// Programmer: Janet Joy
// A program to calculate price of meal at a buffet restaurant.
// Uses 2 groups of radio buttons to select meal and age group.
// A check box is checked if the customer has a $1 off coupon.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Buffet
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void radBreakfast_CheckedChanged(object sender, EventArgs e)
        {
            calculatePrice();
        }
        private void calculatePrice()
        {
            // Breafast is $10, lunch $14 and dinner is $18.
            double basePrice;
            if (radBreakfast.Checked) basePrice = 10;
            else if (radLunch.Checked) basePrice = 14;
            else basePrice = 18;

            // Children pay half price.
            if (radChild.Checked) basePrice = basePrice * 0.5;
            // Seniors get a 20% discount, thus they pay 80%
            if (radSenior.Checked) basePrice = basePrice * 0.8;

            // If they have a coupon they get $1 off.
            if (chkCoupon.Checked) basePrice -= 1;
            // Price is displayed to 2 decimal places.
            lblPrice.Text = basePrice.ToString("$0.00");

        }

        private void radLunch_CheckedChanged(object sender, EventArgs e)
        {
            calculatePrice();
        }

        private void radDinner_CheckedChanged(object sender, EventArgs e)
        {
            calculatePrice();
        }

        private void chkCoupon_CheckedChanged(object sender, EventArgs e)
        {
            calculatePrice();
        }

        private void radChild_CheckedChanged(object sender, EventArgs e)
        {
            calculatePrice();
        }

        private void radAdult_CheckedChanged(object sender, EventArgs e)
        {
            calculatePrice();
        }

        private void radSenior_CheckedChanged(object sender, EventArgs e)
        {
            calculatePrice();
        }
    }
}