using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Review_TemperatureConv
{
    class Program
    {
        static void ConvertInchtoCm()
        {
            string inInches;
            double inches = 0;
            double result;

            while (inches == 0)
            {
                Console.WriteLine("Please input measurment to convert to centimentres: ");
                inInches = Console.ReadLine();
                inches = errorChecking(inInches);
            }

            result = inches * 2.54;

            Console.WriteLine("{0} inches is {1} in Centimetres.", inches, result);


        }

        static void ConvertInchtoMm()
        {
            string inInches;
            double inches = 0;
            double result;

            while (inches == 0)
            {
                Console.WriteLine("Please input measurment to convert to milimetres: ");
                inInches = Console.ReadLine();
                inches = errorChecking(inInches);
            }

            result = inches * 25.4;

            Console.WriteLine("{0} inches is {1} in Milimeters.", inches, result);
        }

        static void ConvertInchtoFeet()
        {
            string inInches;
            double inches = 0;
            double result;

            while (inches == 0)
            {
                Console.WriteLine("Please input measurment to convert to Feet: ");
                inInches = Console.ReadLine();
                inches = errorChecking(inInches);
            }

            result = inches * 0.0833333;

            Console.WriteLine("{0:F2} inches is {1:F2} in Foot.", inches, result);
        }

        static void ConvertInchtoM()
        {
            string inInches;
            double inches = 0;
            double result;

            while (inches == 0)
            {
                Console.WriteLine("Please input measurment to convert to Metres: ");
                inInches = Console.ReadLine();
                inches = errorChecking(inInches);
            }

            result = inches * 0.0254;

            Console.WriteLine("{0} inches is {1} in Metres.", inches, result);
        }

        static double errorChecking(string inData)
        {
            double number = 0;

            try
            {
                number = Convert.ToDouble(inData);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }

            return number;
        }

        static int Menu()
        {
            Console.WriteLine("Please select one of the following options by pressing the corresponding number next to it: ");
            Console.WriteLine("1. Convert from Inch to Cm");
            Console.WriteLine("2. Convert from Inch to Mm");
            Console.WriteLine("3. Convert from Inch to Feet");
            Console.WriteLine("4. Convert from Inch to Metres");
            Console.WriteLine("5. Help");
            Console.WriteLine("6. Exit");

            string inData = Console.ReadLine();
            int choice = Convert.ToInt32(errorChecking(inData));

            return choice;
        }
        static void Help()
        {
            Console.WriteLine("To navigate around Menu, you just have to press the number corresponding to the action you want to take." +
            "\nAll the conversions are from Inches to the length available: \n[CM, MM, Feet and Metres]" +
            "\nWhen you are finished just press 6 to exit the program.");
            Console.ReadLine();
        }
        static void Main(string[] args)
        {
            int menuChoice = 0;

            while (menuChoice < 7)
            {
                menuChoice = Menu();

                if (menuChoice == 1)
                {
                    ConvertInchtoCm();
                }
                else if (menuChoice == 2)
                {
                    ConvertInchtoMm();
                }
                else if (menuChoice == 3)
                {
                    ConvertInchtoFeet();
                }
                else if (menuChoice == 4)
                {
                    ConvertInchtoM();
                }
                else if (menuChoice == 5)
                {
                    Help();
                }
                else if (menuChoice == 6)
                {
                    Environment.Exit(0);
                }
                else
                {
                    Console.WriteLine("error");
                    menuChoice = 0;

                }

            }
        }
    }
}