[НП] - Контакти

import java.text.DecimalFormat;
import java.util.Scanner;
import java.lang.Enum;

abstract class Contact{
    private String date;

    public Contact(String date){
        this.date=date;
    }
    //da se razgleda ova
    public boolean isNewerThan(Contact c){
        if(this.date.compareTo(c.getDate())>0)
            return true;
        else return false;
    }

    public String getDate(){
        return date;
    }

    public abstract String getType();
}

class EmailContact extends Contact{
    private String email;

    public EmailContact(String date, String email){
        super(date);
        this.email=email;
    }

    public String getEmail() {
        return email;
    }

    @Override
    public String getType() {
        return "Email";
    }
}

class PhoneContact extends Contact{
    private String phoneNumber;
    public enum Operator {VIP, ONE, TMOBILE};

    public PhoneContact(String date, String phoneNumber) {
        super(date);
        this.phoneNumber = phoneNumber;
    }

    public String getPhone() {
        return phoneNumber;
    }
    public Operator getOperator(){
        if(phoneNumber.charAt(2)=='0' || phoneNumber.charAt(2)=='1' || phoneNumber.charAt(2)=='2')
            return Operator.TMOBILE;
        else if(phoneNumber.charAt(2)=='5' || phoneNumber.charAt(2)=='6')
            return Operator.ONE;
        else
            return Operator.VIP;
    }
    @Override
    public String getType() {
        return "Phone";
    }
}

class Student{
    private String firstName;
    private String lastName;
    private String city;
    private int age;
    private long index;
    private Contact[]contacts;
    private int numE;
    private int numP;

    public Student(String firstName, String lastName, String city, int age, long index) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.city = city;
        this.age = age;
        this.index = index;
        numE=numP=0;
        contacts=new Contact[0];
    }

    public void addEmailContact(String date, String email){
        numE++;
        Contact [] tmp=new Contact[contacts.length+1];
        for(int i=0;i<contacts.length;i++){
            tmp[i]=contacts[i];
        }
        tmp[contacts.length]=new EmailContact(date,email);
        contacts=tmp;
    }

    public void addPhoneContact(String date, String phone){
        numP++;
        Contact [] tmp=new Contact[contacts.length+1];
        for(int i=0;i<contacts.length;i++){
            tmp[i]=contacts[i];
        }
        tmp[contacts.length]=new PhoneContact(date,phone);
        contacts=tmp;
    }

    public Contact[] getEmailContacts(){
        Contact [] ec=new Contact[numE];
        int i=0;
        for(Contact c:contacts){
            if(c.getType().equals("Email")){
                ec[i]=c;
                i++;
            }
        }
        return ec;
    }
    public Contact[] getPhoneContacts(){
        Contact [] pc=new Contact[numP];
        int i=0;
        for(Contact c:contacts){
            if(c.getType().equals("Phone")){
                pc[i]=c;
                i++;
            }
        }
        return pc;
    }

    public String getCity() {
        return city;
    }

    public String getFullName(){
        return firstName+" "+lastName;
    }

    public int getNumContacts(){
        return contacts.length;
    }

    public long getIndex() {
        return index;
    }

    public Contact getLatestContact(){
        Contact latest=contacts[0];

        for(int i=1;i<contacts.length;i++){
            if(contacts[i].isNewerThan(latest)){
                latest=contacts[i];
            }
        }
        return latest;
    }

    public String toString(){
        StringBuilder sb=new StringBuilder();
        Contact [] ec=getEmailContacts();
        sb.append("{\"ime\":\""+firstName+"\", \"prezime\":\""+lastName+"\", \"vozrast\":"+age+", \"grad\":\""+city+"\", \"indeks\":"+index+", \"telefonskiKontakti\":[");

        Contact [] emc=getEmailContacts();
        Contact [] phc=getPhoneContacts();
        for(int i=0;i<phc.length;i++){
            PhoneContact ph= (PhoneContact) phc[i];
            if(i==phc.length-1){
                sb.append("\""+ph.getPhone()+"\"");
            }
            else
                sb.append("\""+ph.getPhone()+"\", ");
        }
        sb.append("], \"emailKontakti\":[");
        for(int i=0;i<emc.length;i++){
            EmailContact em= (EmailContact) emc[i];
            if(i==emc.length-1)
                sb.append("\""+em.getEmail()+"\"");
            else
            sb.append("\""+em.getEmail()+"\", ");
        }
            sb.append("]}");
        return sb.toString();
    }
}

class Faculty{
    private String name;
    private Student [] students;

    public Faculty(String name, Student[] students) {
        this.name = name;
        this.students = students;
    }

    public int countStudentsFromCity(String cityName){
        int count=0;
        for(Student s:students){
            if(s.getCity().equals(cityName))
                count++;
        }
        return count;
    }

    public Student getStudent(long index){
        for(Student s:students){
            if(s.getIndex()==index)
                return s;
        }
        return null;
    }

    public double getAverageNumberOfContacts(){
        int sum=0;
        for(Student s:students){
            sum+=s.getNumContacts();
        }
        return (double) sum / students.length;
    }

    public Student getStudentWithMostContacts(){
        Student max=students[0];

        for(int i=1;i<students.length;i++){
            if(students[i].getNumContacts()>max.getNumContacts()){
                max=students[i];
            }
            else if(students[i].getNumContacts()==max.getNumContacts()){
                if(students[i].getIndex()>max.getIndex()){
                    max=students[i];
                }
            }
        }
        return max;
    }

    public String toString(){
        StringBuilder sb=new StringBuilder();
        sb.append("{\"fakultet\":\""+name+"\", \"studenti\":[");
        for(int i=0;i<students.length;i++){
            if(i==students.length-1)
                sb.append(students[i].toString()+"]}");
            else
            sb.append(students[i].toString()+", ");
        }
        return sb.toString();
    }
}
public class ContactsTester {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int tests = scanner.nextInt();
        Faculty faculty = null;

        int rvalue = 0;
        long rindex = -1;

        DecimalFormat df = new DecimalFormat("0.00");

        for (int t = 0; t < tests; t++) {

            rvalue++;
            String operation = scanner.next();

            switch (operation) {
                case "CREATE_FACULTY": {
                    String name = scanner.nextLine().trim();
                    int N = scanner.nextInt();

                    Student[] students = new Student[N];

                    for (int i = 0; i < N; i++) {
                        rvalue++;

                        String firstName = scanner.next();
                        String lastName = scanner.next();
                        String city = scanner.next();
                        int age = scanner.nextInt();
                        long index = scanner.nextLong();

                        if ((rindex == -1) || (rvalue % 13 == 0))
                            rindex = index;

                        Student student = new Student(firstName, lastName, city,
                                age, index);
                        students[i] = student;
                    }

                    faculty = new Faculty(name, students);
                    break;
                }

                case "ADD_EMAIL_CONTACT": {
                    long index = scanner.nextInt();
                    String date = scanner.next();
                    String email = scanner.next();

                    rvalue++;

                    if ((rindex == -1) || (rvalue % 3 == 0))
                        rindex = index;

                    faculty.getStudent(index).addEmailContact(date, email);
                    break;
                }

                case "ADD_PHONE_CONTACT": {
                    long index = scanner.nextInt();
                    String date = scanner.next();
                    String phone = scanner.next();

                    rvalue++;

                    if ((rindex == -1) || (rvalue % 3 == 0))
                        rindex = index;

                    faculty.getStudent(index).addPhoneContact(date, phone);
                    break;
                }

                case "CHECK_SIMPLE": {
                    System.out.println("Average number of contacts: "
                            + df.format(faculty.getAverageNumberOfContacts()));

                    rvalue++;

                    String city = faculty.getStudent(rindex).getCity();
                    System.out.println("Number of students from " + city + ": "
                            + faculty.countStudentsFromCity(city));

                    break;
                }

                case "CHECK_DATES": {

                    rvalue++;

                    System.out.print("Latest contact: ");
                    Contact latestContact = faculty.getStudent(rindex)
                            .getLatestContact();
                    if (latestContact.getType().equals("Email"))
                        System.out.println(((EmailContact) latestContact)
                                .getEmail());
                    if (latestContact.getType().equals("Phone"))
                        System.out.println(((PhoneContact) latestContact)
                                .getPhone()
                                + " ("
                                + ((PhoneContact) latestContact).getOperator().toString() + ")");

                    if (faculty.getStudent(rindex).getEmailContacts().length > 0&&faculty.getStudent(rindex).getPhoneContacts().length > 0) {
                        System.out.print("Number of email and phone contacts: ");
                        System.out
                                .println(faculty.getStudent(rindex)
                                        .getEmailContacts().length
                                        + " "
                                        + faculty.getStudent(rindex)
                                        .getPhoneContacts().length);

                        System.out.print("Comparing dates: ");
                        int posEmail = rvalue
                                % faculty.getStudent(rindex).getEmailContacts().length;
                        int posPhone = rvalue
                                % faculty.getStudent(rindex).getPhoneContacts().length;

                        System.out.println(faculty.getStudent(rindex)
                                .getEmailContacts()[posEmail].isNewerThan(faculty
                                .getStudent(rindex).getPhoneContacts()[posPhone]));
                    }

                    break;
                }

                case "PRINT_FACULTY_METHODS": {
                    System.out.println("Faculty: " + faculty.toString());
                    System.out.println("Student with most contacts: "
                            + faculty.getStudentWithMostContacts().toString());
                    break;
                }

            }

        }

        scanner.close();
    }
}