package com.dj;

import java.util.Arrays;
import java.util.Comparator;
import java.util.Random;

public class Main {

    public static void main(String[] args) {

        Integer five = 5;
        Integer[] others = {0, 5, 10, -50, 50};

        for (Integer i : others){
            int val = five.compareTo(i);
            System.out.printf("%d %s %d: compareTo=%d %n ", five,(val == 0 ? "==": (val < 0) ? "<":">"),i,val);
        }

        String banana = "banana";
        String[] fruit = {"apple","banana","pear","BANANA"};
        for (String s : fruit){
            int val = banana.compareTo(s);
            System.out.printf("%s %s %s: compareTo=%d%n", banana,(val ==0 ? "==" : (val < 0) ? "<" : ">"),s,val);
        }

        Arrays.sort(fruit);
        System.out.println(Arrays.toString(fruit));

        System.out.println("A:" + (int)'A' + " " + "a:" + (int)'a');
        System.out.println("B:" + (int)'B' + " " + "b:" + (int)'b');
        System.out.println("P:" + (int)'P' + " " + "p:" + (int)'p');

        Student tim = new Student("Tim");
        Student[] students = {new Student("Zach"),new Student("Tim"), new Student("Ann")};

        Arrays.sort(students);
        System.out.println(Arrays.toString(students));

        System.out.println("result = " + tim.compareTo(new Student("TIM")));

        Comparator<Student> gpaSorter =new StudentGPAComparator();
        Arrays.sort(students,gpaSorter.reversed());
        System.out.println(Arrays.toString(students));
    }
}

class StudentGPAComparator implements Comparator<Student>{

    @Override
    public int compare(Student o1, Student o2){
        return (o1.gpa + o1.name).compareTo(o2.gpa + o2.name);
    }
}
class Student implements Comparable<Student>{


    private static int LAST_ID =1000;
    private static Random random = new Random();

    String name;
    private int id;
    protected double gpa;


    public Student(String name) {
        this.name = name;
        id = LAST_ID++;
        gpa = random.nextDouble(1.0,4.0);
    }

    @Override
    public String toString() {
        return "%d - %s (%.2f)".formatted(id,name,gpa);
    }

    @Override
    public int compareTo(Student o) {
        return Integer.valueOf(id).compareTo(Integer.valueOf(o.id));
    }

//    @Override
//    public int compareTo(Object o) {
//        Student other = (Student) o;
//        return name.compareTo(other.name);
//    }
}