPClient to get time
  timeClient.begin();
  
  // Set offset time in seconds to adjust for your timezone, for example:
  // GMT +1 = 3600
  // GMT +8 = 28800
  // GMT -1 = -3600
  // GMT 0 = 0
 // timeClient._updateInterval=60000;
  timeClient.setTimeOffset(3600);

}
void loop() {
  digitalWrite(2,LED);
  LED=1-LED;
  delay(1000);
  
//  update tous les 60 sec ici   timeClient._updateInterval=60000; // In ms
if(timeClient.update()) {;

   formattedFullTime=timeClient.getFullFormattedTime();
   Serial.println(formattedFullTime);
  // Extract date
 indY=formattedFullTime.indexOf("-");
 YearStamp=formattedFullTime.substring(0,indY);
 indM=formattedFullTime.indexOf("-",indY+1);
 MonthStamp=formattedFullTime.substring(indY+1,indM);
 indD=formattedFullTime.indexOf(" ",indM+1);
 dayStamp=formattedFullTime.substring(indM+1,indD);
 indH=formattedFullTime.indexOf(":",indD+1);
 HourStamp=formattedFullTime.substring(indD+1,indH);
 indm=formattedFullTime.indexOf(":",indH+1);
 MinStamp=formattedFullTime.substring(indH+1,indm);
SecStamp=formattedFullTime.substring(indm+1,indm+3);
 // int splitT = formattedDate.indexOf("-");
//  dayStamp = formattedDate.substring(0, splitT);
  Serial.print("DATE: ");
  Serial.println(dayStamp);
  Serial.print("Month: ");
  Serial.println(MonthStamp);
  Serial.print("Year: ");
  Serial.println(YearStamp);
  Serial.print("Hour: ");
  Serial.println(HourStamp);
  Serial.print("Minute: ");
  Serial.println(MinStamp);
  Serial.print("seconde: ");
  Serial.println(SecStamp);
}
  // Extract time
//  timeStamp = formattedDate.substring(splitT+1, formattedDate.length()-1);
//  Serial.print("HOUR: ");
//  Serial.println(timeStamp);
//  delay(1000);
}