using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace CoffeeShop
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();

            //All dynamic text labels should be blank when the program loads
            resetAllLabels();
        }

        //Resets all labels so they are blank when the program loads
        private void resetAllLabels()
        {
            lblSmallCost.Content = "";
            lblMediumCost.Content = "";
            lblLargeCost.Content = "";

            lblTotalCostValue.Content = "";
            lblTaxValue.Content = "";
            lblGrandTotalValue.Content = "";
        }

        //Set private variables for each coffee size's price
        private double smallCostPerCup = 2.25;
        private double mediumCostPerCup = 3.25;
        private double largeCostPerCup = 4.25;

        //Set private variable for tax rate
        private double tax = .095;

        //These methods handle the check boxes and activate the Quantity controls
        private void chkSmall_Checked(object sender, RoutedEventArgs e)
        {
            txtSmallQuantity.IsEnabled = true;
            txtSmallQuantity.Focus();
        }

        private void chkSmall_Unchecked(object sender, RoutedEventArgs e)
        {
            txtSmallQuantity.IsEnabled = false;
            txtSmallQuantity.Text = "";
            lblSmallCost.Content = "";
            calculateGrandTotal();
        }

        private void chkMedium_Checked(object sender, RoutedEventArgs e)
        {
            txtMediumQuantity.IsEnabled = true;
            txtMediumQuantity.Focus();
        }

        private void chkMedium_Unchecked(object sender, RoutedEventArgs e)
        {
            txtMediumQuantity.IsEnabled = false;
            txtMediumQuantity.Text = "";
            lblMediumCost.Content = "";
            calculateGrandTotal();
        }

        private void chkLarge_Checked(object sender, RoutedEventArgs e)
        {
            txtLargeQuantity.IsEnabled = true;
            txtLargeQuantity.Focus();
        }

        private void chkLarge_Unchecked(object sender, RoutedEventArgs e)
        {
            txtLargeQuantity.IsEnabled = false;
            txtLargeQuantity.Text = "";
            lblLargeCost.Content = "";
            calculateGrandTotal();
        }

        //Calculates cost based on input and creates a string to display
        public string calculateCost(double cost, int quantity)
        {
            double itemCost = cost * Convert.ToDouble(quantity);
            return String.Format("{0:c}", itemCost);
        }

        private void txtSmallQuantity_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (txtSmallQuantity.Text == "")
            {
                lblSmallCost.Content = "";
                calculateGrandTotal();
            }
            else
            {
                try
                {
                    int quantity = Convert.ToInt32(txtSmallQuantity.Text);
                    lblSmallCost.Content = calculateCost(smallCostPerCup, quantity);
                    calculateGrandTotal();
                }
                catch
                {
                    lblSmallCost.Content = "";
                    calculateGrandTotal();
                }
            }
        }

        private void txtMediumQuantity_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (txtMediumQuantity.Text == "")
            {
                lblMediumCost.Content = "";
                calculateGrandTotal();
            }
            else
            {
                try
                {
                    int quantity = Convert.ToInt32(txtMediumQuantity.Text);
                    lblMediumCost.Content = calculateCost(mediumCostPerCup, quantity);
                    calculateGrandTotal();
                }
                catch
                {
                    lblMediumCost.Content = "";
                    calculateGrandTotal();
                }
            }
        }

        private void txtLargeQuantity_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (txtLargeQuantity.Text == "")
            {
                lblLargeCost.Content = "";
                calculateGrandTotal();
            }
            else
            {
                try
                {
                    int quantity = Convert.ToInt32(txtLargeQuantity.Text);
                    lblLargeCost.Content = calculateCost(largeCostPerCup, quantity);
                    calculateGrandTotal();
                }
                catch
                {
                    lblLargeCost.Content = "";
                    calculateGrandTotal();
                }
            }
        }

        //Calculate the total, tax, and grand total for display
        private void calculateGrandTotal()
        {
            //Initialize variables to hold cost numbers for calculation
            double smallCost;
            double mediumCost;
            double largeCost;

            //If there is no quantity entered set cost to 0
            if (lblSmallCost.Content.ToString() == "")
                smallCost = 0;
            else
                smallCost = Convert.ToInt32(txtSmallQuantity.Text) * smallCostPerCup;

            if (lblMediumCost.Content.ToString() == "")
                mediumCost = 0;
            else
                mediumCost = Convert.ToInt32(txtMediumQuantity.Text) * mediumCostPerCup;

            if (lblLargeCost.Content.ToString() == "")
                largeCost = 0;
            else
                largeCost = Convert.ToInt32(txtLargeQuantity.Text) * largeCostPerCup;

            //Display total cost, remove the label if total cost is $0
            double totalCost = smallCost + mediumCost + largeCost;
            if (totalCost == 0)
                lblTotalCostValue.Content = "";
            else
                lblTotalCostValue.Content = String.Format("{0:c}", totalCost);

            //Display tax cost and rate and remove label if total cost is $0
            string taxDisplay = String.Format("{0:c}", (totalCost * tax)) + " (" + Convert.ToString(tax * 100) + "%)";
            if (totalCost == 0)
                lblTaxValue.Content = "";
            else
                lblTaxValue.Content = taxDisplay;

            //Display the grand total and remove label is total cost is $0
            double grandTotal = (totalCost * tax) + totalCost;
            if (totalCost == 0)
                lblGrandTotalValue.Content = "";
            else
                lblGrandTotalValue.Content = String.Format("{0:c}", grandTotal);
        }
    }
}