public class Car {

    private String regNo, make, model, deliverName;
    private int passengerCapacity;
    private boolean avaiable;
    private Booking currentBookings[] = new Booking[5];
    private Booking pastBookings[] = new Booking[5];

    public Car(String regNo, String make, String model, String deliverName, int passengerCapacity) {

        this.regNo = regNo;
        this.make = make;
        this.model = model;
        this.deliverName = deliverName;
        this.passengerCapacity = passengerCapacity;

        // bussiness validations

        // 1 - reg no validation
        if (this.regNo.length() > 6) {
            // handle the error
        } else {
            // if its less than 6 digits check if first 3 are alph followed by numbers
            // check if first letters are not Alphabetics
            if (!Character.isAlphabetic(this.regNo.charAt(0)) && !Character.isAlphabetic(this.regNo.charAt(1))
                    && !Character.isAlphabetic(this.regNo.charAt(2))) {
                // handle the error
            }
            // check if lest of the chars are not numbers
            else if (!Character.isDigit(this.regNo.charAt(0)) && !Character.isDigit(this.regNo.charAt(1))
                    && !Character.isDigit(this.regNo.charAt(2))) {
                // handle the error
            }
        }

        // 2 - passenger capacity should now be greater than 0 and less than 10 ;
        if (this.passengerCapacity <= 0) {
            this.passengerCapacity = 1;
        } else if (this.passengerCapacity >= 10) {
            this.passengerCapacity = 9;
        }

    }

    public boolean book(String firstName, String lastName, DateTime required, int numPassengers) {
        if (this.currentBookings.length > 5) {
            // car is not avaiable for bookings
            this.avaiable = false;
            return false;
        } else {
            // car is avaiable
            this.avaiable = true;
        }

        // check if datetime greater than todays datetime
        //

        // code

        //

        if (numPassengers > this.passengerCapacity) {
            // car cannot have this amount of passengers
            this.avaiable = false;
            return false;
        }


        //after all validation make a booking object
        Booking booking = new Booking(required, this, firstName, lastName, 1.50);
        this.currentBookings[0] = booking;

    }

    public String getDetails(){
        return " RegNo :" + this.regNo + "\n Make & Model :"+ this.make+" "+this.model+"\n Drivers Name:"+this.deliverName+"\n Capacity:"+this.passengerCapacity+"\n Avaiable:"+this.avaiable;
    }

    public String toString() {
        return this.regNo+":"+this.make+":"+this.model+":"+this.deliverName+":"+this.passengerCapacity+":"+this.avaiable;

    }
}

public class Booking {

    private DateTime pickupDateTime;
    private Car car;
    private String  firstName, lastName;
    private double bookingFee, kilometresTravelled, tripFee;
    private int numPassengers;

    public Booking(DateTime pickupDateTime, Car car, String firstName, String lastName, double bookingFee) {
        this.pickupDateTime = pickupDateTime;
        this.car = car;
        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
        this.bookingFee = bookingFee;

    }

    public setKilometersTravelled(double km){
        this.kilometresTravelled = km;
    }

    double calculateFee(){
        return ((30/100)*this.bookingFee) * this.kilometresTravelled;
    }

}