#include <NTPClient.h>
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>

char server[] = "mail.smtp2go.com";  

const char *ssid     = "Enter your SSID";
const char *password = "Enter your password";
const int ir = 2;
String tt;
int cnt =0;
WiFiClient Client;              //define wifi client as client

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org", 19800, 60000);

// You can specify the time server pool and the offset (in seconds, can be
// changed later with setTimeOffset() ). Additionaly you can specify the
// update interval (in milliseconds, can be changed using setUpdateInterval() ).


void setup() {
  Serial.begin(115200);
  pinMode(ir, INPUT);

  WiFi.begin(ssid, password);
  while ( WiFi.status() != WL_CONNECTED ) {
    delay ( 500 );
    Serial.print ( "." );
  }
  timeClient.begin();
}

void loop() {
  timeClient.update();
  int obs = digitalRead(ir);
  tt=timeClient.getFormattedTime();

  Serial.println(tt);
  Serial.print("Box Closed/Open : ");
  Serial.println(obs);
  Serial.print("No. of times Box Opened : "); 
  Serial.println(cnt); 
  
  if(tt<"15:02:00")
  {
    if(obs==0) // condition when box is open before the time
    {
      cnt++;
    }
  }
  
  if(tt=="15:02:00")
  {
    if(cnt==0)
    {
      Serial.println("Take the medicines");
      sendEmail();
      Serial.print("Mail sent to:"); 
      Serial.println(" The recipient");
      Serial.println("");
    }
    else
    {
      Serial.println("Medicine already taken");
    } 
  }

  delay(1000);
}

byte sendEmail()
{
  if (Client.connect(server, 2525) == 1)        // connect to smtp server with port address 2525
  {
    Serial.println(F("connected to server"));
  } 
  else 
  {
    Serial.println(F("connection failed"));
    return 0;
  }
  if (!emailResp())         // if connection failed return now
    return 0;
  //
  Serial.println(F("Sending EHLO"));
  Client.println("EHLO www.example.com");      // Send command EHLO previosly it was HELO********************
  if (!emailResp()) 
    return 0;
    
  Serial.println(F("Sending auth login"));
  Client.println("AUTH LOGIN");
  if (!emailResp()) 
    return 0;
  //  
   Serial.println(F("Sending User"));
  Client.println("c2VuZGVyQHh5ei5jb20="); //base64, ASCII encoded SMTP Username   
  if (!emailResp()) 
    return 0;

  Serial.println(F("Sending Password"));
  Client.println("cGFzc3dvcmQ=");   //base64, ASCII encoded SMTP Password    
  if (!emailResp()) 
    return 0;
  
  Serial.println(F("Sending From"));
    Client.println(F("MAIL From: sender@xyz.com"));       
  if (!emailResp())  
    return 0;
  // change to recipient address
  Serial.println(F("Sending To"));
  Client.println(F("RCPT To: receiver@xyz.com"));    
  
  if (!emailResp()) 
    return 0;
  
  Serial.println(F("Sending DATA"));
  Client.println(F("DATA"));
  if (!emailResp()) 
    return 0;
  Serial.println(F("Sending email"));
  
  Client.println(F("To:  receiver@xyz.com "));                
  
  Client.println(F("From: sender@xyz.com "));  
  Client.println(F("Subject: Medicine Reminder\r\n"));
  Client.println(F("Hey Abhishek\n"));
  Client.println(F("This is a reminder regarding your medicines"));
  Client.println(F("You forgot to take your medicines on time. Please take them immediately."));
  //
  Client.println(F("."));
  if (!emailResp()) 
    return 0;
  //
  Serial.println(F("Sending QUIT"));
  Client.println(F("QUIT"));
  if (!emailResp()) 
    return 0;
  //
  Client.stop();
  Serial.println(F("disconnected"));
  return 1;
}

byte emailResp()
{
  byte responseCode;
  byte readByte;
  int loopCount = 0;

  while (!Client.available()) 
  {
    delay(1);
    loopCount++;
    // Wait for 20 seconds and if nothing is received, stop.
    if (loopCount > 20000) 
    {
      Client.stop();
      Serial.println(F("\r\nTimeout"));
      return 0;
    }
  }

  responseCode = Client.peek();
  while (Client.available())
  {
    readByte = Client.read();
    Serial.write(readByte);
  }

  if (responseCode >= '4')
  {
    //  efail();
    return 0;
  }
  return 1;
}