import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class Person {
    private String firstname;
    private String lastname;
    private int age;
    private String date;

    SimpleDateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy");

    public Person() {
        firstname = "";
        lastname = "";
        age = 0;
        date = "";
    }

    public boolean validateFirstName(String name) {
        if (name.equals("") || name.equals(null) || name.length() < 2) {
            return false;
        } else {
            if (validateFirstNameFormat(name)) {
                return true;
            } else {
                return false;
            }
        }
    }

    public String formatFirstName(String s) {
        return s.substring(0, 1).toUpperCase() + s.substring(1).toLowerCase();
    }

    public boolean validateFirstNameFormat(String s) {
        for (int i = 0; i < s.length() - 1; i++) {
            if (!Character.isLetter(s.charAt(i))) {
                return false;
            }
        }
        return true;
    }

    public boolean validateLastName(String name) {
        if (name.equals("") || name.equals(null) || name.length() < 2) {
            return false;
        } else {
            if (validateLastNameFormat(name)) {
                return true;
            } else {
                return false;
            }
        }
    }

    public String formatLastName(String s) {
        int position = -1;
        for (int i = 0; i < s.length() - 1; i++) {
            if (s.charAt(i) == '-') {
                position = i;
                break;
            }
        }
        if (position != -1) {
            return s.substring(0, 1).toUpperCase() + s.substring(1, position).toLowerCase() + "-"
                    + s.substring(position + 1, position + 2).toUpperCase() + s.substring(position + 2).toLowerCase();
        } else {
            return s.substring(0, 1).toUpperCase() + s.substring(1).toLowerCase();
        }
    }

    public boolean validateLastNameFormat(String s) {
        int counter = 0;
        int position = -1;
        for (int i = 0; i < s.length(); i++) {
            if (s.charAt(i) == '-') {
                counter++;
                position = i;
            }
        }
        if (counter == 0) {
            for (int i = 0; i < s.length(); i++) {
                if (!Character.isLetter(s.charAt(i))) {
                    return false;
                }
            }
            return true;
        } else if (counter == 1 && position != 0 && position != s.length() - 1) {
            for (int i = 0; i < s.length(); i++) {
                if (!Character.isLetter(s.charAt(i)) && i != position) {
                    return false;
                }
            }
            return true;
        } else {
            return false;
        }

    }

    public boolean validateAge(String s) throws NumberFormatException {
        try {
            if (Integer.parseInt(s) <= 0) {
                return false;
            } else {
                return true;
            }
        } catch (NumberFormatException e) {
            return false;
        }
    }

    public boolean validateBirthdayDate(String s) {

        try {
            dateFormat.setLenient(false);
            dateFormat.parse(s);
            return true;
        } catch (ParseException e) {
            return false;
        }
    }

    public boolean validateAgeAndBirthdayDate() throws ParseException {
        if (date != null) {
            try {
                Date birthdayDate = dateFormat.parse(date);
                if (age != getAges(birthdayDate)) {
                    return false;
                } else {
                    return true;
                }
            } catch (ParseException e) {
                return false;
            }
        } else {
            return false;
        }
    }

    private static int getAges(Date birthdayDate) {
        Date todayDate = new Date();
        Calendar birthdayCal = Calendar.getInstance();
        birthdayCal.setTime(birthdayDate);
        Calendar todayCal = Calendar.getInstance();
        todayCal.setTime(todayDate);
        int difference = todayCal.get(Calendar.YEAR) - birthdayCal.get(Calendar.YEAR);
        if (birthdayCal.get(Calendar.MONTH) > todayCal.get(Calendar.MONTH)
                || (birthdayCal.get(Calendar.MONTH) == todayCal.get(Calendar.MONTH)
                        && birthdayCal.get(Calendar.DAY_OF_MONTH) > todayCal.get(Calendar.DAY_OF_MONTH))) {
            difference--;
        }
        return difference;
    }

    public String getFirstname() {
        return firstname;
    }

    public void setFirstname(String firstname) {
        this.firstname = formatFirstName(firstname);
    }

    public String getLastname() {
        return lastname;
    }

    public void setLastname(String lastname) {
        this.lastname = formatLastName(lastname);
    }

    public int getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = Integer.parseInt(age);
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) throws ParseException {
        this.date = dateFormat.format(dateFormat.parse(date));
    }
}