/**
 * Car models car in a passenger train.
 *
 * @author L.S. Marshall, SCE
 * @version 1.01 October 9, 2007
 * @version 1.2 January 2018 - printTicket now returns String, method uses getId() convention
 */

public class Car
{
    /** This car's identifier. */
    private int id;
   
    /**
     * true == this car is a business-class car,
     * false == this car is an economy-class car.
     */
    private boolean businessClass;
    
    public static final double BUSINESS_SEAT_COST = 125.0;
    public static final double ECONOMY_SEAT_COST = 50.0;    
  
    /** The number of seats in a car. */
    public static final int ECONOMY_SEATS = 40;
    public static final int BUSINESS_SEATS = 30;    
   
    /** The list of this car's seats. */
    private Seat[] seats;
   
    /**
     * Constructs a new Car object with the specified id.
     * If parameter isBusinessClass is true, the car is a business-class
     * car. If parameter isBusinessClass is false, the car is an
     * economy-class car.
     */
    public Car(int carId, boolean isBusinessClass) {
        this.id = carId;
        this.businessClass = isBusinessClass;
       
        if(this.businessClass) {
            this.seats = new Seat[BUSINESS_SEATS]; 
        }
        else {
            this.seats = new Seat[ECONOMY_SEATS];
        }
       
        for(int i = 0; i < this.seats.length; i++) {
            if(this.businessClass) {
                this.seats[i] = new Seat(i + 1, BUSINESS_SEAT_COST);
            }
            else {
                this.seats[i] = new Seat(i + 1, ECONOMY_SEAT_COST);
            }
        }
    }

    public int getNumberOfSeats() { return this.seats.length;   }
    public double getCost(int seatNo) { return this.seats[seatNo].getPrice();   }
    public boolean isBooked(int seatNo) { return this.seats[seatNo].isBooked();  }
    
    public int getNumberofFreeSeats() { 
        int count = 0;
        
        for(int i = 0; i < this.seats.length; i++) {
            if(!this.seats[i].isBooked()) {
                count++;
            }
        }
	return count;
    }
    
    /** 
     * Returns true if this is a business-class car,
     * false if this is an economy-class car.
     * @return
     */
    public boolean isBusinessClass()
    {
        return this.businessClass;
    }
 
    /**
     * Returns the id of this car.
     */
    public int getId()
    {
	return this.id;
    }
  
    /**
     * This method is called when the specified seat has been booked,
     * to print a ticket for that seat.
     * @return Returns a string representation of the ticket
     */
    private String printTicket(int seatNo)
    {
        System.out.println("Car: " + this.id + " - Seat: " + this.seats[seatNo].getNumber() 
                + " - Price: " + this.seats[seatNo].getPrice());
        return "Car: " + this.id + " - Seat: " + this.seats[seatNo].getNumber() 
                + " - Price: " + this.seats[seatNo].getPrice();
    }   
 
    /**
     * Attempts to book a seat. If successful, this method prints a 
     * String containing the ticket
     * If no seats are available, this method returns null.
     * Throws IllegalStateException if internal inconsistency found.
     * (exception optional)
     */
    public String bookNextSeat()
    {
        int nextSeat = this.seats.length - this.getNumberofFreeSeats();
        
        if(nextSeat < this.seats.length) {
            this.seats[nextSeat].book();
            return this.printTicket(nextSeat);
        }
        else {
            return null;
        }
    }

    /** 
     * Cancels the booking for the specified seat, which must be between
     * 1 and the maximum number of seats in the car.
     * If the seat number is valid and if the seat has been reserved, this
     * method cancels the booking for that seat and returns true. 
     * If the seat number is not valid, this method returns false. 
     * If the seat number is valid, but the seat has not been reserved, 
     * this method returns false.
     * Throws IllegalStateException if internal inconsistency found.
     * (exception optional)
     */
    public boolean cancelSeat(int seatNo)
    {
        if(seatNo > 0 && seatNo <= this.seats.length 
                && this.seats[seatNo - 1].cancelBooking()) {
            return true;
        }
	return false;
    }    
    
    public String toString() {
	return "Car " + this.id + " : " + this.getNumberofFreeSeats() 
                + " free, $" + this.seats[0].getPrice();
    }
}