TeamApp

import java.util.ArrayList;
import java.util.Collections;

public class TeamApp {

    private static final double MIN_GPA = 3.67; // required by the assignment

    public static void main(String[] args) {
        // Scenario A: has candidates
        runScenario(buildScenarioA());

        System.out.println(); // blank line between the two scenarios

        // Scenario B: no candidate
        runScenario(buildScenarioB());
    }

    private static void runScenario(Team<Student> studentList) {
        // 1) Applicants
        System.out.println("The following students want to join the competition team:");
        if (studentList.hasNoMember()) {
            System.out.println("No student/candidate in the list.");
        } else {
            System.out.print(studentList); // Team#toString prints one per line
        }
        System.out.println();

        // 2) Total number (own section, like the sample)
        System.out.println("Total number of students = " + studentList.getNumberOfMembers());
        System.out.println();

        // 3) Not fulfilling the requirement
        System.out.println("Students who do not fulfill cumulative GPA requirement ("
                + String.format("%.2f", MIN_GPA) + "):");
        Team<Student> candidates = new Team<>();
        for (Student s : studentList.toArrayListCopy()) {
            Student standard = new Student("standard", MIN_GPA);
            if (s.compareTo(standard) >= 0) {
                candidates.addToTeam(s);
            } else {
                System.out.println("Remove: " + s);
            }
        }
        System.out.println();

        // 4) Candidates who HAVE fulfilled the requirement
        System.out.println("Candidates who have fulfilled cumulative GPA requirement ("
                + String.format("%.2f", MIN_GPA) + "):");
        if (candidates.hasNoMember()) {
            System.out.println("No candidate has been selected!");
        } else {
            System.out.print(candidates);
        }
        System.out.println();

        // 5) Remove the last submitted candidate
        System.out.println("The following candidate who submitted the application last has been removed from the list:");
        Student removed = candidates.removeFromTeam(); // remove last (stack behavior)
        if (removed == null) {
            System.out.println("No candidate in the list.");
        } else {
            System.out.println("Remove: " + removed);
        }
        System.out.println();

        // 6) Sort candidates in DESC order and print
        System.out.println("The candidates are sorted in a descending order based on their cumulative GPA :");
        if (candidates.hasNoMember()) {
            System.out.println("No candidate in the list.");
        } else {
            ArrayList<Student> finalList = candidates.toArrayListCopy();
            Collections.sort(finalList, Collections.reverseOrder()); // descending by GPA
            for (Student s : finalList) {
                System.out.println(s);
            }
        }
    }

    // ---------- Data sets ----------
    // Scenario A: has candidates (custom data; not copying the sample numbers)
    private static Team<Student> buildScenarioA() {
        Team<Student> t = new Team<>();
        t.addToTeam(new Student("Alice", 3.55));
        t.addToTeam(new Student("Brian", 3.74));   // candidate
        t.addToTeam(new Student("Chloe", 3.28));
        t.addToTeam(new Student("Diego", 3.10));
        t.addToTeam(new Student("Eva", 3.92));     // candidate
        t.addToTeam(new Student("Frank", 3.45));
        t.addToTeam(new Student("Grace", 3.88));   // candidate
        t.addToTeam(new Student("Henry", 3.67));   // candidate (edge meets spec)
        return t;
    }

    // Scenario B: no candidate (all below 3.67)
    private static Team<Student> buildScenarioB() {
        Team<Student> t = new Team<>();
        t.addToTeam(new Student("Iris", 3.21));
        t.addToTeam(new Student("Jason", 3.50));
        t.addToTeam(new Student("Kara", 3.33));
        return t;
    }
}