#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>

const int buttonPin = 2;
const int redLedPin = 7;
const int greenLedPin = 8;
const int servoPin = 9;

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address, 16 columns, 2 rows
Servo myServo;

bool isOccupied = false;
bool buttonState = false;
bool lastButtonState = false;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 15;
int servoPosition = 90;  // Initial servo position

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(redLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);
  myServo.attach(servoPin);
  myServo.write(servoPosition);
  
  lcd.begin(16, 2);  // LCD initialization
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Parking Status:");
  lcd.setCursor(0, 1);
  lcd.print("Vacant");
  
  Serial.begin(9600);
}

void loop() {
  int reading = digitalRead(buttonPin);
  
  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }
  
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;
      
      if (buttonState == LOW) {
        isOccupied = !isOccupied;
        updateLCD();
        
        if (isOccupied) {
          servoPosition = 0;  // Open the gate/barrier
        }
      }
    }
  }
  
  lastButtonState = reading;
  
 if((isOccupied == true) && (servoPosition == 0)){
    myServo.write(0);
    digitalWrite(redLedPin, HIGH);
    digitalWrite(greenLedPin, LOW);
    // Wait for a duration (e.g., 5 seconds) before closing the gate/barrier
    delay(5000);
    
    servoPosition = 90;  // Close the gate/barrier
    isOccupied = false;
    updateLCD();
  } else {
    myServo.write(servoPosition);
    digitalWrite(redLedPin, LOW);
    digitalWrite(greenLedPin, HIGH);
  }

  /*if (isOccupied) {
    digitalWrite(redLedPin, HIGH);
    digitalWrite(greenLedPin, LOW);
  } else {
    digitalWrite(redLedPin, LOW);
    digitalWrite(greenLedPin, HIGH);
  }*/

  delay(100);
}

void updateLCD() {
  lcd.setCursor(0, 1);
  
  if (isOccupied) {
    lcd.print("Occupied  ");
  } else {
    lcd.print("Vacant    ");
  }
}