//String message[3][6];   amount of messages read per time  (update_id, name_id, name, lastname, chat_id, text)
//bot.message[0][0] = "";   All messages have been replied - reset new messages

//--------------------------------------------------------------------------------------------------------------

// Libaries
#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>
#include <ESP8266TelegramBOT.h>
#include <ArduinoJson.h>
#include <ESP8266Ping.h>
#include <WiFiUdp.h>
#include <NTPClient.h>

// Telegram-Variablen
#define BOTtoken "1214264165:AAHxjThsX6UAisiCDu1C02nAv3ErZNbFnfM"
#define BOTname "BobbyBot"
#define BOTusername "@BobbyTheOneAndOnlyBot"
TelegramBOT bot(BOTtoken, BOTname, BOTname);

// Wifi-Variablen
String chat_id = "426600237";
String message_text = "";
const char* wifi_ssid = "SchneckenAufKaffee";
const char* wifi_password = "hf8CnyjPwrhc";
WiFiClientSecure net_ssl;
const IPAddress google_ping_ip(192, 168, 0, 1);

// Program-Variablen
boolean internet_access = true;
boolean wifi_access = true;

// Zeit-Variablen
const long utc_offset_ms = 7200;
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
String t1, t2;
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "europe.pool.ntp.org", utc_offset_ms);

//--------------------------------------------------------------------------------------------------------------

// Main Code
void setup() 
{
  Serial.begin(115200);   
  delay(3000);
  
  // Connect to Wifi network
  Serial.print("Connecting to wifi ");
  Serial.println(wifi_ssid); 
  WiFi.mode(WIFI_STA);
  WiFi.begin(wifi_ssid, wifi_password);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.println("No WiFi-Access!");
  }
  Serial.println("Wifi connected");
  
  // Test internet connection
  if (Ping.ping(google_ping_ip))
  {
    Serial.println("Internet connection successful");
  } 
  else
  {
    Serial.println("Internet connection unsuccessful");
  }

  //Time-Server Begin
  timeClient.begin();
  
  // Telegram-Bot Bootup
  Serial.println("Booting telegram-bot");
  delay(1000);
  bot.begin();
  message_text = "Bot online";
  bot.sendMessage(chat_id, message_text, "");
  Serial.println("Telegram-Bot online");
  Serial.println("");
  Serial.println("Beginning Work...");
}

//--------------------------------------------------------------------------------------------------------------

void loop() 
{
  // Uhrzeit abfragen 
  timeClient.update();
  t1 = String(timeClient.getHours()) + ":" + String(timeClient.getMinutes()) + ":" + String(timeClient.getSeconds());
  Serial.println(t1);
  
  // Internetverbindung prüfen
  while (Ping.ping(google_ping_ip) != true)
  {
    internet_access = false;
    Serial.println("No Ping-Response!");
    
    // WLAN-Verbindung prüfen
    while (WiFi.status() != WL_CONNECTED)
    {
      wifi_access = false;
      Serial.println("No WiFi-Access!");
      WiFi.disconnect();
      delay(5000);
      WiFi.begin(wifi_ssid, wifi_password);
      delay(5000);
    }
    delay(5000);
  }
  timeClient.update();  
  t2 = String(timeClient.getHours()) + ":" + String(timeClient.getMinutes()) + ":" + String(timeClient.getSeconds());

  // Störungsmeldung zusammensetzen, falls eine Störung vorlag
  if (wifi_access == false or internet_access == false)
  {
    message_text = "Verbindungsstörung erkannt! ";
    if (wifi_access = false)
    {
      message_text += "WiFi-Verbinung ";
    }
    else
    {
      message_text += "Internet-Verbindung ";
    }
    message_text += "ausgefallen zwischen ";
    message_text += String(t1);
    message_text += "ms und ";
    message_text += String(t2);
    message_text += "ms.";

    // Nachricht absenden
    bot.sendMessage(chat_id, message_text, "");

    // Fehlervariablen zurücksetzen
    wifi_access = true;
    internet_access = true;
  }
  //Sleep
  delay(55 000);
}