using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace CompareLoadOrder
{
    class Program
    {      
        static void Main(string[] args)
        {

            //get a buffer to return to zero
            Stream s = new MemoryStream();

            //our three files.
            StreamReader alpha= new  StreamReader(@"alpha.txt");
            StreamReader beta= new  StreamReader(@"beta.txt");
            StreamWriter output = new  StreamWriter(@"output.txt");

            //internal listing so we can mess with data
            List<string> alphaList = new List<string>();
            List<string> betaList = new List<string>();
            List<string> outputList = new List<string>();

            //fill alphaList
            for (int i = 0; i < File.ReadLines(@"alpha.txt").Count(); i++)
            {
                string newData = alpha.ReadLine();
                alphaList.Add(newData);
            }

            //fill betaList
            for (int i = 0; i < File.ReadLines(@"beta.txt").Count(); i++)
            {
                string newData = beta.ReadLine();
                betaList.Add(newData);
            }

            //return the readers back to index 0, start of file
            s.Position = 0;
            alpha.DiscardBufferedData();
            beta.DiscardBufferedData();

            //compare the two files. If any matches 100%, save the match to outputList
            for (int i = 0; i < File.ReadLines(@"alpha.txt").Count(); i++)
            {
                for (int j = 0; j < File.ReadLines(@"beta.txt").Count(); j++)
                {
                    if (alphaList[i].Equals(betaList[j]))
                    {
                        outputList.Add(alphaList[i]);
                    }                    
                }
            }

            //write the outputList to a new file.
            for (int i = 0; i < outputList.Count(); i++)
            {
                output.WriteLine(outputList[i]);
            }
        }
    }
}