// Chapter 5 Exception Handlers
// page 70 and 71 Read and Write Streams
// page 43 try catch finally block
// inner Class
// write to a csv file

import java.io.FileWriter;  // page 70
import java.io.IOException; // file is not found or other file issues cpt 5
import java.io.PrintWriter; // page 71
import java.util.Scanner; // ask the user to input quantity

public class Orders {

    public static void main(String[] args) {

        try {

        // Front end order system for the user
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter the quantity of products to order: ");

        int quantity = scanner.nextInt(); // validation or exceptions

        // Product to add to cart
        String sku = "sku0001"; // sku0001
        double price = 52.52;

        // Tax Rate for addToCart
        double taxRate = 0.07; // 7%

        // subTotal of Order
        double subTotal = quantity * price;

        // pass the subTotal and the taxRate to the addToCart()
        // addToCart will do the calculations
        AddToCart addToCart = new AddToCart(sku, subTotal, taxRate);
        addToCart.calculateTotal();  // local var NOT Class name
        System.out.println("Sku: " + addToCart.getSku());
        System.out.println("Price: " + price);
        System.out.println("Quantity: " + quantity);
        System.out.println("Subtotal: " + addToCart.getSubTotal());
        System.out.println("Tax Amount: " + addToCart.getTax());
        System.out.println("Cart Total: " + addToCart.getTotal());

        // Write the order to our orders.csv

            String fileName = "orders.csv"; // "c:/dir/subdir/file.csv"
            PrintWriter printWriter = new PrintWriter(new FileWriter(fileName, true));

            // string to write to the csv file
            printWriter.println(addToCart.getSubTotal() + "," +  addToCart.getTax() + "," +  addToCart.getTotal());
            printWriter.close();
            System.out.println("Order added to " + fileName);

            // close any open streams in try
            scanner.close();

        } // try

        // detailed errors first
        catch (NullPointerException err) {
            System.err.println("Bad data entered.");
        }

        catch (IOException err) {
            System.err.println("Error when writing to file: " + err.getMessage());
            // user or system specific operations on the error
        }

        // last catch a general catch all
        catch (Exception err) {
            System.err.println("General Exception Error Thrown: " + err.getMessage());
        }

        finally {
            // close all open streams, database connection, query or other cleanup actions in application

        }





    } // main()

} // Main Class

class AddToCart {
    private String sku;
    private double subTotal;
    private double taxRate;
    private double tax;
    private double total;

    public AddToCart(String sku, double subTotal, double taxRate) {
        this.sku = sku;
        this.subTotal = subTotal;
        this.taxRate = taxRate;
    } // AddToCart()

    public void calculateTotal() {
        tax = subTotal * taxRate;  // amount of tax
        total = subTotal + tax; // add the subtotal and the tax amount
    }

    // getters

    public String getSku() {
        return sku;
    }

    public double getSubTotal() {
        return subTotal;
    }

    public double getTax() {
        return tax;
    }

    public double getTotal() {
        return total;
    }

} // AddToCart Class