#include <SoftwareSerial.h>
SoftwareSerial SIM900A(8, 7);
// Define the pin numbers for push button and LED
const int buttonPin = 2; // Change this to your button pin
const int ledPin = 13;   // Change this to your LED pin

// Variables to store button state and timing
int buttonState = 0;
unsigned long buttonPressTime = 0;
bool ledOn = false;
bool buttonReleased = false;
int sit_time = 15;
int XX = 3;

void setup() {
  pinMode(buttonPin, INPUT_PULLUP); // Use internal pull-up resistor for the button
  pinMode(ledPin, OUTPUT);
  SIM900A.begin(115200);   // Setting the baud rate of GSM Module
  Serial.begin(9600);    // Setting the baud rate of Serial Monitor (Arduino)
  Serial.println ("SIM900A Ready");
  delay(100);
  Serial.println ("Type s to send message or r to receive message");
  delay(15000);
  SendMessage();
}

void loop() {
  sit_time = 15; // Reset sit_time
  while (digitalRead(buttonPin) == HIGH && sit_time != 0) {
    // Decrement sit_time
    sit_time--;

    delay(1000);
    while (digitalRead(buttonPin) == LOW) {
      XX--;
      delay(1000);
    }
  }

  if (sit_time == 0) {
    digitalWrite(ledPin, HIGH); // Turn on LED
    delay(2000); // Delay for 2 seconds
    digitalWrite(ledPin, LOW); // Turn off LED
    SendMessage();
    sit_time = 15; // Reset sit_time
    return;
  }
  if (digitalRead(buttonPin) == LOW) {
    return;
    // Check if button is pressed during the countdown

  }
}


void SendMessage()
{
  Serial.println ("Sending Message");
  SIM900A.println("AT+CMGF=1");    //Sets the GSM Module in Text Mode
  delay(1000);
  Serial.println ("Set SMS Number");
  SIM900A.println("AT+CMGS=\"+966580224645\"\r"); //Mobile phone number to send message
  //540538259 SAFWAN 2
  //554418546 SAFWAN 1
  delay(1000);
  Serial.println ("Set SMS Content");
  SIM900A.println("Good 123?");// Messsage content
  delay(100);
  Serial.println ("Finish");
  SIM900A.println((char)26);// ASCII code of CTRL+Z
  delay(1000);
  Serial.println ("Message has been sent ->SMS Selesai dikirim");
}