package generators;

import components.Nationality;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Random;

public abstract class Person_generator {

    protected static Random random = new Random();

    protected static String generateName() {
        String alphabet = "abcdefghijklmnopqrstuvwxyz";
        StringBuilder nameBuilder = new StringBuilder(random.nextInt(11) + 5);

        for(int i = 0; i < nameBuilder.capacity(); i++) {
            String add = "" + alphabet.charAt(random.nextInt(alphabet.length()));
            if(i == 0) {
                add = add.toUpperCase();
            }
            nameBuilder.append(add);
        }
        return nameBuilder.toString();
    }

    protected static Date generateDate(final int minYear, final int maxYear) {
        Calendar result_cal = new GregorianCalendar();

        int currYear = Calendar.getInstance().get(Calendar.YEAR);

        int result_year = random.nextInt(maxYear - minYear) + currYear - maxYear;
        result_cal.set(Calendar.YEAR, result_year);

        int result_dayOfYear = random.nextInt(result_cal.getActualMaximum(Calendar.DAY_OF_YEAR)) + 1;
        result_cal.set(Calendar.DAY_OF_YEAR, result_dayOfYear);

        return result_cal.getTime();
    }

    protected static Date generateBirthdate() {
        return generateDate(20, 80);
    }

    protected static Nationality generateNationality() {
        return Nationality.values()[random.nextInt(Nationality.values().length)];
    }
}


package generators;

import components.Student;

import java.util.HashSet;
import java.util.Set;

public class Students_generator extends Person_generator {

    public static Set<Student> generateStudents(int num) throws Exception {
        Set<Student> result = new HashSet<>();

        for(int i = 0; i < num; i++) {
            result.add(new Student(generateName(), generateName(), generateBirthdate(), generateNationality(),
                                   generateStudentNum()));
        }
        return result;
    }

    private static int generateStudentNum() {
        return random.nextInt(500000) + 1;
    }
}


package generators;

import components.Teacher;

import java.util.HashSet;
import java.util.Set;

public class Teachers_generator extends Person_generator {

    public static Set<Teacher> generateTeachers(int num) throws Exception {
        Set<Teacher> result = new HashSet<>();

        for(int i = 0; i < num; i++) {
            result.add(new Teacher(generateName(), generateName(), generateNationality(), generateBirthdate(),
                                   generateDegree(), generateDate(0, 30)));
        }
        return result;
    }

    private static Teacher.Degree generateDegree() {
        return Teacher.Degree.values()[random.nextInt(Teacher.Degree.values().length)];
    }

}