using System;
using Serilog;
using WinSCP;
using System.Collections.Generic;
using System.Linq;
using LCU.Api.Internal.FTPLib.Models;
using LCU.Api.Internal.FTP.Helpers;
namespace LCU.Api.Internal.FTP.Services.FtpOpertionServices;

public class WinScpListDirectoryService : IWinScpListDirectoryService
{
    private const char FileTypeFiles = '-';

    public List<string> GetListOfFilesInDirectory(ListDirectoryRequest listDirectoryRequest)
    {
        try
        {
            var remoteDirectoryInfo = GetRemoteDirectoryInfo(listDirectoryRequest);
            var fileNamesInDirectory = remoteDirectoryInfo.Files.Where(file => file.FileType == FileTypeFiles)
                                            .Select(file => file.Name)
                                            .ToList();
            return fileNamesInDirectory;
        }
        catch (Exception exception)
        {
            Log.Error(exception, $"Failed to get directory list with WinSCP. " +
                                 $"Host: {listDirectoryRequest.SessionInformation.HostName}, " +
                                 $"RemotePath: {listDirectoryRequest.RemotePath}");
            throw;
        }
    }

    public RemoteDirectoryInfo GetRemoteDirectoryInfo(ListDirectoryRequest listDirectoryRequest)
    {
        RemoteDirectoryInfo remoteDirectoryInfo = null;
        try
        {
            var sessionOptions = WinScpSessionOptionsHelper.CreateSessionOptions(listDirectoryRequest.SessionInformation);
            using (var session = new Session())
            {
                session.Open(sessionOptions);
                var transferOptions = new TransferOptions { TransferMode = TransferMode.Binary, PreserveTimestamp = false };
                remoteDirectoryInfo = session.ListDirectory(listDirectoryRequest.RemotePath);
                ArgumentNullException.ThrowIfNull(remoteDirectoryInfo);
            }
           
            return remoteDirectoryInfo;
        }
        catch (Exception exception)
        {
            Log.Error(exception, $"Failed to get directory list with WinSCP. " +
                                 $"Host: {listDirectoryRequest.SessionInformation.HostName}, " +
                                 $"RemotePath: {listDirectoryRequest.RemotePath}");
            throw;
        }
    }    
}