// 1. Include the necessary libraries
#include <Wire.h> // Essential for I2C communication
#include <LiquidCrystal_I2C.h>

// 2. Configure your LCD
// !!! CHANGE 0x27 to YOUR LCD's I2C address found by the scanner !!!
const int LCD_ADDRESS = 0x27;
const int LCD_COLUMNS = 20; // For a 20-character wide display
const int LCD_ROWS = 4;     // For a 4-line display

// Create an LCD object
LiquidCrystal_I2C lcd(LCD_ADDRESS, LCD_COLUMNS, LCD_ROWS);

// 3. Define pins for button and LED
const int buttonPin = 2; // Button to toggle status and LED
const int rotLed = 13;   // LED to indicate status

// 4. Define String variables for display messages
String Elektronik_JJ = "Elektronik 2025";
String Name = "CHAUDHARY";
String Status1 = "Status: EIN"; // Status when LED is ON
String Status2 = "Status: AUS"; // Status when LED is OFF

// 5. Variables for toggle logic
boolean isLedOn = false;             // Tracks the current state of the LED (ON or OFF)
int currentButtonState;              // Current reading from the button
int previousButtonState = HIGH;      // Previous reading from the button (INPUT_PULLUP starts HIGH)

void setup() {
  // 6. Initialize the LCD
  lcd.init();
  lcd.backlight();

  // 7. Set up the button pin with INPUT_PULLUP
  pinMode(buttonPin, INPUT_PULLUP);

  // 8. Set up the LED pin as an OUTPUT
  pinMode(rotLed, OUTPUT);
  digitalWrite(rotLed, LOW); // Start with LED OFF

  // 9. Display initial messages on the LCD
  lcd.setCursor(0, 0); // Column 0, Row 0
  lcd.print(Elektronik_JJ);

  lcd.setCursor(0, 1); // Column 0, Row 1
  lcd.print(Name);

  delay(2000); // Show initial messages for 2 seconds
  lcd.clear();   // Clear the LCD for status messages
}

void loop() {
  // 10. Read the current state of the button
  currentButtonState = digitalRead(buttonPin);

  // 11. Check for a button press (state change from HIGH to LOW)
  if (previousButtonState == HIGH && currentButtonState == LOW) {
    // Button was just pressed, toggle the LED state
    isLedOn = !isLedOn; // Flip the state (true to false, or false to true)
    
    // Short delay for basic debouncing
    delay(50); 
  }

  // 12. Update the previous button state for the next loop iteration
  previousButtonState = currentButtonState;

  // 13. Update LED and LCD based on the 'isLedOn' state
  lcd.setCursor(0, 0); // Set cursor for status message

  if (isLedOn) {
    digitalWrite(rotLed, HIGH); // Turn LED ON
    lcd.print(Status1);         // Display "Status: EIN"
  } else {
    digitalWrite(rotLed, LOW);  // Turn LED OFF
    lcd.print(Status2);         // Display "Status: AUS"
  }

  // 14. Small delay at the end of the loop
  // This delay was 100ms. If the LCD update seems slow or flickery,
  // you might adjust this or the debouncing delay.
  // For now, let's remove the main loop delay if the debouncing delay is sufficient.
  // Consider if you need a delay here or if the 50ms debounce is enough.
  // For faster responsiveness, a smaller or no delay here is better if debouncing is handled.
  // Let's try with a smaller delay or rely on the debounce delay.
  delay(50); // A small delay to make LCD updates readable and prevent too rapid looping.
}