using System;
using System.IO;

namespace hw2_AM2060
{
    class BrownianMotion
    {
        public static bool outputToFile(string filename, double[] data) {
            StreamWriter sw = new StreamWriter(String.Format(@"C:\Users\Conrad\{0}.csv",filename));
            foreach (double item in data) { sw.Write(item + ","); }
            sw.Close();
            return true;
        }


        public static void generateWalk(double[] data, int n, double T, double sigma)
        {

            double deltat = T / n;
            double Delta = sigma * Math.Sqrt(deltat);
            //Initialising Random seed
            Random rand = new Random();
            //The Bernoulli Trial
            // D represents Delta in this use case, but naming it Delta would be confusing and would cause issues (in that order (: )
           double BernoulliBoi(double D) {
                if (Convert.ToBoolean(rand.Next(2)))
                {
                    return D;
                }
                else { return D * (-1); }
            }
            data[0] = 0;
            for (int i = 0; i < n-1 ; i++)
            {
                data[i+1] = data[i] + BernoulliBoi(Delta);
            }
        }
        static void Main()
        {
            double[] walk = new double[10];
            generateWalk(walk, 10, 10, 2);
            outputToFile("walk", walk);
        }
    }
}