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/* Sketch ist eine Mischung aus dem Sketch für die Testung der SIM7000G https://github.com/Xinyuan-LilyGO/LilyGO-T-SIM7000G/blob/master/examples/Arduino_TinyGSM/AllFunctions/AllFunctions.ino
und dem GSM Code Example der ESP_Mail_Client Libary https://github.com/mobizt/ESP-Mail-Client/commit/c6ce44ffcd86a94b812cea049716b109f8c0dbc0#diff-2fe767a3f54685ccde84ec2c14d6f12f6fb0cb93a03e8953dbfeb5d01f2dc72e */

#define TINY_GSM_MODEM_SIM7000
#include <TinyGsmClient.h>
#define TINY_GSM_RX_BUFFER 1024 // Set RX buffer to 1Kb
#define SerialAT Serial1


#define TINY_GSM_TEST_GPRS    true
#define TINY_GSM_USE_WIFI     false
#define TINY_GSM_POWERDOWN    true

// Setze GSM-PIN, falls vorhanden -->muss auch definert werden wenn kein PIN nötig ist
#define GSM_PIN ""

// Deine GPRS-Zugangsdaten der SIM Karte
const char apn[]  = "iot.1nce.net";     // APN
const char gprsUser[] = "";
const char gprsPass[] = "";

#include <ESP_Mail_Client.h>
#include <SPI.h>
#include <SD.h>
#include <Ticker.h>

#define uS_TO_S_FACTOR 1000000ULL  // Conversion factor for micro seconds to seconds
#define TIME_TO_SLEEP  60          // Time ESP32 will go to sleep (in seconds)

//Pinout für SIM Karte
#define UART_BAUD   115200
#define PIN_DTR     25
#define PIN_TX      27
#define PIN_RX      26
#define PWR_PIN     4

//Pinout für SD Karte
#define SD_MISO     2
#define SD_MOSI     15
#define SD_SCLK     14
#define SD_CS       13
#define LED_PIN     12

int counter, lastIndex, numberOfPieces = 24;
String pieces[24], input;

TinyGsm modem(SerialAT);

TinyGsmClient gsm_client(modem); // basic non-secure client



/* The smtp host name e.g. smtp.gmail.com for GMail or smtp.office365.com for Outlook or smtp.mail.yahoo.com*/
#define SMTP_HOST "****"
#define SMTP_PORT 465
/* The sign in credentials*/
#define AUTHOR_EMAIL "*******"
#define AUTHOR_PASSWORD "*****"
/* Recipient's email*/
#define RECIPIENT_EMAIL "*******"

SMTPSession smtp; //Erstellung Klasse und Objekt

// Callback-Funktion, um den Status des E-Mail-Versands zu überprüfen
void smtpCallback(SMTP_Status status);

// Wartezeit vor der Anmeldung am E-Mail-Server (in Millisekunden)
const unsigned long emailLoginDelay = 20000; // Zum Beispiel 10 Sekunden

void setup()
{
    // Baudrate
    Serial.begin(115200);
    delay(10);

 // Set LED OFF
    pinMode(LED_PIN, OUTPUT);
    digitalWrite(LED_PIN, HIGH);

    pinMode(PWR_PIN, OUTPUT);
    digitalWrite(PWR_PIN, HIGH);

    // Starting the machine requires at least 1 second of low level, and with a level conversion, the levels are opposite
    delay(1000);
    digitalWrite(PWR_PIN, LOW);

Serial.println("\nWait...");

    delay(1000);

    SerialAT.begin(UART_BAUD, SERIAL_8N1, PIN_RX, PIN_TX);

    // Restart takes quite some time
    // To skip it, call init() instead of restart()
    Serial.println("Initializing modem...");
    if (!modem.restart()) {
        Serial.println("Failed to restart modem, attempting to continue without restarting");
    }
}

void loop()
{

    // Restart takes quite some time
    // To skip it, call init() instead of restart()
    Serial.println("Initializing modem...");
    if (!modem.init()) {
        Serial.println("Failed to restart modem, attempting to continue without restarting");
    }

    String name = modem.getModemName();
    delay(500);
    Serial.println("Modem Name: " + name);

    String modemInfo = modem.getModemInfo();
    delay(500);
    Serial.println("Modem Info: " + modemInfo);


#if TINY_GSM_TEST_GPRS
    // Unlock your SIM card with a PIN if needed
    if ( GSM_PIN && modem.getSimStatus() != 3 ) {
        modem.simUnlock(GSM_PIN);
    }
#endif

    modem.sendAT("+CFUN=0");
    if (modem.waitResponse(10000L) != 1) {
        DBG(" +CFUN=0  false ");
    }
    delay(200);

    /*
      2 Automatic
      13 GSM only
      38 LTE only
      51 GSM and LTE only
    * * * */

    bool res = modem.setNetworkMode(2);
    if (!res) {
        DBG("setNetworkMode  false ");
        return ;
    }
    delay(200);

    /*
      1 CAT-M
      2 NB-Iot
      3 CAT-M and NB-IoT
    * * */
    res = modem.setPreferredMode(3);
    if (!res) {
        DBG("setPreferredMode  false ");
        return ;
    }
    delay(200);

    modem.sendAT("+CFUN=1");
    if (modem.waitResponse(10000L) != 1) {
        DBG(" +CFUN=1  false ");
    }
    delay(200);

  #if TINY_GSM_TEST_GPRS

    SerialAT.println("AT+CGDCONT?");
    delay(500);
    if (SerialAT.available()) {
        input = SerialAT.readString();
        for (int i = 0; i < input.length(); i++) {
            if (input.substring(i, i + 1) == "\n") {
                pieces[counter] = input.substring(lastIndex, i);
                lastIndex = i + 1;
                counter++;
            }
            if (i == input.length() - 1) {
                pieces[counter] = input.substring(lastIndex, i);
            }
        }
        // Reset for reuse
        input = "";
        counter = 0;
        lastIndex = 0;

        for ( int y = 0; y < numberOfPieces; y++) {
            for ( int x = 0; x < pieces[y].length(); x++) {
                char c = pieces[y][x];  //gets one byte from buffer
                if (c == ',') {
                    if (input.indexOf(": ") >= 0) {
                        String data = input.substring((input.indexOf(": ") + 1));
                        if ( data.toInt() > 0 && data.toInt() < 25) {
                            modem.sendAT("+CGDCONT=" + String(data.toInt()) + ",\"IP\",\"" + String(apn) + "\",\"0.0.0.0\",0,0,0,0");
                        }
                        input = "";
                        break;
                    }
                    // Reset for reuse
                    input = "";
                } else {
                    input += c;
                }
            }
        }
    } else {
        Serial.println("Failed to get PDP!");
    }


    Serial.println("\n\n\nWaiting for network...");
    if (!modem.waitForNetwork()) {
        delay(10000);
        return;
    }

    if (modem.isNetworkConnected()) {
        Serial.println("Network connected");
    }

    Serial.println("\n---Starting GPRS TEST---\n");
    Serial.println("Connecting to: " + String(apn));
    if (!modem.gprsConnect(apn, gprsUser, gprsPass)) {
        delay(10000);
        return;
    }

    if (modem.isNetworkConnected()) {
    Serial.println("Gerät ist mit dem Mobilfunknetzwerk verbunden.");
  } else {
    Serial.println("Gerät ist NICHT mit dem Mobilfunknetzwerk verbunden.");
    // Hier können Sie geeignete Maßnahmen ergreifen, wenn keine Netzwerkverbindung besteht.
  }

    Serial.print("GPRS status: ");
    if (modem.isGprsConnected()) {
        Serial.println("connected");
    } else {
        Serial.println("not connected");
    }

    String ccid = modem.getSimCCID();
    Serial.println("CCID: " + ccid);

    String imei = modem.getIMEI();
    Serial.println("IMEI: " + imei);

    String cop = modem.getOperator();
    Serial.println("Operator: " + cop);

    IPAddress local = modem.localIP();
    Serial.println("Local IP: " + String(local));

    int csq = modem.getSignalQuality();
    Serial.println("Signal quality: " + String(csq));

    SerialAT.println("AT+CPSI?");     //Get connection type and band
    delay(500);
    if (SerialAT.available()) {
        String r = SerialAT.readString();
        Serial.println(r);
    }

    Serial.println("\n---End of GPRS TEST---\n");
  #endif

if (modem.isNetworkConnected()) {
        Serial.println("Network connected");
    }


Session_Config config;

  config.server.host_name = SMTP_HOST;
  config.server.port = SMTP_PORT;
  config.login.email = AUTHOR_EMAIL;
  config.login.password = AUTHOR_PASSWORD;
  config.login.user_domain = F("127.0.0.1");

  // Declare the SMTP_Message class variable to handle to message being transport
  SMTP_Message message;

  // Set the message headers
  message.sender.name = F("ESP Mail");
  message.sender.email = AUTHOR_EMAIL;
  message.subject = F("Test sending plain text Email using GSM module");
  message.addRecipient(F("Someone"), RECIPIENT_EMAIL);

  // Set the message content
  message.text.content = "This is simple plain text message";
 
  // Set debug option
  smtp.debug(1);

  // Set the callback function to get the sending results
  smtp.callback(smtpCallback);

  smtp.setGSMClient(&gsm_client, &modem, GSM_PIN, apn, gprsUser, gprsPass);

  // Verzögerung vor der Anmeldung am E-Mail-Server
    delay(emailLoginDelay);

  // Versuchen Sie, sich am E-Mail-Server anzumelden und E-Mails zu senden
  smtp.connect(&config);

  // Start sending Email and close the session
  if (!MailClient.sendMail(&smtp, &message))
    Serial.println("Error sending Email, " + smtp.errorReason());
}


void smtpCallback(SMTP_Status status)
{
 
  Serial.println(status.info());

  if (status.success())
  {
    // See example for how to get the sending result
  }
  
}