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

namespace EgwControlCenter.Core
{
    public class UpdateMan
    {
        #region Public Fields

        /// <summary>
        /// Init classe
        /// </summary>
        public static UpdateMan obj = new UpdateMan();

        #endregion Public Fields

        #region Public Constructors

        /// <summary>
        /// Init classe
        /// </summary>
        public UpdateMan()
        { }

        /// <summary>
        /// Init classe
        /// </summary>
        /// <param name="user"></param>
        /// <param name="pwd"></param>
        public UpdateMan(string user, string pwd)
        {
            userName = user;
            passwd = pwd;
            doAuth = !string.IsNullOrEmpty($"{userName}{passwd}");
        }

        #endregion Public Constructors

        #region Public Methods

        /// <summary>
        /// Effettua download specifica versione applicativo per install locale
        /// </summary>
        /// <param name="downloadUrl">url del file (tipicamente *.zip) da scaricare</param>
        /// <param name="localDir">Cartella locale x salvataggio file</param>
        /// <param name="packName">Nome applicativo con cui salvare</param>
        /// <param name="version">Versione applicativo (per salvataggio storico versioni)</param>
        public long DownloadApp(string downloadUrl, string localDir, string packName, string version)
        {
            long size = 0;
            // verifico directory
            if (!Directory.Exists(localDir))
            {
                Directory.CreateDirectory(localDir);
            }
            string localFile = "";
            string localLast = "";
            try
            {
                localFile = Path.Combine(localDir, $"{packName}_Build_{version}.zip");
                localLast = Path.Combine(localDir, $"{packName}.zip");
                // scarica file e salva in directory locale...
                using (var http = new HttpClient())
                {
                    if (doAuth)
                    {
                        //client.Credentials = new System.Net.NetworkCredential(userName, passwd);
                        http.DefaultRequestHeaders.Accept.Clear();
                        var byteArray = System.Text.ASCIIEncoding.UTF8.GetBytes($"{userName}:{passwd}");
                        http.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", Convert.ToBase64String(byteArray));
                    }

                    // url da chiamare
                    http.BaseAddress = new Uri(downloadUrl);
                    // lettura
                    var data = http.GetAsync(downloadUrl).Result;
                    using (var myReader = data.Content.ReadAsStreamAsync())
                    {
                        //var myReader = data.Content.ReadAsStreamAsync();
                        if (data.StatusCode != HttpStatusCode.OK)
                        {
                            Log.Info($"Errore in chiamata DownloadApp per URL {downloadUrl}: status code: {data.StatusCode}");
                        }
                        else
                        {
                            using (Stream outStream = File.OpenWrite(localFile))
                            {
                                myReader.Result.CopyTo(outStream);
                            }
                            // ora lo copio come latest...
                            File.Copy(localFile, localLast, true);
                            // recupero dimensione file
                            var thisFile = new FileInfo(localLast);
                            size = thisFile.Length;
                        }
                    }
                }
            }
            catch (Exception exc)
            {
                Log.Error($"Errore in fase di download installers | URL: {downloadUrl}{Environment.NewLine}{exc}");
            }
            return size;
        }

        #endregion Public Methods

        #region Private Fields

        private static Logger Log = LogManager.GetCurrentClassLogger();
        private bool doAuth = false;

        #endregion Private Fields

        #region Private Properties

        private string passwd { get; set; } = "";
        private string userName { get; set; } = "";

        #endregion Private Properties
    }
}