// Import required library
#include <LiquidCrystal_I2C.h>

// Setup the LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);

int startTime = 0;

#define START_BUTTON_PIN 26
#define STOP_BUTTON_PIN 27

// Declare the falg variables for buttons
bool startButtonPressed = false;
bool stopButtonPressed = false;


void setup() {
  Serial.begin(9600);
  // Intialize the LCD and trun on the backlight
  lcd.init();
  lcd.backlight();

  // Print the Welcome message
  lcd.setCursor(3, 0);
  lcd.print("Welcome to ");
  lcd.setCursor(3, 1);
  lcd.print("Stopwatch");


  pinMode(START_BUTTON_PIN, INPUT_PULLUP);
  pinMode(STOP_BUTTON_PIN, INPUT_PULLUP);

  // Set the dealy of 1 seconds
  delay(1000);

  // Recording the starting time
  startTime = millis(); 

  
}

void loop() {
  // Get the button states for start and stop
  int startButtonState = digitalRead(START_BUTTON_PIN);
  int stopButtonState = digitalRead(STOP_BUTTON_PIN);

  if(startButtonState == LOW && !startButtonPressed){
    startButtonPressed = true;
    stopButtonPressed = false;
    startTime = millis(); 
    
  }

  if(stopButtonState  == LOW && !stopButtonPressed) {
    stopButtonPressed = true;
    startButtonPressed = false;
  }
  
  if(startButtonPressed){
    // Set the LCD cursor to initial position
    lcd.setCursor(0,0);

    // Getting the elapsed time
    int currentTime = millis() - startTime;
    
    // Converting milliseconds to seconds, minutes, and hours
    int seconds = currentTime / 1000;
    int minutes = seconds / 60;
    int hours = minutes / 60;

    // Display the simulated time in the LCD
    lcd.print("Time: ");
    lcd.print(hours);
    lcd.print(":");
    lcd.print(minutes % 60); 
    lcd.print(":");
    lcd.print(seconds % 60);
    lcd.print(":");
    lcd.print(currentTime %1000); 
  }
  
}