ManagerState.java

package com.company;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.*;
import java.text.*;
import java.io.*;
import javax.swing.*;

public class ManagerState extends WareState {

    private BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
    private WareContext context;
    private static ManagerState instance;
    private ClientList clientList;
    private ProductList productList;
    private SupplierList supplierList;
    //manager specific calls
    private static final int EXIT = 0;
    private static final int ADD_PRODUCT = 1;
    private static final int ADD_SUPPLIER = 2;
    private static final int SHOW_SUPPLIER_LIST = 3;
    private static final int SHOW_SUPPLIER_PRODUCTS = 4;
    private static final int SHOW_PRODUCT_SUPPLIERS = 5;
    private static final int UPDATE_PRODUCT_PRICE = 6;
    private static final int SALES_MENU = 7;
    private static final int HELP = 8;
    private JFrame frame;
    private LogoutButton logoutButton = new LogoutButton();
    private ClerkButton clerkButton = new ClerkButton();

    private ManagerState() {
        super();
        supplierList = SupplierList.instance();
        productList = ProductList.instance();
        clientList = ClientList.instance();
        //context = WareContext.instance();
        ((LogoutButton) logoutButton).setListener();
    }

    public static ManagerState instance() {
        if (instance == null) {
            instance = new ManagerState();
        }
        return instance;
    }

    public String getToken(String prompt) {
        do {
            try {
                System.out.println(prompt);
                String line = reader.readLine();
                StringTokenizer tokenizer = new StringTokenizer(line, "\n\r\f");
                if (tokenizer.hasMoreTokens()) {
                    return tokenizer.nextToken();
                }
            } catch (IOException ioe) {
                System.exit(0);
            }
        } while (true);
    }

    public int getCommand() {
        do {
            try {
                int value = Integer.parseInt(getToken("Enter command:" + HELP + " for help"));
                if (value >= EXIT && value <= HELP) {
                    return value;
                }
            } catch (NumberFormatException nfe) {
                System.out.println("Enter a number");
            }
        } while (true);
    }

    public void addProduct() {
        boolean successful;
        String productName = getToken("Enter the product name: ");
        int productQuantity = Integer.parseInt(getToken("Enter the product quantity: "));
        int productPrice = Integer.parseInt(getToken("Enter the product price: "));
        Product newProduct = new Product(productName, productQuantity, productPrice);
        successful = productList.insertProduct(newProduct);

        if (successful) {
            System.out.println("Product with details (" + newProduct.toString() + ") added successfully");
        } else {
            System.out.println("Issue adding product!");
        }
    }

    public void addSupplier() {
        boolean successful;
        String supplierName = getToken("Enter the supplier name:");

        Supplier newSupplier = new Supplier(supplierName);

        successful = supplierList.insertSupplier(newSupplier);
        if (successful) {
            System.out.println("Supplier with name " + newSupplier.getName() + " and ID " + newSupplier.get_ID() + " added successfully");
        } else {
            System.out.println("Issue adding supplier!");
        }
    }

    public void showSupplierList() {
        Iterator<Supplier> S_Iterator = supplierList.getSuppliers();
        System.out.println("Printing Supplier List");
        while (S_Iterator.hasNext()) {
            Supplier item = S_Iterator.next();
            System.out.println("ID: " + item.get_ID() + " Name: " + item.getName());
        }
    }

    public void showSuppliersProduct() {
        int productID = Integer.parseInt(getToken("Enter the product ID you wish to suppliers of: "));
        Iterator<Supplier> S_Iterator = supplierList.getSuppliers();
        System.out.println("Printing All Suppliers of that Product");
        while (S_Iterator.hasNext()) {
            Supplier item = S_Iterator.next();
            Iterator<Supply> productSup = item.shipment();
            while (productSup.hasNext()) {
                Supply itemTwo = productSup.next();
                if (productID == itemTwo.get_ID()) {
                    System.out.println("ID: " + item.get_ID() + " Name: " + item.getName());
                }
            }
        }
    }

    public void showProductSuppliers() {
        int supplierID = Integer.parseInt(getToken("Enter the ID of the supplier to get list of products"));
        int position1 = supplierList.IDcheck(supplierID);
        Supplier item = supplierList.get_listed_obj(position1);
        item.print_list();
    }


    public void updatePrice() {

        int supplierID = Integer.parseInt(getToken("Enter the ID of the supplier to get list of products"));
        int position1 = supplierList.IDcheck(supplierID);
        Supplier item = supplierList.get_listed_obj(position1);
        item.print_list();
        int id = Integer.parseInt(getToken("ID of product to add, delete or edit"));
        int IDcheck = productList.IDcheck(id);
        if (IDcheck == -1) {
            System.out.println("No product with that ID");
        } else {
            String choice = getToken("INSERT, REMOVE, or CHANGE?");
            switch (choice) {
                case "INSERT":
                    String nameP = getToken("enter the product name");
                    String price_info = getToken("enter the product price information");
                    double price = Double.parseDouble(getToken("enter the product price"));
                    item.create_item(price, id, nameP, price_info);
                    break;
                case "REMOVE":
                    item.delete_item(id);
                    break;
                case "CHANGE":
                    item.grab_item(id);
                    break;
                default:
                    System.out.println("no action chosen, none taken");
            }
        }
    }


    private void salesMenu() {
        LoginState.instance().clear();
        (WareContext.instance()).changeState(2); //go to clerk state
    }

    private void help() {
        System.out.println("Enter a number between " + EXIT + " and " + HELP + " as explained below:");

        System.out.println(ADD_PRODUCT + ": to add a product");
        System.out.println(ADD_SUPPLIER + ": to add Supplier");
        System.out.println(SHOW_SUPPLIER_LIST + ": to show supplier list");
        System.out.println(SHOW_SUPPLIER_PRODUCTS + ": to display supplier of a product");
        System.out.println(SHOW_PRODUCT_SUPPLIERS + ": to display product supplied by the supplier ");
        System.out.println(UPDATE_PRODUCT_PRICE + ": to update product and price");
        System.out.println(SALES_MENU + ": to switch to the Sales Clerk menu");
        System.out.println(HELP + ": for help");
        System.out.println(EXIT + ": to Exit\n");
    }

    public void logout() {
        LoginState.instance().clear();
        (WareContext.instance()).changeState(0); // exit
    }

   // @Override
   // public void actionPerformed(ActionEvent e) {
    //    if (event.getSourcce().equals(this.addProductButton))
    //        AddProduct();
   // }


    public void process() {
        boolean done = false;

        int command;
        help();
        while (!done)  {
            switch (getCommand()) {

                case ADD_PRODUCT: addProduct();
                    break;
                case ADD_SUPPLIER: addSupplier();
                    break;
                case SHOW_SUPPLIER_LIST: showSupplierList();
                    break;
                case SHOW_SUPPLIER_PRODUCTS: showSuppliersProduct();
                    break;
                case SHOW_PRODUCT_SUPPLIERS: showProductSuppliers();
                    break;
                case UPDATE_PRODUCT_PRICE: updatePrice();
                    break;
                case SALES_MENU: salesMenu();
                    done = true;
                    break;
                case HELP: help();
                    break;
                case EXIT: done = true;
            }
        }



        logout();



    }
/*
        int command;
        help();
        while ((command = getCommand()) != EXIT) {
            switch (command) {

                case ADD_PRODUCT: addProduct();
                    break;
                case ADD_SUPPLIER: addSupplier();
                    break;
                case SHOW_SUPPLIER_LIST: showSupplierList();
                    break;
                case SHOW_SUPPLIER_PRODUCTS: showSuppliersProduct();
                    break;
                case SHOW_PRODUCT_SUPPLIERS: showProductSuppliers();
                    break;
                case UPDATE_PRODUCT_PRICE: updatePrice();
                    break;
                case SALES_MENU: salesMenu();
                    break;
                case HELP: help();
                    break;
            }
        }



        logout();

 */


    public void run() {
        process();
    }

}