#include <WiFi.h>
#include <LiquidCrystal_I2C.h>
#include <ESP_Mail_Client.h>
#include <DHT.h>

#define DHTPIN 26 // Pin connected to DHT22
#define DHTTYPE DHT22 // DHT sensor type

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

#define SMTP_HOST "smtp.gmail.com"
#define SMTP_PORT 465

/* The sign in credentials */
#define AUTHOR_EMAIL ""
#define AUTHOR_PASSWORD ""

/* Recipient's email*/
#define RECIPIENT_EMAIL ""
/* The SMTP Session object used for Email sending */

SMTPSession smtp;
/* Callback function get the Email sending status */

void smtpCallback(SMTP_Status status);

void setup() {
  Serial.begin(115200);
  Serial.print("Connecting to WiFi");
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");

  lcd.init();
  lcd.backlight();

  lcd.setCursor(2,0);
  lcd.print("IOT");
  lcd.setCursor(0,1);
  lcd.print("CW2");
}

void loop() {
 float humidity = dht.readHumidity(); //get value of humidity
 float temperature = dht.readTemperature(); //get value of temperature

  Serial.println("Temperature:");
  Serial.println(temperature);
  Serial.println("degrees celcius");

  Serial.println("Humidity");
  Serial.println(humidity);
  Serial.println("%");

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Temp: " + String(temperature, 2) + " C");
  lcd.setCursor(0,1);
  lcd.print("Humidity: " + String(humidity, 1) + "%");

  delay(3000); 

  if (temperature > 40) {
        SendEmail("Temperature was over 40 degrees celcius!", "Alert! high Temperature.");
        Serial.println("High temperature message sent");

      }
      if (humidity < 60) {
        SendEmail("Humidity was over 60%!", "Alert! high Humidity.");
         Serial.println("High humidity message sent");
        Serial.println("==================================");
      }
}

void SendEmail(String htmlMsg, String MessageSubject)
{
  smtp.debug(1);

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

  /* Declare the ESP_Mail_Session for user defined session credentials */
  ESP_Mail_Session session;

  /* Set the session config */
  session.server.host_name = SMTP_HOST;
  session.server.port = SMTP_PORT;
  session.login.email = AUTHOR_EMAIL;
  session.login.password = AUTHOR_PASSWORD;

  /* Set the NTP config time */
  session.time.ntp_server = F("pool.ntp.org,time.nist.gov");
  session.time.gmt_offset = -5;
  session.time.day_light_offset = 0;
/* Declare the message class */
  SMTP_Message message;

  /* Set the message headers */
  message.sender.name = "CW2 trial";
  message.sender.email = AUTHOR_EMAIL;
  message.subject = MessageSubject;
  message.addRecipient("receiver1", RECIPIENT_EMAIL);

  message.html.content = htmlMsg;
  message.html.charSet = F("us-ascii");
  message.html.transfer_encoding = Content_Transfer_Encoding::enc_7bit;
  message.priority = esp_mail_smtp_priority::esp_mail_smtp_priority_normal;
  /* Connect to the server */
  if (!smtp.connect(&session /* session credentials */))
    Serial.println("Error connecting to SMTP server, " + smtp.errorReason());
  /* Start sending Email and close the session */
  if (!MailClient.sendMail(&smtp, &message))
  Serial.println("Error sending Email, " + smtp.errorReason());
  
}

/* Callback function to get the Email sending status */
void smtpCallback(SMTP_Status status){
/* Print the current status */
Serial.println(status.info());

/* Print the sending result */
if (status.success()){
Serial.println("----------------");
ESP_MAIL_PRINTF("Message sent success: %d\n", status.completedCount());
ESP_MAIL_PRINTF("Message sent failled: %d\n", status.failedCount());
Serial.println("----------------\n");

struct tm dt;
for (size_t i = 0; i < smtp.sendingResult.size(); i++){

/* Get the result item */
SMTP_Result result = smtp.sendingResult.getItem(i);
time_t ts = (time_t)result.timestamp;
localtime_r(&ts, &dt);
ESP_MAIL_PRINTF("Message No: %d\n", i + 1);
ESP_MAIL_PRINTF("Status: %s\n", result.completed ? "success" : "failed");
ESP_MAIL_PRINTF("Date/Time: %d/%d/%d %d:%d:%d\n", dt.tm_year + 1900, dt.tm_mon + 1, dt.tm_mday, dt.tm_hour, dt.tm_min, dt.tm_sec);
ESP_MAIL_PRINTF("Recipient: %s\n", result.recipients.c_str());
ESP_MAIL_PRINTF("Subject: %s\n", result.subject.c_str());
}

Serial.println("----------------\n");
smtp.sendingResult.clear();

} 


}