import java.util.*;

public class EnrollmentCortes 
{
    public static void main(String[] args) 
    {
      Scanner scanner = new Scanner(System.in);
      ArrayList<String> ccsStudents = new ArrayList<>();

        while (true) {
            System.out.println("\nCCS Student Enrollment System");
            System.out.println("1. Enroll Student");
            System.out.println("2. Unenroll Student");
            System.out.println("3. Print All Students");
            System.out.println("4. Sort Students");
            System.out.println("5. Search Student");
            System.out.println("6. Exit");
            
            System.out.print("\nEnter your choice: ");
            int choice = scanner.nextInt();
            scanner.nextLine(); 

            switch (choice) {
                case 1:
                    //ENROLL
                    // To ask for the number of student you want to enroll
                    System.out.print("Enter the number of students to enroll: ");
                    int numberOfStudents = scanner.nextInt();
                    scanner.nextLine();
                    //Entering the name of the students
                    for (int i = 0; i < numberOfStudents; i++) {
                        System.out.print("Enter student name to enroll: ");
                        String studentName = scanner.nextLine();
                        enrollStudent(ccsStudents, studentName);
                    }
                    break;
                case 2:
                    //UNENROLL
                    System.out.print("Enrolled Students: \n");
                    printStudents(ccsStudents);
                    System.out.print("Enter Student Name to unenroll: ");
                    String unenrollName = scanner.nextLine();
                    unenrollStudent(ccsStudents, unenrollName);
                    break;

                case 3:
                    //PRINT
                    System.out.println("\nEnrolled Students: ");
                    printStudents(ccsStudents);
                  
                    break;

                case 4:
                    //SORT (Alphabetical Order)
                    sortStudents(ccsStudents);
                    printStudents(ccsStudents);
                    break;

                case 5:
                    //SEARCH (Name of student)
                    System.out.print("Enter student name to search: ");
                    String searchName = scanner.nextLine();
                    searchStudent(ccsStudents, searchName);
                    break;

                case 6:
                    System.out.println("Exiting the program.");
                    scanner.close();
                    System.exit(0);

                default:
                    System.out.println("Invalid choice. Please select a valid option.");
            }
        }
    }

    // Function to enroll a student
    private static void enrollStudent(ArrayList<String> students, String studentName) {
        students.add(studentName);
        System.out.println(studentName + " has been enrolled.");
    }

    // Function to unenroll a student
    private static void unenrollStudent(ArrayList<String> students, String studentName) {
        if (students.contains(studentName)) {
            students.remove(studentName);
            System.out.println(studentName + " has been unenrolled.");
        } else {
            System.out.println(studentName + " is not enrolled.");
        }
    }

    // Function to print all students
    private static void printStudents(ArrayList<String> students) {
        for (int i = 0; i < students.size(); i++) {
        String student = students.get(i);
        System.out.println("[" + (i + 1) + "] " + student);        }
    }

    // Function to sort students alphabetically
    private static void sortStudents(ArrayList<String> students) {
        Collections.sort(students);
        System.out.println("Students have been sorted alphabetically.");
    }

    // Function to search for a student
    private static void searchStudent(ArrayList<String> students, String studentName) {
        if (students.contains(studentName)) {
            System.out.println("\n FOUND: " + studentName + " is currently enrolled.");
        } else {
            System.out.println(studentName + " is not enrolled.");
        }
    }
}