package org.Exceptions;

import java.util.regex.Pattern;

public class RuntimeExceptionDemo {
    public static void main(String[] args) {

        UserEntity user = new UserEntity("Ali", "Ahmadi", 1234567890L,
                null, 989111111111L, null);

        validateEmail(user);
        calculatePayment(5000, 0);
        convertUserAge("twenty");
        completeRegistration(user);

    }


    //nullPointerException
    //IllegalArgumentException
    public static void validateEmail(UserEntity user) {
        try {
            String email = user.getEmail();

            String emailRegex = "^[A-Za-z0-9+_.-]+@[A-Za-z0-9.-]+$";

            if (!Pattern.matches(emailRegex, email)) {
                throw new IllegalArgumentException("Invalid email format");
            }

            System.out.println("User email is valid");
        } catch (NullPointerException e) {
            System.out.println("Error: email is null - " + e.getMessage());
        } catch (IllegalArgumentException e) {
            System.out.println("Error: " + e.getMessage());
        }
    }

    // ArithmeticException
    public static void calculatePayment(int totalAmount, int installmentCount) {
        try {
            int payment = totalAmount / installmentCount;

            System.out.println("Each installment : " + payment);
        } catch (ArithmeticException e) {
            System.out.println("Error: cannot divide by zero - " + e.getMessage());
        }
    }

    // NumberFormatException
    public static void convertUserAge(String ageInput) {
        try {
            int age = Integer.parseInt(ageInput);

            System.out.println("User age: " + age);
        } catch (NumberFormatException e) {
            System.out.println("Error: invalid number format - " + e.getMessage());
        }
    }

//    IllegalStateException
    public static void completeRegistration(UserEntity user) {
        try {
            if (user.getDateOfBirth() == null) {
                throw new IllegalStateException(
                        "Registration cannot be completed. Date of birth is missing."
                );
            }

            System.out.println("Registration completed");
        } catch (IllegalStateException e) {
            System.out.println("Error: " + e.getMessage());
        }
    }

}