using System;

public class Program

{

    public static void Main()

    {       

        string i = ""; string f = "";

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = ""; f = null;

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = null; f = null;

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = null; f = "";

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = "English"; f = "English";       

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = "EN"; f = "English";        

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = "EN"; f = "English - American";

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = "EN"; f = "English - UK";

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = "SP"; f = "English - American";

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = "SP"; f = "English";

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = "FR"; f = "English - American";

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = "SP"; f = "Spanish";

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = "FR"; f = "Spanish";

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = "French"; f = "Spanish";

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = "French"; f = "Hindi";

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = "SP"; f = "English - American";

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

        i = "FR"; f = "English - American";

        Console.WriteLine("{0} : {1} => {2}", i, f, ResolveLanguagePref(i, f));

    }

    private static string ResolveLanguagePref(string inputLangPref, string factorLangPref)

    {

        //set defaults on absense of values

        inputLangPref = String.IsNullOrWhiteSpace(inputLangPref) ? "English" : inputLangPref;

        factorLangPref = String.IsNullOrWhiteSpace(factorLangPref) ? "English" : factorLangPref;

        //translate values from known values. Mapping values would need to be hard-coded for now.

        switch (inputLangPref.ToUpper())

        {

            case "EN":

            {

                inputLangPref = "English";

                break;

            }

            case "SP":

            {

                inputLangPref = "Spanish";

                break;

            }

            //if value is not recognized, continue with existing abbreviated value

        }

        //handles values like 'English - American' that would imply 'English'

        if (factorLangPref.ToUpper().Contains("ENGLISH"))

        {

            factorLangPref = "English";

        }

        //per Brad's suggestion:

        //  if one of the values is non-English, we select the non-English value

        //  if both are non-English values, we select the contact factor value

        //  if both are English, English will automatically be selected

        if (factorLangPref != "English") return factorLangPref;

        else return inputLangPref;

    }

}