import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

public class BusFares extends Applet implements ActionListener {
    //declare global variables
    Label p1, p2, p3, p4;
    TextField age, tType, zone;
    Button order;
    String economy, premium;
    boolean student, pensioner;
    double tPrice;
    int z;

    public void init() {
        //instantiate variables
        p1 = new Label("Enter your age, ticket type (economy or premium) and desired zone (1, 2 or 3).");
        p2 = new Label("Age:");
        p3 = new Label("Type:");
        p4 = new Label("Zone:");
        age = new TextField(10);
        tType = new TextField(10);
        zone = new TextField(10);
        order = new Button("Order Ticket");

        //add elements in applet
        add (p1);
        add (p2);
        add (age);
        add (p3);
        add (tType);
        add (p4);
        add (zone);
        add (order);

        //add ActionListener to the button 'order'
        order.addActionListener(this);
        age.addActionListener(this);
        tType.addActionListener(this);
        zone.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e) {
        //instantiate variables
        student = Integer.parseInt(age.getText()) < 18;
        pensioner = Integer.parseInt(age.getText()) >= 64;
        z = Integer.parseInt(zone.getText());
        economy = tType.getText().trim();
        premium = tType.getText().trim();

        //setting price (tPrice) according to ticket type (tType) - economy or premium
        if (economy.equals("economy")) {
            switch (z) {
                case 1: tPrice = 4;
                break;
                case 2: tPrice = 6;
                break;
                case 3: tPrice = 7;
                break;
                default: showStatus("Economy: zone fail");
            }
        }
        else if (premium.equals("premium")) {
            switch (z) {
                case 1: tPrice = 6;
                break;
                case 2: tPrice = 7;
                break;
                case 3: tPrice = 7;
                break;
                default: showStatus("Premium: zone fail");
            }
        }
        else showStatus("tType fail");

        //determining discount based on age - $5 cap after discount
        if (student || pensioner){
            tPrice = tPrice*0.8;
            if (tPrice > 5) tPrice = 5;
        }
        else showStatus("Not student/pensioner");
        repaint();
    }

    public void paint (Graphics g) {
        g.drawString("Your ticket fee is $" + tPrice + ".", 20,100);
    }
}