//  makerguides.com: synchronizing ESP32 time with SNTP server

#include "WiFi.h"
#include "esp_sntp.h"

#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>

#define HARDWARE_TYPE MD_MAX72XX::FC16_HW


#define MAX_DEVICES 4
#define CLK_PIN   18 
#define DATA_PIN  23 
#define CS_PIN    5 
MD_Parola Display = MD_Parola(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);


const char* ssid = "---------";
const char* password = "-----------";

// https://github.com/nayarsystems/posix_tz_db/blob/master/zones.csv
//const char *timezone = "AEST-10AEDT,M10.1.0,M4.1.0/3"; //Sydney Australie
const char *timezone = "CET-1CEST,M3.5.0,M10.5.0/3";//PARIS

String Time, heure, minute;
String Formatted_date;

void initWiFi() {
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Attente connection wifi....");
  }
}

void initSNTP() {
  sntp_set_sync_interval(60 * 60 * 1000UL);  // 1 h
  esp_sntp_setoperatingmode(ESP_SNTP_OPMODE_POLL);
  esp_sntp_setservername(0, "pool.ntp.org");  
  esp_sntp_init();
  setenv("TZ", timezone, 1);
  tzset();
}

void wait4SNTP() {
  
  Serial.println("String Time, hour, minute;String Formatted_date;synchronizing...");
  while (sntp_get_sync_status() != SNTP_SYNC_STATUS_COMPLETED) {
    delay(100);
  }
  
}



void obtainTime() {
  // https://cplusplus.com/reference/ctime/tm/
  char buff1[4];
  char buff2[4];
  struct tm t;
  getLocalTime(&t);  
  sprintf(buff1, "%02d", t.tm_hour);
  sprintf(buff2,"%02d" , t.tm_min);
  Serial.println("Heures");
  Serial.println(buff1);
   Serial.println("Minutes");
  Serial.println(buff2);
  heure = buff1;
  minute = buff2;
  Time = heure +":"+ minute;
  Display. setTextAlignment(PA_CENTER);
  Display.print(Time);
}

void setup() 
{
  Serial.begin(115200);
  initWiFi();
  initSNTP();
  wait4SNTP();

  Display.begin();
  Display.setIntensity(0);
  Display.displayClear();
}

void loop()
 {
  obtainTime();
  delay(1000);
}