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

namespace FTPLib
{
    public class FtpFileReaderWriter
    {
        private readonly string _serverLocation;
        private readonly string _filename;
        private readonly string _ftpUsername;
        private readonly string _ftpPassword;
        private string _uri;

        public FtpFileReaderWriter(string serverLocation, string filename, string ftpUsername, string ftpPassword)
        {
            _serverLocation = serverLocation;
            _filename = filename;
            _serverLocation = serverLocation;
            _ftpUsername = ftpUsername;
            _ftpPassword = ftpPassword;
            if (_serverLocation.EndsWith("/"))
            {
                _uri = _serverLocation + _filename;
            }
            else
            {
                _uri = _serverLocation + '/' + _filename;
            }
        }

        public void WriteLines(List<string> lines)
        {
                Write(lines);
        }
        public List<string> ReadLines()
        {
                return Read();
        }

        private void Write(List<string> inputs)
        {
            byte[] data = inputs.SelectMany(s => Encoding.UTF8.GetBytes(s + Environment.NewLine)).ToArray();
            var request = (FtpWebRequest)WebRequest.Create(new Uri(_uri));
            request.Method = WebRequestMethods.Ftp.AppendFile;
            request.ContentLength = data.Length;
            request.Credentials = new NetworkCredential(_ftpUsername, _ftpPassword);
            var requestStream = request.GetRequestStream();
            requestStream.Write(data, 0, data.Length);
            requestStream.Close();
            var response = (FtpWebResponse)request.GetResponse();
            Console.WriteLine(response.ToString());
            response.Close();
        }
        private List<string> Read()
        {
            var request = (FtpWebRequest)WebRequest.Create(new Uri(_uri));
            request.Method = WebRequestMethods.Ftp.DownloadFile;
            request.Credentials = new NetworkCredential(_ftpUsername, _ftpPassword);
            var response = (FtpWebResponse)request.GetResponse();
            Stream responseStream = response.GetResponseStream();
            StreamReader reader = new StreamReader(responseStream);
            return reader.ReadToEnd().Split(Environment.NewLine.ToCharArray(), StringSplitOptions.RemoveEmptyEntries).ToList();
        }
    }
}