#include <Servo.h>

int pirPin = 12; // Arduino pin the PIR sensor is connected to
int servoPin = 9; //Arduino pin the servo is connected to

int motionStatus = 0; // variable to store the PIR sensor's motion status (high or low)
int pirState = 0; // variable to track the state change

Servo scaryServo; // create servo object to control our servo

void setup() {
  Serial.begin(9600); // initialize the serial monitor
  pinMode(pirPin, INPUT); // set the Arduino pin that PIR sensor is connected to as an INPUT
  scaryServo.attach(servoPin); // attaches the servo on pin 9 to the servo object
  scaryServo.write(0); // start the servo at 0 degrees
  delay(5000); // give time for the PIR sensor to calibrate (30-60secs is best)
}

void loop() {
  if(Serial.available() > 0) { // Check if data is available to read from serial monitor
    int command = Serial.parseInt(); // Read the command from the serial monitor
    
    if(command == 1) { // If command is 1 (Espresso)
      Serial.println("Payment complete. Please wait for your Espresso.");
      
      while(true) { // Wait until motion is detected
        motionStatus = digitalRead(pirPin);
        if(motionStatus == HIGH) {
          scaryServo.write(90); // rotate the servo to 90 degrees
          Serial.println("Your Espresso is ready.");
          delay(5000); // Delay to give time to take the coffee
          scaryServo.write(0); // rotate the servo back to 0 degrees
          break; // Exit the loop once motion is detected
        }
      }
    }
    else if(command == 2) { // If command is 2 (Latte)
      Serial.println("Payment complete. Please wait for your Latte.");
      
      while(true) { // Wait until motion is detected
        motionStatus = digitalRead(pirPin);
        if(motionStatus == HIGH) {
          scaryServo.write(90); // rotate the servo to 90 degrees
          Serial.println("Your Latte is ready.");
          delay(5000); // Delay to give time to take the coffee
          scaryServo.write(0); // rotate the servo back to 0 degrees
          break; // Exit the loop once motion is detected
        }
      }
    }
    else if(command == 3) { // If command is 3 (Cappuccino)
      Serial.println("Payment complete. Please wait for your Cappuccino.");
      
      while(true) { // Wait until motion is detected
        motionStatus = digitalRead(pirPin);
        if(motionStatus == HIGH) {
          scaryServo.write(90); // rotate the servo to 90 degrees
          Serial.println("Your Cappuccino is ready.");
          delay(5000); // Delay to give time to take the coffee
          scaryServo.write(0); // rotate the servo back to 0 degrees
          break; // Exit the loop once motion is detected
        }
      }
    }
    else { // If command is not recognized
      Serial.println("Invalid selection.");
    }
  }
}