package com.test;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class Main {

    public static void main(String[] args) {

        int userQuantity = 100;

        List<UserData> list = new ArrayList<>();
        Path dir = null;

        for (int i = 0; i < userQuantity; i++) {
            list.add(new UserData("testLogin" + i,
                    "testPass" + i,
                    "FirstNameTest" + i,
                    "LastNameTest" + i));
        }
        try {
            if (Files.notExists(Paths.get("testUsers"))) {
                dir = Files.createDirectory(Paths.get("testUsers"));
            } else {
                dir = Paths.get("testUsers");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        try(BufferedWriter userWriter = new BufferedWriter(new FileWriter("userData.dat"))) {
            userWriter.write("login,password,firstName,lastName,creditCardNumber,creditCardExp");
            userWriter.newLine();
            for (UserData data: list
                 ) {
                if (Files.notExists(Paths.get(dir.toString(), data.getLogin()))) {
                    try (BufferedWriter writer = new BufferedWriter(new FileWriter(new File(dir.toString(), data.getLogin())))) {
                        writer.write(data.getPassword());
                        writer.newLine();
                        writer.write(data.getFirstName() + ";" + data.getLastName());
                        writer.newLine();
                        writer.newLine();
                        writer.newLine();
                        writer.write(";");
                        writer.newLine();
                        writer.write(data.getFirstName() + ";" + data.getLastName());
                        writer.newLine();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }

                userWriter.write(data.getLogin() + "," +
                        data.getPassword() + ',' +
                        data.getFirstName() + "," +
                        data.getLastName() + "," +
                        data.getCardNumber() + "," +
                        data.getCardExpDate());
                userWriter.newLine();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static class UserData {
        private String login;
        private String password;
        private String firstName;
        private String lastName;
        private String cardNumber;
        private String cardExpDate;

        public UserData(String login, String password, String firstName, String lastName) {
            this.login = login;
            this.password = password;
            this.firstName = firstName;
            this.lastName = lastName;
            Random random = new Random();
            StringBuilder s = new StringBuilder();
            for (int i = 0; i < 16; i++) {
                s.append(random.nextInt(10));
            }
            cardNumber = s.toString();
            cardExpDate = String.valueOf(random.nextInt(12) + 1) + "/" +
                    String.valueOf(random.nextInt(7)+ 19);
        }

        public String getLogin() {
            return login;
        }

        public String getPassword() {
            return password;
        }

        public String getFirstName() {
            return firstName;
        }

        public String getLastName() {
            return lastName;
        }

        public String getCardNumber() {
            return cardNumber;
        }

        public String getCardExpDate() {
            return cardExpDate;
        }
    }
}