Manager

/**
 * SEF Supermarket System
 * Student 1 : Michael Mansour s3509599
 * Student 2 :
 * Student 3 :
 * Student 4 : Zixi Zhang s3459799
 */
package Manager;

import java.io.*;
import java.util.*;
import Sales.*;
import Utilities.*;

/**
 * @author Student :
 *
 */
public class Manager {

    private static PrintStream out = System.out;
    private BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
    private List<product> prod_info = new ArrayList<product>();
    private static final String username = "manager";
    private static final String password = "12345678";

    private static int reorder_quantity;

    public Manager() throws FileNotFoundException, ClassNotFoundException, IOException{

        if(Login.login(username, password)){
            loadItemInfo.loaditemInfo((ArrayList<product>) prod_info, "Product_info.tmp");
            managerMenu();

        }else
            out.println("\nusername or password incorrect!");

        saveItemInfo.saveiteminfo(prod_info, "Product_info.tmp");
    }

    /**
     * Manager Menu
     */
    private void managerMenu() throws IOException, ClassNotFoundException{

        int selection;

        do{
            out.println("1. Maintains unit-price, stock level, replenish-level");
            out.println("2. Supplier details for all products");
            out.println("3. Special discounts on products");
            out.println("4. Generate sales report");
            out.println("5. The most revenue product");
            out.println("6. Exit to main menu");
            out.println("Enter a number");

            selection = InputValidation.ValidateInt(bf.readLine());

            if (selection == 1){
                reorder_quantity = reorder_quant_imple();
                out.println("\nReorder quantity for all item is: " + reorder_quantity);
                out.println();
                Unit_Price_StockLevel();
            }
            else if (selection == 2){
                //Not implement yet
            }
            else if (selection == 3){
                ChangeDiscountStatus();
            }
            else if (selection == 4){
                //Bonus function will be implemented later
                PrintPNGReport();
            }
            else if (selection == 5){
                Mst_Revenue_Product();
            }


        }while(selection != 6);

    }

    /**
     * Specify reorder quantity for all items
     * This method is used the in first function
     * of the Menu
     */
    private int reorder_quant_imple() throws IOException{

        int re_quantity = 50;

        out.println("*** Do you want to change reorder quantity?(y/n)");

        String s = bf.readLine();

        if(s.charAt(0) == 'y' || s.charAt(0) == 'Y'){
            out.print("Please enter new quantity: ");
            return InputValidation.ValidateInt(bf.readLine());
        }
        return re_quantity;
    }

    /**
     * First Menu implementation
     */
    private void Unit_Price_StockLevel() throws IOException{

        PrintList();
        out.println("Please select a number to change info: ");
        int select = InputValidation.ValidateInt(bf.readLine()) -1;

        float unit_Price;
        int quantity;
        @SuppressWarnings("unused")
        int replenish_level;

        try{
            product po = prod_info.get(select);

            if(po.getStockLevel() <= reorder_quantity){
                out.println("StockLevel is too low, reorder item procedure is commencing");
                quantity = reorder_quantity;
            }

            out.println("    Item Info    ");
            out.println("Name: " + po.getName() + " ID: " + po.getID() + " Unit-Price: " + po.getPrice()
                + " Quantity: " + po.getStockLevel());
            out.println("Enter new unit price: ");
            unit_Price = InputValidation.ValidateFloat(bf.readLine());

            out.println("Enter new StockLevel: ");
            quantity = InputValidation.ValidateInt(bf.readLine());

            if(quantity < reorder_quantity){
                quantity = reorder_quantity;
                out.println("StockLevel is low, set to reorder quantity");
            }

            out.println("Enter new Replenish Level: ");
            replenish_level = InputValidation.ValidateInt(bf.readLine());

            po = new product(po.getID(), po.getName(), unit_Price, po.getWeight(), quantity,
                    po.getDiscount(), po.getminitemforDiscount());
            prod_info.set(select, po);

        }catch(IndexOutOfBoundsException ibe){
            out.println("No. invalid!");
        }

    }

    /**
     * Third Menu implementation
     */
    private void ChangeDiscountStatus() throws IOException {
        // TODO Auto-generated method stub
        int i = 1;
        for(product p : prod_info){
            out.println(i + " name : "+p.getName() + " ID: " + p.getID() + " discount: " + (int)(p.getDiscount()*100)+"%" +
                    " Min items quantity for discount : " + p.getminitemforDiscount());
            i++;
        }
        out.println("Please select an item : ");
        int select = InputValidation.ValidateInt(bf.readLine()) - 1;

        try{
            product po = prod_info.get(select);
            out.println("Please specify discount amount(%) : ");
            float dis = InputValidation.ValidateFloat(bf.readLine());
            if(dis > 1f)
                dis = dis/100f;
            out.println("Discount : " + (int)(dis*100)+"%");
            out.println("Please specify quantity for discount item : ");
            int quan = InputValidation.ValidateInt(bf.readLine());

            po = new product(po.getID(), po.getName(), po.getPrice(), po.getWeight(), po.getStockLevel(),
                    dis, quan);
            prod_info.set(select, po);
        }catch(IndexOutOfBoundsException ibe){
            out.println("No. invalid!");
        }

        Iterator<product> itr = prod_info.iterator();
        while(itr.hasNext()){
            product el = (product) itr.next();
            out.println("name : "+el.getName() + " ID: " + el.getID() + " discount: " + el.getDiscount() +
                    " Min items quantity for discount : " + el.getminitemforDiscount());
        }

    }

    /**
     * Fifth Menu implementation
     */
    private void Mst_Revenue_Product() throws FileNotFoundException, ClassNotFoundException, IOException {
        // TODO Auto-generated method stub
        List<transaction_info> t_i = new ArrayList<transaction_info>();
        List<product> p_i = new ArrayList<product>();
        p_i = prod_info;

        ArrayList<Integer> tmp = new ArrayList<Integer>(Collections.nCopies(p_i.size(), 0));
        loadItemInfo.loadtransactionInfo((ArrayList<transaction_info>) t_i, "transaction_info.tmp");

        //Count All item Transaction quantity
        for(transaction_info t : t_i){
            for(Cart c : t.get_Cart()){
                int j = 0;
                for(product p : p_i){
                    int amt_count = 0;
                    if(p.getID().equals(c.getID()))
                        amt_count += c.getQuantity();
                    tmp.set(j, tmp.get(j) + amt_count);
                    j++;
                }
            }
        }

        int index = FindMaxIndex(tmp);
        if(index == -1)
            throw new IOException();

        out.println("######### Revenue Status #########");
        out.println("*** Most revenue product : " + p_i.get(index).getName());
        out.println("*** Product ID : " + p_i.get(index).getID());
        out.println("*** Sales Amount : " + tmp.get(index));
        out.println("##################################");
    }

    /**
     * Generate PNG file using Java.awt and Javax.imageIO GUI in another class
     * @throws IOException
     * @throws ClassNotFoundException
     * @throws FileNotFoundException
     */
    private void PrintPNGReport() throws IOException, ClassNotFoundException {
        // TODO Auto-generated method stub
        List<String> report = new ArrayList<String>();

        ArrayList<transaction_info> trans_info = new ArrayList<transaction_info>();
        loadItemInfo.loadtransactionInfo(trans_info, "transaction_info.tmp");

        report.add(new String("###### Report ######"));

        //Add new line
        report.add(new String(""));

        int i = 1;
        for(transaction_info t_i : trans_info){
            report.add(new String("###### Transaction " + Integer.toString(i) + " ######"));
            report.add(new String("Customer ID : " + t_i.get_customerid()));
            report.add(new String("Card Number : " + t_i.get_CardNum()));
            report.add(new String(""));
            report.add(new String("###### Detail ######"));
            report.add(new String(""));
            for(Cart c : t_i.get_Cart()){
                report.add(new String("Item ID : " + c.getID()));
                report.add(new String("Quantity : " + c.getQuantity()));
                report.add(new String(""));
            }
            i++;
        }
        report.add(new String(""));
        report.add(new String("###### End of Report ######"));

        out.println("Generating PNG file......");

        GenPNGReport.PNG_gen((ArrayList<String>) report);

        out.println("Generation is finished\n");
    }

    /**
     * This method is used for find most revenue product in transaction list
     */
    private int FindMaxIndex(List<Integer> al){
        int index = -1;

        int Max = Collections.max(al);

        while(true){
            if(al.contains(Max)){
                index = al.indexOf(Max);
                break;
            }
        }

        return index;
    }

    private void PrintList(){
        int i = 1;
        for(product p : prod_info){
            System.out.println(i + " ID: " + p.getID() + " name: " + p.getName() + " price: " +
                    p.getPrice() + " quantity: " + p.getStockLevel());
            i++;
        }
    }
}