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 DistanceConverterZafar
{
    public partial class Form1 : Form
    {

        public object Messagebox { get; private set; }

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            FromListBox.Items.Add("Inch");
            FromListBox.Items.Add("Feet");
            FromListBox.Items.Add("Yard");


            ToDistanceListBox.Items.Add("Inch");
            ToDistanceListBox.Items.Add("Feet");
            ToDistanceListBox.Items.Add("Yard");

        }

        private void ConvertButton_Click(object sender, EventArgs e)
        {
            {
                int distance, final; //variable to store user input
                string option, option2; //variables to store items from each listbox

                if (int.TryParse(NumberTextBox.Text, out distance)) //to prevent exemption
                {
                    if (FromListBox.SelectedIndex != -1 &&
                    ToDistanceListBox.SelectedIndex != -1)//to prevent exemption for listboxes
                    {
                        option = FromListBox.SelectedItem.ToString();
                        option2 = ToDistanceListBox.SelectedItem.ToString();

                        if (option == "Inches" && option2 == "Inches")
                        {
                            AnswerLabel.Text = distance.ToString();
                        }
                        else if (option == "Inches" && option2 == "Feet")
                        {
                            final = distance / 12;
                            AnswerLabel.Text = final.ToString();
                        }
                        else if (option == "Feet" && option2 == "Feet")
                        {
                            AnswerLabel.Text = distance.ToString();
                        }
                        else if (option == "Feet" && option2 == "Inches")
                        {
                            final = distance * 12;
                            AnswerLabel.Text = final.ToString();
                        }
                    }
                    else
                    {
                        MessageBox.Show("Please select an item from the list");
                    }
                }
                else
                {
                    MessageBox.Show("Please enter a number!");
                }
            }
        }
    }
}