FreeStyler

package assignment;
import java.util.ArrayList;
import java.util.Scanner;
public class core{
    private static Scanner input;
    private String account;
    private ArrayList<String> username = new ArrayList<String>();
    private ArrayList<String> password = new ArrayList<String>();
    private ArrayList<String> userOrder = new ArrayList<String>();
    private ArrayList<String> shipStatus = new ArrayList<String>();
    private ArrayList<String> orderStatus = new ArrayList<String>();
    private ArrayList<Integer> item1 = new ArrayList<Integer>();
    private ArrayList<Integer> item2 = new ArrayList<Integer>();
    private ArrayList<Integer> item3 = new ArrayList<Integer>();

    public static void main(String[] args) {
        int x = 0;
        boolean bool = true;
        core run = new core();
        //run.readDat();
        input = new Scanner(System.in);
        do{
            switch (x) {

            case 0:
                x = mainMenu();
                break;
            case 1:
                x = run.admin();
                break;
            case 2:
                x = run.user();
                break;
            case 3:
                x = run.userLogin();
                break;
            case 4:
                x = run.userReg();
                break;
            case 5:
                x = run.userMenu();
                break;
            case 6:
                run.userShop();
                bool = false;
                break;
            case 7:
                run.userStatus();
                bool = false;
                break;
            default:
                bool = false;
                System.out.println(x);
                break;
            }
        } while (bool);
    }

    private static int mainMenu(){
        System.out.println("Welcome to FreeStyler Online Apparels");
        System.out.println("Login As:\n(1)Admin\n(2)User");
        boolean bool = true;
        String n;
        do {
            try{
                n = input.nextLine();
            } catch (Exception e) {
                System.out.println("Invalid input, " + e);
                System.out.println("Login As:\n(1)Admin\n(2)User");
                continue;
            }
            if (n.equals("1")){
                bool = false;
                return 1;
            }
            else if (n.equals("2")){
                bool = false;
                return 2;
            }
            else {
                System.out.println("Invalid input, please try again");
                System.out.println("Login As:\n(1)Admin\n(2)User");
                continue;
            }
        }while(bool);
        return 0;
    }
    private int admin(){
        boolean bool = true;
        String user, pass = null;
        do {
            System.out.println("-1 to back");
            System.out.print("Username: ");
            try {
                user = input.nextLine();
            } catch (Exception e){
                System.out.println("Error: " + e);
                continue;
            }
            if (backtrack(user)){
                bool = false;
                return 0;
            }
            System.out.print("Password: ");
            try{
                pass = input.nextLine();
            } catch (Exception e){
                System.out.println("Error: " + e);
            }

            if (backtrack(pass)){
                bool = false;
                return 0;
            }
            else if (user.equals("admin") && pass.equals("admin")){
                System.out.println("Login Successfully");
                bool = false;
                return 10;
            }
            else {
                System.out.println("Invalid username or password");
            }
        }while (bool);
        return 0;
    }

    private int user(){
        String x;
        System.out.println("-1 to back");
        System.out.println("(1)Login\n(2)Register");
        try{
            x = input.nextLine();
        }
        catch (Exception e){
            System.out.println("Invalid input, " + e);
            return 2;
        }

        if (x.equals("1")){
            return 3;
        }
        else if (x.equals("2")){
            return 4;
        }
        else if (x.equals("-1")){
            return 0;
        }
        else {
            System.out.println("Invalid input, please try again");
            return 0;
        }
    }

    private int userLogin(){
        boolean bool = true;
        String user, pass = null;
        loadDat();
        do{
            System.out.println("-1 to back");
            System.out.print("Username: ");
            try {
                user = input.nextLine();
            } catch (Exception e){
                System.out.println("Error: " + e);
                continue;
            }
            if (user.equals("-1")){
                bool = false;
                return 2;
            }
            System.out.print("Password: ");
            try{
                pass = input.nextLine();
            } catch (Exception e){
                System.out.println("Error: " + e);
            }
            if (pass.equals("-1")){
                bool = false;
                return 2;
            }
            else {
                for (int i = 0; i < this.username.size(); i++) {
                    if (user.equals(this.username.get(i)) && pass.equals(this.password.get(i))){
                        System.out.println("Login Successfully");
                        bool = false;
                        account = this.username.get(i);
                        return 5;
                    }
                }
                System.out.println("Invalid username or password");
            }
        }while(bool);
        return 0;
    }

    private int userReg(){
        String user, pass;
        boolean bool = true;
        boolean bool2 = false;
        boolean taken;
        loadDat();
        System.out.println("Register as");

        do{
            taken = false;
            System.out.print("Username: ");
            user = input.nextLine();

            for (int i = 0; i < this.username.size(); i++) {
                if (user.equals(this.username.get(i))){
                    System.out.println("Username taken, please take different username");
                    taken = true;
                    continue;
                }
            }

            if (taken){
                continue;
            }

            else if(user.contains(" ")){
                System.out.println("Username or password cannot contain space");
                continue;
            }

            else {
                do {
                    bool2 = false;
                    System.out.print("Password: ");
                    pass = input.nextLine();
                    if (pass.contains(" ")){
                        System.out.println("Username or password cannot contain space");
                        bool2 = true;
                        continue;
                    }
                    else {
                        addDat(user, pass);
                        System.out.println("Account created successfully");
                        bool = false;
                        return 2;
                    }
                }while(bool2);
            }
        }while(bool);
        return 0;
    }

    private int userMenu(){
        boolean bool = true;
        String x = null;
        System.out.println("Welcome back, " + account);
        do{

            System.out.println("(1)Shop\n(2)Status\n(3)Log Out");
            try {
                x = input.nextLine();
            } catch (Exception e) {
                System.out.println("Invalid input, " + e);
            }
            if (x.equals("1")){
                bool = false;
                return 6;
            }
            else if (x.equals("2")){
                bool = false;
                return 7;
            }
            else if (x.equals("3")){
                bool = false;
                return 0;
            }
            else {
                System.out.println("Invalid input, please try again");
            }
        }while(bool);
        return 0;
    }

    private int userShop(){
        int x = 0;
        int n = 0;
        int item[] = {
            0,
            0,
            0,
        };
        boolean bool, bool2, checkOut;
        do {
            checkOut = true;
            do {
                bool = false;
                System.out.println("Item on sale");
                System.out.println("-1 to back (Clear cart)");
                System.out.println("(1)item1\n(2)item2\n(3)item3\n(4)View item in cart\n(5)Check Out");
                System.out.print("Select an item to purchase: ");
                try {
                    x = Integer.parseInt(input.nextLine());
                }
                catch (Exception e){
                    System.out.println("Invalid input, " + e);
                    bool = true;
                    continue;
                }
                if (backtrack(x)){
                    bool = false;
                    return 5;
                }

                else if (x <= 0 || x >= 6){
                    System.out.println("Invalid input, please try again");
                    bool = true;
                }
                else {
                    break;
                }
            }while(bool);
            if (x > 0 && x < 4){
                do{
                    bool2 = false;
                    System.out.println("-1 to cancel");
                    System.out.print("Quantity: ");
                    try {
                        n = Integer.parseInt(input.nextLine());
                    }
                    catch (Exception e){
                        System.out.println("Invalid input, " + e);
                        bool2 = true;
                        continue;
                    }
                    if(backtrack(x)){
                        bool = false;
                        checkOut = false;
                        return 5;
                    }
                    if(n < 1){
                        System.out.println("Quantity cannot less than 0");
                        bool2 = true;
                        continue;
                    }
                    else {
                        System.out.println("item" + x + " (Amount: " + n + ") added to cart" );
                    }
                }while(bool2);
                item[x] = n;
            }
            else if (x == 4){
                for (int i = 0; i <= 3; i++) {
                    System.out.println("item" + (i + 1) + " (Amount: " + item[i]);
                }
                continue;
            }
            else if (x == 5){
                checkOut = false;
            }
        }while(checkOut);
        return 0;
    }

    private int userStatus(){
        loadOrder();
        for (int i = 0; i < this.userOrder.size(); i++) {
            if (this.userOrder.get(i).equals(account)){
                System.out.println("Order #" + i);
                System.out.println("item1 x " + item1.get(i));
                System.out.println("item2 x " + item2.get(i));
                System.out.println("item3 x " + item2.get(i));
                System.out.println("Order confirm: " + orderStatus.get(i));
                System.out.println("Shipping confirm: " + shipStatus.get(i));
                System.out.println();
            }
        }
        return 0;
    }

    private void loadDat(){
        readWrite read = new readWrite();
        read.openRead("login.txt");
        read.readDat();
        username.clear();
        password.clear();
        for (int i = 0; i < read.user.size(); i++) {
            this.username.add(read.user.get(i));
            this.password.add(read.pass.get(i));
        }
        read.closeRead();
    }


    private void addDat(String user, String pass){
        readWrite write = new readWrite();
        write.openRead("login.txt");
        write.readDat();
        write.closeRead();
        write.user.add(user);
        write.pass.add(pass);
        write.openWrite("login.txt");
        write.writeDat();
        write.closeWrite();
    }

    private void loadOrder(){
        readWrite readOrder = new readWrite();
        readOrder.openRead("order.txt");
        readOrder.readStatus();
        userOrder.clear();
        orderStatus.clear();
        shipStatus.clear();
        item1.clear();
        item2.clear();
        item3.clear();
        for (int i = 0; i < readOrder.userOrder.size(); i++) {
            this.userOrder.add(readOrder.userOrder.get(i));
            this.orderStatus.add(readOrder.orderStatus.get(i));
            this.shipStatus.add(readOrder.shipStatus.get(i));
            this.item1.add(readOrder.item1.get(i));
            this.item2.add(readOrder.item2.get(i));
            this.item3.add(readOrder.item3.get(i));
        }
    }

    private boolean backtrack(String back){
        if (back.equals("-1")){
            return true;
        }
        else {
            return false;
        }
    }

    private boolean backtrack(int back){
        if (back == -1){
            return true;
        }
        else {
            return false;
        }
    }
}