//Santi Vallejo

//12-12-17

//ECPI Midterm

using System;

public class Invoice

{

    //auto-implemented properties

    public string partNumber { get; set; }

    public string partDescrip { get; set; }

    public int quantity = 0;

    public decimal pricePerItem = 0M;

    //constructor initializes properties

    public Invoice(string number, string descrip)

    {

        partNumber = number; //set partNumber to number

        partDescrip = descrip; //set partDescrip to descrip

    } //end constructor

    //displays message

    public void DisplayMessage()

    {   

        //prompts user for quantity

        Console.Write("Enter quantity: ");

        //read quantity

        quantity = Convert.ToInt32(Console.ReadLine());

        //if user enters negative number

        if(quantity < 0)

            quantity = 0;

        //prompts user for item price

        Console.Write("\nEnter price of item: ");

        //read price

        pricePerItem = Convert.ToDecimal(Console.ReadLine());

        //if user enters negative number

        if(pricePerItem < 0M)

            pricePerItem = 0M;

    } //end DisplayMessage method

    //calculates the invoice amount

    public decimal GetInvoiceAmount()

    {

        //declares invoiceAmt variable

        decimal invoiceAmt;

        //multiple quantity by pricePerItem

        invoiceAmt = quantity * pricePerItem;

        //returns invoiceAmt

        return invoiceAmt;

    } //end GetInvoiceAmount method

    public static void Main(string[]args)

    {

        //create Invoice object invoice

        //pass part number and part description to constructor

        Invoice invoice = new Invoice("NumberTwo", "fast");

        //displays prompt messages

        invoice.DisplayMessage();

        //sets invoiceAmount

        decimal invoiceAmount = invoice.GetInvoiceAmount();

        //Displays total amounts

        Console.WriteLine("\nPart Number: {0}\nPart Description: {1}\nQuantity: {2}\nPrice: ${3}", invoice.partNumber, invoice.partDescrip, invoice.quantity, invoice.pricePerItem);

        Console.WriteLine("Invoice Amount: ${0}", invoiceAmount);

    } //end Main method

} //end Invoice class