#include <LiquidCrystal.h>
#include <Servo.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

#define t1 10
#define t2 9
#define t3 8

#define IR_SENSOR_PIN 7
#define SERVO_PIN 6

#define GREEN_LED1 A0
#define GREEN_LED2 A2
#define GREEN_LED3 A4

#define RED_LED1 A1
#define RED_LED2 A3
#define RED_LED3 A5

Servo servoMotor;
int distanceThreshold = 150;

void setup() {
  lcd.begin(16,2);
  lcd.setCursor(0,0);
  
  

  pinMode(IR_SENSOR_PIN, INPUT_PULLUP);
  
  pinMode(GREEN_LED1, OUTPUT);
  pinMode(GREEN_LED2, OUTPUT);
  pinMode(GREEN_LED3, OUTPUT);
  
  pinMode(RED_LED1, OUTPUT);
  pinMode(RED_LED2, OUTPUT);
  pinMode(RED_LED3, OUTPUT);

  servoMotor.attach(SERVO_PIN);
  
  Serial.begin (9600);
}

long readDistance(int triggerPin, int echoPin) {
  
  pinMode(triggerPin, OUTPUT); 
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  pinMode(echoPin, INPUT);
  return pulseIn(echoPin, HIGH);
}

void handleLEDs(float distance, int greenLedPin, int redLedPin) {
  if (distance >= distanceThreshold){
    digitalWrite(greenLedPin, HIGH);
    digitalWrite(redLedPin, LOW);
    Serial.println("Empty slot!!");
  } else {
    digitalWrite(redLedPin, HIGH);
    digitalWrite(greenLedPin, LOW);
    Serial.println("Car is parked");
  }
}

void loop() {
  //... same code as above ...
  float d1 = 0.01723 * readDistance(t1, t1);
  float d2 = 0.01723 * readDistance(t2, t2);
  float d3 = 0.01723 * readDistance(t3, t3);
  
  Serial.println("d1 = " + String(d1) + "cm");
  Serial.println("d2 = " + String(d2) + "cm");
  Serial.println("d3 = " + String(d3) + "cm");
  
  if (digitalRead(IR_SENSOR_PIN) == LOW) { // Vehicle detected by IR sensor
    if (d1 > 100 || d2 > 100 || d3 > 100) {
      servoMotor.write(90); // Assuming 90 degrees opens the gate
      delay(500);
      servoMotor.write(0); // Assuming 0 degrees closes the gate after some time
      delay(500);
    } else {
      // Do nothing or maybe sound a buzzer to indicate parking full
    }
  }

  // Handle LEDs based on the distance readings
  handleLEDs(d1, GREEN_LED1, RED_LED1);
  handleLEDs(d2, GREEN_LED2, RED_LED2);
  handleLEDs(d3, GREEN_LED3, RED_LED3);
  
if (d1>100 & d2>100 & d3>100){
  lcd.setCursor(0,0);
  lcd.print("3 Slots Free");
  lcd.setCursor(0,1);
  lcd.print("Slot 1 2 3 Free");
  delay(500);
  }
else if((d1>100 & d2>100)|(d2>100 & d3>100)|(d3>100 & d1>100))
  {
  lcd.setCursor(0,0);
  lcd.print("2 Slots Free");
  lcd.setCursor(0,1);
    if(d1>100 & d2>100)
    lcd.print("Slot 1 & 2 Free");
    else if(d1>100 & d3>100)
    lcd.print("Slot 1 & 3 Free");
    else
    lcd.print("Slot 2 & 3 Free");
  delay(500);
  }
else if(d1<100 & d2<100 & d3<100)
  {
  lcd.setCursor(0,0);
  lcd.print("No Slot Free");
  lcd.setCursor(0,1);
  lcd.print("Parking Full");
  delay(500);
  }
else if((d1<100 & d2<100)|(d2<100 & d3<100)|(d3<100 & d1<100))
  {
  lcd.setCursor(0,0);
  lcd.print("1 Slot Free");
  lcd.setCursor(0,1);
    if(d1>100)
      lcd.print("Slot 1 is Free");
    else if (d2>100)
       lcd.print("Slot 2 is Free");
    else
       lcd.print("Slot 3 is Free");
  delay(500);
   }
  delay(100);
}