import java.util.Scanner;
import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ArrayList<Person> list = new ArrayList<>();
        
        int choice;
        do {
            System.out.println("\nChoose one of the options:");
            System.out.println("1- Enter the information of a faculty");
            System.out.println("2- Enter the information of a student");
            System.out.println("3- Print tuition invoice for a student");
            System.out.println("4- Print faculty information");
            System.out.println("5- Enter the information of a staff member");
            System.out.println("6- Print the information of a staff member");
            System.out.println("7- Delete a person");
            System.out.println("8- Exit Program\n");
            System.out.print("Enter your choice: ");
            
            choice = scanner.nextInt();
            
            switch (choice) {
                case 1:
                    enterFacultyInfo(scanner, list);
                    break;
                case 2:
                    enterStudentInfo(scanner, list);
                    break;
                case 3:
                    printStudentInfo(scanner, list);
                    break;
                case 4:
                    printFacultyInfo(scanner, list);
                    break;
                case 5:
                    // Enter staff information
                    break;
                case 6:
                    // Print staff information
                    break;
                case 7:
                    // Delete a person
                    break;
                case 8:
                    System.out.println("Exiting Program.");
                    break;
                default:
                    System.out.println("Invalid choice. Please try again.");
            }
        } while (choice != 8);
    }
    
    private static void enterFacultyInfo(Scanner scanner, ArrayList<Person> list) {
        System.out.println("Enter the faculty info:");
        System.out.print("Name: ");
        String name = scanner.next();
        
        String id;
        do {
            System.out.print("id: ");
            id = scanner.next();
            if (idFormat(id) && !duplicateCheck(id, list)) {
                break;
            } else {
                System.out.println("Invalid ID format or duplicate id.");
            }
        } while (true);
        
        String rank;
        do {
            System.out.print("Rank: ");
            rank = scanner.next().toUpperCase();
            if (rank.equals("PROFESSOR") || rank.equals("ADJUNCT")) {
                break;
            } else {
                System.out.println(rank + " is an invalid rank.");
            }
        } while (true);
        
        String department;
        do {
            System.out.print("Department: ");
            department = scanner.next().toUpperCase();
            if (department.equals("MATHEMATICS") || department.equals("ENGLISH") || department.equals("ENGINEERING")) {
                break;
            } else {
                System.out.println(department + " is an invalid department.");
            }
        } while (true);
        
        Faculty faculty = new Faculty(name, id, department, rank);
        list.add(faculty);
    }
    
    private static void enterStudentInfo(Scanner scanner, ArrayList<Person> list) {
        System.out.println("Enter the student info:");
        System.out.print("Name: ");
        String studentName = scanner.next();
        
        String studentId;
        do {
            System.out.print("Id: ");
            studentId = scanner.next();
            if (idFormat(studentId) && !duplicateCheck(studentId, list)) {
                break;
            } else {
                System.out.println("Invalid ID format or duplicate id.");
            }
        } while (true);
        
        double gpa;
        do {
            System.out.print("Gpa: ");
            gpa = scanner.nextDouble();
            if (gpa >= 0 && gpa <= 4.5) {
                break;
            } else {
                System.out.println("Please enter a GPA between 0 and 4.5.");
            }
        } while (true);
        
        int credits;
        do {
            System.out.print("Credit Hours: ");
            credits = scanner.nextInt();
            if (credits >= 0 && credits <= 100) {
                break;
            } else {
                System.out.println("Please enter a reasonable number of credits.");
            }
        } while (true);
        
        Student student = new Student(studentName, studentId, gpa, credits);
        list.add(student);
    }
    
    private static void printStudentInfo(Scanner scanner, ArrayList<Person> list) {
        System.out.println("Enter the Student's id:");
        String studentId = scanner.next();
        boolean found = false;
        for (Person person : list) {
            if (person instanceof Student && person.getId().equals(studentId)) {
                found = true;
                person.print();
                break;
            }
        }
        if (!found) {
            System.out.println(studentId + " not found.");
        }
    }
    
    private static void printFacultyInfo(Scanner scanner, ArrayList<Person> list) {
        System.out.println("Enter the Faculty’s id:");
        String facultyId = scanner.next();
        boolean found = false;
        for (Person person : list) {
            if (person instanceof Faculty && person.getId().equals(facultyId)) {
                found = true;
                person.print();
                break;
            }
        }
        if (!found) {
            System.out.println(facultyId + " not found.");
        }
    }
    
    private static boolean idFormat(String id) {
        // Implement ID format validation
        return true; // Placeholder
    }
    
    private static boolean duplicateCheck(String id, ArrayList<Person> list) {
        // Implement duplicate ID check
        return false; // Placeholder
    }
}

class Person {
    private String name;
    private String id;
    
    public Person(String name, String id) {
        this.name = name;
        this.id = id;
    }
    
    public String getId() {
        return id;
    }
    
    public void print() {
        System.out.println("Name: " + name);
        System.out.println("ID: " + id);
    }
}

class Faculty extends Person {
    private String department;
    private String rank;
    
    public Faculty(String name, String id, String department, String rank) {
        super(name, id);
        this.department = department;
        this.rank = rank;
    }
    
    @Override
    public void print() {
        super.print();
        System.out.println("Department: " + department);
        System.out.println("Rank: " + rank);
    }
}

class Student extends Person {
    private double gpa;
    private int credits;
    
    public Student(String name, String id, double gpa, int credits) {
        super(name, id);
        this.gpa = gpa;
        this.credits = credits;
    }
    
    @Override
    public void print() {
        super.print();
        System.out.println("GPA: " + gpa);
        System.out.println("Credits: " + credits);
    }
}