import java.io.File;
import javax.swing.JOptionPane;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Collections;
import java.io.IOException;
import java.util.Scanner;

/**
 * COP3337 Example
 *
 * @author Bill Kraynek
 */
public class ComparatorExample {

    public static void main(String[] args) throws IOException {
        ArrayList<Person> people = new ArrayList<>();
        Scanner fileScanner = new Scanner(new File("people.data"));
        while (fileScanner.hasNext()) {
            Scanner s = new Scanner(fileScanner.nextLine());
            String idNumber = s.next();
            String first = s.next();
            String last = "";
            while (s.hasNext()) {
                last += s.next() + " ";
            } // end while
            if (!last.equals("")) {
                last = last.substring(0, last.length() - 1);
            } // end if
            Person aPerson = new Person(idNumber, first, last);
            // add aPerson to the end of the ArrayList
            people.add(aPerson);
        } // end while
        // The Collections class has a static method sort.
        // sort takes an ArrayList paramenter
        // The objects in the ArrayList must be Comparable
        // The ArrayList is sorted according to the natural comparator
        Collections.sort(people);
        display(people, "The names in \"natural\" order are:\n");
        // The Collections class has a second static method sort.
        // This sort takes an ArrayList paramenter and a Comparator parameter
        // The ArrayList is sorted according to the Comparator
        Collections.sort(people, new NameLengthOrder());
        display(people, "The names in first name length order are:\n");
        Collections.sort(people, new Person.idNumberOrder());
        display(people, "The names in idNumber order are:\n");

    } // end main

    public static void display(ArrayList<Person> a, String title) {
        String out = title + "\n";
        for (int i = 0; i < a.size(); i++) {
            // the toString() method is automatically called on
            // a.get(i) since we are concatenating to a String
            // the "correct" toString() method is called
            // because of polymorphism
            out += a.get(i) + "\n";
        } // end for
        JOptionPane.showMessageDialog(null, out);
    } // end display

    // Comparator is an interface with one method to implement, the compare method.
    // This class implements compare so the order is by first name length.
    static class NameLengthOrder implements Comparator<Person> {

        public int compare(Person personA, Person personB) {
            int lengthA = personA.getFirstName().length() + personA.getLastName().length();
            int lengthB = personB.getFirstName().length() + personB.getLastName().length();
            int difference = lengthB - lengthA;
            if (difference != 0) {
                return difference;
            }
            // if no difference in name length compare "naturally"
            return personA.compareTo((personB));
        } // end compare
    } // end NameLengthOrder

} // end ComparatorExample