using System;
using System.Collections.Generic;
using System.IO;
using LCU.API.Collections.RepoApi.Configuration;
using Serilog;
using WinSCP;
using SessionOptions = WinSCP.SessionOptions;
using TransferMode = WinSCP.TransferMode;

namespace LCU.API.Collections.RepoApi.Services.AutoIms
{
    public class AuctionFtpClientService : IAuctionFtpClientService
    {
        private readonly SessionOptions _sessionOptions;
        private readonly RepoApiConfiguration _configuration;

        public AuctionFtpClientService(RepoApiConfiguration configuration)
        {
            _configuration = configuration;
            _sessionOptions = new SessionOptions()
            {
                Protocol = Protocol.Sftp,
                HostName = configuration.FtpConfiguration.HostName,
                UserName = configuration.FtpConfiguration.UserName,
                PortNumber = configuration.FtpConfiguration.Port,
                SshHostKeyFingerprint = configuration.FtpConfiguration.SshHostKeyFingerprint,
                SshPrivateKeyPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory,
                    configuration.FtpConfiguration.SshPrivateKeyPath)
            };
        }

        public Dictionary<FileInfo, string> Download()
        {
            var fileResults = new Dictionary<FileInfo, string>();
            using (Session session = new Session())
            {
                TransferOperationResult transferResult = null;
                try
                {
                    session.ExecutablePath = _configuration.FtpConfiguration.ExecutablePath;
                    session.Open(_sessionOptions);
                }
                catch (WinSCP.SessionLocalException wsle)
                {
                    Log.Error(wsle, "Failed to open FTP session, WINSCP likely missing");
                    return fileResults;
                }
                catch (Exception ex)
                {
                    Log.Error(ex,"Failed to open FTP session");
                    return fileResults;
                }

                TransferOptions transferOptions = new TransferOptions();
                transferOptions.TransferMode = TransferMode.Automatic;
                transferOptions.PreserveTimestamp = true;

                RemoteDirectoryInfo directory = session.ListDirectory(_configuration.RemoteFilePath);

                foreach (RemoteFileInfo fileInfo in directory.Files)
                {
                    string localFileName = Path.Combine(_configuration.LocalDirectoryPath, fileInfo.Name);
                    var remoteFileName = Path.Combine(_configuration.RemoteFilePath, fileInfo.Name);

                    FileInfo thisFileInfo = null;

                    try
                    {
                        if (!fileInfo.IsDirectory && !File.Exists(localFileName))
                        {
                            thisFileInfo = new FileInfo(localFileName);
                            fileResults.Add(thisFileInfo, "success");

                            transferResult = session.GetFiles(remoteFileName, localFileName, true, transferOptions);

                            // Throw on any error
                            transferResult.Check();
                        }
                    }
                    catch (Exception ex)
                    {
                        Log.Error(ex, "Exception while FTP'ing files ");
                        if (thisFileInfo != null)
                        {
                            fileResults[thisFileInfo] = ex.Message;
                        }
                    }
                }
            }

            return fileResults;
        }
    }
}