import java.util.Calendar;
import java.util.HashMap;
import java.util.Random;

class Person {
    protected String name;
    protected String surname;
    protected Calendar birthday;

    public void setName(String name) {
        this.name = name;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }

    public void setBirthday(Calendar date) {
        this.birthday = date;
    }

    public String getName() {
        return this.name;
    }

    public String getSurname() {
        return this.surname;
    }

    public int getAge() {
        int year = Calendar.getInstance().get(Calendar.YEAR);
        int birthYear = this.birthday.get(Calendar.YEAR);
        return year-birthYear;
    }
}

class Student extends Person {
    private HashMap<Subject, Mark> marks = new HashMap<>();

    public void setMarks(HashMap marks) {
        this.marks = marks;
    }

    public HashMap<Subject, Mark> getMarks() {
        return this.marks;
    }

    public float getAverage() {
        int sum = 0;
        for (Mark mark : this.marks.values()) {
            sum += mark.getMark();
        }
        return sum/this.marks.size();
    }

}

class Teacher extends Person {
    private Subject firstSubject;
    private Subject secondSubject;

    public void setFirstSubject(Subject firstSubject) {
        this.firstSubject = firstSubject;
    }

    public void setSecondSubject(Subject secondSubject) {
        this.secondSubject = secondSubject;
    }

    public Subject getFirstSubject() {
        return this.firstSubject;
    }

    public Subject getSecondSubject() {
        return this.secondSubject;
    }
}

class Mark {
    private Subject subjectName;
    private int note;

    public void setSubject(Subject subject) {
        this.subjectName = subject;
    }

    public void setMark(int note) {
        this.note = note;
    }

    public Subject getSubject() {
        return this.subjectName;
    }

    public int getMark() {
        return this.note;
    }
}

class Subject {
    private String name;

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return this.name;
    }
}


public class Main {

    public static void main(String[] args) {
        String[] sbjs = new String[]{"Mathematik", "Informatik", "Englisch", "Deutsch", "Religion",
                                         "Wirtschaftslehre", "Gesellschaftslehre", "Physik", "Sport", "Elektrotechnik"};
        Subject[] subjects = new Subject[sbjs.length];
        for (int i = 0; i < sbjs.length; i++) {
            Subject subject = new Subject();
            subject.setName(sbjs[i]);
            subjects[i] = subject;
        }

        Random rng = new Random();
        String[] names = new String[]{"Detlef", "Angelo", "Matheus", "Martin", "Daniel", "Garry", "Merry"};
        String[] surnames = new String[]{"Jansen", "Schmidt", "Viernes", "Soplica", "Berg", "Beckes", "McQueen"};

        Student[] students = new Student[names.length];
        for (int i = 0; i < names.length; i++) {
            int nr1 = rng.nextInt(names.length);
            int nr2 = rng.nextInt(surnames.length);
            int year = 1990 + rng.nextInt(12);
            int month = rng.nextInt(11);
            int day = 1 + rng.nextInt(29);
            Calendar birthday = Calendar.getInstance();
            birthday.set(year, month, day);
            Student student = new Student();
            student.setName(names[nr1]);
            student.setSurname(surnames[nr2]);
            student.setBirthday(birthday);
            HashMap<Subject, Mark> marks = new HashMap<>();
            for (Subject subject : subjects) {
                int mk = 1 + rng.nextInt(5);
                Mark mark = new Mark();
                mark.setMark(mk);
                mark.setSubject(subject);
                marks.put(subject, mark);
            }
            student.setMarks(marks);
            students[i] = student;
        }

        String[] namess = new String[]{"Angela", "Michael", "Patrik", "Emil"};
        String[] surnamess = new String[]{"Merkel", "Hier", "Smith", "Freitag"};

        Teacher[] teachers = new Teacher[namess.length];
        for (int i = 0; i < namess.length; i++) {
            int nr1 = rng.nextInt(namess.length);
            int nr2 = rng.nextInt(surnamess.length);
            int year = 1960 + rng.nextInt(30);
            int month = rng.nextInt(11);
            int day = 1 + rng.nextInt(29);
            Calendar birthday = Calendar.getInstance();
            birthday.set(year, month, day);
            Teacher teacher = new Teacher();
            teacher.setName(names[nr1]);
            teacher.setSurname(surnames[nr2]);
            teacher.setBirthday(birthday);
            int sub1 = rng.nextInt(subjects.length);
            int sub2 = rng.nextInt(subjects.length);
            teacher.setFirstSubject(subjects[sub1]);
            teacher.setSecondSubject(subjects[sub2]);
            teachers[i] = teacher;
        }

        System.out.println("Students: ");
        System.out.println();
        for (Student student : students) {
            System.out.println("Name: "+student.getName());
            System.out.println("Surname: "+student.getSurname());
            System.out.println("Age: "+student.getAge());
            System.out.println("Marks:");
            for (Mark mark : student.getMarks().values()) {
                System.out.println("\t"+mark.getSubject().getName()+": "+mark.getMark());
            }
            System.out.println("Average: "+student.getAverage());
            System.out.println();
        }

        System.out.println("Teachers: ");
        System.out.println();
        for (Teacher teacher : teachers) {
            System.out.println("Name: "+teacher.getName());
            System.out.println("Surname: "+teacher.getSurname());
            System.out.println("Age: "+teacher.getAge());
            System.out.println("First subject: "+teacher.getFirstSubject().getName());
            System.out.println("Second subject: "+teacher.getSecondSubject().getName());
            System.out.println();
        }

    }
}