using FluentFTP;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Security;

namespace EgwProxy.Ftp
{
    /// <summary>
    /// Client per operazioni FTP, basato su FluentFTP: https://github.com/robinrodricks/FluentFTP/wiki/Quick-Start-Example
    /// </summary>
    public class Manager
    {
        #region Public Constructors

        /// <summary>
        /// Inizializzazione di oggetto per comunicazione FTP
        /// </summary>
        /// <param name="server"></param>
        /// <param name="userName"></param>
        /// <param name="passwd"></param>
        /// <param name="rawCert"></param>
        /// <param name="skipCert"></param>
        public Manager(string server, string userName, string passwd, string rawCert, bool skipCert)
        {
            _server = server;
            _userName = userName;
            _passwd = passwd;
            _skipCert = skipCert;
            _rawCert = rawCert;
            if (!string.IsNullOrEmpty(server))
            {
                // se ho user/pwd è autenticato...
                if (!string.IsNullOrEmpty(userName) && !string.IsNullOrEmpty(passwd))
                {
                    client = new FtpClient(server, userName, passwd);
                }
                //.. altrimenti anonimo...
                else
                {
                    client = new FtpClient(server);
                }
            }
        }

        #endregion Public Constructors

        #region Public Methods

        /// <summary>
        /// Creazione directory remota
        /// </summary>
        /// <param name="remoteDir">Nome directory remota da creare (ad es: @"/public_html/videos")</param>
        public bool createDir(string remoteDir)
        {
            tryConnect();
            // upload della folder + files, cancellazione extra files = mirroring
            bool answ = client.CreateDirectory(remoteDir);
            // chiudo!
            client.Disconnect();
            return answ;
        }

        /// <summary>
        /// Eliminazionedirectory remota
        /// </summary>
        /// <param name="remoteDir">Nome directory remota da eliminare</param>
        public bool deleteDir(string remoteDir)
        {
            tryConnect();
            bool answ = false;
            try
            {
                // Elimina folder
                client.DeleteDirectory(remoteDir);
                answ = true;
            }
            catch
            { }
            // chiudo!
            client.Disconnect();
            return answ;
        }

        /// <summary>
        /// Eliminazionedirectory remota
        /// </summary>
        /// <param name="remoteFile">Nome file remoto da eliminare</param>
        public bool deleteFile(string remoteFile)
        {
            tryConnect();
            bool answ = false;
            try
            {
                // Elimina folder
                client.DeleteFile(remoteFile);
                answ = true;
            }
            catch
            { }
            // chiudo!
            client.Disconnect();
            return answ;
        }

        /// <summary>
        /// Verifica esistenza directory su server FTP remoto
        /// </summary>
        /// <param name="remotePath">Percorso remoto da testare (ad es "/htdocs/extras/")</param>
        /// <returns></returns>
        public bool dirExists(string remotePath)
        {
            tryConnect();
            bool answ = client.DirectoryExists(remotePath);
            // chiudo!
            client.Disconnect();
            return answ;
        }

        /// <summary>
        /// Verifica esistenza file su server FTP remoto
        /// </summary>
        /// <param name="remotePath">Percorso remoto da testare (ad es "/htdocs/big2.txt")</param>
        /// <returns></returns>
        public bool fileExists(string remotePath)
        {
            tryConnect();
            bool answ = client.FileExists(remotePath);
            // chiudo!
            client.Disconnect();
            return answ;
        }

        /// <summary>
        /// Scaricamento intera directory, modalità MIRROR
        /// </summary>
        /// <param name="dirPath">Path directory da inviare (ad es:@"C:\website\videos\")</param>
        /// <param name="remoteDir">Nome remoto file per caricamento (ad es: @"/public_html/videos")</param>
        public bool getDir(string dirPath, string remoteDir)
        {
            bool answ = false;
            tryConnect();
            try
            {
                // upload della folder + files, cancellazione extra files = mirroring
                var result = client.DownloadDirectory(dirPath, remoteDir, FtpFolderSyncMode.Mirror);
                answ = (result != null && result.Count > 0);
            }
            catch
            { }
            // chiudo!
            client.Disconnect();
            return answ;
        }

        /// <summary>
        /// Download singolo file
        /// </summary>
        /// <param name="fileName">Path locale del file da inviare (ad es: @"C:\MyVideo.mp4")</param>
        /// <param name="remoteName">NOme remoto file per caricamento (ad es: "/htdocs/MyVideo.mp4")</param>
        public bool getFile(string fileName, string remoteName)
        {
            bool answ = false;
            tryConnect();
            // effettuo caricamento puntuale
            var result = client.DownloadFile(fileName, remoteName);
            answ = result == FtpStatus.Success;
            // chiudo!
            client.Disconnect();
            return answ;
        }

        /// <summary>
        /// Mostra contenuto directory remota
        /// </summary>
        /// <param name="remoteDir">Nome directory remota da leggere (ad es: @"/public_html/videos")</param>
        /// <param name="recurse">Indica se fare search ricorsivo</param>
        public List<string> listDir(string remoteDir, bool recurse)
        {
            tryConnect();
            // upload della folder + files, cancellazione extra files = mirroring
            FtpListItem[] dirContent;
            if (recurse)
            {
                dirContent = client.GetListing(remoteDir, FtpListOption.Recursive);
            }
            else
            {
                dirContent = client.GetListing(remoteDir);
            }
            client.Disconnect();
            var answ = dirContent.Select(x => $"{x.Type} - {x.Name}").ToList();
            // chiudo!
            return answ;
        }

        /// <summary>
        /// Caricamento intera directory, modalità MIRROR
        /// </summary>
        /// <param name="dirPath">Path directory da inviare (ad es:@"C:\website\videos\")</param>
        /// <param name="remoteDir">Nome remoto file per caricamento (ad es: @"/public_html/videos")</param>
        public bool sendDir(string dirPath, string remoteDir)
        {
            bool answ = false;
            tryConnect();
            // upload della folder + files, cancellazione extra files = mirroring
            var result = client.UploadDirectory(dirPath, remoteDir, FtpFolderSyncMode.Mirror);
            answ = (result != null && result.Count > 0);
            // chiudo!
            client.Disconnect();
            return answ;
        }

        /// <summary>
        /// Caricamento singolo file
        /// </summary>
        /// <param name="fileName">Path locale del file da inviare (ad es: @"C:\MyVideo.mp4")</param>
        /// <param name="remoteName">NOme remoto file per caricamento (ad es: "/htdocs/MyVideo.mp4")</param>
        public bool sendFile(string fileName, string remoteName)
        {
            bool answ = false;
            tryConnect();
            // effettuo caricamento puntuale
            var result = client.UploadFile(fileName, remoteName);
            answ = result == FtpStatus.Success;
            // se insuccesso --> controllo se ci sia file...
            if (!answ)
            {
                answ = fileExists(remoteName);
            }
            // chiudo!
            client.Disconnect();
            return answ;
        }

        /// <summary>
        /// Verifica connessione con server FTP remoto
        /// </summary>
        /// <returns></returns>
        public bool serverOk()
        {
            tryConnect();
            bool answ = client.IsConnected;
            // chiudo!
            client.Disconnect();
            return answ;
        }

        /// <summary>
        /// Restituisce tipo server remoto
        /// </summary>
        /// <returns></returns>
        public string serverType()
        {
            tryConnect();
            FtpServer srvType = client.ServerType;
            // chiudo!
            client.Disconnect();
            return $"{srvType}";
        }

        #endregion Public Methods

        #region Protected Fields

        protected bool _skipCert = false;

        #endregion Protected Fields

        #region Protected Properties

        protected string _passwd { get; set; } = "";

        protected string _rawCert { get; set; } = "";
        protected string _server { get; set; } = "";

        protected string _userName { get; set; } = "";

        #endregion Protected Properties

        #region Private Properties

        private FtpClient client { get; set; }

        #endregion Private Properties

        #region Private Methods

        private void Client_ValidateCertificate(FluentFTP.Client.BaseClient.BaseFtpClient control, FtpSslValidationEventArgs e)
        {
            if (e.PolicyErrors == SslPolicyErrors.None || _skipCert || e.Certificate.GetRawCertDataString() == _rawCert)
            {
                e.Accept = true;
            }
            else
            {
                Console.WriteLine($"{e.PolicyErrors}");
                Console.WriteLine($"Cert:{Environment.NewLine}{e.Certificate}");
                Console.WriteLine($"RawString:{Environment.NewLine}{e.Certificate.GetRawCertDataString()}");
                throw new Exception($"{e.PolicyErrors}{Environment.NewLine}{e.Certificate.GetRawCertDataString()}");
            }
        }

        private void tryConnect()
        {
            // connect to the server and automatically detect working FTP settings
            if (!client.IsConnected)
            {
                var profiles = client.AutoDetect();
#if false
                // if any profiles are found, print the code to the console
                if (profiles.Count > 0)
                {
                    var code = profiles[0].ToCode();
                    Console.WriteLine(code);
                }
#endif
                client.ValidateCertificate += Client_ValidateCertificate;
                client.AutoConnect();
            }
        }

        #endregion Private Methods
    }
}