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

namespace ConsoleApplication19
{
    class Program
    {
        public static Random ran = new Random();
        private static readonly char[] alphaNum = "qwertyuiopasdfghjklzxcvbnm1234567890QWERTYUIOPASDFGHJKLZXCVBNM".ToCharArray();
        private const int MAX_LENGTH = 50;
        private const int SPACE_CHANCE = 6;
        private const string JAVA_EXE = "c:\\Program Files\\Java\\jre6\\bin\\java.exe";
        private const string WORK_DIR = "D:\\src\\csc349\\lab5\\";

        static void Main(string[] args)
        {
            while (true)
            {
                string source = getRandomWord();
                string target = getRandomWord();

                var myStart = new ProcessStartInfo(JAVA_EXE, string.Format("-cp out\\production\\csc349lab5 -ea EditDistance"));
                var goodStart = new ProcessStartInfo(JAVA_EXE, string.Format("-cp GivenEditDistance.jar -ea EditDistance"));

                var outTask = getOutput(myStart, source, target);
                var goodTask = getOutput(goodStart, source, target);

                var myOut = outTask.Result;
                var goodOut = goodTask.Result;

                if (!linewiseEqual(myOut, goodOut))
                {
                    Console.WriteLine();
                    Console.WriteLine(source);
                    Console.WriteLine(target);
                }
                else
                {
                    Console.Write(".");
                }
            }
        }

        readonly static char[] newlineChars = new[] { '\n', '\r' };
        private static bool linewiseEqual(string a, string b)
        {
            string[] aes = a.Split(newlineChars, StringSplitOptions.RemoveEmptyEntries);
            string[] bes = b.Split(newlineChars, StringSplitOptions.RemoveEmptyEntries);

            if (aes.Length != bes.Length)
                return false;

            for (int i = 0; i < aes.Length; i++)
            {
                if (!string.Equals(aes[i], bes[i]))
                    return false;
            }

            return true;
        }

        private static Task<string> getOutput(ProcessStartInfo start, string source, string target)
        {
            return Task.Factory.StartNew<string>(() =>
            {
                start.WorkingDirectory = WORK_DIR;
                start.RedirectStandardInput = true;
                start.RedirectStandardOutput = true;
                start.UseShellExecute = false;

                var p = Process.Start(start);
                p.StandardInput.WriteLine(source);
                p.StandardInput.WriteLine(target);

                p.WaitForExit();

                return p.StandardOutput.ReadToEnd();
            });
        }

        private static string getRandomWord()
        {
            int length = ran.Next(MAX_LENGTH);
            char[] chars = new char[length];

            for (int i = 0; i < length; i++)
            {
                bool isSpace = ran.Next(SPACE_CHANCE) == 0;
                if (isSpace)
                    chars[i] = ' ';
                else
                    chars[i] = alphaNum[ran.Next(alphaNum.Length)];
            }

            return new string(chars);
        }
    }
}