/*************************************************************************************************
                                      PROGRAMMINFO
**************************************************************************************************
Funktion: ESP32 WInternet Clock mit OLED Display 1,3" V2
**************************************************************************************************
Version: 17.03.2022
**************************************************************************************************
Board: ESP32vn IoT UNO V1.0.4

**************************************************************************************************
C++ Arduino IDE V1.8.13
**************************************************************************************************
Einstellungen:
https://dl.espressif.com/dl/package_esp32_index.json
http://dan.drown.org/stm32duino/package_STM32duino_index.json
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json
**************************************************************************************************
Librarys
- WiFi.h V0.16.1
**************************************************************************************************
OLED Schriftarten:
https://arduino-projekte.info/schriftarten-fuer-oled-display/#torussansbold8_8r

 **************************************************************************************************/
#include <WiFi.h>
#include "time.h"

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

const char* ntpServer = "de.pool.ntp.org";
const long  gmtOffset_sec = 0;
const int   daylightOffset_sec = 7200;

#include <Arduino.h>
#include <U8g2lib.h>

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
unsigned long delayTime;

void setup(){
  Serial.begin(115200);
    u8g2.begin();

  // Connect to Wi-Fi
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi 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);
}

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

void printLocalTime(){
  struct tm timeinfo;
  if(!getLocalTime(&timeinfo)){
    Serial.println("Failed to obtain time");
    return;
  }


  Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
  Serial.print("Day of week: ");
  Serial.println(&timeinfo, "%A");
  Serial.print("Month: ");
  Serial.println(&timeinfo, "%B");
  Serial.print("Day of Month: ");
  Serial.println(&timeinfo, "%d");
  Serial.print("Year: ");
  Serial.println(&timeinfo, "%Y");
  Serial.print("Hour: ");
  Serial.println(&timeinfo, "%H");
//Serial.print("Hour (12 hour format): ");
//Serial.println(&timeinfo, "%I");
  Serial.print("Minute: ");
  Serial.println(&timeinfo, "%M");
  Serial.print("Second: ");
  Serial.println(&timeinfo, "%S");

  Serial.println();


Serial.println("=================================");
Serial.println("Internet Uhr");

    u8g2.setFont(u8g2_font_courB12_tf);
    u8g2.firstPage();

    do {

      u8g2.setCursor(10, 10);
      u8g2.print("Internet Clock");
      //u8g2.setCursor(30, 22);
      //u8g2.print("Tegernsee");


u8g2.setFont(u8g2_font_courR10_tf);
      u8g2.setCursor(10, 30);
      u8g2.print(&timeinfo, "%A");
      u8g2.setCursor(10, 45);
      u8g2.print(&timeinfo, "%d %B %Y");
      u8g2.setCursor(10, 60);
      u8g2.print(&timeinfo, "%H:%M:%S");

      } while ( u8g2.nextPage() );
     delay(delayTime);



}