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

namespace exercise_5
{
    class ReadWriteCSV : ReadWrite
    {
        public new List<string[]> ReadFile(string filename)
        {
            List<string[]> content = new List<string[]>();
            StreamReader reader = File.OpenText(filename);
            string row = "";
            string[] data;
            string[] separatingChars = { ", " };

            //Loop to read the entire text
            while (row!= null)
            {
                row=reader.ReadLine();
                if (row != null && row.Length>0)
                {
                    data = row.Split(separatingChars, System.StringSplitOptions.RemoveEmptyEntries);
                    content.Add(data);
                }
            }
            reader.Close();
            return content;
        }
        public void WriteFile(string filename, List<string[]> data, bool append)
        {
            try
            {
                StreamWriter file = new StreamWriter(filename, append);
                using (file)
                {
                    int count = 0;
                    StringBuilder sb = new StringBuilder();
                    foreach (var group in data)
                    {
                        foreach (var item in group)
                        {
                            if (item.Length > 0)
                            {
                                sb.Append(item);
                            }
                            if (count >= item.Length)
                            {
                                count = 0;
                            }
                            if (count++ <= item.Length)
                            {
                                sb.Append(", ");
                            }
                        }
                        sb.AppendLine();
                        count = 0;
                    }
                    file.WriteLine(sb.ToString());
                }
            }
            catch (Exception e)
            {
                MessageBox.Show((e.ToString()), "There was an error at WriteFile");
            }
            }


    }
}